Page 11 - ACE YR IGCSE A TOP APPROACH TO CHEM

(g) If hydrochloric acid is replaced by ammonia, what will happen?

[2]
[Total: 10]

Clone Oct / Nov 2010
7 Nitrogen is a gas at room temperature. It is used in packaging food.
Penerbitan Pelangi Sdn Bhd. All Rights Reserved.
(a) Compare the movement and arrangement of the molecules in solid nitrogen to those in
nitrogen gas.

[3]

(b) Nitrogen gas is flushed into the container and sealed to preserve food.
Use the kinetic theory to explain why the pressure inside the container increases when
the temperature is increased.

[3]
(c) A syringe can be used to measure the rate of diffusion of gases.

Gas
Constant
Gas escapes pressure
through a small applied
hole in the foil
Gas syringe
The results are shown in the table below.

gas temperature / °C rate of diffusion in cm /min
3
chlorine 25 0.63

nitrogen 25 1.00
nitrogen 50 1.05

(i) Why does nitrogen gas diffuse faster than chlorine gas?

[2]

(ii) Nitrogen gas diffuses faster at higher temperatures. Explain why.

[1]
[Total: 9]

Cambridge IGCSE TM
8 Ace Your Chemistry

Chapter 1.indd 8 3/4/22 11:57 AM