5105 Kinetic Particle Theory

Edit Answers
123456789101112131415161718192021222324252627
Across
  1. 2. particles in a solid are very closely-packed and ___ arranged
  2. 3. particles in a liquid are closely-packed and ___ arranged
  3. 6. process where a solid changes into a liquid on heating
  4. 7. solids and liquids are ___ due to the close packing of particles resulting in large numbers of particles per unit volume
  5. 8. solids have a ___ shape and volume
  6. 10. particles in a solid ___ about their fixed positions
  7. 12. during melting or boiling, heat energy taken in is used to ___ forces of attraction holding particles together
  8. 14. particles in a gas are very __ and randomly arranged (2 words)
  9. 17. particles in a gas have high ___ energy, hence move quickly in all directions
  10. 18. during freezing or condensation, heat energy is ____ as particles slow down and come closer together
  11. 19. when particles come closer together, forces of attraction between them become ___
  12. 23. temperature remains ___ during melting or boiling
  13. 24. the state of oxygen at​ -220°C (melting point of oxygen -219 °C, ​boiling point −183 °C)
  14. 25. solids and liquids cannot be compressed because ___ empty space exist between particles
  15. 27. the state of matter in which particles are held together by very strong forces of attraction
Down
  1. 1. process where a gas changes into a liquid
  2. 4. large spaces between particles in a gas allows the particles to move closer together when a gas is ___
  3. 5. the state of iron at 1580°C (melting point of iron, 1538°C, ​boiling point, 2862°C)
  4. 9. ___ takes place at the surface of a liquid at temperatures below its boiling point
  5. 11. gases expand greatly in volume with a small rise in temperature as very ____ forces of attraction between particles are easily overcome
  6. 13. during ___, particles in a liquid loses energy and come closer together
  7. 15. during boiling, all particles in a liquid ___ energy to overcome forces of attraction
  8. 16. changes of states are physical changes which are ___
  9. 20. particles in a gas move ___ in all directions at high speeds
  10. 21. liquids have a fixed ___ but takes the shape of its container
  11. 22. particles in a liquid are constantly ___ and exchanging positions
  12. 26. the Kinetic Particle theory states that all matter is made up of ___ particles (i.e. atoms, molecules and ions) that are in constant and random motion