Physical Science Unit #2 Test - Extraction

Matter is defined as anything that

• can be seen and touched.

• has mass and takes up space.

• can be weighed.

• contains kinetic energy.

Why is light not a form of matter? (1 point)

• It has no mass and does not take up space.

• It travels too fast to be considered matter.

• It is made only of waves, not particles.

• It cannot be seen without special equipment.

A material that can be represented by a chemical formula is

• an element.

• a mixture.

• a homogeneous solution.

• a pure substance.

How many atoms are in a single molecule of Fe2O3?

• 2

• 3

• 5

• 6

Which of the following is made of at least two different types of atoms?

• element

• molecule

• compound

• matter

The different substances in a mixture

• keep their properties.

• combine chemically.

• form new molecules.

• cannot be separated.

Unlike a mixture, a pure substance has

• atoms

• molecules

• a specific size

• a fixed composition

You put 1 spoonful of salt into 1 liter of water and stir. The resulting liquid is an example of a(n)

• pure substance.

• homogeneous mixture.

• heterogeneous mixture.

• immiscible mixture.

A heterogeneous mixture is one that is not

• uniform throughout.

• easily mixed together.

• made of two or more liquids.

• edible by humans.

Why is pure orange juice a mixture? (1 point)

• It contains many substances such as water, sugars, acids, and pulp distributed together.

• It is a single compound made only of identical molecules.

• It is completely uniform and cannot be separated by any physical means.

• It is produced naturally, so it must be a pure substance.