Matter and Solutions Readiness Test

Compare the densities of the substances in the table. A student tries to predict how a density column using these substances would appear. She comes up with the following four options: Which order is correct?

• Option 1

• Option 2

• Option 3

• Option 4

Examine the two samples of matter in the diagram. What characteristics do gases and liquids share?

• Both have the same kinetic energy.

• Both have a definite volume and can only take up a set amount of space.

• Both have an indefinite shape and will take the shape of their containers.

• Both have molecules that are in constant contact with one another.

The image shows a solid and a liquid. Which statement accurately compares solids and liquids?

• Solids have greater kinetic energy than liquids.

• Liquids have greater kinetic energy than solids.

• Both solids and liquids have the same amount of kinetic energy.

• It is impossible to make a comparison between the kinetic energy of solids and liquids.

The image shows particles in a solid and in a gas. How is the gas different from the solid?

• The particles in the gas have less kinetic energy, and the particles in the solid have greater kinetic energy.

• The particles of the gas are in constant contact with each other, and the particles of the solid are not in constant contact with one another.

• The sample of gas has a definite shape, and the solid sample does not have a definite shape.

• The gas has an indefinite volume, and the solid has a definite volume.

Which of them are pure substances?

• Water (H₂O)

• Chocolate chip cookies

• Muddy water

• A bar of gold at Fort Knox

You are given a sample of matter on a tray. You can see dark and light particles. Using a magnet, you are able to separate the dark particles from the light particles. What term describes the sample of matter before you began your investigation?

• A solution, because you cannot see the different particles.

• A homogeneous mixture, because you can see the different particles.

• A heterogeneous mixture, because you can see the different particles.

• A pure substance, because you cannot see the different particles.

Coffee is a homogeneous mixture called a solution. Which diagram would best represent a cup of coffee at the molecular level?

• Option 1

• Option 2

• Option 3

• Option 4

Silicon is an element on the periodic table. It is lustrous (shiny). It is a semiconductor, meaning it can carry an electric current only under certain conditions. How would this element be classified?

• A. A metal

• B. A nonmetal

• C. A metalloid

• D. A nonmetalloid

Using the information in the data table, classify elements X and Y.

• Elements X and Y are metals.

• Elements X and Y are nonmetals.

• Element X is a metal and element Y is a nonmetal.

• Element X is a nonmetal and element Y is a metal.

Which is a characteristic of elements that are nonmetals?

• Nonmetals are lustrous (shiny).

• Nonmetals have low melting and boiling points.

• Nonmetals can be molded into different shapes when heated.

• Nonmetals can conduct electricity and heat.