Chemical Changes

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

Tags

NGSS.MS-PS1-1

Acids have a low pH.

• true

• false

Which is a chemical change?

• Frost forming on the inside of a freezer

• Melting ice

• Boiling water

• A candle burning

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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

• reactant

• base

• mixture

• precipitate

Tags

NGSS.MS-PS1-2

A combustion reaction usually results in heat and ______.

• an acid

• light

• a base

• oxygen

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

• base

• chemical reaction

• acid

• mixture

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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

• a change in color

• The formation of gas bubbles

• an odor

• none of the above

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?

• law of conservation of land

• law of conservation of mass

• law of conservation of weight

• law of conservation of science

Tags

NGSS.MS-PS1-5