Answer:
[tex]\large \boxed{\text{2.5 L}}[/tex]
Explanation:
1. Calculate the moles of NaOH.
[tex]\text{Moles} = \text{20 g} \times \dfrac{\text{1 mol}}{\text{40 g}} = \text{0.50 mol}[/tex]
2. Calculate the volume of NaOH
[tex]\begin{array}{rcl}\\\text{Molar concentration} &= &\dfrac{\text{moles}}{\text{litres}}\\\\ n &= &\dfrac{c}{V}\\\\\dfrac{\text{0.2 mol}}{\text{1 L}} &=& \dfrac{\text{0.50 mol}}{V}\\\\ \dfrac{0.2V}{\text{1 L}} & = & 0.50\\\\0.2V &= & \text{0.50 L}\\V & = & \dfrac{\text{0.50 L}}{0.2}\\\\& = & \textbf{2.5 L}\\\end{array}\\\text{The volume of the solution is $\large \boxed{\textbf{2.5 L}}$}[/tex]
Answer:
The 0.2M NaOH solution has a volume of 2.5 L
Explanation:
Step 1: Data given
Molarity of a NaOH solution = 0.2 M
Molar mass of NaOH = 40 g/mol
Mass of NaOH = 20.00 grams
Step 2: Calculate moles of NaOH
Moles = mass / molar mass
Moles NaOH = 20.00 grams / 40 g/mol
Moles NaOH = 0.50 moles
Step 3: Calculate volume
Molarity = moles / volume
Volume of solution = moles of NaOH / Molarity
Volume of solution = 0.50 moles / 0.2 M
Volume of solution = 2.5 L
The 0.2M NaOH solution has a volume of 2.5 L
The pyruvic acid from glycolysis can be converted to acetic acid, which can enter the citric acid cycle. Because this process is a cycle, the atoms entering the cycle must balance the atoms that leave. Consider carbon balance in the citric acid cycle. How many CO 2 molecules leave the cycle for each acetic acid molecule that enters? For this question, assume that carbon only enters as acetic acid and exits as CO 2 . Note that acetic acid has two carbon atoms. You can determine the number of carbon atoms in carbon dioxide from its formula, CO 2 .
Answer: 2CO2, 8CO2
Explanation:
During glycolysis one molecule of glucose is oxidized to two molecules of pyruvic acid (3 carbon molecule). Pyruvic acid is converted to acetyl CoA(2 carbon molecule) by the pyruvate dehydrogenase complex.
For each acetic acid that enters the citric acid cycle 2 molecules of CO2 is given off.
For one glucose molecule produces 2 acetyl CoA
2 acetyl groups + 6 NAD+ + 2 FAD + 2 ADP + 2 Pi yields 4 CO2 + 6 NADH + 6 H+ + 2 FADH2 + 2 ATP.
Hence 4 molecules of acetic acid is completely oxidized to 8 molecules of CO2.
Final answer:
Each acetic acid molecule that enters the citric acid cycle results in the release of two CO2 molecules, reflecting the removal of both carbon atoms originally present in the acetic acid.
Explanation:
The student's question pertains to how many molecules of carbon dioxide (CO2) are produced in the citric acid cycle for each acetic acid molecule that enters the cycle. Acetic acid, which becomes part of acetyl-CoA, has two carbon atoms.
During the citric acid cycle, each acetyl group (from the acetyl CoA) will eventually release all of its carbon atoms as CO2. Since each acetic acid molecule contributes two carbon atoms to the cycle, and each turn of the cycle produces two CO2 molecules, it follows that for each acetic acid molecule that enters, two CO2 molecules are released.
These CO2 molecules may not be the same ones that entered most recently, but over successive turns of the cycle, all carbon atoms are accounted for and released as CO2.
What is the molarity (M) of a solution that contains .25 moles of a compound in 1.8 L of solution?
Answer:
The answer to your question is 0.14 M
Explanation:
Data
Molarity = ?
number of moles = 0.25
volume = 1.8 L
Formula
[tex]Molarity = \frac{number of moles}{volume}[/tex]
Substitution
[tex]Molarity = \frac{0.25}{1.8}[/tex]
Simplification and result
Molarity = 0.14 M
Which factor distinguishes a metallic bond from an ionic bond or a covalent bond?
a. the mobility of protons
b. the equal sharing of electrons
c. the unequal sharing of electrons
d. the mobility of electrons
Answer:
d. the mobility of electrons
Explanation:
Covalent bond is the bond which is formed with the sharing of the electrons between the two atoms which are taking place in the bond. It is generally formed between the atoms with similar electronegativity values.
Metallic bond is the bond which is formed by electrostatic attraction force between the positively charged metal ions and the conduction electrons.
Thus, in metallic bond, there is a formation of conduction band and the valence band where the electrons have mobility and have transitions in between them but in covalent bonding, the electrons are shared in the bond and are not mobile.
