8th Grade Atoms, Elements, and Compounds Study Guide

When you heat a sample of a solid, the sample gets a little bigger. This is mainly because:

• Heating the sample makes it lighter

• Heat helps the particles grow

• The particles move faster and get a little further apart

• Heating helps the particles slide past each other

The measure of the average kinetic energy of the particles of a substance is the ___.

• heat

• kinetic energy

• thermal energy

• temperature

Which particles have almost the same mass?

• electron and neutron

• proton and neutron

• all three particles

• proton and electron

This refers to the measure of the quantity of matter.

• atom

• mixture

• molecule

• mass

Food coloring spreads out faster in hot water than in cold water. This is mainly because

• The water molecules in hot water move more quickly

• Hot water is less dense

• The molecules in hot water are larger

• The food coloring molecules are small

The energy levels of an atom are occupied by ___.

• ions

• neutrons

• protons

• electrons

This is a combination of atoms of one or more elements.

• atom

• mass

• matter

• molecule

In an atom, electrons ___.

• are located in the nucleus

• travel outside the nucleus

• are paired with neutrons

• are always in the same place in an atom

The particles that make up an atom are ___.

• protons, neutrons, and electrons

• electrons, protons, and nuclei

• elements, protons, and electrons

• protons, neutrons, and nuclei

This is anything that occupies space and has mass and volume.

• atom

• liquid

• matter

• solid