density

• What are the three common states of matter?

  Solids, liquids, and gases
• How are particles arranged in a solid?

  Particles are very close together in a regular pattern
• What is the movement of particles in a solid?

  Particles vibrate but do not move from place to place
• How are particles arranged in a liquid?

  Particles are close together but not in a regular pattern
• What is the movement of particles in a liquid?

  Particles can move around each other
• How are particles arranged in a gas?

  Particles are very far apart and not arranged in any pattern
• What is the movement of particles in a gas?

  Particles are moving very rapidly
• What does density tell us about a material?

  It tells us the mass for a given volume
• How is density calculated?

  Density equals mass divided by volume
• What is the unit of density?

  Kilograms per meter cubed
• Why do solids usually have a high density?

  Particles are packed closely together
• Why do liquids usually have a high density?

  Particles are close together
• Why do gases have a low density?

  Particles are very far apart
• What is an exception to the density rules for solids?

  Polystyrene has a low density despite being a solid
• Why does polystyrene have a low density?

  It has a very open structure with air spaces
• What should you learn for the exam regarding density?

  You need to learn the density equation
• What are the differences in density between different states of matter?

  • Solids: High density, particles closely packed
  • Liquids: High density, particles close together
  • Gases: Low density, particles far apart