Q1 of 10 Page 69

Some apparatus and chemicals are given.

Zn, Mg, dilute HCl, CaCO3, test tube, water


a) Design an experiment to prove that the nature of reactants can influence the rate of reaction.


b) Write the equations for the chemical reactions.


c) Write the expression for the rate of the reaction.

a) Experiment-1- When Mg react with dilute HCl in test tube then hydrogen gas will evolve.

Experiment-2- When Zn react with dilute HCl in a test tube then hydrogen gas will evolve.


The reaction of Mg with dilute HCl will occur faster than the reaction of Zn with dilute HCl. The Mg is more reactive than Zn because Mg is above to Zn in reactivity series. So, the nature of reactants can influence the rate of reaction.


b) Mg + 2HCl MgCl2 + H2


Zn + 2HCl ZnCl2 + H2


c) Rate of reaction = Amount of reactants used


Time is taken for consumption of the reactant


Rate of reaction = ______Amount of product formed_______


Time is taken for the formation of the product


More from this chapter

All 10 →
5

2NO(g) + O2(g) ⇋ 2NO2(g) + heat

In this reaction how do the following changes influence the amount of the product?


a) Decrease in temperature


b) Increase in pressure


c) Increase in the concentration of oxygen

 6

N2(g) + 3H2(g) ⇋ 2NH3(g) + heat

a) In this reaction what happens to the volume when the reactants change to the products?


b) What change in pressure is required for the maximum yield of the product?


c) What is the change in the concentration required for increasing the rate of the forward reaction?


d) What is the catalyst used in this reaction? What is its effect?

 2

The graph for the reaction N2 (g) + 3H2 (g) ⇋ 2NH3 (g) + heat is given below.


a. Identify and write the reactions C and D.


b. What happens to the position of point A in the graph when a catalyst is used? Redraw the graph accordingly.

 3

The experiments conducted by two students are given below.

Experiment - 1


2 mL of sodium thiosulphate solution is taken in a test tube, heated and to it, 2 mL of HCl solution is added.


Experiment - 2


2 mL of sodium thiosulphate solution is taken in a test tube and to it, 2 mL of HCl solution is added.


a) In which experiment is the precipitate formed first? Justify your answer.


b) Write the balanced equation for the reaction.