Chemical Changes (U6L3)

The chemicals on the right side of an equation are referred to as the reactants.

• True

• False

Tags

NGSS.MS-PS1-5

The total amount of mass on the right side of a chemical equation is always equal to the total amount of mass on the left side of the equation.

• True

• False

Tags

NGSS.MS-PS1-5

Chemical reactions are the only way to form compounds.

• True

• False

Acids have a pH less than 7.

• True

• False

Which is a chemical change?

• a. melting ice

• b. boiling water

• c. a candle burning

• d. frost forming inside a freezer

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A solid formed by the chemical reaction of some solutions is a ________.

• a. mixture

• b. reactant

• c. precipitate

• d. base

A combustion reaction usually results in heat and ______.

• a. light

• b. an acid

• c. oxygen

• d. a base

Tags

NGSS.MS-PS1-5

When reactants form products, a(n) ______ has occurred.

• a. base

• b. chemical reaction

• c. acid

• d. mixture

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following indicate that a chemical reaction has occurred?

• a. the formation of gas bubbles

• b. a change in color

• c. an odor

• d. all of these indicate that a chemical reaction has occurred.

Tags

NGSS.MS-PS1-2

What law states that the total mass of the reactants equals the total mass of the products in a chemical reaction?

• a. the Constitution of the United States

• b. The law of conservation of energy

• c. The law of conservation of mass

• D. Howard Elementary school rules

Tags

NGSS.MS-PS1-5