Pretest Answers

A floating balloon can be formed when the substance helium is released from a compressed container into a flat rubber balloon. Then, the decompressed helium atoms expand and float up, making the rubber balloon expand around them and float with them. What is helium’s state when it does this?

A mass of charged ions that can expand out of an open container would be considered a

If a substance containing charged ions and electrons can be compressed so that the particles have less space between them, the substance is a

When atoms get more and more energy, they can ionize. What can happen to a gas as more energy is added to its atoms?

When a substance freezes, its atoms become locked in place so they do not move from one position to another. Therefore, any substance that is frozen is a

If a substance containing neutral atoms can be compressed a lot so that the atoms move closer together and the space between them decreases substantially, the substance is most likely a

Of the four states of matter, which has particles that are the most tightly packed together?

As more and more energy is added to the atoms of a solid plastic, the plastic will first change into

What is one difference between water and ice?

Why can the volume of a sample of plasma change when the substance is moved from one container to another?