POK 1 Crossword- Marian Qiqieh

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Across
  1. 1. scale The measure of acidity or alkalinity in a substance.
  2. 2. itself and still have the properties of that substance.
  3. 5. The smallest particle of a compound which can normally exist
  4. 6. An ion with a positive electric charge. An atom which has lost one or more electrons.
  5. 9. A substance which contains hydrogen that can be replaced by a metal in solution, it turns litmus red.
  6. 12. reaction A chemical reaction that gives off energy
  7. 14. The way chemists write down chemical reactions,
  8. 15. the substances formed as a result of a chemical change,
  9. 17. reaction A chemical reaction that takes in energy
  10. 18. A substance which alters the speed of a chemical reaction but remains chemically unchanged itself at the end of the reaction.
  11. 19. substances that undergo chemical change
  12. 20. energy The energy needed for a reaction to occur
  13. 22. A charged particle, an atom or group of atoms which has lost or
Down
  1. 1. A solid which forms and settles in a solution
  2. 2. A substance which reacts with an acid to form a salt and water.
  3. 3. compound A compound made up of molecules: the molecules
  4. 4. of atoms that are linked by sharing electrons.
  5. 7. electrons
  6. 8. compound A compound made up of ions.
  7. 10. combined.
  8. 11. A way of describing the composition of a substances , using symbols and numbers
  9. 13. A substance containing two or more elements which have been
  10. 16. The removal of acidity or alkalinity in a substance.
  11. 21. An ion with a negative electric charge. An atom which has gained one or more electrons.