Answer:
[tex]\boxed{\text{Replacing the cube of manganese(IV) oxide with its powder}}[/tex]
Explanation:
The MnO₂ is acting as a catalyst: it takes part in the reaction but can be recovered at the end.
A. Using a 2 g cube of MnO₂
The surface area of the catalyst would double, so the rate would probably double. Technically, this option is correct, but I don't think it is the one the questioner intended.
B. Using 50 cm³ of H₂O₂
No effect. The rate depends on how fast the H₂O₂ molecules can reach the surface of the catalyst, and the surface area hasn't changed.
C. Using powdered MnO₂
This would increase the rate enormously, because the powdered catalyst has a much greater surface.
D. Removing MnO₂
The rate would decrease to near-zero, because there is no catalyst.
Replacing the cube of manganese (IV) oxide with its powder is likely to increase the rate of product formation in the reaction between manganese (IV) oxide and hydrogen peroxide, due to increased surface area and more active sites for the reaction. Option C is correct.
When 1 g of a cube of manganese (IV) oxide was added to 100 cm³ of hydrogen peroxide to produce water and oxygen, with manganese oxide acting as a catalyst and not being consumed, certain changes can increase the rate of product formation.
Among the provided options, replacing the cube of manganese (IV) oxide with its powder will likely increase the rate of formation of the products most effectively. This is because increasing the surface area of the catalyst, in this case by using powdered manganese oxide instead of a cube, provides more active sites for the reaction, thus facilitating a higher rate of chemical reaction.
On the contrary, using more manganese oxide beyond what is needed as a catalyst does not increase the rate of reaction because a catalyst is not consumed in the reaction. Reducing the volume of hydrogen peroxide or removing the catalyst will not increase the reaction rate but may have the opposite effect.
Hence, C. is the correct option.
The complete question is:
content loaded
When 1 g of a cube of manganese (IV) oxide was added to 100 cm³ of hydrogen peroxide, water and oxygen were produced. Manganese oxide was not used up in the reaction. Based on this information, which of the following is likely to increase the rate formation of the products?
A. Using 2 grams of manganese oxide
B. Using 50 cm³ of hydrogen peroxide
C. Replacing the cube of manganese (IV) oxide with its powder
D. Removing manganese (IV) oxide from the reaction mixture
Describe an object that is transparent. What quality makes it transparent?
Answer: Water
Explanation: Water is an example of transparent because light can pass through it. Air is also an example.
Final answer:
A transparent object, such as a clean glass window, transmits light without significant absorption or reflection. The quality that makes an object transparent is its ability to let light pass through it effectively, as seen in high-quality diamonds, which refract white light and disperse it into its composite colors, causing a sparkling effect.
Explanation:
An object that is transparent allows light to pass through it without scattering, making it possible to see through the object clearly. A common everyday example of a transparent object is a clean glass window. Glass is transparent because it transmits light rather than absorbing or reflecting it, thus allowing a high proportion of the light spectrum to pass through without significant distortion.
The quality that makes an object transparent is its ability to transmit light waves effectively. When light encounters a transparent material, the photons that make up the light are not significantly absorbed by the material's atoms or reflected away, but rather they pass through the atomic structure of the material without being scattered.
A perfect example of this phenomenon is a high-quality diamond, which is clear and colorless, transmitting all visible wavelengths of light. The diamond sparkles with flashes of brilliant color when illuminated by white light because it refracts, or bends, the light, splitting it into its composite colors in a process similar to a prism. This is known as dispersion, which coupled with the internal reflections within the diamond due to its cut and high refractive index, causes the sparkle with various colors.
3. Because tap water is slightly acidic, water pipes made of iron corrode over time, as shown by the balanced ionic equation below. Explain, in terms of chemical reactivity, why copper pipes are less likely to corrode than
iron pipes.
2Fe(s) + 6H*(aq) → 2Fe3+(aq) + 3H2(g)
please someone help with this
acidic tap water form green layer ofcarbonate on copper surface which prevent it from corrosion but iron when react to water and oxygen form rust
also fe lies above than cu in activity series
The chemical reactivity of copper is less than iron and with the formation of stable copper oxide, copper pipes are less likely to corrode.
What is corrosion?The corrosion or rusting is the chemical phenomenon given by an element that results in the decomposition of the metal into stable oxide.
The copper metal in the presence of oxygen forms the more stable and unreactive copper oxide that protect the metal from corrosion.
