2P04 Answers(Done by Chairul Karim,Johny Zou Rui,Ng Sze Hian and Jesse Tan)

1. salt + hydrogen gas
2. Acid + Metal --> salt + hydrogen gas
3. Use a burning splint and if a 'pop' sound is heard, there is hydrogen gas present.
4. It is a neutral gas.
5. Magnesium, zinc,iron, copper

Exercise


1(a) magnesium + hydrochloric acid --> magnesium chloride + hydrogen gas
  (b) Mg + 2HCl --> MgCl2 + H2

2(a) iron + hydrochloric acid --> iron(II) chloride + hydrogen gas
  (b) Fe + 2HCl --> FeCl2 + H2

3(a) zinc + hydrochloric acid --> zinc chloride + hydrogen gas
  (b) Zn + 2HCl --> ZnCl2 + H2

4(a) magnesium + sulfuric acid --> magnesium sulfate + hydrogen gas
  (b) Mg + H2SO4 --> MgSO4 + H2

5(a) iron + sulfuric acid --> iron(II) sulfate + hydrogen gas
  (b) Fe + H2SO4 --> FeSO4 + H2

6(a) zinc + sulfuric acid --> zinc sulfate + hydrogen gas
  (b) Zn + H2SO4 --> ZnSO4 + H2

7(a) magnesium + nitric acid --> magnesium nitrate + hydrogen gas
  (b) Mg + 2HNO3 --> Mg(NO3)2 + H2

8(a) iron + nitric acid --> iron(II) nitrate + hydrogen gas
  (b) Fe + 2HNO3 --> Fe(NO3)2 + H2

9(a) zinc + nitric acid --> zinc nitrate + hydrogen gas
  (b) Zn + 2HNO3 --> Zn(NO3)2 + H2