Matter Spiral Review 3 CORRECTED

Place the following examples under the correct heading that describes the change that occurs.

Groups:

(a) Physical change

,

(b) Chemical change

,

(c) Physical and Chemical change

• Ice melting

• A raw egg is fried

• Matter is conserved

• Rusting of a nail

• Nitrogen gas and hydrogen gas combine and form ammonia

• Change in shape or phase

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS1-5

A student takes 4 samples of a white crystalline solid and places each in a well plate. On top of each sample, she places 20 drops of 4 mystery liquids (A, B, C, D) The results are below:

The solid dissolves quickly in liquid A

The solid remains unchanged with the addition of liquid B

The white solid remains, but dissolves very slowly in liquid C

When liquid D is added, fizzing occurs and the well becomes warmer.

In which well does a chemical change occur?

• A

• B

• C

• D

Tags

NGSS.MS-PS1-2

Four models for hypothetical chemical reactions are shown here. Individual circle represent individual atoms. Joined circles represent molecules. Which of the model represents chemical reactions that follow the law of conservation of matter? Select ALL that apply.

• Model A

• Model B

• Model C

• Model D

• All of the models follow the law of conservation of matter

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following statements describes a difference between a mixture and a pure substance?

• The density of a mixture can change with temperature, but the density of a pure substance cannot change.

• The composition of a mixture can vary from sample to sample, but the composition of a pure substance is always the same.

• A mixture has a specific melting point, while the melting point of a pure substance can vary.

• A mixture tends to be homogeneous, while a pure substance tends to be heterogeneous.

During a science lab, some students added small pieces of magnesium ribbon to 10 mL of hydrochloric acid. They noticed that bubbles formed, the test tube got hot, and the magnesium disappeared.

Which is a sign that a chemical reactions has taken place in THIS experiment.

• change in odor

• change in color

• release of heat energy

• disappearance of magnesium

Tags

NGSS.MS-PS1-2