Question 1

A chemical change is also known as  ______________.

Accepted Answer

a chemical reaction

Answer

an explosion

Answer

a phase change

Answer

evaporation

Question 2

During a chemical reaction ____________ are broken.

Accepted Answer

bonds

Answer

plasma membrane

Answer

protons

Answer

electrons

Question 3

A ___________ is the substance present at the start of a reaction.

Accepted Answer

reactant

Answer

mixture

Answer

chemical

Answer

product

Question 4

A ____________ is a substance produced in a reaction.

Accepted Answer

product

Answer

reactant

Answer

precipitate

Answer

compound

Question 5

Which of these is not an indicator of a chemical reaction?

Accepted Answer

liquid turns to gas

Answer

a change in color

Answer

transfer of energy

Answer

the formation of a precipitate

Question 6

A _____________ is a solid that falls out of solution during a chemical reaction.

Accepted Answer

precipitate

Answer

gas

Answer

molecule

Answer

vapor

Question 7

The Law of Conservation of Mass states that ____________.

Accepted Answer

mass is neither created nor destroyed

Answer

an object at rest will stay at rest

Answer

molecules always combine in the same proportion

Question 8

The Law of Definite Proportions states that ___________.

Accepted Answer

molecules in a compound always combine in the same proportion

Answer

an object in motion, will stay in motion

Answer

mass is neither created nor destroyed

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