Properties, Chemical Reactions

Silver tarnishes is:

• Physical change

• Chemical change

• Physical property

• Chemical property

Tags

NGSS.MS-PS1-2

Salad dressing separates when sitting

• Physical property

• Chemical property

• Physical change

• Chemical change

Which of the following is NOT a sign of a chemical reaction?

• Formation of a solid

• Heat exchange

• liberation of gas

• change in state

Tags

NGSS.MS-PS1-2

Which is a statement of the law of conservation of mass?

• Mass can be created or destroyed.

• The total mass of before the reaction is the same as the total mass after the reaction.

• Every reaction creates an equal amount of mass related to the amount of energy required for the reaction.

• The total amount of mass is equal to the volume of both chemicals in the reaction.

Tags

NGSS.MS-PS1-5

When a substance undergoes a chemical change, its identity does not change.

• True

• False

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

• bending a pop can

• boiling milk

• melting wax

• burning paper

Tags

NGSS.MS-PS1-2

An example of a chemical change is ____.

• a magnet sticking to the refrigerator

• dew disappearing from the grass

• frying a hamburger

• mashing potatoes

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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

• lighting a match

• dissolving salt into water

• freezing water

• breaking a glass

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Solid sodium hydroxide NaOH decomposes on heating to produce solid sodium oxide Na₂O and water vapor H₂O.

The product(s) are:

• NaOH

• Na₂O and H₂O

• H₂O

• Na₂O and NaOH

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A chemical change may involve

• Evolution of gas

• Change in color

• Change in temperature

• All of the above

Tags

NGSS.MS-PS1-2