Chemistry First Trimester Part 1

CFCs do not pose a threat to the environment because they are stable

• False

• True

What is the change of state in which a solid becomes a liquid?

• sublimation

• ionization

• melting

• condensation

What is the change of state in which a gas becomes a liquid?

• Condensation

• Sublimation

• Freezing

• Melting

Which is an intensive physical property?

• Length

• Color

• Volume

• Mass

Which is the part of the experiment that the researcher manipulates?

• Constant

• Control

• Independent variable

• Dependent variable

Look at the three solid blocks, made of the same material and with the exact same dimensions. Which block has the greatest mass?

• Block C

• They all have the same mass.

• Block A

• Block B

The figure shows the results of paper chromatography of a mixture of pigments. Based on the results shown, which pigment has the greatest attraction for the paper?

• A

• C

• B

• D

A student conducts an experiment to determine the effect of adding salt on the boiling temperature of water. The results are shown below.

Which SAMPLE is the control in this experiment?

• Sample 1

• Sample 3

• Sample 2

• Sample 4

Which is an example of a homogeneous mixture?

• Sand

• Clean air

• Fresh-squeezed orange juice

• Vegetable soup

A student conducts an experiment to determine the effect of adding salt on the boiling temperature of water. The results are shown below.

Which is a reasonable hypothesis for this experiment?

• Salt makes water boil

• If water is boiling, it must have salt added to it

• If salt is added to water, the water will boil at a higher temperature

• If salt is added to water, the water will get cloudy