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Why does the sun appear to move from east to west across the sky? A. Due to Earth's revolution B. Due to Earth's rotation C. Due to the sun's revolution D. Due to the sun's rotation
B. Due to Earth's rotation
In each case tell which sn2 reaction will proceed faster. 1. the displacement on 2-bromopropane by (a) ch3ch2o- or (b) cn-. 2. the displacement by oh- on (a) h2c=chbr or (b) h2c=chch2br. submit answertry another version2 item attempts remaining
The displacement on 2-bromopropane will likely proceed faster with CH3CH2O- because of the degree of nucleophilicity; this group is likely more nucleophilic than a CN group, as even though the triple bond would make it more reactive it is still relying heavily on the effects of induction in justifying its reactivity.
The displacement for number 2 would occur SIGNIFICANTLY quicker on the H2C=CHCH2Br due to its position. The alternative has Bromine in a vinylic position to the double bond making an SN2 reaction nearly impossible (sp2 hybridized centers don’t react well with SN2 and have a poor intermediate while allylic SN2s are stabilized by resonance).
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Where does electromagnetic radiation come from
Electromagnetic radiation is made when an atom absorbs energy.
When does a real gas behave like an ideal gas?
At high temperatures and low pressures
Explanation:
Real gas-)
Gases which does not obey ideal gas equation at all temperature and pressure are generally known as real gases.
ex- all gases are real .
Ideal gas ;-)
GasesThe gases which obey ideal gas equation at all conditions of temperature and pressure are generally known as ideal gases.
£] No gas is purely ideal
*--» Real gases can behave as ideal gas at low pressure and high temperature.
----» explain deviation of real gases, we can use compressibility factor[Z]with the use of ideal gas equation
In an exothermic reaction, the water will _______ in a calorimeter. A. release heat B. drop in temperature C. drop in volume D. absorb heat
the correct answer is D, absorb heat
I think the answer is A because exo means release
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How does an atom develop a positive charge
Answer choices?? Please
An atom that gains a negative electron, it becomes a negative ion. If it loses an electron it becomes a positive ion. ... It now has more positive protons than electrons so it has an overall positive charge. Therefore it is a positive ion.
He splitting of the uranium atom is an example of ________. the splitting of the uranium atom is an example of ________. radioactive merge half life radioactive cleavage nuclear fusion nuclear fission
The splitting of an atom is known as nuclear fission, in which a high-energy particle is introduced to a heavy atom to instigate the separation; heavy atoms are known to be naturally unstable due to their size, and a small catalyst is enough to tip the system in favor of splitting. The act of fission usually produces two daughter nuclei and some byproduct, such as an alpha or beta particle, etc.
The splitting of the uranium atom is an example of nuclear fission. Radioactive merge half life radioactive cleavage is nuclear fission.
What is nuclear fission and nuclear fusion ?Fusion is the process where two light nuclei fuse together to release enormous quantities of energy, while fission is the breaking of a heavy, unstable nucleus into two lighter nuclei. Despite their differences, the two methods are crucial to the creation of energy in the past, present, and future.
By dissolving large, heavy atoms, like uranium, into smaller ones, like iodine, cesium, strontium, xenon, and barium, to name just a few, fission produces energy. However, fusion involves joining light atoms, such as the deuterium and tritium isotopes of hydrogen, to create the heavier helium.
Hence, the splitting of the uranium atom is an example of nuclear fission.
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The copper and aluminum electrodes are connected in a battery.
a.which is the anode?
b.which is oxidized?
c.what will the battery voltage be?
d.write a balanced net ionic equation for the reaction that takes place.
a. Which is the anode?
Al is more reactive than the Cu, because the reduction potential of Al is -1.676 V, so would turn to ions easily hence it would give electrons and form a cation and so it will be the anode.
b. Which is oxidized?
Copper is the cathode, because of its reduction potential +0.34 V, which has a higher affinity for electrons and so it will be the oxidizing agent which means the Al is oxidized.
c. What will the battery voltage be?
The voltage of the battery we can be calculated by using the reduction potentials of both elements:
E°battery = E°cathode - E°anode = E°Cu - E°Al = 0.34 - (-1.676) = 2.016 V
The cell have a spontaneous reaction because the voltage has a positive sign.
d. Write a balanced net ionic equation for the reaction that takes place.
