IB Chemistry HL S1.5 Ideal gases questions

Exam-style multiple choice and written questions with full markschemes. Check multiple choice answers straight away, or type, photograph or draw a written answer and get it marked.

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Question 1

Multiple choiceMedium1 mark

A fixed amount of an ideal gas has pressure $8.0 \times 10^4\ \mathrm{Pa}$ volume $6.0 \times 10^{-3}\ \mathrm{m^3}$ and temperature $300\ \mathrm{K}$ It is changed to volume $3.0 \times 10^{-3}\ \mathrm{m^3}$ and temperature $450\ \mathrm{K}$ What is its final pressure?

Show answer and explanation

Answer: D. For a fixed amount of gas, $P \propto T/V$ Thus, $P_2=P_1(V_1/V_2)(T_2/T_1)=(8.0\times10^4)(2.0)(1.5)=2.4\times10^5\ \mathrm{Pa}$

A: reverses the temperature ratio, using $T_1/T_2$ instead of $T_2/T_1$
B: accounts for the temperature increase but omits the volume decrease.
C: accounts for the volume decrease but omits the temperature increase.
Remember: at fixed amount, pressure increases with temperature and decreases with volume.

Question 2

Paper 2Medium6 marks

A chemist compares equal amounts of gaseous nitrogen at two different sets of conditions. Figure 1 shows schematic particle diagrams for the samples.

(a)

State three assumptions of the ideal-gas model.

[3]

(b)

Using Figure 1, identify the sample expected to show the greater deviation from ideal-gas behaviour.

[1]

(c)

Using Figure 1 and your knowledge of the ideal-gas model, explain how the conditions for this sample favour deviation from ideal-gas behaviour.

[2]

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