The chemical equation for the formation of copper oxide is:
4 Cu + O₂ → 2 Cu₂O
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what is an extensive property? ( in regards to enthalpy )
The extensive properties come under physical property which depends on the size of the system. The enthalpy comes under extensive property which is a thermodynamic property where the internal energy; and the pressure and volume of the system is related.
The change in enthalpy is related to energy transfer at certain pressure which is related to the endothermic and exothermic reactions taking place on the system. Since, all these reactions and heat transfer from the system to the environment is based on the physical property, enthalpy is called as extensive property.
Select all the species that are ions.
HCl
NaCl
NH4+
H2PO4-
CCl4
H3O+
Answer:
NH₄⁺
H₂PO₄⁻
H₃O⁺
Explanation:
An ion is an atom or molecule with a net electric charge due to the loss or gain of one or more electrons.Ion may be positively charged "cation" or negatively charged "anion".Neutral molecule has a net charge of zero.So, the species that are ions are:
NH₄⁺
H₂PO₄⁻
H₃O⁺
Answer:
NH₄⁺
H₂PO₄⁻
H₃O⁺
Explanation:
WHEN parking uphill in a car with a manual transmission you should park with the transmission in
First gear OR reverse gear?????
For a manual transmission, park in first gear when facing uphill, and in reverse when facing downhill, always using the parking brake and turning the wheels away from the curb when parked uphill.
Explanation:When parking uphill in a car with a manual transmission, it is generally recommended to park with the transmission in first gear if you are facing uphill and reverse gear if you are facing downhill. This helps to ensure that if your parking brake fails, the engine will help prevent the car from rolling. However, always remember to use the parking brake regardless of the gear used. It is also advisable to turn your wheels away from the curb when parking uphill, so in the event your car begins to roll, it will roll into the curb which can help stop the car.
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What is the pOH of a solution of HNO3 that has [OH– ] = 9.50 × 10–9 M?
Answer:
pOH = 8.02
Explanation:
Given:
[OH-] concentration for HNO3 solution = 9.50*10^-9 M
To determine:
pOH of the above solution
Explanation:
pOH of a given solution refers to the concentration of OH- ions i.e. the degree of basicity of that solution
[tex]pOH = -log[OH-]\\\\For\ the \ HNO3\ solution:\\\\pOH = -log(9.50*10^{-9}) = 8.02[/tex]
A lab director asks two students, Lydia and Damien, to each select a bottle of a concentrated weak base. When they reach the
cabinets, they find different chemical solutions with varying concentrations. All of the options are bases. Which bottles should they choose?
Lydia should select the bottle of _______. Damien should select the bottle of ________
Answer:
First one is 5.0 M ammonia and the Second one ?
Explanation:
Lydia and Damian will select bases with low kb that are present in highly concentrated solutions in the storage cabinet.
What are Bases?In a chemical process, bases are compounds that can accept hydrogen ions (H+). They often taste bitter, are slippery to the touch, and have the ability to change the color of litmus paper from red to blue. Typical examples of bases are sodium hydroxide (NaOH), ammonia (NH3), and baking soda (sodium bicarbonate, NaHCO3). Acids, which cause a chemical reaction to release hydrogen ions (H+), are the opposite of bases.
The ability of a base to accept hydrogen ions determines the strength of the base. While weak bases, such as ammonia, have a low affinity for hydrogen ions and can only partially dissociate in water, strong bases, such as sodium hydroxide, have a high affinity for hydrogen ions and can dissociate completely in water. Alkalis play an important role in many chemical processes.
Therefore, Lydia and Damian will select bases with low kb that are present in highly concentrated solutions in the storage cabinet.
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Consider the following reaction:
iron (s) + chlorine (g) à iron (III) chloride
a. Write the balanced chemical equation.
b. 25.0 g of iron reacts with excess chlorine gas.
a. Calculate the moles of iron reactant.
b. Calculate the moles of iron (III) chloride.
c. Calculate the mass of iron (III) chloride.
Answer:
Explanation:
Fe + Cl₂ → FeCl₃
a. The balanced equation
All chemical equations obey the law of conservation of matter. To balance this above equation, we either inspect or use mathematical method to obtain a balanced equation.
