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.

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.

Front

What happens to energy during evaporation?

Back

Evaporation is an endothermic process where energy is absorbed from the surroundings to convert liquid into vapor.

Front

What is the significance of heat in chemical reactions?

Back

Heat indicates whether a reaction is endothermic (absorbs heat) or exothermic (releases heat).

Front

What is the equation for the combustion of methane?

Back

CH4 + 2O2 → 2H2O + CO2 + heat.

Front

What type of reaction is combustion?

Back

Combustion is an exothermic reaction because it releases heat.

Front

How can you identify an exothermic reaction from a graph?

Back

In an exothermic reaction graph, the products have lower energy than the reactants, indicating heat release.

Front

What does it mean if products are at a higher energy than reactants?

Back

If products are at a higher energy than reactants, the reaction is endothermic, meaning it absorbed energy.

Front

Give an example of an endothermic process.

Back

Photosynthesis is an endothermic process where plants absorb sunlight to convert carbon dioxide and water into glucose.

Front

Give an example of an exothermic process.

Back

The burning of wood is an exothermic process that releases heat and light.