Chemistry 9701/22 — October/November 2018
Cambridge AS Level · AS Level Structured Questions · worked solutions for every part, with the mark scheme
Topics Atomic Structure · Chemical Bonding · Atoms, Molecules and Stoichiometry · Chemical Energetics · States of Matter · Chemical Periodicity · +9 more
The model of the nuclear atom was first proposed by Ernest Rutherford. He developed this model on the basis of results obtained from an experiment using gold metal foil.
Complete the table with information for two of the particles in an atom of .
| particle | relative mass | relative charge | location within atom | total number in an atom of |
|---|---|---|---|---|
| electron | 0.0005 | 79 | ||
| neutron | nucleus |
State the type of bonding in gold.
A sample of gold found in the earth consists of only one isotope.
Explain what is meant by the term isotopes.
A different sample of gold contains more than one isotope.
Suggest why this different sample of gold has the same chemical properties as the sample found in the earth.
Tumbaga is an alloy of copper and gold. A sample of tumbaga was analysed. The mass spectrum of the sample is shown.
Calculate the percentage abundance of gold, , in the sample of tumbaga.
Calculate the relative atomic mass, , of the copper present in this sample.
Give your answer to two decimal places.
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