Answer:
D. the mobility of electrons
What is the approximate rate of descent required (for planning purposes) to maintain the electronic glide slope at 105 knots ground speed?
Answer:
555 ft per min
Explanation:
For the problem above, we can use the IAP chart and the ILS RWY 32 L approach. If we consider an electronic glide slope of 3 degrees, with the table of Rate-of-Descent in the IAP chart. Adjusting the angle of descent to 3 degrees and shifting the ground speed to approximately 105 knots, the estimated rate of descent is 555 ft per min.
To maintain the electronic glide slope at 105 knots ground speed, one would reference standard rates of descent for planning: about 600 fpm for general aviation and 450 fpm for a STOL aircraft with a 7-degree glideslope. These figures can vary depending on specific glide conditions such as aircraft configuration or wind, and precise planning may adjust these rates based on lift, air density, and safety margins.
To find the approximate rate of descent for maintaining the electronic glide slope at 105 knots ground speed, we must consider the standard glide ratio used for planning purposes in aviation. For general aviation, which often uses a power-off approach, a rate of descent of about 600 feet per minute (fpm) is typical, while Short Takeoff or Landing (STOL) aircraft with a steeper 7-degree glideslope might require around 450 fpm.
When determining the time of descent without wind and assuming a steady glide at a constant airspeed and angle, we can employ this information to estimate the time to descend from a certain altitude. For an altitude of 20,000 feet, the accuracy of the time of descent estimation can vary based on the increments and assumptions made in the calculations. When breaking down the glide into increments, smaller increments should provide more accurate results, but as seen in the given example, there's only a small 2% error or two minutes difference between the 'exact' solution and the approximation.
Raymer suggests adjustments to the calculations depending on the usage of thrust reversers or when including a safety margin for commercial aircraft under FAR part 25. These adjustments would affect the range and rate of descent calculations, so in a real-world scenario, they would need to be considered for precise planning.
For our purpose, if the glide is performed under no wind and at optimum conditions for lift over drag (L/D), we simply need the rate of descent to plan the glide slope. However, exact calculations do require the lifting capacity and air density at the altitudes used as increments, as suggested in the context.
Which equation correctly relates the heat of reaction to the standard heats of formation?
∆H° = ∆Hf ° (products) + ∆Hf ° (reactants)
∆H° + ∆Hf ° (products) = ∆Hf ° (reactants)
∆H° = ∆Hf ° (products) – ∆Hf ° (reactants)
∆H° – ∆Hf ° (reactants) = ∆Hf ° (products)
Answer:
D
Explanation:
∆H° = ∆Hf ° (products) – ∆Hf ° (reactants)
Suppose you are titrating an acid of unknown concentration with a standardized base. At the beginning of the titration, you read the base titrant volume as 2.94 mL. After running the titration and reaching the endpoint, you read the base titrant volume as 16.47 mL. What volume of base was required for the titration?
Answer:
The volume of base was required for the titration is 13,53mL
Explanation:
In a titration of an acid (HX) with a base (YOH), the reaction of neutralization is:
HX + YOH → YX + H₂O
In the burette you are adding base until all HX reacts. The addition of base is in volume.
If in the beginnig, the volume that you read of base is 2,94mL and at the endpoint you read a volume of 16,47mL. The volume you spent in the titration that is the same volume of base you required for the titration is:
16,47mL - 2,94mL = 13,53mL
I hope it helps!
To find out the volume of base required for the titration, subtract the initial volume from the final volume. In this case, the calculation would be 16.47 mL - 2.94 mL, which equals 13.53 mL of base.
Explanation:To calculate the volume of the base required for the titration, simply subtract the initial volume of the titrant from the final volume. In this case, we subtract the initial reading of the base titrant volume(2.94 mL) from the final reading after reaching the endpoint (16.47 mL).
So, the calculation would be: 16.47 mL - 2.94 mL = 13.53 mL
Therefore, 13.53 mL of base was required for the titration. This is the volume that was consumed to neutralize the acid to the endpoint.
Learn more about Titration here:https://brainly.com/question/31271061
#SPJ11
Using VSEPR theory, which of these molecules does NOT have a trigonal planar shape?
A) ammonia (NH3)
B) formaldehyde (H2CO)
C) sulfur trioxide (SO3)
D) boron trifluoride (BF3)
Answer:
Ammonia does not have a trigonal shape.
Explanation:
According to VSEPR theory:
Molecules with 3 sigma bonds and no lone pair possess trigonal planar shape irrespective of the number of pi bonds.
