11 mark
Which statement about noble gases is not correct?
☐ | A | They are diatomic |
☐ | B | They have low densities |
☐ | C | Their boiling points increase going down the group |
☐ | D | They are unreactive |
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Group 0 (Edexcel GCSE Combined Science: Chemistry): Exam Questions
13 mins6 questions
21 mark
Which of the following statements is not a correct statement about helium?
☐ | A | It is chemically inert as it has a full outer shell of electrons |
☐ | B | It is used in weather balloons as its density is lower than air |
☐ | C | Its nucleus contains 2 protons and 4 neutrons |
☐ | D | It is the lightest noble gas |
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31 mark
Argon has an atomic number of 18.
What is the electronic configuration for this atom?
☐ | A | 10.8 |
☐ | B | 18 |
☐ | C | 8.2.8 |
☐ | D | 2.8.8 |
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4a4 marks
This question is about the noble gases.
i) State, in terms of outer shell electrons, why the noble gases are unreactive.
(1)
ii) Figure 4 shows an airship, filled with helium, floating above the ground.
Figure 4
Helium, hydrogen and krypton are gases. Figure 5 shows the reactivity and density, at room temperature and pressure, of helium, hydrogen and krypton.
gas | reactivity | density in g cm–3 |
helium | unreactive | 0.00018 |
hydrogen | very reactive | 0.00009 |
krypton | unreactive | 0.00380 |
Figure 5
The density of air is 0.001225 g cm–3.
Helium is used in airships.
Explain why hydrogen and why krypton are not used in airships.
(3)
4b1 mark
Mendeleev produced one of the earliest periodic tables.
State why he could not include any of the noble gases in his periodic table.
4c3 marks
Figure 6 shows the boiling points of some of the noble gases.
noble gas | boiling point in °C |
helium | –269 |
neon | –246 |
argon | –186 |
krypton | –153 |
xenon |
|
Figure 6
i) Complete the bar chart to show the boiling points of neon and argon.
(2)
ii) Predict the boiling point of xenon.
(1) boiling point of xenon = ............................ °C
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51 mark
Argon has a boiling point of -186oC.
Which would be the best prediction of the boiling point of xenon?
☐ | A | -269 oC |
☐ | B | -108 oC |
☐ | C | 98 oC |
☐ | D | It is not possible to make a prediction |
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61 mark
Which of the following lists four noble gases in order of increasing density?
☐ | A | xenon, krypton, argon, neon |
☐ | B | hydrogen, helium, neon, argon |
☐ | C | helium, neon, krypton, argon |
☐ | D | helium, argon, xenon, radon |
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