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Question 11

Which of the following incorrectly describes reactions of metals with water?

(A) Most metals react with cold water to produce a metal hydroxide and hydrogen gas. ←
(B) Alkali metals react with cold water to produce a base and hydrogen gas.
(C) Aluminium, zinc and iron react with steam to produce metal oxide and hydrogen gas.
(D) Magnesium reacts with hot water to produce metal oxide and hydrogen gas.

Question 12

Write the word and balanced chemical equations for the reactions of the following metals:

(a) Potassium with water

Potassium and water react to produce potassium hydroxide and hydrogen 2K(s) + 2H2O(l) = 2KOH(aq) + H2(g) ↙

(b) Calcium with water

Calcium and water react to produce calcium hydroxide and hydrogen
Ca(s) + 2H2O(l) = Ca(OH)2(s) + H2(g) ↙

(c) Aluminium with steam

Aluminium reacts with steam to produce aluminium oxide and hydrogen
2Al(s) + 2H2O(g) = Al2O3(s) + 3H2(g) ↙

Question 13

Steam trains use coal to heat water in large boilers to produce the steam needed to turn the wheels. Why would it be unwise to make these boilers of iron?

Iron reacts with water to produce iron oxide and hydrogen. The container would rust and hydrogen gas would also be produced. ↙