Chemical Reactions Flashcard

Front

What is a chemical reaction?

Back

A change in substances to become new substances—molecules break apart and their atoms rearrange to form new substances.

Front

What type of chemical reaction releases energy?

Back

Exothermic.

Front

What does the Law of Conservation of Mass state?

Back

The total mass of the reactants is equal to the total mass of the products.

Front

If there are 16 atoms in the reactants, how many should be in the products according to the Law of Conservation of Mass?

Back

16.

Front

What observation indicates a chemical reaction has occurred?

Back

Formation of a gas when vinegar is mixed with baking soda.

Front

What is an endothermic reaction?

Back

A chemical reaction that absorbs energy, usually in the form of heat.

Front

What is a reactant?

Back

A substance that undergoes change during a chemical 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 a precipitate?

Back

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

Front

What is thermal energy?

Back

The energy that comes from the temperature of matter; it is the total energy of all the particles in an object.