Ammonia [tex](NH_3)[/tex] has 3 sigma bonds and one lone pair.Hence its shape is pyramidal due to bond pair - lone pair repulsion.Formaldehyde (HCHO) has 3 sigma bonds and 1 pi bond.Hence it has trigonal planar shape.Sulfur trioxide [tex](SO_3)[/tex] has 3 sigma bonds and 3 pi bonds.Boron triflouride (BF_3) has 3 sigma bonds.Hence except ammonia all other molecules given possess trigonal planar shape.
A valence electron from an arsenic atom might have an electron with the following set of quantum numbers in the ground state.
a. n= 4; L= 1; m1= 0; ms= +½
b. n= 4; L= 1; m1= 2; ms= â½
c. n= 3; L= 1; m1= 0; ms= +½
d. n= 5; L= 1; m1= â1; ms= â½
e. n= 4; L= 2; m1= +1; ms= +½
Answer:A
Explanation:
Arsenic is a p-block non-metal in group 15. It is found in the 4th period with electron configuration [Ar] 3d10 4s2 4p3
The outermost electrons are 4s2 4p3. The quantum number that fits an electron in the 4p orbital is option A
Since n=4,l=1, m= -1,0,1 ms=±1/2
Luis is helping his parents paint a border around the walls of a room. He uses a stencil to repeat the same design on each wall to form one long grapevine with a bunch of grapes every foot along its length. What type of chemical reaction does this best model?
a. replacement.
b. decomposition.
c. polymerization.
d. synthesis.
Answer: c polymerization
Explanation:
Reactions are said to involve the reactants and the products. The type of reaction that involves the repetition of the same pattern over and again is said to be polymerization. Thus, option c is correct.
What is a polymerization reaction?The polymerization reaction is the type of reaction that occurs in the monomer molecules so that three-dimensional polymer chains of the macromolecules can be produced.
This type of reaction is common in carbohydrates where the single unit of sugar (monomer) undergoes changes to form the long chains of polymers by the addition or condensation process.
Luis is using the polymerization reaction as he is using the same stencil to draw over the pattern in a repetitive manner on the wall to make it look like a border or whole sequence.
Therefore, option c. the model best represents the polymerization reaction.
Learn more about polymerization here:
https://brainly.com/question/3611491
#SPJ6
When information-processing theorists use the term hardware, they are often referring to _____a) the brain structures involved in memory.b) the serial position effect.c) the skull that covers and protects the brain.d) the positive bias of memory.
Answer:
A. The brain structures involved in memory
Explanation:
When information-processing theorists use the term hardware, they are often referring to the brain structures involved in memory.
When fuel is burned in a cylinder equipped with a piston, the volume expands from 0.255 L to 1.45 L against an external pressure of 1.02 atm. In addition, 875 J is emitted as heat. What is the DE for the burning of the fuel?
The work done by the system is first calculated to be 121.7J. Then, the change in internal energy (ΔE) is found by summing the heat emitted and the work done, leading to a final ΔE of -753.3J.
Explanation:Given the volume expansion and the external pressure, we can first calculate the work done by the system, using the formula: Work = Pressure * Volume Change. In this case, the volume change is 1.45L - 0.255L = 1.195L. Because the units in this equation need to be in liters and atmospheres, we'll convert 1.195L to atm*L using the conversion 1L*atm = 101.3J. The work done by the system then becomes 1.02 atm * 1.195L * 101.3J/L*atm = 121.7J. The heat emitted by the system (-875J), subtracted by the work done by the system gives us the change in internal energy (ΔE). Therefore, ΔE = q + w = -875J + 121.7J = -753.3J.
Learn more about Change in Internal Energy here:https://brainly.com/question/33537955
#SPJ12
During combustion in the cylinder, the involved energy transfers result in a change in internal energy (ΔE) of the system equal to the sum of the heat lost and the work done by the system. The work (W) is calculated from the external pressure and volume change of the piston, while the heat (Q) is given as 875 J. The change in internal energy is -998.586 Joules.
Explanation:The subject of the question pertains to the calculation of the change in internal energy (ΔE) of a system during the combustion of fuel in a cylinder equipped with a piston. Within this mechanical system, work is done by the expanding gas against an external pressure. Energy transfer takes place: first, energy is converted from potential to kinetic during the combustion process; second, as the piston moves, work is done on the environment; and finally, heat is lost from the system. To calculate ΔE, we should remember the first law of thermodynamics, which states that the change in internal energy of a system (ΔE) is equal to the heat flow into the system (Q) plus the work done by the system (W), or, ΔE = Q + W.
For this question, W is calculated from the external pressure and volume change. Use W = -PΔV (external pressure times the change in volume), keeping in mind that work done by the system is considered negative, as the system is losing energy. So, W = -(1.02 atm)(1.45 L - 0.255 L) = -1.22 atm*L. Converting to Joule, we have W = -1.22 atm*L * 101.3 J/(atm*L) = -123.586 J. For the heat lost by the system, it is given as Q = -875 J (negative because heat is being lost).
