CHEMISTRY

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Across
  1. 1. What is the hardest natural substance?
  2. 5. Decomposition reaction?
  3. 6. Exothermic reaction?
  4. 10. What type of bond is found in diamond?
Down
  1. 2. What is the most abundant metal in the Earth's crust?
  2. 3. Which element forms the basis of organic chemistry?
  3. 4. Which non-metal is essential for respiration?
  4. 7. What is the common name for CH₄?
  5. 8. What is the taste of acids?
  6. 9. What color does litmus paper turn in a base?