Al + 3 Cu⁺ ----> Al³⁺ + 3 Cu
The pressure of a gas is reduced from 1200.0 mmHg to 850.0 mmHg as the temperature of its container is increased from 90.0 c to 785.75 c. What would be the final volume be if the original volume was 85.0 mL ?
Even tho I gotta get to be the first
The four following concentrated solutions are each diluted with water to form 200 mL of a dilute solution. Which solution, once diluted to 200 mL, will have the largest concentration? View Available Hint(s) The four following concentrated solutions are each diluted with water to form 200 mL of a dilute solution. Which solution, once diluted to 200 mL, will have the largest concentration? 100.0 mL of a 0.1 M NaOH solution 20.0 mL of a 0.4 M NaOH solution 80.0 mL of a 0.2 M NaOH solution. 10.0 mL of a 0.5 M NaOH solution
Answer:
80.0 mL of a 0.2 M NaOH solution.
Explanation:
To solve this problem, we must mention that the no. of millimoles of the substance is equal before and after dilution.(MV)before dilution = (MV)after dilution.
We need to calculate the concentration after the dilution for each solution:
100.0 mL of a 0.1 M NaOH solution:M after dilution = (MV)before dilution/V after dilution = (0.1 M)(100.0 mL)/(200.0 mL) = 0.05 M.
20.0 mL of a 0.4 M NaOH solution:M after dilution = (MV)before dilution/V after dilution = (0.4 M)(20.0 mL)/(200.0 mL) = 0.04 M.
80.0 mL of a 0.2 M NaOH solution:M after dilution = (MV)before dilution/V after dilution = (0.2 M)(80.0 mL)/(200.0 mL) = 0.08 M.
10.0 mL of a 0.5 M NaOH solution:M after dilution = (MV)before dilution/V after dilution = (0.5 M)(10.0 mL)/(200.0 mL) = 0.025 M.
So, 80.0 mL of a 0.2 M NaOH solution will have the largest concentration after dilution to 200.0 mL.
Among the given options, the 80 mL solution of 0.2 M NaOH will have the highest concentration after being diluted to 200 mL, as it has the greatest number of moles of NaOH initially.
Explanation:The subject of this question is the concentration of a diluted solution. In this particular case, we have four solutions of sodium hydroxide (NaOH) that have different initial concentrations and volumes, and they are diluted to make 200 mL solutions. To determine which solution will have the largest concentration after dilution, we use the dilution formula: M1V1 = M2V2, where M1 and V1 are the molarity and volume of the initial solution, and M2 and V2 are the molarity and volume of the diluted solution.
Applying this formula to each of the four solutions, we have: 0.1 M * 100 mL = 0.01 mol, 0.4 M * 20 mL = 0.008 mol, 0.2 M * 80 mL = 0.016 mol, and 0.5 M * 10 mL = 0.005 mol for the NaOH solutions respectively. Since the concentration after dilution is given by the number of moles divided by the volume (which is uniform at 200 mL), the solution with the greatest number of moles will have the greatest concentration. Therefore, the 80 mL solution of 0.2 M NaOH will have the highest concentration after dilution.
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Which type of galaxy has a central bar of stars instead of a rounded core? A. spiral B. irregular C. elliptical D. barred spiral
the answer is D. Barred Spiral
Suppose that 25 g of each substance is initially at 27.0 °c. what is the final temperature of each substance upon absorbing 2.35 kj of heat?
a. gold
b. silver
Answer:
a. gold : 755.7°C.
b. silver: 418.7°C.
Explanation:
a. gold :
It is known that:The amount of heat absorbed by gold = Q = m.c.ΔT.
where, m is the mass of Au (m = 25.0 g).
c is the specific heat capacity of Au = 0.129 J/g°C.
ΔT is the temperature difference = (final T - 27.0°C).
Q = 2.35 kJ = 2350.0 J.
∴ The amount of heat absorbed by Au = Q = m.c.ΔT = 2350.0 J.
∴ 2350.0 J = (25.0 g)(0.129 J/g°C)(final T - 27.0°C).
∴ 2350.0 J = 3.225 final T - 87.08.
∴ 3.225 final T = 2350.0 + 87.08 = 2473.
∴ final T = 2473/3.225 = 755.7°C.
b. silver:
It is known that:The amount of heat absorbed by silver = Q = m.c.ΔT.
where, m is the mass of Ag (m = 25.0 g).
c is the specific heat capacity of Ag = 0.24 J/g°C.
