Which of these students is doing a demonstration that proves matter is made of tiny particles we cannot see?

• Monica blows air into a balloon and it gets bigger and bigger. She can't see anything inside the balloon, but she can feel that there is air in it!
• Deontay is ripping apart a piece of paper. He keeps ripping it into smaller pieces until he can't anymore. He thinks if he had a machine to keep ripping it, he could make it smaller.
• Celeste is using a light to grow plants in a dark closet indoors. The plants are growing even though they aren't in the sun!

What type of matter is described below?

• In this type of matter, the particles have very little attraction to each other. They are far apart and frozen in place, but can slide past each other if necessary.

Which of these best describes how the particles in a liquid move?

Which of these is made of tiny particles?

What is matter made of?

What are atoms?

True or False: Atoms are too small to be seen with the naked eye.

Inside of each atom (as tiny as they are) are even smaller individual particles called protons, neutrons, and electrons. Which of these particles has a negative charge?

What is the name of the scientific theory that recognizes that all matter is made of up parts that are too small to be seen without magnification?

Which of these best describes how the particles in a solid move?