We put coefficients a, b and c at the back of the compounds as shown below:
aFe + bCl₂ → cFeCl₃
For Fe:
a = c (i)
For Cl:
2b = 3c (ii)
let a = 1, c= 1
Solving for the unknown b, we have:
b = [tex]\frac{3c}{2}[/tex]
b = [tex]\frac{3}{2}[/tex]
The complete reaction equation is therefore:
Fe + [tex]\frac{3}{2}[/tex]Cl₂ → FeCl₃
or
2Fe + 3Cl₂ → 2FeCl₃
Problem a:
Mass of reacting iron = 25g
unknown: number of moles of iron
Solution
To find the number of moles, we apply the mole concept using the expression below:
[tex]number of moles = \frac{mass}{molar mass} \\[/tex]
To find the molar mass of the reactant iron, we know atomic mass of iron is 56g.
The molar mass is therefore, 56gmol⁻¹
[tex]number of moles = \frac{25}{56} \\[/tex]
number of moles of the iron reactant = 0.45mole
Problem b:
From the balanced equation of the reaction:
2Fe + 3Cl₂ → 2FeCl₃
2 moles of Fe produces 2 moles of FeCl₃
So 0.45mole of Fe would produce 0.45 mole of FeCl₃
Problem C:
Applying the mole concept;
mass of FeCl₃ = number of moles of FeCl₃ x molar mass of FeCl₃
number of moles of FeCl₃ = 0.45mole
molar mass of FeCl₃ = ?
Atomic mass of Fe = 56g
Cl = 35.5g
Molar mass of FeCl₃ = 56 + (3 x 35.5) = 56 + 106.5 = 162.5gmol⁻¹
mass of FeCl₃ = 0.45 x 162.5 = 73.1g
36 grams of water vapor takes up how many liters at room temperature and pressure (293 K and 100 kPa)?
Answer:
V = 48.7 L
Explanation:
We can calculate the volume V, by using the ideal gas law:
P V = n R T
Where we have:
P is the pressure, V is the volume, and T is the temperature T, R is the gas constant, and n is the number of moles of the gas.
According to the international unit systems R is 8.314 J / K. mol.
With this value the P unit will be Pa and the V unit will be m³.
Then,
V = (n R T)/ P
V = [(36/18) × 8.314 × 293] / (100 * 1000)
V = 0.0487 m³
And the volume by litter unit is:
V = 48.7 L
what is the percent composition of iron in FeCl3
Final answer:
The percent composition of iron in FeCl3 is 34.43%.
Explanation:
The percent composition of iron in FeCl3 can be calculated by dividing the mass of iron by the molar mass of FeCl3 and multiplying by 100%. FeCl3 consists of one iron atom and three chlorine atoms. The atomic mass of iron is 55.845 g/mol and the atomic mass of chlorine is 35.453 g/mol. Therefore, the molar mass of FeCl3 is 55.845 g/mol + 3 * 35.453 g/mol = 162.204 g/mol. The mass of iron in FeCl3 is 55.845 g/mol / 162.204 g/mol * 100% = 34.43%.
How many grams are in 11.9 moles of chromirum
Answer:
Explanation:
Method 1 proportion
1 mole of chromium is 52 grams
11.9 moles = x grams
1/11.9 = 52/x Cross multiply
x = 11.9 * 52
x = 618.8 grams
Now I have used an approximate mass for Chromium. The answer you get here is expected to reflect the weigth given on your periodic table Use that to get your answer. You should give a number very close to mine. Round to 3 places as in 619.
Method Two Formula
mols = given mass / molecular mass
11.9 = given mass / 51.9961 Multiply both sides by 51.9961
11.9 *51.9961 = given mass
given mass = 618.75
given mass = 619
the equivalent weight of sodium thiosulfate
The equivalent weight is the gram molecular weight divided by the number of electrons lost or gained by each molecule; For sodium thiosulfate (Na2S2O3·5H2O), this is (248.17/1) g.
Which of these extends the farthest out into the ocean ( beach berm or shore)
Answer:
berm
a berm can be somethint in the middle or water and you can see it once the water go down oe dryes
petrolium is a mixture consisting mostly of
Answer:Petroleum is a naturally occurring complex mixture made up predominantly of carbon and hydrogen compounds
Explanation:
What happens during a endothermic reaction
An endothermic reaction occurs when the energy used to break the bonds in the reactants is greater than the energy given out when bonds are formed in the products. This means that overall the reaction takes in energy, therefore there is a temperature decrease in the surroundings.
