Chemical Reactions Study Guide Review

Front

What is an exothermic reaction?

Back

An exothermic reaction is a chemical reaction that releases energy in the form of heat or light.

Front

What is an endothermic reaction?

Back

An endothermic reaction is a chemical reaction that absorbs energy from its surroundings.

Front

What is a precipitate?

Back

A precipitate is a solid that forms and settles out of a liquid mixture when two liquids are mixed.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form or appearance of a substance without changing its composition, while a chemical change results in the formation of one or more new substances.

Front

What happens to the total mass in a closed system during a chemical reaction?

Back

The total mass remains constant; it does not change before and after the reaction.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass cannot be created or destroyed in a chemical reaction.

Front

What is an example of an exothermic reaction?

Back

An example of an exothermic reaction is the combustion of fuels, such as burning wood or gasoline.

Front

What is an example of an endothermic reaction?

Back

An example of an endothermic reaction is the process of photosynthesis in plants.

Front

What is the role of energy in chemical reactions?

Back

Energy is either absorbed or released during chemical reactions, influencing the reaction's temperature and rate.

Front

What is a reactant?

Back

A reactant is a substance that undergoes a chemical change in a reaction.