CAIE IGCSE Physics Gases and Absolute Temperature

Practise gas pressure, volume and Kelvin temperature relationships using particle explanations, proportional reasoning and p₁V₁ = p₂V₂ calculations.

[Maximum number: 8]

(a)

The lowest possible temperature is zero kelvin ( 0 K ).

[ 2 ]

(i)

Nitrogen boils at 77 K .

Calculate the boiling point of nitrogen on the Celsius scale.
boiling point = ${ }^{\circ} \mathrm{C}[2]$

[ 2 ]

$-196\left({ }^{\circ} \mathrm{C}\right)$

A2

(absolute zero / 0 K ) $=-273\left({ }^{\circ} \mathrm{C}\right)$

C1

(b)

The temperature of a fixed mass of gas at constant volume changes from 300 K to 400 K .

State and explain, in terms of particles, the effect on the pressure of the gas.
statement
explanation

[ 4 ]

(c)

A sample of gas is at a pressure of 120 kPa . The volume of the gas is doubled at constant temperature.

Calculate the new pressure of the gas.
pressure =

[ 2 ]

(pressure =) 60 kPa OR $6.0 \times 10^{4} \mathrm{~Pa}$

A2

$p_{1} V_{1}=p_{2} V_{2}$ OR $\left(p_{2}=\right) p_{1} V_{1} / V_{2}$ OR p V= constant

OR $p \propto 1 / V$ OR $1.2 \times 10^{5} \times 0.5$ OR $6.0 \times 10^{n}$

C1

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CAIE IGCSE Physics Gases and Absolute Temperature

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2.1.3 Gases and the absolute scale of temperature question 1

Question (a)

Question (i)

Question (b)

Question (c)