Therefore, ΔE = Q + W = -875 J + -123.586 J = -998.586 J.
So, the change in internal energy (ΔE) for the combustion of the fuel in the given system is -998.586 Joules.
Learn more about Energy Transfer in Combustion here:https://brainly.com/question/30000755
#SPJ11
disadvantages of biodegradable plastics
1) The main disadvantage of bio plastics is that when they break down , carbondioxide is released and results into global warming.
2) They are designed to be composted , not recycled.
3) fewer proper composting availability.
4) plants grown for bioplastics have negative impacts of their own.
Final answer:
Biodegradable plastics have several disadvantages including difficulty in breaking down in anaerobic landfill conditions, potential contamination of water resources, challenges in recycling, and threats to wildlife and marine life. These issues highlight the need for better waste management and alternatives to plastic use.
Explanation:
Disadvantages of Biodegradable Plastics
While biodegradable plastics are designed to break down more quickly than conventional plastics, they present several disadvantages. Most commonly-used polymers do not degrade readily, especially under anaerobic conditions of landfills. When decomposition occurs, it may lead to leachates that can contaminate water sources. Another issue is in the recycling industry, which faces challenges due to the vast amount of plastic waste, making it difficult to manage safe incineration and potential landfill overflow. It's also worth noting that plastics recycling has become a major industry confronted with its own problems.
The incessant use of plastics comes with a variety of environmental threats, including air and water pollution from residual or degradation products. More so, plastics endanger wildlife due to animals and marine life mistaking them for food. Despite recycling efforts, plastic water bottles remain problematic due to their wide use and disposal in non-residential areas.
Therefore, the continued use of plastics ought to be reevaluated given the substantial environmental impact, leading to considerations for alternative materials or more robust recycling programs.
Mirrored Conclusion
Every single plastic bottle reaching a landfill symbolizes an environmental footprint that could span centuries in decomposition. As consumers, considering alternatives is essential to mitigate the environmental damage caused by plastic waste.
Which option states the principle behind the law of conservation of mass and the law of conservation of energy?
A) Energy and mass cannot be created or destroyed during physical changes or chemical reactions.
B) Energy and mass are the properties that scientists measure when studying physical changes and chemical reactions.
C) An object's energy and mass have a direct relationship with that object's temperature.
D) An object's energy and mass have an indirect relationship with that object's temperature.
Answer:
A
Explanation:
The law of conservation of mass states that matter can never be created nor destroyed but can be converted from one form to another.
The law of conservation of energy posits that energy cannot be created nor destroyed but can be converted from one form to another.
These laws are the basic laws of existence. Although the laws have been adjusted, they still form the basic principle behind several scientific laws and are responsible for a whole lot of scientific advancements.
While the first law focuses on matter and the content of matter in a body, the second law basically focuses on energy. The second law serves to support the inter convertibility behind the several forms or types of energy.
For example, to do many useful work at home, it is found that energy is converted from its electric form to say heat in an electric iron to press our clothes.
Also, the first law is a fundamental principle useful in the balancing of our chemical equations.
"Professor Offenrokker has a solution that is 6.0 x 10-3 M of HCl of a solution. However, he needs 450 mL of a 6.0 x 10-4 M HCl solution. How much of the stock solution will he need to make the dilute solution?"
Answer : The volume of the stock solution he need to make the dilute solution will be, 45 mL
Explanation :
According to dilution dilution law:
[tex]M_1V_1=M_2V_2[/tex]
where,
[tex]M_1[/tex] = molarity of concentrated solution
[tex]M_2[/tex] = molarity of dilute solution
[tex]V_1[/tex] = volume of concentrated solution
[tex]V_2[/tex] = volume of dilute solution
Given:
[tex]M_1[/tex] = [tex]6.0\times 10^{-3}M[/tex]
[tex]M_2[/tex] = [tex]6.0\times 10^{-4}M[/tex]
[tex]V_1[/tex] = ?
[tex]V_2[/tex] = 450 mL
Now put all the given values in the above formula, we get:
[tex](6.0\times 10^{-3}M)\times V_1=(6.0\times 10^{-4}M)\times 450mL[/tex]
[tex]V_1=45mL[/tex]
Therefore, the volume of the stock solution he need to make the dilute solution will be, 45 mL
[H3O+] [OH−] pH Acidic or Basic 3.5×10−3 _____ _____ _____ _____ 3.8×10−7 _____ _____ 1.8×10−9 _____ _____ _____ _____ _____ 7.15 _____[H3O+] [OH−] pH Acidic or Basic 3.5×10−3 _____ _____ _____ _____ 3.8×10−7 _____ _____ 1.8×10−9 _____ _____ _____ _____ _____ 7.15 _____
Answer:
See explanation below
Explanation:
I'm assuming this is a table you need to complete, so, you are not putting this in order, but I already found it in another place. let's do a little summary of the expressions we need to use in order to complete the chart.
