Physical Science Cumulative A Part 4

Dominic made the table below to organize his notes about mixtures.

What mistake did Dominic make?

• The title should read “Properties of Solutions” because some mixtures do not have all of the properties listed.

• There is a definite recipe to make each mixture, so the composition of a mixture is set.

• Although it is possible to have more than one state, it is also possible to have only one state.

• A single substance can be used to make a mixture if the substance is composed of more than one element.

A chemical reaction is the only way to separate a(n)

• element

• pure substance

• mixture

• solution

Julie takes a cold glass of clear, colorless liquid out of the refrigerator and puts it on the table. As the liquid warms up to room temperature, Julie sees bubbles of gas form in the liquid and rise to the surface.

Which conclusion is best supported by Julie’s observations?

• The liquid is a pure substance because it is colorless.

• The liquid is a mixture because its temperature rises.

• The liquid is a pure substance because it remains liquid when cold.

• The liquid is a mixture because it has a gas dissolved in a liquid.

Otis watches a cooking show on making mayonnaise. The chef dissolves salt and sugar in vinegar. She mixes in an egg yolk, and then mixes in oil until the ingredients are completely blended together. The chef says that it’s great on sandwiches and that it can be stored without separating.

Which best describes the purpose of the egg yolk in the recipe?

• It allows the oil to change from liquid to a gas in order to form bubbles.

• It acts to hold the vinegar and oil together in a colloid.

• It helps the vinegar be able to form a solution with the salt and sugar.

• It mixes with both the vinegar and oil to form a suspension.

Maria examines a mixture that appears to be the same throughout. However, when she looks at a sample using a magnifying lens, she can see small droplets of liquid surrounded by another liquid.

Which conclusion best fits her observations?

• The mixture is a solution because it has the same appearance throughout the sample.

• The mixture is a suspension because it is composed of two different-appearing substances.

• The mixture is a heterogeneous mixture because one liquid is dissolved in the other.

• The mixture is a colloid because two different substances can be seen in a small sample.

What is the correct classification of a mixture in which both a solid and a liquid are visible?

• a homogeneous mixture and a solution

• a homogeneous mixture and a suspension

• a heterogeneous mixture and a solution

• a heterogeneous mixture and a suspension

Which is a characteristic of colloids?

• will settle out over time

• are made up of at least two substances

• have large dispersed particles

• are homogeneous mixtures

When mixed, which states of matter form only a homogeneous mixture?

• two gases

• two liquids

• a solid and a liquid

• a liquid and a gas

Which material is the least likely to be recognized as a mixture by looking at it under a microscope?

• a suspension

• a colloid

• a homogeneous mixture

• a heterogeneous mixture

Fog is composed of water droplets in air. Which term describes fog?

• solution

• colloid

• suspension

• solvent