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1.1 A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes

1.1 A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes

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Question 1
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This question is about tantalum and its extraction.

a.

Tantalum is a transition metal. Match each property of tantalum to the correct reason for that property.

Properties:

  • Conducts electricity
  • High melting point

Reasons:

  • Tantalum has delocalised electrons
  • Tantalum has layers of atoms which can slide
  • Tantalum has strong metallic bonds
  • Tantalum has weak intermolecular forces
  • Tantalum has a random arrangement of atoms
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b.

Tantalum can be mixed with other metals to make superalloys. What is meant by an 'alloy'?

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c.

Coltan is an ore containing tantalum pentoxide. Coltan contains between 15%15\%15% and 40%40\%40% tantalum. Pure tantalum pentoxide always contains 82%82\%82% tantalum. How does this show that coltan is a mixture and not a compound?

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d.

In one stage of tantalum extraction, potassium heptafluorotantalate, K2TaF7\text{K}_2\text{TaF}_7K2​TaF7​, is used. Give the total number of atoms in the formula K2TaF7\text{K}_2\text{TaF}_7K2​TaF7​.

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e.

A sample of coltan ore contains 28%28\%28% tantalum. Calculate the maximum mass of tantalum that can be extracted from 350,000 kg350,000\text{ kg}350,000 kg of this sample of coltan. Give your answer in standard form.

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Markscheme

1.1 A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes Questions

  1. GCSE
  2. /Chemistry
  3. /1.1 A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes

41 exam-style questions on AQA GCSE Chemistry 1.1 A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes, covering 1.1.1 Atoms, elements and compounds, 1.1.2 Mixtures, 1.1.3 The development of the model of the atom (common content with physics), 1.1.4 Relative electrical charges of subatomic particles, 1.1.5 Size and mass of atoms, 1.1.6 Relative atomic mass, and 1.1.7 Electronic structure. Each one has a worked solution and a mark scheme showing where the marks go.

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