IB DP Physics Mock Exam HL Paper 1B Set 1 - 2025 Syllabus
IB DP Physics Mock Exam HL Paper 1B Set 1
Prepare for the IB DP Physics Mock Exam HL Paper 1B Set 1 with our comprehensive mock exam set 1. Test your knowledge and understanding of key concepts with challenging questions covering all essential topics. Identify areas for improvement and boost your confidence for the real exam
Question
Pressure \(p\), volume \(V\) and temperature \(T\) are measured for a fixed mass of gas. \(T\) is measured in degrees Celsius. The graph shows the variation of \(p V\) with \(T\). The mass of a molecule of the gas is \(4.7 \times 10^{-26} \mathrm{~kg}\).
(a) State the unit for \(p V\) in fundamental SI units.[1]
(b) Deduce, using the graph, whether the gas acts as an ideal gas.[3]
(c) Calculate, in g, the mass of the gas.[3]
▶️Answer/Explanation
Ans:
a\(\mathrm{kg} \mathrm{m}^2 \mathrm{~s}^{-2} \checkmark\)
b ALTERNATIVE 1
Graph shown is a straight line/linear
OR
expected graph should be a straight line/linear
If ideal then \(T\) intercept must be at \(T=-273^{\circ} \mathrm{C}\)
Use of \(y=m x+c\) to show that \(x=-273^{\circ} \mathrm{C}\) when \(y=0\) v (hence ideal)
ALTERNATIVE 2
Calculates \(\frac{p V}{T}\) for two different points \(\checkmark\)
Obtains \(1.50 \ll \mathrm{J} \mathrm{K}^{-1}\) w for both \(\checkmark\)
States that for ideal gas \(\frac{p V}{T}=n R\) which is constant and concludes that gas is ideal \(\checkmark\)
c.Use of \(n=\frac{p V}{R T}\) OR \(N=\frac{p V}{k T} \checkmark\)
Mass of gas \(=n \times N_{\mathrm{A}} \times\) mass of molecule
OR
Mass of gas \(=N \times\) mass of molecule
\(5.1 \ll g n \checkmark\)