8.5E Evidence of Chemical Reactions

Front

What is a chemical reaction?

Back

A process where substances (reactants) undergo a transformation to form new substances (products) with different properties.

Front

What is a precipitate?

Back

A solid substance that forms and settles out of a liquid mixture during a chemical reaction.

Front

What evidence indicates a chemical change has occurred?

Back

Evidence includes color change, temperature change, gas production, and formation of a precipitate.

Front

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

Back

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

Front

What happens to the mass of substances during a chemical reaction?

Back

The mass of the reactants equals the mass of the products, according to the law of conservation of mass.

Front

What is an example of a chemical reaction?

Back

The reaction of vinegar and baking soda producing carbon dioxide gas.

Front

What is an indicator of a chemical reaction involving temperature?

Back

An increase or decrease in temperature can indicate that a chemical reaction has occurred.

Front

What is the role of energy in chemical reactions?

Back

Energy is either absorbed or released during a chemical reaction, affecting the reaction rate and temperature.

Front

What is a reactant?

Back

A substance that undergoes change in a chemical reaction.

Front

What is a product?

Back

A substance that is formed as a result of a chemical reaction.