To calculate pH we need the following expression:
pH = -log[H3O+] (1)
From this expression we can solve for [H3O+] in case we need it:
[H3O+] = 10^(-pH) (2)
When we have [OH-] we calculate the pOH and from there, the pH:
pOH = -log[OH-] (3)
and [OH-]:
[OH-] = 10^(-pOH) (4)
Finally to get the pH from pOH:
14 = pH + pOH
pH = 14 - pOH (5)
With these 5 expressions we can complete the chart. In picture 1, you have the actual chart.
To know if it's acidic or basic, that depends on the value of pH.
If pH <7 it's acidic
If pH >7 it's basic
If pH = 7 it's neutral
First case:
[H3O+] = 3.5x10^-3
pH = -log(3.5x10^-3) = 2.46 (acidic)
pOH = 14 - 2.46 = 11.54
[OH-] = 10^(-11.54) = 2.88x10^-12 M
Second case:
pOH = -log(3.8x10^-7) = 6.42
pH = 14 - 6.42 = 7.58 (it's basic)
[H3O+] = 10^(-7.58) = 2.63x10^-8 M
Third case:
pH = -log(1.8x10^-9) = 8.74 (it's basic)
pOH = 14 - 8.74 = 5.26
[OH-] = 10^(-5.26) = 5.5x10^-6 M
Fourth case:
[H3O+] = 10^(-7.15) =7.08x10^-8 M (Basic)
pOH = 14 - 7.15 = 6.85
[OH-] = 10^(-6.85) = 1.41x10^-7 M
Hope this can help you
To determine the missing pH values and whether the solutions are acidic or basic, apply the pH calculation formula and compare the resulting pH to 7. Solutions with a pH less than 7 are acidic, and those with a pH greater than 7 are basic.
Explanation:The student has provided various concentrations of hydronium ([H3O+]) and hydroxide ([OH-]) ions and is looking to complete the table with the missing values for pH and whether the solution is acidic or basic. To find the pH, use the formula: pH = -log[H3O+]. If the resulting pH is less than 7, the solution is acidic, and if it's greater than 7, the solution is basic. A solution is neutral if its pH is exactly 7.
Using this information, for a solution with [H3O+] = 3.5×10⁻³ M, calculate the pH and determine the acidity. Similarly, for [H3O+] = 3.8×10⁻⁷ M and [H3O+] = 1.8×10⁻⁹ M, calculate their pHs. The solution is considered acidic if [H3O+] > 1×10⁻⁷ M. For pH = 7.15, the solution is slightly basic because the pH is greater than 7.
____________________ ____________________ contain an oil-like substance called bitumen
Answer:
Tar sands.
Explanation:
Tar sands also called as oil sands, it is defined as the mixture of mostly clay, water, tar sand, and a molasses like substances known as bitumen. Bitumen is composed of hydrocarbons in liquid oil in same molecules, and it is mainly used for produce gasoline, and other petroleum products.
Extracting bitumen is significantly more difficult, and costlier compared to other extracting refining liquid oil. Common extraction method of bitumen includes surface mining.
How many Cl- ions are there in 400.5 grams of AlCl3?
A. 9.000 ions
B. 1.500 X 10^-23 ions
C. 1.810 X 10^24 ions
D. 5.420 X 10^24 ions
Answer:
The answer to your question is letter A
Explanation:
Process
1.- Calculate the molecular mass of AlCl₃
Al = 1 x 27 = 27
Cl = 3 x 35.5 = 106.5
AlCl₃ = 27 + 106.5 = 133.5
2.- Find the number of ions of Cl using proportions
133.5 grams of AlCl₃ ------------- 3 ions of Chlorine
400.5 grams of AlCl₃ ------------ x
x = (400.5 x 3) / 133.5
x = 9
Answer:
d
Explanation:
the answer is d because when you solve it's d
Match the following vocabulary words with their definitions.
precipitation, condensation, transpiration, dew, evaporation
1. Process by which water vapor changes into liquid water
2. Process by which liquid water changes into water vapor
3. Moisture falling from the clouds as snow, rain, or hail
4. The process by which plants give off water vapor
5. Moisture collecting on cool surfaces
Answer:
1. Process by which water vapor changes into liquid water - condensation
2. Process by which liquid water changes into water vapor - evaporation
3. Moisture falling from the clouds as snow, rain, or hail - precipitation
4. The process by which plants give off water vapor - transpiration
5. Moisture collecting on cool surfaces - dew
Explanation:
Process by which water vapor changes into liquid water is condensation. Process by which liquid water changes into water vapor is evaporation Moisture falling from the clouds as snow, rain, or hail is precipitation.The process by which plants give off water vapor is transpiration. Moisture collecting on cool surfaces is dew .
