20-21 Science Unit 1 Review: Classifying Matter

A material that stops or slows the flow of energy is called........?

Two wires carrying electricity can create a spark if they come too close together. This spark can start a fire. Wires carrying electricity are usually covered with plastic to keep them from starting a fire. Why does the plastic keep the electricity from starting a fire?

• Plastic conducts electricity.

• Plastic is softer than wire.

• Plastic can melt when heated.

• Plastic is a good insulator.

A student combined powdered paint with water to make a small amount of a blue liquid paint mixture. The student left the paint mixture in an open container. Several days later the student found the container and observed that changes had occurred. What most likely happened to the mixture?

• The container was empty after the mixture evaporated into the air.

• The paint evaporated leaving only clear water in the container.

• The water evaporated, leaving only a dry blue solid in the container.

• The liquid paint mixture was lighter in color after some water evaporated.

When thermal energy is decreased in a liquid and freezing occurs, what state of matter does the liquid change into?

• gas

• solid

• liquid

How many millimeters of blue liquid are in the beaker?

• 400ml

• 300ml

• 250ml

• 100ml

True or false: A solution is a type of mixture?

• True

• False

Particles are packed close together, has a definite shape, does not take the shape of a container...

• Solid

• Liquid

• Gas

• Plasma

Particles are loose but together, takes the shape of a container, has a definite volume

• Solid

• Liquid

• Gas

• Plasma

Particles are scattered wildly, takes the shape of a container, has no definite volume

• Solid

• Liquid

• Gas

• Plasma

Mass measures

• The amount of space an object takes up

• How heavy something is

• How much matter is in an object

• How hard something is