Puzzle 4

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Across
  1. 2. bacterium found in soil that helps in fixing nitrogen in leguminous plants
  2. 6. Hepatitis is a general term for a disease that is caused by
  3. 9. positive catalyst ------ the rate of reaction in a chemical reaction
  4. 10. Impure camphor is purified by
  5. 12. ray with the highest penetrating power?
  6. 14. Which element is found in the highest amount in the universe?
  7. 17. ____ is a drug or substance that makes you feel relaxed and makes your body work and react more slowly.
  8. 18. Purest form of iron?
  9. 19. NaHCO3 is chemical formula for ___________.
Down
  1. 1. What is the mass number of an element, the atom of which contains two Protons, two neutrons and two electrons?
  2. 3. ------ systems of the body primarily attacked by the HIV?
  3. 4. Which organ of the body produces the fluid known as bile?
  4. 5. Edward Jenner started ------
  5. 7. If the pH value of a substance is lower than 7, it would be considered as ----
  6. 8. ----- Power is the clean source of energy
  7. 10. In which part of the body does digestion of protein starts?
  8. 11. Sodium silicate is the chemical name of which mineral
  9. 13. ------- hardness of water may be removed by the addition of sodium carbonate
  10. 15. What is the unit of Curie?
  11. 16. Brain and the spinal cord are invested by membranes called: