8th Grade Midterm Study Guide

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

A liquid becomes a solid.​

Malleability is a _________________ property

Do gamma rays from the Sun hit Earth's surface?

These wave require a medium to travel through

the amount of space that matter in an object occupies.

You need to know what units weight, mass and densitry are measured in.

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

You need to know your formulas and how to determine mass, volume and density

anything that has mass and takes up space

These wave are a disturbance in the electric and magnetic fields

A solid becomes a liquid.​

The time for one wave cycle to repeat

When your body digests food, the food is changed into new substances.

a measure of the gravitational force on an object.

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

Frequency is expressed in

a measure of the amount of matter in a given space.

The transfer of light energy to matter

Does not have a definite volume or shape.

In this wave, particles move back and forthin the same direction that the wave travel, or parallel to the wave.

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

Bouncing of light off a surface

the amount of matter in an object

Tea is an example of

Solubility is the ability of any substance to dissolve in another.

These waves give you sunburn

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

If you have a mass of 20 g and volume of 10 cm3, what is the density?

Air is matter

Negatively charged particles.

A snow globe is an example of a

A gas becomes a solid.

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

When light is sent into many directions as it passes through a medium

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

In this kind of wave particles move perpendicularly to the direction the wave travels

Transfer of energy as a EM waves

These materials do not let any light through.

Matter that transmits light is

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

An object with a density less than the density of water will float in water?

A homogeneous mixture the substances are evenly spread throughout.

Can you see a light wave in a vacuum?

Can you hear a bell ringing in a vacuum?

What kind of medium do earthquake waves use?

Cell phones use what kind of waves?

Substance has a definite volume and shape.

Solubility is a _________________ property

The material through which a wave travels

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

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

The distance from any point on a wave to the identicle point ont he next wave.

Positively charged particles.

Made up of different kinds of atoms chemically combined.

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

This is a measure of how far the particles in the medium move away from the normal rest position

Light is matter

Which waves do we use to look for alien life?

Change of direction of a wave as it passes through one medium into another at an angle.

Substance has a definite volume but not a definite shape.

Which waves can pass through you safely?

The basic building block of matter.​

A gas becomes a liquid.​

A solid becomes a gas.

The speed at which a wave travels

What kind of medium do ocean waves use?

Flammability is a _________________ property

materials that transmit light but do not let the light straight through.

The two parts of the EM spectrum that are close to visible light are

​A liquid becomes a gas (throughout).​

Uncharged particles

A disturbance that transfers energy from one place to another.

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

Magnetism is a ___________________ property

A jello fruit mold is an example of a

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

This tells you how many wave cycles occur in an amount of time.