1. Solid, liquid, gas
2. The sentence is false. A copper wire does not have a definite shape because it can be bent or reshaped.
3. Gas: particles are far apart; Liquid: particles are close together but can move past each other; Solid: particles are packed closely together and vibrate in place.
4. Solid
5. In a solid, particles are arranged in a regular pattern and vibrate in fixed positions; in a liquid, particles are close together but can slide past one another; in a gas, particles are far apart and move freely.
6. Solids have tightly packed particles with minimal movement; liquids have particles that are close but can flow; gases have widely spaced particles that move rapidly and fill their container.
7. Temperature and pressure determine the state of matter. Higher temperatures generally cause substances to change from solid to liquid to gas; higher pressure can favor denser states like solids or liquids.
8. On the sun, matter exists as plasma due to extremely high temperatures causing atoms to ionize.
Parent Tip: Review the logic above to help your child master the concept of states of matter worksheet answer key.
