CHEMISTRY PUZZLE

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Across
  1. 2. Group VII elements are known as ___________________ (plural)
  2. 3. A black solid that is found in Group VII
  3. 6. Lead (II) __________ is always soluble.
  4. 8. Gas that turns red litmus blue
  5. 12. A particle that is found in the nucleus of an atom and is positive in charge.
  6. 13. An oxide that does not react with HCl or NaOH
  7. 15. When barium chloride reacts with sulfuric acid, a white of barium _______________ is formed.
  8. 18. A substance that releases H+ ion as the only positive ion in water
  9. 19. Covalent molecules have a low b.p because they have weak _______________ forces between molecules.
  10. 20. Sodium chloride has an ionic ______________________ structure.
Down
  1. 1. A particle that has the same number of proton but different nucleon number.
  2. 4. Main impurity in the extraction of iron
  3. 5. Metal ______________ + Acid --> Salt + Water+ Carbon dioxide
  4. 7. _____________ salt + Alkali --> Salt + Water + Ammonia
  5. 9. An oxide that can react with both HCl and NaOH
  6. 10. Methane has a simple ____________________ structure.
  7. 11. Gas that extinguishes a lighted splint with a 'pop' sound
  8. 14. A base that is soluble in water
  9. 16. Ore that contain mainly iron
  10. 17. Compound that is formed to removed the main impurity in the blast furnace