Unit 3 test: Thermochemistry Honors Form B

Front

What is an exothermic reaction?

Back

An exothermic reaction is a chemical reaction that releases heat to its surroundings, resulting in an increase in temperature of the surroundings.

Front

What is an endothermic reaction?

Back

An endothermic reaction is a chemical reaction that absorbs heat from its surroundings, resulting in a decrease in temperature of the surroundings.

Front

What is energy in the context of thermochemistry?

Back

Energy is the capacity to do work or to supply heat.

Front

What is the SI unit of energy?

Back

The SI unit of energy is the joule (J).

Front

What is specific heat capacity?

Back

Specific heat capacity is the amount of heat required to raise the temperature of one gram of a substance by one degree Celsius.

Front

How does the number of molecules affect heat absorption?

Back

A smaller number of molecules requires less heat to change temperature compared to a larger number of molecules.

Front

What happens to temperature during a phase change?

Back

During a phase change, the temperature remains constant while heat energy is absorbed or released.

Front

What is the difference between heat and temperature?

Back

Heat is the energy transferred between substances due to a temperature difference, while temperature is a measure of the average kinetic energy of the particles in a substance.

Front

What is the formula for calculating heat energy (q)?

Back

q = m * c * ΔT, where m is mass, c is specific heat capacity, and ΔT is the change in temperature.

Front

What is the role of heat in chemical reactions?

Back

Heat can be either absorbed or released during chemical reactions, influencing the reaction's direction and rate.