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 plastic keep the electricity from starting a fire?

Used to observe and describe matter

Matter breaks down into particles that are so small that it seems to disappear.

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?

A student was asked to compare the masses of four blocks that were all the same size but made of different materials. The student used a balance to compare the masses of two blocks at a time. The student repeated this process three more times with different pairs of blocks and recorded observations.

Which list shows the blocks in order from least to greatest mass?

A material that allows energy to flow through it is called a(n)

A property of attraction for metals.

A student puts four objects in a bucket filled with water. The objects are listed below. Which two objects are most likely less dense than the water?

The amount of matter packed into a given space compared to its ability to sink or float in water.

Mass, state of matter, ability to attract iron, and insulation are all examples of ___ of matter.

A material that does not allow energy to flow through it is called a(n)

The table lists some properties of four different samples of matter.

Which two samples could be glass and saltwater?

A ____ is a metal that attracts other metals if they contains iron or cobalt.