ΔT is the temperature difference = (final T - 27.0°C).
Q = 2.35 kJ = 2350.0 J.
∴ The amount of heat absorbed by Ag = Q = m.c.ΔT = 2350.0 J.
∴ 2350.0 J = (25.0 g)(0.24 J/g°C)(final T - 27.0°C).
∴ 2350.0 J = 6.0 final T - 162.0.
∴ 6.0 final T = 2350.0 + 162.0 = 2512.
∴ final T = 2512/6.0 = 418.7°C.
The final temperature of the gold when it absorbs the heat is 755.68 ⁰C.
The final temperature of the silver when it absorbs the heat is 418.67 ⁰C.
The given parameters;
mass of each substance = 25 ginitial temperature of each substance = 27 ⁰Cspecific heat capacity of gold, = 0.129 J/ g⁰Cspecific heat capacity of silver, 0.24 J/ g⁰CThe final temperature of the gold when it absorbs 2,350 J;
Q = mcΔt
[tex]2350 = 25 \times 0.129 \times (t- 27)\\\\2350 = 3.225t - 87.075\\\\3.225t = 2437.075 \\\\t = \frac{2437.075}{3.225} \\\\t = 755.68 \ ^0c[/tex]
The final temperature of the silver when it absorbs 2,350 J;
Q = mcΔt
[tex]2350 = 25 \times 0.24 \times (t -27)\\\\2350 = 6t - 162\\\\6t = 2350 + 162\\\\6t = 2512\\\\t = \frac{2512}{6} \\\\t = \frac{2512}{6} \\\\t = 418.67 \ ^0C[/tex]
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What is temperature
Temperature is a degree of hotness or coldness the can be measured using a thermometer.Temperature is measured in degrees on the Fahrenheit, Celsius, and Kelvin scales. It's also a measure of how fast the atoms and molecules of a substance are moving.
Calculate the approximate volume of a 0.600 mol sample of gas at 15.0°C and a pressure of 1.10?12.9 L 24.6 L 22.4 L 129 L
A 12.9 L
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There are several aromatic compounds with the formula c8h9cl. draw those that have a disubstituted ring where the chlorine is not attached to the ring.
The skeletal formulas of the desired ones are drawn.
The two aromatic compounds with the formula C₈H₉Cl are 1-Chloro-2-ethylbenzene and 1-Chloro-3-methylbenzene.
1.
1-Chloro-2-ethylbenzene: In this structure, the chlorine atom (Cl) is attached to the second carbon atom of the ethyl group, which is connected to the aromatic benzene ring.
2.
1-Chloro-3-methylbenzene: In 1-Chloro-3-methylbenzene, the chlorine atom (Cl) is attached to the third carbon atom of the methyl group, which is connected to the aromatic benzene ring. The structure consists of a benzene ring (six carbon atoms in a hexagonal arrangement) with a methyl group attached to the third carbon atom of the ring.
In both cases, the chlorine atom (Cl) is not directly attached to the aromatic ring but is instead attached to a carbon atom that is connected to the ring.
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Which of the following counteracts the movement of bicarbonate ions from the RBC?
A) chloride shifting
B) the Haldane effect
C) release of hydrogen ion
D) the Bohr effect
Answer:
A) chloride shifting
Explanation:
Chloride shifting involves the exchange of bicarbonate (HCO3-) and chloride ions (Cl-) across the red blood cells membrane.Most carbon dioxide in the body is transported in the form of bicarbonate in the blood. As the blood flows in the tissues, carbon dioxide gas diffuses into the red blood cells and is converted to bicarbonate.The transport of bicarbonates into the red blood cells is in exchange for chloride ions. Which is referred to as chloride shifting.What weight of oxalic acid dihydate must be measured to prepare 1 litre of 0.01 oxalic acid solution
The weight of oxegon
Predict whether each of the following molecules is polar or non-polar:a) IF,b) CS2, c) SO3, d) PCl3, e) SF6, f) IF5.
Polar: IF, PCl3, IF5
Nonpolar: CS2, SO3, SF6
Explanation:Polar molecules form when two atoms do not share electrons equally in a covalent bond. A molecule is classified as a polar molecule when the arrangement of the atoms is such that one end of the molecule has a positive electrical charge and the other end has a negative charge. A non-polar molecule does not have electrical poles.The electrons are distributed more equally. Therefore, a non-polar molecule does not have a profusion of charges at the opposite ends. The majority of hydrocarbon liquids are non-polar molecules. Question 33 Saved
Volcanic rock has often been found early in the rock record but less frequently in later rock layers. What does this suggest to scientists about early earth?
