Chemistry

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Across
  1. 2. / The centre of an atom that contains protons and neutrons
  2. 5. / Compound that dissolves in water
  3. 6. / H20
  4. 9. / Measures heat
  5. 11. of a reaction/ products are formed during chemical reactions as reagents are consumed
  6. 13. / Element of an atom
  7. 14. / A chemical process where two substances interact to form a new substance
  8. 15. of conservation of mass / that the atoms of an object cannot be created or destroyed but can be moved around and be changed into different particles.
  9. 16. Reaction / When two substances react
  10. 19. / The negatively charged part of an atom
  11. 20. / An expression in which symbols and formulae represent a chemical reaction
Down
  1. 1. / particles that fill their container though have no definite shape or volume
  2. 3. / A substance made up of one kind of atom; it cannot be broken down
  3. 4. / Energy in the form of waves
  4. 7. / Absorbing heat
  5. 8. / A new substance produced by a chemical reaction
  6. 10. / Giving off heat
  7. 12. / A substance that reacts with another
  8. 17. / The smallest unit of an element
  9. 18. / A substance made up of two or more elements chemically combined