Answer:
There is a temperature decrease in the surroundings
Explanation:
An endothermic reaction occurs when the energy used to break the bonds in the reactants is greater than the energy given out when bonds are formed in the products. This means that overall the reaction takes in energy, therefore there is a temperature decrease in the surroundings
A device used to measure small currents is a(n)
Answer:
Ammeter
Explanation:
An ammeter (from Ampere Meter) is a measuring instrument used to measure the current in a circuit. Electric currents are measured in amperes (A), hence the name. Instruments used to measure smaller currents, in the milliampere or microampere range, are designated as milliammeters or microammeters.
4HCl + O2 ⇌ 2H2O + Cl2
Which of the following would result from increasing the volume of oxygen?
The volume of hydrochloric acid increases.
The rate of forward reaction increases.
The rate of backward reaction increases.
The volume of water vapor decreases.
Answer:
The rate of forward reaction increases.
Explanation:
Le Châtelier's principle states that when there is an dynamic equilibrium, and this equilibrium is disturbed by an external factor, the equilibrium will be shifted in the direction that can cancel the effect of the external factor to reattain the equilibrium.Increasing the volume of oxygen:
will increase the concentration of oxygen (reactants), so the equilibrium will be shifted to the right side (products side) to suppress the effect of increasing the volume of oxygen.
So, the right choice is: The rate of forward reaction increases.
Metalic element in list.
Metallic element in list of paper is Titan.
An electron moved from a higher energy level to a lower energy level. What most likely happened during the transition?
Answer: A. A photon was released.
An electron moved from a higher energy level to a lower energy level. What most likely happened during the transition? (5 points)
A. A photon was released.
B. A photon was absorbed.
C. A fixed amount of energy was absorbed.
D. A random amount of energy was released.
Explanation:
I just took the test and A. A photon was released is the correct answer!
Good Luck!!
( P.S.- I just used the other answer on the test and it was incorrect, but this one is correct because I finished the test and got the answer key!)
During the electron's transition from a higher to a lower energy level, it most likely released energy, possibly in the form of light, consistent with Bohr's model of the atom.
Explanation:When an electron moves from a higher energy level to a lower energy level, it most likely emitted energy. This concept is grounded in Bohr's model of the atom where each electron orbit is an energy level with a specific energy value. A transition between these levels involves a change in the electron's energy, corresponding to the energy difference between the levels.
For example, if an electron moves from level 8 to level 1, it descends through several energy levels and, according to Bohr's model, emits energy at each transition. This energy can be quantified, such as in the change of -10.2 eV from a higher to a lower state, releasing 10.2 eV of energy. The emitted energy often manifests as light, with the color depending on the energy change involved.
What is the name of this compound?
2-butanone
2-pentanone
4-pentanone
4-butanone
Answer:
2-pentanone
Explanation:
The oxygen atom is attached to the 2nd carbon atom in the longest linear chain, thus the prefix 2. the longest continuous carbon chain has five carbon atoms giving it the prefix pent-. the chemical is a ketone thus the suffix none.
What is the mass of oxygen atoms in 1 mole of water
The mass of oxygen atoms in 1 mole of water is 16 grams.
Explanation:This can be calculated by looking at the molecular formula of water, which is H2O. From this formula, we know that one molecule of water contains two hydrogen (H) atoms and one oxygen (O) atom.
Given that the molar mass of hydrogen is 1 gram/mole and the molar mass of oxygen is 16 grams/mole, we can determine that the mass ratio of hydrogen to oxygen in a water molecule is 2:1.
Therefore, in 1 mole of water, we have 2 moles of hydrogen atoms and 1 mole of oxygen atoms.
Multiplying the molar mass of oxygen (16 grams/mole) by the number of moles (1 mole) gives us a mass of 16 grams for the oxygen atoms in 1 mole of water.
How are pressure units converted ?
Answer: 1 = 1e-5
Explanation: Divide the pressure value by 100000
What are genes?
a) the observable characteristic
b) the expressed trait
c) the basic unit of inheritance
d) the measurable factor
C) the basic unit of inheritance
In an experiment you are asked to react hydrochloric acid with sodium hydroxide. When measuring the volume of the reactants, which instrument would give the greatest precision?
100 mL Graduated cylinder
250 mL Erlenmeyer flask
100 mL Beaker
200 mL Beaker
Answer:
100 mL Graduated cylinder.
