8th Grade Winter Final 2023

The number of protons in the nucleus of an atom is which of the following?

• atomic number
• isotope
• electron cloud
• ion

Adding thermal energy to a cup of water can cause the _____.

• particles to move faster
• particles to get farther apart
• particles to move faster or get farther apart or both
• particles to remain constant

Dry ice is a solid that changes directly to a gas when thermal energy is added. This is an example of ______.

• evaporation
• condensation
• sublimation
• unfreezing

A change in the state of matter is caused if enough _____ is added to or removed from an object.

• thermal energy
• potential energy
• kinetic energy
• force

Attractive forces between particles in a sample of matter are strong and pull the particles close together, keeping them in their positions. This is an example of

• surface tension
• the solid state of matter
• kinetic energy
• lunch detention

As the space in a container gets smaller, the _____ decreases.

• pressure
• volume
• temperature
• heat

Snow melts after a snowstorm because of the addition of _____.

• potential energy
• speed
• thermal energy
• snow

Lightning flashes contain which of the following types of matter?

• plasma
• liquid
• solid
• gas

Most of the mass of an atom is found in its ____.

• nucleus
• atomic number
• electron cloud
• mass number

If the ozone layer disappeared, life on Earth would be exposed to ____ concentrations of ultraviolet radiation.

• lower
• higher
• no change
• none of the above