Physics Unit 2.4-2.7 Review

A small, dense center that has a positive charge and is surrounded by moving electrons.

A gas becomes a solid.

I should be able to explain the kinetic theory of matter.

A jello fruit mold is an example of a

How much the particles move and how often they bump into each other determine the state of matter of the substance.

The basic building block of matter.​

​A liquid becomes a gas (throughout).​

​A liquid becomes a gas (at the liquid’s surface).

Made up of one or more of the same kind of atom chemically combined.​

A liquid becomes a solid.​

A gas becomes a liquid.​

A heterogeneous mixture is one that does not have a uniform composition.

A homogeneous mixture the substances are evenly spread throughout.

Does not have a definite volume or shape.

Contains a variety of elements and compounds that are not chemically combined with each other.

Tea is an example of

The number of protons in the nucleus of an atom is the atomic number of that atom.

​Atoms combine in different ways to make up all of the substances you encounter every day.​

A solid becomes a liquid.​

The total number of protons and neutrons in an atom’s nucleus is its mass number.

Substance has a definite volume and shape.

A substance that has definite physical and chemical properties such as appearance, melting point, and reactivity.

Positively charged particles.

Substance has a definite volume but not a definite shape.

The current theory suggests that electrons move within an area around the nucleus called the

A snow globe is an example of a

Negatively charged particles.

Uncharged particles

A solid becomes a gas.

All matter is made of atoms or groups of atoms that are in constant motion.

Made up of different kinds of atoms chemically combined.