Chemical Reactions

Front

What is a chemical reaction?

Back

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

Front

What are common signs that a chemical change has occurred?

Back

A chemical has turned a different color, bubbled, and/or changed temperature.

Front

How does heating affect the rate of a chemical reaction?

Back

Heating usually makes the reaction happen faster.

Front

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

Back

In a chemical change, a new substance is formed; in a physical change, no new substance is formed.

Front

What is a reactant?

Back

A substance that is present at the start of a chemical reaction and is consumed during the reaction.

Front

What is a product in a chemical reaction?

Back

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

Front

What is the law of conservation of mass?

Back

In a chemical reaction, mass is neither created nor destroyed; the mass of reactants equals the mass of products.

Front

What is an example of a chemical change?

Back

Burning wood, which produces ash, smoke, and gases.

Front

What is an example of a physical change?

Back

Melting ice, which changes from solid to liquid but remains water.

Front

What role do catalysts play in chemical reactions?

Back

Catalysts speed up chemical reactions without being consumed in the process.