Chemistry crossword 1

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Across
  1. 2. / the connection between atoms in a molecule (noun)
  2. 3. / to make something become hot or warm, or to become hot or warm (verb)
  3. 6. / a chemical reaction in which heat is absorbed (adjective)
  4. 10. / to make clothes using wool and two long needles to join the wool into rows (verb)
  5. 11. / a hard, black substance that is dug from under the ground and burnt as fuel (noun)
  6. 12. / a dry substance made of many extremely small, loose grains (noun)
  7. 13. / an iron object that makes pieces of iron or steel move towards it (noun)
  8. 15. burner / a small device that burns gas to produce a flame which is used to heat things in scientific work and experiments (noun)
  9. 16. / an atom or small group of atoms which has an electrical charge because it has added or lost one or more electrons (noun)
  10. 17. / to make a liquid stronger or purer by heating it until it changes to a gas and then cooling it so that it changes back into a liquid (verb)
  11. 19. / to cook something in hot oil or fat or to be cooked in hot oil or fat (verb)
  12. 20. / a very small spot or a very small amount of something (noun)
Down
  1. 1. / a substance that dissolves another to form a solution (noun)
  2. 4. / to use fuel to produce heat or energy (verb)
  3. 5. / to change from a solid into a liquid because of heat (verb)
  4. 7. / a change which happens when two substances are put together (noun)
  5. 8. / a substance that is a combination of two or more elements (noun)
  6. 9. / to produce light (verb)
  7. 14. / to become less hot, or to make something become less hot (verb)
  8. 18. / a sticky sweet, made by boiling sugar and butter together (noun)