Honors Thermochemistry

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 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 the direction of heat flow between objects?

Back

Heat flows from warmer objects to cooler objects.

Front

What is the significance of ΔH in a chemical reaction?

Back

ΔH represents the change in enthalpy, indicating whether a reaction is endothermic (positive ΔH) or exothermic (negative ΔH).

Front

What happens to the surroundings during an endothermic process?

Back

The surroundings lose energy, leading to a decrease in temperature.

Front

What happens to the surroundings during an exothermic process?

Back

The surroundings gain energy, leading to an increase in temperature.

Front

Give an example of an endothermic process.

Back

Melting of ice or snow is an example of an endothermic process, as it absorbs heat from the surroundings.

Front

Give an example of an exothermic process.

Back

Combustion of fuels, such as burning wood or gasoline, is an example of an exothermic process, as it releases heat.

Front

What is the formula for calculating heat change in a reaction?

Back

The formula is q = m * c * ΔT, where q is heat absorbed or released, m is mass, c is specific heat capacity, and ΔT is the change in temperature.

Front

What is the role of activation energy in chemical reactions?

Back

Activation energy is the minimum energy required for a reaction to occur, regardless of whether it is endothermic or exothermic.