A Level Chemistry 2017 Paper 1 Question 5 Solution
In this video we want to discuss 2017 A Level H2 Chemistry Paper 1 Question 5.
Let's take a look at the question.
Topic tested is on Gaseous State.
For this question we want to use the Ideal Gas Equation to explain why a gas will liquefy under high pressure.
The most important formula in Gasesous State is the Ideal Gas Equation PV = nRT where:
P is pressure in Pa,
V is volume in m3,
n is moles of gas,
R is gas constant 8.31 J K-1 mol-1, and
T is temperature in K.
Using this equation we can predict changes in state of a gas when another state changes.
1. At constant temperature, pressure will increase when volume decrease (Boyle's Law)
2. At constant pressure, volume will increase when temperature increase (Charles' Law).
When pressure increase the temperature should also increase based on the Ideal Gas Equation so option A is not true.
When pressure increase, temperature increases which means the kinetic energy of molecules should also increase since KE is directly related to temperature.
Therefore option B is not true.
Increasing pressure will bring the molecules closer together but cannot change the size of the molecules.
Therefore option C is not true.
Increasing pressure will bring the molecules closer together so intermolecular forces get more effective and stronger.
This statement makes the most sense hence option D is our best answer.
Check out this video for the question and the suggested solution!
Topic: Gaseous State, Physical Chemistry, A Level Chemistry, Singapore
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