endothermic and exothermic reactions

What is an exothermic reaction?

A reaction that releases thermal energy.

What is an endothermic reaction?

A reaction that absorbs thermal energy.

What happens to temperature during an exothermic reaction?

The temperature increases as heat energy is given out.

What happens to temperature during an endothermic reaction?

The temperature decreases as heat energy is absorbed.

Give an example of an exothermic reaction.

Combustion, such as burning wood.

Give an example of an endothermic reaction.

Dissolving sherbet on your tongue.

What is activation energy?

The minimum amount of energy needed to start a chemical reaction.

What occurs when magnesium reacts with hydrochloric acid?

It is an exothermic reaction that releases heat.

What is the effect of potassium nitrate dissolving in water?

It is an endothermic process that cools the solution.

What is the role of chemical bonds in exothermic and endothermic reactions?

Bond-breaking is endothermic, while bond-making is exothermic.

What type of reaction is photosynthesis?

An endothermic reaction.

What type of reaction is respiration?

An exothermic reaction.

What happens to the energy in a cool pack when activated?

It absorbs heat from the surroundings, causing a cooling effect.

How does the temperature change when two solutions are mixed and the temperature rises?

It indicates an exothermic reaction where energy is released.

What is thermal decomposition?

A process that requires energy to break down compounds, often endothermic.

What is the temperature change when an endothermic reaction occurs?

The temperature drops as the reaction absorbs heat.

What happens to the reaction mixture in an endothermic reaction after it returns to room temperature?

The reaction products gain heat from the surroundings.

What is the significance of energy transfer in chemical reactions?

It determines whether a reaction is exothermic or endothermic.

What is a common characteristic of endothermic reactions?

They are relatively rare and often involve gas release.

What is the result of an exothermic reaction in terms of energy?

Energy is released to the surroundings.

What is an example of a reaction that causes everything to get colder?

An endothermic reaction, such as dissolving certain salts.

What is the temperature change observed in an endothermic reaction?

Starts at a higher temperature and cools down.