Explanation:
The instrument would give the greatest precision is 100 mL Graduated cylinder.
Because it has the smallest diameter and it is graduated every 1.0 mL. so, its error percent is the lowest.
Beaker and Erlenmeyer flask have a greater diameter and their grauation is every 10.0 mL. So, their error % is larger.
Answer:
The answer would be 100 ml graduated cylinder
Explanation:
The latent heat of vaporization of water is 540 calories/gram. How many calories are required to completely vaporize 500 grams of water? 1,040 cal 40 cal 270,000 cal 1.08 cal
The amount of heat needed to vaporize the given amount of water is the product of the amount in grams and the latent heat of vaporization in cal per gram. That is,
H = (540 calories / gram)( 500 grams) = 270,000 cal
Thus, the heat needed is 270, 000 calories. The answer is letter C.
Hope this helps :) thats just a sh
Answer:
270,000 cal
Explanation:
In order to calculate the calories needed to completely vaporize 500 grams of water we just have to use the formula of the latent heat of vaporization, we know that it takes 540 calories to vaporize a gram of water, so we just multiply that by the number of grams:
(500 grams of water)(540 calories/gram)= 270,000 calories
It would taje 270,000 calories to vaporize 500 grams of water.
Balance the following equation. Choose "blank" if no coefficient other than 1 is needed.
Choose Pb + Choose AgNO 3 Choose Pb(NO 3 ) 2 + Choose Ag
Answer:
Pb + 2AgNO3 ---> Pb(NO3)2 + 2Ag
Explanation:
The lead Pb2+ ion has a valency of 2 and therefore combines with 2 nitrate ions (NO3)-..
[tex]Pb + 2AgNO_3[/tex] → [tex]Pb(NO_3)_2 + 2Ag[/tex]
What is a balanced chemical equation?An equation that has an equal number of atoms of each element on both sides of the equation is called a balanced chemical equation.
[tex]Pb + 2AgNO_3[/tex] → [tex]Pb(NO_3)_2 + 2Ag[/tex]
This is the balanced chemical equation. Where there are 1 Pb, 2 Ag, 2N, and 6 oxygen atoms on both sides.
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Which consequence of global warming is described as having an increase in growing season changes in migration and loss of species
Answer:
Deforestation, increase wildlife extinction, ecosystem imbalances, soil erosion, migration and loss of species.
Explanation:
Global warming is warming the earth's surface temperature, which causes the changes in our ecosystem like deforestation, soil erosion, climate changes, migration and loss of species etc.
Global warming is caused by the 'Greenhouse effect', major gases are carbon dioxide(9-26%), methane(4-9%), water vapour(36-70%) ozone(3-7%) and nitrous oxide.
Global warming affects on the ocean include rising sea level, meiting glaciers, thermal expansion and ice sheets. It also cause the bird migration which carries high cost of predation and mortality.
Answer:
D. altered ecosystems
Explanation:
Deforestation, increase wildlife extinction, ecosystem imbalances, soil erosion, migration and loss of species are all effects of global warming. These are under the umbrella of consequences from global warming.
what is the charge on the cation in the ionic compund sodium sulfide
Answer:
Since this is an ionic compound, you must balance the charges so that overall charge of the compound is neutral. Sodium, an alkali metal, has a tendency to lose one electron. As a result sodium normally carries a positive one charge. Sulfur, a nonmetal, has a tendency to gain 2 electrons.
Explanation:
Answer:
Sodium commonly forms a
+
I
ion.
Explanation:
And thus the chemical formula for sodium sulfide is
Na2S , i.e. two sodium ions are required to form a neutral salt with
S2-
how many grams of silver chromate, Ag2CrO4, are produced from 57.7
g of silver nitrate, AgNO3?
Need help on this ASAP !!!!
Answer:
N₂ + 3H₂ → 2NH₃. "synthesis reaction".
Explanation:
To balance the equation, you should apply the law of conservation of mass for the equations.
The law of conservation of mass states that the no. of each atom is equal in both sides (reactants and products).
The balanced equation is:
N₂ + 3H₂ → 2NH₃.
It is a synthesis reaction that 2 reactants give 1 product.
That 1.0 mole of N₂ reacts with 3.0 moles of H₂ to produce 2.0 moles of NH₃.
The no. of all atoms is the same in both of reactants and products side.
N (2), and H (6).