Chemical Reactions Vocabulary

Front

A reaction that releases energy in the form of heat is known as...

Back

an exothermic reaction

Front

A reaction that absorbs energy in the form of heat is known as...

Back

an endothermic reaction

Front

The process by which one or more substances change to produce one or more different substances, defines ___________.

Back

a chemical reaction

Front

How does this show the conservation of mass?

Back

the masses of the reactants and products are equal

Front

substance that increases reaction rate by lowering the activation energy of a reaction

Back

catalyst

Front

A change to a substance that happens without forming a new substance.

Back

Physical change

Front

The total mass of the reactants before a chemical reaction is the same as the total mass of the products after the reaction, because matter cannot be created or destroyed.

Back

Law of Conservation of Mass

Front

The number of atoms you begin with in a chemical reaction ...

Back

must be the same as the number of atoms you end with

Front

Which one shows that a chemical reaction has occurred?

dissolving

,

melting

,

formation of a gas

,

bending

Back

formation of a gas

Front

One of the signs of a chemical reaction taking place is:

Back

Bubbles are produced