Chemical Reactions #1, gk

The participants in a chemical reaction are called the ____.

• products

• catalysts

• enzymes

• reactants

In a chemical reaction the arrow always points toward the

• reactants

• catalyst

• products

• enzymes

Changing the size, shape, or state of matter of a substance is a _____ change.

• physical

• chemical

Only a ______ change results in a new and different substance as a product.

• physical

• chemical

Boiling a liquid into a gas causes a/an _____ change.

• chemical

• physical

C + O_{2 --->} CO₂ is a chemical ____.

• reaction

• equation

C + O_{2 --->} CO₂ is the equation for the event which is a chemical ____.

• reaction

• equation

According to the law of _____ matter is neither created nor destroyed in a chemical reaction.

• definite proportions

• conservation of mass

• motion

• universal gravitation

Chemical equations must be balanced because the law of ____.

• universal gravitation

• definite proportions

• motion

• conservation of mass

Because of the law of conservation of mass chemical equations must be ____.

• balanced

• written from left to right

• directed to the right