CHEMISTRY PUZZLE

2. Group VII elements are known as ___________________ (plural)
3. A black solid that is found in Group VII
6. Lead (II) __________ is always soluble.
8. Gas that turns red litmus blue
12. A particle that is found in the nucleus of an atom and is positive in charge.
13. An oxide that does not react with HCl or NaOH
15. When barium chloride reacts with sulfuric acid, a white of barium _______________ is formed.
18. A substance that releases H+ ion as the only positive ion in water
19. Covalent molecules have a low b.p because they have weak _______________ forces between molecules.
20. Sodium chloride has an ionic ______________________ structure.

1. A particle that has the same number of proton but different nucleon number.
4. Main impurity in the extraction of iron
5. Metal ______________ + Acid --> Salt + Water+ Carbon dioxide
7. _____________ salt + Alkali --> Salt + Water + Ammonia
9. An oxide that can react with both HCl and NaOH
10. Methane has a simple ____________________ structure.
11. Gas that extinguishes a lighted splint with a 'pop' sound
14. A base that is soluble in water
16. Ore that contain mainly iron
17. Compound that is formed to removed the main impurity in the blast furnace