Density

• What are the three common states of matter?

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

  Particles are very close and in a regular pattern
• What movement do particles in a solid exhibit?

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

  Particles are close but not in a regular pattern
• What can particles in a liquid do?

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

  Particles are very far apart and random
• What is the movement of particles in a gas?

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

  Mass for a given volume
• How is density calculated?

  Density = mass / volume
• What is the unit of density?

  Kilograms per meter cubed
• Why does a brick have a high density?

  It has lots of mass packed into its volume
• Why does polystyrene have a low density?

  It has a lower mass packed into its volume
• What is the density of a block of wood with mass 150 kg and volume 0.3 m³?

  500 kg/m³
• Why do solids usually have a high density?

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

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

  Polystyrene has a low density despite being solid
• What contributes to polystyrene's low density?

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

  The equation for calculating density
• What are the differences in particle arrangement and movement in solids, liquids, and gases?

  • Solids: Particles close, regular pattern, vibrate in place
  • Liquids: Particles close, irregular pattern, move around each other
  • Gases: Particles far apart, random pattern, move rapidly
• How does density vary among solids, liquids, and gases?

  • Solids: High density, particles closely packed
  • Liquids: High density, particles close together
  • Gases: Low density, particles far apart
• How do you calculate density using the formula?

  • Density = mass (kg) / volume (m³)
  • Units: kg/m³