Chemical Reactions Pretest

Substances that exist before the reaction.

• reactants

• products

• coefficients

• precipitates

Matter can only undergo two types of changes.

• True

• False

A change that results in a new substance that has properties different from the original.

• product

• chemical reaction

• physical change

• chemical change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Substances that are formed by the reaction.

• precipitate

• subscripts

• products

• reactants

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is an example of a physical change?

• temperature change

• unexpected color change

• change in size

• formation of a gas (bubbles)

Which of the following is an example of a chemical change?

• a change in color

• changing states of matter

• formation of a precipitate

• a change in shape

Tags

NGSS.MS-PS1-2

The process in which a chemical change has occurred.

• formation of a precipitate

• chemical change

• chemical reaction

• physical change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The big numbers that indicate how many molecules take part in the reaction.

• reactants

• subscripts

• coefficients

• products

Indicates the number of atoms of an element that are in that molecule.

• coefficients

• superscripts

• exponents

• subscripts

Which of the following symbols separates the reactants from the products in a chemical equation?

• 
• 
• 
•