Science 9 Chp. 2 Practice Test

Which of the following are pure substances?

• solutions
• compounds
• homogeneous mixtures
• heterogeneous mixtures

Which of the following is NOT a pure substance?

• milk
• oxygen
• sugar
• water

A substance that is made up of only one kind of atom is a(an)

• mixture.

• element.

• compound.

• solution.

If an unknown substance CANNOT be broken down into simpler substances, it is

• a mixture.

• a compound.

• an element.

• both a mixture and an element.

A mixture that appears to contain only one substance is a(an)

• suspension.

• compound.

• homogeneous mixture.

• heterogeneous mixture.

A substance has a melting point of 0° C and a boiling point of 100° C. The substance is most likely

• oxygen.

• hydrogen.

• water.

• gold.

Which of the following materials is useful for making molds because it has a low melting point?

• wax

• water

• iron

• lead

Filtration can be used to separate mixtures based on

• the size of their particles.

• their boiling points.

• their densities.

• their melting points.

When a physical change in a sample occurs, which of the following does NOT change?

• composition
• size
• shape
• temperature

A substance that has high reactivity

• burns in the presence of oxygen.

• displaces dissolved oxygen.

• easily combines chemically with other substances.