Question 33 options:
1)
Volcanic activity is the same today as it was early in Earth's history.
2)
Volcanic rock is more easily preserved than other kinds of rock.
3)
Volcanic activity was more common in the past than it is today.
4)
Volcanic rock is easier to find.
Answer:
The third option
Explanation:
If people have found more volcanic rock layers in the past that would mean that volcanic activity was more common in the past.
Compare the amount of thermal energy needed to melt a solid and the amount of thermal energy needed to freeze the same liquid
To melt a solid, energy must be input into the solid to give the molecules high energy to disrupt the lattice bonds and change phase. To return the liquid to solid, the same amount of energy used in melting is required to be removed from the liquid, ideally. This is assuming there is no loss of energy in the process.
Answer:
They have the same magnitude but differ on the sign.
Explanation:
Hello,
Melting enthalpy is related with the necessary energy a solid sample needs to be converted to liquid; in general, such energy is positive as the initial solid needs to gain energy to become liquid as liquid molecules are arranged farther than solid molecules. On the contrary, freezing enthalpy is related with the energy a liquid sample needs to be converted to solid, in such a way, it is negative since that energy must be withdrawn to promote the liquid molecules to get closer and consequently turn solid. Summing this up, they have the same magnitude but differ on the sign.
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Hydrogen gas can be prepared in the laboratory by a single-displacement reaction in which solid zinc reacts with hydrochloric acid.How much zinc in grams is required to make 14.4 g of hydrogen gas through this reaction?
Zn +2 HCl ---------> ZnCl2 + H2
17.0 g H2 * 1 mol H2 / (2 * 1.008 g H2) * (1 mol Zn / 1 mol H2) =
8.432 mol Zn required
8.432 mol Zn * (65.39 g Zn / mol Zn) = 551.4 g Zn
Answer:
Explanation:
the balanced chemical equation for the displacement reaction between zinc and hydrchloric acid is given as
Zn + 2HCl → ZnCl₂ + H₂
mole ratio; 1 : 2 1 : 1
atomic mass of Zinc = 65.38g
atomic mass of hydrogen =1g
molecular mass of hydrgen(H₂) = 1×2=2g
from the chemical reaction above, it can be deduced that;
2g of hydrgen gas is produced from 65.38g of solid zinc
∴ 14.4g of hydrogen will be needing xg of solid zinc
x=[tex]\frac{14.4 X 65.38}{2}[/tex]
x = 941.472 ÷ 2
x=470.7g
14.4g of hydrogen requires 470.7g of solid zinc
Would you expect an organic compound to be soluble in water why
Answer: All organic compound depends on H-bonding with water. more stronger H-bonding with water more will be soluble.
Explanation:
1. It depends primarily upon the function groups of that compound. It also depends on the size of the compound.
2. some organic compound which soluble in water for example: alcohols, ethers, carboxylic acids. Because of the functional groups attached to the organic structure (the C-H backbone) are what effect the solubilities.Like carboxylic acids and alcohols form hydrogen bonds with the water, helping to solubilize it.
3. Take alcohols for example: methanol, ethanol, and isopropanol are all completely soluble in water. By the time you get to butanol and some of the larger alcohols, including those with more complex structures, they tend to be less soluble.
If you walk on a log that is floating in the water, the log moves backward what law
Newton's third law - every action has an opposite reaction
when you press a forward force the log moves backwards in opposite reaction
Final answer:
When you walk on a floating log and it moves backward, this is an example of Newton's third law of motion, which states for every action, there is an equal and opposite reaction. The action of walking on the log creates a force that pushes it backward.
Explanation:
When you walk on a log that is floating in the water and the log moves backward, this phenomenon is explained by Newton's third law of motion. Newton's third law states that for every action, there is an equal and opposite reaction. In this case, when you walk towards one end of the log, your feet push the log in the opposite direction with a force. Consequently, the log reacts to this force by moving in the opposite direction to your motion, which is backward. This principle is the same as a swimmer doing the breaststroke who pushes backward against the water, resulting in the water pushing forward on him, propelling him through the water.
