Question

use the picture of the test - tube to answer questions 1 - 2.

1. the liquids in the test - tube float on top of each other in layers. the liquids have different densities. the liquids at the bottom of the tube have a greater density per unit volume than the liquids in the upper part of the tube.
2. what would happen if a solid object with the same density as the green liquid was dropped into the test - tube?

a. it would sink to the bottom because solids have higher density than liquids.
b. it would sink to the same level as the green liquid and stay there because it is the same density as the green liquid.
c. it would float on the surface because it is so small.
d. it would sink to the same level as the white liquid and stay there because it is the same density as the green liquid.
use the diagram to answer questions 3 - 5.

1. air is not a pure substance because it is made up of more than one type of matter.
2. which of the following components of air is a compound?

a. carbon dioxide
b. oxygen
c. nitrogen
d. argon

1. a molecule of carbon dioxide is made up of a carbon atom and two oxygen atoms. which of the following models represents carbon dioxide?

Explanation:

1. Objects with same density as a liquid will stay at the liquid's level.
2. Air is a mixture of multiple substances.
3. Carbon - dioxide is a compound with C and O atoms.
4. Carbon dioxide has 1 C and 2 O atoms.

Answer:

1. B. It would sink to the same level as the green liquid and stay there because it is the same density as the green liquid
2. more than one
3. A. carbon dioxide
4. (No models shown to choose from, but should be 1 - atom and 2 - atom model)