Noble Gases (Cambridge (CIE) O Level Chemistry): Exam Questions

For each of the following select an element from Period 4, potassium to krypton, that matches the description.

It is a brown liquid at room temperature.

It forms a compound with hydrogen having the formula XH₄.

A metal that reacts violently with cold water.

It has a complete outer energy level.

It has oxidation states of 2 and 3 only.

It can form an ion of the type X^-.

Separate: Chemistry and Extended Only

One of its oxides is the catalyst in the Contact Process.

Helium, neon, argon, krypton, xenon and radon are noble gases in Group VIII.

Name the noble gas which has the greatest volume composition in air.

State one use for helium.

Radon is very unreactive.

Use the electronic structure of radon to explain why.

Two isotopes of radon are shown.

(i) Give one similarity in the atomic structure of these two isotopes.             

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(ii) Give one difference in the atomic structure of these two isotopes.          

[1]

Xenon forms a compound that contains only xenon, oxygen and fluorine.

The compound contains 22.1% oxygen by mass and 17.5% fluorine by mass.

Calculate the empirical formula of this compound.

A sample of neon has a volume of 21 dm³ at room temperature and pressure.

(i) The temperature of the sample is increased.

The pressure remains constant.

Describe and explain, using kinetic particle theory, what happens to the volume of the sample.

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(ii) The pressure of the sample is increased.

The temperature remains constant.

Describe and explain, using kinetic particle theory, what happens to the volume of the Sample.

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(iii) Calculate the mass of neon in the 21 dm³ sample.

Give your answer to two significant figures.

[2]