Quiz 13.1 - Heat Changes In Reactions
A quiz over heat changes in reactions and the factors affecting reaction rate.
- 1.
In this energy profile for a reaction, what is represented by the arrow labeled W?- A.
Activation energy
- B.
Energy of products
- C.
Energy of activated complex
- D.
Change in enthalpy
- 2.
In this energy profile for a reaction, what is represented by the arrow labeled Z?
- A.
Activation energy
- B.
Energy of products
- C.
Energy of activated complex
- D.
Change in enthalpy
- 3.
In this energy profile for a reaction, what is represented by the arrow labeled R?
- A.
Energy of reactants
- B.
Energy of products
- C.
Energy of activated complex
- D.
Change in enthalpy
- 4.
In this energy profile for a reaction, what is being plotted on the y-axis?
- A.
Progress of the reaction
- B.
Time
- C.
Potential energy
- D.
Mass of the reactants
- 5.
This reaction is best described as
- A.
Endothermic
- B.
Exothermic
- C.
Catalyzed
- D.
A multi-step reaction mechanism
- 6.A catalyst is best described as
- A.
A substance which speeds up a reaction without being consumed.
- B.
A substance which adds sufficient heat to a chemical reaction to allow it to react.
- C.
A substance which grinds the reactants into smaller pieces so they can react faster.
- D.
A substance which prevents a reaction from happening at all.
- 7.In the equation Q=MCDT, the variable Q stands for
- A.
Question (in grams).
- B.
Heat (in joules).
- C.
Specific heat capacity (in Joules/gram-degrees Celsius).
- D.
Change in temperature (in degrees Celsius).
- 8.A good way to speed up a chemical reaction would be to
- A.
Lower the temperature of the reaction vessel.
- B.
Use larger chunks of reactants.
- C.
Increase the concentration of the reactants.
- D.
Use a larger beaker for the reaction, instead of a smaller one.
- 9.Generally, an easy way to double the rate of a chemical reaction would be to
- A.
Use larger chunks of material in the reactions.
- B.
Lower the temperature by 15 degrees Celsius.
- C.
Stir the reaction beaker vigorously.
- D.
Raise the temperature by 10 degrees Celsius.
- 10.A high-energy, unstable compound that is formed after the reactant phase but before the product phase is called a(n) ___.
- A.
Catalyst.
- B.
Substrate.
- C.
Joule.
- D.
Activated complex.
Questions: 10 | Attempts: 140 | Last updated: Mar 22, 2022
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