This law helps explain various everyday actions and reactions, covering movements in sports, vehicle propulsion, and even celestial movements. For instance, when a person runs, they push against the ground with their feet, and the ground pushes them forward. This interaction between forces allows for motion and is a fundamental aspect of how we understand and interact with the physical world around us.
How does the kinetic energy of a substance's particles in the solid phase compare to their kinetic energy in the liquid phase? (2 points) The kinetic energy of the solid and liquid phases is the same. The kinetic energy of the substance's particles will depend on the volume of the substance. The particles have less kinetic energy in the solid phase than they do in the liquid phase. The particles have more kinetic energy in the solid phase than they do in the liquid phase.
Answer:
B
Explanation:
Propane burns in oxygen to produce carbon dioxide and steam. The unbalanced equation for this reaction is: C3H8 + O2 → CO2 + H2O
What is the molarity of a solution prepared by dissolving 33.4 g of sodium chloride in some water and then diluting the solution to a volume of 300.00 mL?
1. Since you must need the value for moles to find the molarity you have to convert 33.4g into moles.
33.4gNaCl / 58.44gNaCl = .572molNaCl
2. Since you cannot use mL to find molarity, you must convert the value into liters by dividing the value by 1000.
300.00 / 1000 = .3L
3. Now plug in your values into the equation. ( M = mol/L) [ Just divide moles by the liters]
M = .572 / .300 = 1.91M OR 1.91mol/L (Units can be M, or mol/L)
If the equilibrium concentrations of products are much greater than those of reactants in this system, what would be the magnitude of the equilibrium constant, K,? K < 1 K = 1 K > 1
Answer:
K > 1.
Explanation:
∵ The equilibrium constant K = [products]/[reactants].
Since, [products] > [reactants].
∴ The equilibrium constant K > 1.
Consider the given acid ionization constants. identify the strongest conjugate base. acid ka hf(aq) 3.5×10−4 hc7h5o2(aq) 6.5×10−5 hclo2(aq) 1.1×10−2 hc2h3o2(aq) 1.8×10−5 you may want to reference (pages 729 - 731) section 16.4 while completing this problem.
higher Ka value= stronger acid
stronger acids have weaker conjugate bases, so the acid with the strongest conjugate base would be acetic acid
A 25.0 ml sample of aqueous sodium hydroxide has been used to titrate to the second equivalence point 22.30 ml of 0.253 m sulfuric acid. What is the molarity of the sodium hydroxide solution?
The molarity of the sodium hydroxide is calculated by first calculating the number of moles of sulfuric acid in the 22.30 ml used.
This is done as follows since 0.253M is contained in 1000ml solution.
(0.253×22.3)/1000=0.00564 moles
The equation for the reaction is:
H₂SO₄₍ₐq)+2NaOH₍ₐq)⇒ Na₂SO₄₍aq) +2 H₂O₍l₎
Therefore the reacting ratios between sodium hydroxide and sulfuric acid is 2:1
therefore the number of moles that reacted with the sulfuric acid is calculated as follows:
(0.00564 moles ₓ 2)/1=0.01128moles
0.1128moles is in 25ml therefore, 1000ml has:
(1000ₓ0.01128moles)/25= 0.4512M NaOH
22.30 mL of 0.253 M H₂SO₄ titrates 25.0 mL of 0.448 M NaOH.
Let's consider the neutralization reaction between sulfuric acid and sodium hydroxide.
2 NaOH + H₂SO₄ ⇒ Na₂SO₄ + 2 H₂O
22.30 mL of 0.253 M H₂SO₄ react. The reacting moles of H₂SO₄ are:
[tex]0.02230 L \times \frac{0.253mol}{L} = 5.64 \times 10^{-3} mol[/tex]
The molar ratio of NaOH to H₂SO₄ is 2:1. The reacting moles of NaOH are:
[tex]5.64 \times 10^{-3} mol H_2SO_4 \times \frac{2molNaOH}{1 molH_2SO_4} = 0.0112 molNaOH[/tex]
0.0112 moles of NaOH are in 25.0 mL of solution. The molarity of NaOH is:
[tex]M = \frac{0.0112 mol}{0.0250L} = 0.448 M[/tex]
22.30 mL of 0.253 M H₂SO₄ titrates 25.0 mL of 0.448 M NaOH.
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How do you get the molar ratio and concentration of the acid?