What is precipitation?Precipitation is defined as any liquid or frozen water which forms in the atmosphere and then gets received on Earth.It is one of the most important steps of the water cycle.
Precipitation takes place in form of clouds when water vapor gets accumulated in clouds and they get bigger and heavy, when the clouds become heavy enough they fall to the land in the form of rain,if a cloud is present at higher altitudes , the water present in the clouds freezes and fall to the ground in form of snow,hail.
Precipitation occurs always in case of fresh water because the sea salt does not evaporate with the water.The different types of precipitation are rain, drizzle,snow,snow hail,etc.
Learn more about precipitation,here:
https://brainly.com/question/20925010
#SPJ5
The diphosphate ion is a biologically important polyatomic ion. If the ionic compound calcium diphosphate has the formula Ca2P2O7, which correctly represents the ion symbol of the diphosphate ion?
Answer:
The symbols of the diphosphate ion is P₂O₇⁴⁻
Explanation:
The compound Ca₂P₂O₇ is known as Calcium pyrophosphate. for the compound to be formed, two ions are put together. The cation Ca²⁺ and the anion P₂O₇⁴⁻. The oxidation state of calcium is always +2. The anion has to have a charge of -4 to make the formula Ca₂P₂O₇.
symbol Ca P₂O₇
oxidation state +2 -4
valency 2 4
Crossing the valency and finding the ratio of the valency after crossing
= Ca₄ (P₂O₇)₂
= Ca₂P₂O₇
Which of the following are organic compounds?
Select all that apply.
ozone (O3)
propane (C3H8)
methane (CH4)
water (H2O)
Answer:
Propane and methane
Explanation:
The organic compounds are the one that has Carbon (C) as its principal component. Most organic compounds are made up of carbon, hydrogen and oxygen atoms, often combined with others such as nitrogen, phosphorus or sulfur .
Which of the following molecules has an angular (bent) geometry that is commonly represented as a resonance hybrid of two or more electron-dot structures?
(A) CO2
(B) O3
(C) CH4
(D) BeF2
(E) OF2
Answer:B
Explanation:
Below is attached an image of ozone and the resonance structures. Ozone is an angular (Bent) molecule as seen in the image below. It is best described by resonance structures as shown.
From the options, the molecule that has an angular geometry and is commonly represented as a resonance hybrid is : ( B ) O₃
The Ozone gas is a reactive gas that is formed by the bonding of three oxygen atoms. it occurs in the atmosphere as man-made or natural gas. its geometry is angular as it is a resonance that represents the two or more electron dot structures ( combination of three oxygen atoms ).
Hence we can conclude that the molecule from the options above that has an angular geometry is the Ozone gas ( O₃ ).
Learn more : https://brainly.com/question/23186907
Which of the following happens in hydrogenation? Question 9 options: A) Hydrogen atoms are added to fats to make them more saturated. B) Cholesterol is extracted from a product. C) Fats are made less saturated by removing hydrogen atoms. D) A saturated fat becomes a polyunsaturated fat. E) A solid fat becomes a liquid fat.
Answer : The correct option is, (A) Hydrogen atoms are added to fats to make them more saturated.
Explanation :
Hydrogenation : Hydrogenation means to treat with hydrogen that means it is a chemical reaction between the molecular hydrogen and the another compound or an element in the presence of catalyst like, nickel, palladium etc.
When an organic compound is hydrogenated then it becomes more saturated with the hydrogen atoms.
The largest scale application of hydrogenation is the processing of vegetable oils. Typically, vegetable oils are derived from polyunsaturated fatty acids. Their partial hydrogenation reduces most but not all of these carbon-carbon double bonds.
Liquid fats : They have the highest degree of unsaturation. Vegetable and marine oils are liquid fats.
Solid fats : They are highly saturated. Vegetable and animal fats are solid fats.
Hence, the correct option is, (A) Hydrogen atoms are added to fats to make them more saturated.
A colorless solution is known to contain one of these ions. Which ion is present if adding dilute HCl produces a white precipitate that dissolves when the solution is warmed?
(A) Ag+
(B) Cu2+
(C) Hg22+(D) Pb2+
Answer:
The correct answer is option D.
Explanation:
All the cations given belong to the group-1 cation and will give precipitate of their respective chlorides when HCl is added to their aqueous solution.
[tex]Ag^+(aq)+HCl(aq)\rightarrow AgCl(s)+H^+(aq)[/tex]
[tex]Cu^{2+}+(aq)+2HCl(aq)\rightarrow CuCl_2(s)+2H^+(aq)[/tex]
[tex]Hg_{2}^{2+}+(aq)+2HCl(aq)\rightarrow Hg_2Cl_2(s)+2H^+(aq)[/tex]
[tex]Pb^{2+}+(aq)+2HCl(aq)\rightarrow PbCl_2(s)+2H^+(aq)[/tex]
All the precipitates are insoluble in cold water but out of all these only lead(II) chloride is soluble in warm water.
