Question 18
FThe graph shows the order of boiling points of five noble gases. It has no numerical temperature scale. Consider a gas mixture containing helium, neon and argon at a fixed pressure, initially above all three boiling points.
a.[3]
The mixture is cooled slowly without freezing any liquid that forms. Use the graph to state the order in which these three gases begin to condense. Explain your reasoning.
b.[2]
A technician wants argon to be liquid while neon and helium remain gases. Describe where the temperature must lie relative to the boiling points shown. Explain why an exact numerical operating temperature cannot be obtained from this graph.
c.[3]
Explain why helium and argon are both unreactive even though helium has only two electrons in its outer shell. State why argon can protect a hot metal during welding.
7.3 Group 0 Questions
38 exam-style questions on Edexcel GCSE Chemistry 7.3 Group 0, covering 7.3.1 The noble gases. Each one has a worked solution and a mark scheme showing where the marks go.