Thermochemistry Question Preview (ID: 24566)
Thermochemistry And Equilibrium Activity.
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What is heat?
a) Energy that is transferred between objects, represented by the letter q
b) fuel from an engine
c) a measure of the amount of heat an object has
d) a change in temperature
What is temperature?
a) A measure of the amount of heat an object has
b) Energy that is transferred between objects, represented by the letter q
c) Heat always travels from the warmer object to the cooler object
d) A reaction where energy is absorbed from the surroundings
What is the Law of conservation of energy?
a) Since it absorbs heat, it would feel cold
b) A reaction where energy is absorbed from the surroundings
c) In any chemical or physical process energy is neither created nor destroyed.
d) Energy that is transferred between objects, represented by the letter q
What is an endothermic reaction?
a) A reaction where energy is absorbed from the surroundings
b) A reaction where energy is released from the system
c) A measure of the amount of heat an object has
d) A reaction in which energy is released to the surroundings
What would an exothermic reaction feel like?
a) Since it is releasing heat, it feels COLD
b) Since it is releasing heat, it feels HOT
c) A measure of the amount of heat an object has
d) Since it absorbs heat, it would feel cold
What is heat capacity?
a) It is the amount of heat needed to increase the temperature of an object exactly 10C. Heat capacity depends on both mass and
b) heat required for a reaction for a chemical reaction
c) A reaction where energy is absorbed from the surroundings
d) In any chemical or physical process energy is neither created nor destroyed.
What happens to temperature during a change of state?
a) While the substance is changing the temperature decreases
b) While the substance is changing the temperature increases
c) While the substance is changing the temperature remains constant
d) While the substance is changing the temperature increases and decreases
What is the activated complex?
a) Transition state (It is when the atoms have reached the highest energy. It only lasts a very short time. )
b) reactants
c) products
d) energy changes in a reaction
How does a catalyst affect the rate of reaction?
a) Catalysts has no affect on the rate of reaction
b) Catalysts lower the activation barrier making it harder for the atoms to reach the activation point.
c) Catalysts increases the activation barrier making it easier for the atoms to reach the activation point.
d) Catalysts lower the activation barrier making it easier for the atoms to reach the activation point.
When a reaction is at equilibrium what happens when more reactant is added?
a) More reactant will cause the equilibrium to shift toward the product
b) There will be some reactant and some product
c) There will be more product than reactant
d) It will not affect the reaction
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