The ion present in a solution that forms a white precipitate upon the addition of dilute HCl and dissolves when warmed is Pb2+ because PbCl2 is more soluble in hot water. So the correct option is D.
Explanation:When determining which ion is present in a solution that produces a white precipitate upon the addition of dilute HCl and then dissolves upon warming, we need to consider the solubility properties of the possible ions' chlorides. Ag+, Pb2+, and Hg2_2+ are all known to form insoluble chlorides. However, the key information here is that the white precipitate dissolves when warmed. This is characteristic of PbCl2, which is more soluble in hot water than the chlorides of silver or mercury. Therefore, the ion that produces a white precipitate is Pb2+, and the precipitate is lead(II) chloride, also referred to as PbCl2.
Learn more about PbCl2 here:https://brainly.com/question/33167588
#SPJ3
Two sources of copper are cuprite, which has the IUPAC name copper(I) oxide, and malachite, which has the formula Cu2CO3(OH)2. Copper is used in home wiring and electric motors because it has good electrical conductivity. Other uses of copper not related to its electrical conductivity include coins, plumbing, roofing, and cooking pans.Aluminum is also used for cooking pans. At room temperature, the electrical conductivity of a copper wire is 1.6 times greater than an aluminum wire with the same length and cross-sectional area. At room temperature, the heat conductivity of copper is 1.8 times greater than the heat conductivity of aluminum. At STP, the density of copper is 3.3 times greater than the density of aluminum. Identify one physical property of aluminum that could make it a better choice than copper for a cooking pan.
Answer:
See explanation below
Explanation:
This is a four part question, however, I will answer only the question you are asking which is, the property of aluminum that could make a better choice over than copper for a cooking pan.
As it was stated in the question, Copper has a higher density than the aluminum, therefore, copper would weight more than aluminum, making more difficult to manage. Aluminum then, has less mass than copper, and this is more effective and comfortable to use rather than a copper pan, that weight more and it could be very noisy to manage, than an aluminum pan with the same size.
If density of copper is 3.3 times greater, means that the mass of copper is also 3.3 times greater, therefore, if an aluminum pan weights about 400 g, a copper pan will weight more than 1.2 kg, and that's more difficult to manage and for the use.
Which is a cationic detergent having four organic groups attached to a nitrogen atom and used to sanitize utensils? Select one:
a. Propionic acid
b. Quaternary ammonium compound
c. Ethylene oxide
d. Methylene blue
Answer:B
Explanation:
A quaternary ammonium compound contains a nitrogen atom to which four atoms or groups are attached leaving a positive charge on the nitrogen. This compound is now cationic in nature and can be used as a cationic detergent.
Which set of chemical name and chemical formula for the same compound is correct?A. Ammonium sulfite, (NH4)2SB. Iron(III) Phosphate, FePO4C. Lithium Carbonate, LiCO3D. Magnesium Dichromate, MgCrO4
Answer : The correct option is, Iron(III) phosphate, [tex]FePO_4[/tex].
Explanation :
Ionic compound : It is defined as the compound which is formed when electron gets transferred from one atom to another atom.
All the polyatomic ions always form an ionic compound.
Polyatomic ions : It is a charged species that composed of two or more atoms and these charged species are bonded by the covalent bond.
(1) The chemical formula for Ammonium sulfite.
The given compound ammonium sulfate is an ionic compound. It is made up of two different ions which are ammonium ion [tex](NH_4^+)[/tex] and sulfite ion [tex](SO_3^{2-})[/tex] by the criss-cross method. Thus, the correct chemical formula for ammonium sulfite is [tex](NH_4)_2SO_3[/tex].
(2) The chemical formula for Iron(III) phosphate.
The given compound iron(III) phosphate is an ionic compound. It is made up of two different ions which are iron ion [tex](Fe^{3+})[/tex] and phosphate ion [tex](PO_4^{3-})[/tex] by the criss-cross method. Thus, the correct chemical formula for iron(III) phosphate is [tex]FePO_4[/tex].
(3) The chemical formula for Lithium carbonate.
The given compound lithium carbonate is an ionic compound. It is made up of two different ions which are lithium ion [tex](Li^+)[/tex] and carbonate ion [tex](CO_3^{2-})[/tex] by the criss-cross method. Thus, the correct chemical formula for lithium carbonate is [tex]Li_2CO_3[/tex].
(4) The chemical formula for Magnesium dichromate.
The given compound magnesium dichromate is an ionic compound. It is made up of two different ions which are magnesium ion [tex](Mg^{2+})[/tex] and dichromate ion [tex](Cr_2O_7^{2-})[/tex] by the criss-cross method. Thus, the correct chemical formula for magnesium dichromate is [tex]MgCr_2O_7[/tex].
