Chemical Basis of Life

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Across
  1. 3. The control centre of the cell
  2. 7. A pure substance that cannot be broken down into simpler substances
  3. 8. A reaction in which complex chemical structures are broken down into simpler molecules
  4. 11. A bond between two or more atoms where electrons are shared
  5. 12. A negatively charged atom formed by the gaining of one or more electrons
  6. 13. A bond between a metal and a non-metal where electrons are transferred
  7. 14. Is formed when two or more elements are joined by chemical bonds
  8. 16. An atom with the same number of protons, but a different number of neutrons
  9. 18. The material of which things are made
  10. 19. The amount of matter in an object
Down
  1. 1. The smallest unit of life
  2. 2. A reaction in which simple substances are combined to form complex chemical structures
  3. 4. The ability to do work, measured in joules(J)
  4. 5. Two or more atoms bonded together
  5. 6. A positively charged atom formed by the loss of one or more electrons
  6. 9. The sum of all chemical reactions that occur within cells
  7. 10. The atomic number of an atom represents the amount of this
  8. 15. Electrons are found in this
  9. 17. The smallest particle of matter