Chemistry 9701/23 — May/June 2015
Cambridge AS Level · AS Level Structured Questions · worked solutions for every part, with the mark scheme
Topics Atoms, Molecules and Stoichiometry · Chemical Bonding · Introduction to Organic Chemistry · Hydrocarbons · Hydroxy Compounds · Atomic Structure · +5 more
Neon is a noble gas.
Complete the full electronic configuration of neon.
........................................................................................................................................
Explain what is meant by the term first ionisation energy.
Explain why the first ionisation energy of neon is greater than that of fluorine.
Neon has three stable isotopes.
| isotope | mass number | percentage abundance |
|---|---|---|
| 1 | 9.25 | |
| 2 | 20 | 90.48 |
| 3 | 21 | 0.27 |
Define the term relative atomic mass.
Use the relative atomic mass of neon, 20.2, to calculate the mass number of isotope 1.
mass number = .................................
A mixture of neon and argon has a mass of 0.275 g. The mixture was placed in a gas syringe at a temperature of 25 °C and a pressure of 100 kPa. Under these conditions the mixture was found to occupy a volume of 200 cm³.
Calculate the average of the mixture.
average = .................................
Use your answer to (i) to calculate the percentage of neon in the mixture.
Give your answer to three significant figures.
percentage of neon = ................................. %
Neon and argon can both be obtained by fractional distillation of liquid air as they have different boiling points.
Neon has a boiling point of 27.3 K. The boiling point of argon is 87.4 K.
Name the force that has to be overcome in order to boil neon or argon and explain what causes it.
Explain why argon has a higher boiling point than neon.
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