Test Yourself 3.4 (Textbook) – Chemistry Form 4 Chapter 3 (The Mole Concept, Chemical Formula and Equation)


Question:
1. Write the chemical equations for the following reactions:
(a) Copper + Silver nitrate solution → Copper(II) nitrate solution + Silver
(b) Hot zinc metal will react with chlorine gas to produce solid zinc chloride

2. Decomposition of hydrogen peroxide, H2O2 occurs according to the following equation:

2H2O2(l) → 2H2O(l) + O2(g)

(a) What are the products of the decomposition of hydrogen peroxide, H2O2?
(b) Calculate the volume of oxygen produced at STP from the decomposition of 30.6 g of hydrogen peroxide, H2O2.


Answer:
1. (a) Cu(s) + 2AgNO3(aq) → Cu(NO3)2(aq) + 2Ag(s)
(b) Zn(s) + Cl2(g) → ZnCl2(s)

2. (a) Water and oxygen gas
(b) 10.08 dm3