Honors Thermochemistry

Front

What is an endothermic reaction?

Back

An endothermic reaction is a chemical reaction that absorbs energy 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 energy to its surroundings, resulting in an increase in temperature of the surroundings.

Front

What is the significance of ΔH in a chemical reaction?

Back

ΔH represents the change in enthalpy, indicating whether a reaction is endothermic (ΔH > 0) or exothermic (ΔH < 0).

Front

What happens to chemical bonds during an endothermic reaction?

Back

Chemical bonds break during an endothermic reaction, which requires the absorption of energy.

Front

What happens to chemical bonds during an exothermic reaction?

Back

Chemical bonds form during an exothermic reaction, which releases energy.

Front

How does heat flow between objects?

Back

Heat flows from warmer objects to cooler objects until thermal equilibrium is reached.

Front

What is the role of energy in breaking chemical bonds?

Back

Energy must be absorbed to break chemical bonds, which is a key concept in endothermic reactions.

Front

What is quicklime (CaO) and its role in cement?

Back

Quicklime (CaO) is a key ingredient in cement that reacts with water to form calcium hydroxide (Ca(OH)2), releasing heat.

Front

What is the effect of an exothermic reaction on its surroundings?

Back

An exothermic reaction increases the temperature of its surroundings as it releases heat.

Front

What is the effect of an endothermic reaction on its surroundings?

Back

An endothermic reaction decreases the temperature of its surroundings as it absorbs heat.