From this we conclude that, the correct set of chemical name and chemical formula for the same compound is Iron(III) phosphate.
Hence, the correct option is, Iron(III) phosphate, [tex]FePO_4[/tex].
Answer: B. iron(III) phosphate, FePO4
Explanation:
Which of the following would be considered the most hazardous condition onboard a vessel
Answer: the most hazardous condition onboard a vessel is not having enough life jackets.
Explanation: a life jacket is a piece of equipment designed to assist a wearer to keep afloat in water in the event of an emergency and are considered life-saving equipment.
Which of the following criteria are used to determine if a substance is a neurotransmitter? I. The chemical must be synthesized in the neuron. II. When the neuron is active, the chemical is released and produces a response. III. Injection of the chemical mimics the effects of neuronal stimulation. IV. Mechanisms exist for the removal of the chemical.
Answer:
Explanation:
All of them. Dopamine is a neurotransmitter.
1. Dopamine is synthesized in the neuron by hydroxylating L-tyrosine via Tyrosine Kinase pathway.
2. Dopamine activates neuronal brain function.
3. Injection of L-DOPA mimics the dopamine and effects the same as neuronal stimulation.
4. Dopamine is converted to Adrenaline/Noradrenaline by Kinases and further removed from Kidneys by glucronidation.
The pressure in car tires is often measured in pounds per square inch (lb/in.2), with the recommended pressure being in the range of 25 to 45 lb/in.2. Suppose a tire has a pressure of 36.0 lb/in.2 . Convert 36.0 lb/in.2 to its equivalent in atmospheres. Express the pressure numerically in atmospheres.
To convert pressure from lb/in^2 to atmospheres, you divide the pressure in lb/in^2 by 14.7 (1 atm). Therefore, 36.0 lb/in^2 is approximately equivalent to 2.45 atmospheres.
Explanation:
The pressure of 36.0 lb/in^2, often used in car tires, can be converted into equivalents in atmospheres (atm) using known conversion factors. First, we know that 1 atmosphere is equivalent to 14.7 psi (pounds per square inch), which is a measure of pressure. Therefore, to convert the pressure of 36.0 lb/in^2 into atmospheres, you just divide the PSI by 14.7. So, 36.0 lb/in^2 divided by 14.7 (which represents 1 atm) equals approximately 2.45 atm. Thus, 36.0 lb/in^2 is equivalent to approximately 2.45 atmospheres.
Learn more about Pressure Conversion here:https://brainly.com/question/13969823
#SPJ3
Rank the following substances in order from most soluble in water to least soluble in water: methane, CH4; 2-butanol, C4H9OH; magnesium chloride, MgCl2; and propane, C3H8.
Answer: The given substances are placed in order from most soluble in water to least soluble in water as follows.
[tex]MgCl_{2}[/tex] > [tex]C_{4}H_{9}OH[/tex] > [tex]C_{3}H_{8}[/tex] > [tex]CH_{4}[/tex]
Explanation:
It is known that like dissolves like which means a polar compound will be soluble in a polar solvent. And, a non-polar compound will be soluble in non-polar solvent.
Ionic compounds are soluble in polar solvent like water. For example, [tex]MgCl_{2}[/tex] is an ionic compound and it is readily soluble in water.
2-butanol ([tex]C_{4}H_{9}OH[/tex]) is also a polar compound and it will also dissolve in water but to a lesser extent as compared to magnesium chloride.
Whereas both methane and propane are non-polar in nature. But as propane is larger in size as compared to methane so, it will be slightly more soluble in water as compared to methane.
Thus, we can conclude that the given substances are placed in order from most soluble in water to least soluble in water as follows.
[tex]MgCl_{2}[/tex] > [tex]C_{4}H_{9}OH[/tex] > [tex]C_{3}H_{8}[/tex] > [tex]CH_{4}[/tex]
The substances, ranked from most to least soluble in water, are magnesium chloride (MgCl2), 2-butanol (C4H9OH), methane (CH4), and propane (C3H8). This is based on their ability to form hydrogen bonds with water.
Explanation:The solubility of substances in water primarily depends on whether or not the substance can form hydrogen bonds with water. More the ability to form hydrogen bonds, greater the solubility in water.
So, magnesium chloride MgCl2, an ionic compound, will be the most soluble. It dissolves in water by breaking apart into individual ions which are then surrounded by water molecules. Next would be 2-butanol, C4H9OH, a polar molecule with an -OH group that can form hydrogen bonds with water. The last two, methane, CH4, and propane, C3H8, are nonpolar and thus less soluble in water. Methane is slightly more soluble than propane due to its smaller size.
Learn more about Solubility here:https://brainly.com/question/31493083
#SPJ3