AP Chemistry Unit 6 Thermodynamics

Front

What is an exothermic reaction?

Back

An exothermic reaction is a chemical reaction that releases energy in the form of heat, resulting in a negative change in enthalpy (ΔH < 0).

Front

What does a negative delta H indicate?

Back

A negative delta H indicates that the reaction is exothermic, meaning it releases heat to the surroundings.

Front

What is an endothermic reaction?

Back

An endothermic reaction is a chemical reaction that absorbs energy from its surroundings, resulting in a positive change in enthalpy (ΔH > 0).

Front

In an endothermic reaction, does the system release energy?

Back

No, in an endothermic reaction, the system absorbs energy.

Front

What happens to temperature in an exothermic reaction?

Back

In an exothermic reaction, the temperature of the surroundings increases as heat is released.

Front

How does mass affect temperature change when absorbing energy?

Back

The smaller the mass of a substance, the greater the temperature change will be for a given amount of absorbed energy.

Front

If 2N2 + 3H2 --> 2NH3 + 46 kJ, how much energy is produced per mole of nitrogen?

Back

23 kJ of energy is produced per mole of nitrogen.

Front

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

Back

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

Front

What is specific heat capacity?

Back

Specific heat capacity is the amount of heat required to raise the temperature of 1 gram of a substance by 1 degree Celsius.

Front

What is the relationship between heat and temperature change?

Back

Heat is the energy transferred due to a temperature difference, and it causes a change in temperature of a substance.