kpt

• Solid's key properties:

  • Very strong force of attraction
  • Closely packed and orderly
  • Vibrates at its fixed positions
  • Has very low energy
• Key points about the properties of liquids:

  • Liquids have strong intermolecular forces
  • Particles in liquids are closely packed and disorderly
  • Particles in liquids can slide over each other
  • Liquids have low energy compared to gases
• Gas particles are weak, far apart, disorderly, and move at high speeds in all directions
• When a substance is heated, thermal energy is transferred to its particles
• Particles vibrate and rotate about their fixed position
• >Changes in state of matter:

  -temp of solid substance increase till melting point (kinetic energy increases, vibrate in fixed positions)

  -solids starts to melt: forces of attraction overcome by motion of particles, TEMP REMAINS CONSTANT
• -solids melts completely:temp of liquid increases till b.p, line rise, kinetic energy of particles in liquid increases,particle moves more quickly
• -temp constant: forces of attraction overcomed by motion of particles, boiling occurs

  -temp reaches gaseous state, kinetic energy in gas increases, particles move more quickly.