Question 1

What is thermochemistry?

Accepted Answer

The study of the energy changes that accompany chemical reactions

Answer

The study of temperature changes in chemical reactions

Answer

The study of chemical bonding

Answer

The study of molecular structure

Question 2

What is the difference between exothermic and endothermic reactions?

Accepted Answer

Exothermic reactions release heat, while endothermic reactions absorb heat

Answer

Exothermic reactions involve the breaking of chemical bonds, while endothermic reactions involve the formation of chemical bonds

Answer

Exothermic reactions occur spontaneously, while endothermic reactions require an input of energy to occur

Answer

Exothermic reactions absorb heat, while endothermic reactions release heat

Question 3

What is the difference between heat and temperature?

Accepted Answer

Heat is the transfer of energy due to a temperature difference, while temperature is a measure of the average kinetic energy of particles in a substance

Answer

Heat is the measure of the average kinetic energy of particles in a substance, while temperature is the transfer of energy due to a temperature difference

Answer

Heat and temperature are both measures of the amount of energy contained in a substance

Answer

Heat and temperature are the same thing

Question 4

What is the difference between a system and a surroundings?

Accepted Answer

A system is the part of the universe being studied, while the surroundings are everything outside the system

Answer

A system and surroundings are the same thing

Answer

A system is a closed container, while the surroundings are the open air

Answer

A system is everything outside the surroundings, while the surroundings are what is being studied

Question 5

Which of the following is an example of an exothermic reaction?

Accepted Answer

Burning wood

Answer

Boiling water

Answer

Melting ice

Answer

Mixing baking soda and vinegar

Question 6

In an exothermic reaction, the products have ________________ energy than the reactants.

Accepted Answer

Less

Answer

It depends on the specific reaction

Answer

The same

Answer

More

Question 7

In an endothermic reaction, the products have ________________ energy than the reactants.

Accepted Answer

More

Answer

The same

Answer

Less

Answer

It depends on the specific reaction

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