This question is about metals and metal compounds. 02.1 Iron pyrites is an ionic compound. Figure 1 shows a structure for iron pyrites. Determine the formula of iron pyrites. Use Figure 1. 02.2 An atom of iron is represented as $^{56}_{26}Fe$ Give the number of protons, neutrons and electrons in this atom of iron. Number of protons Number of neutrons Number of electrons 02.3 Iron is a transition metal. Sodium is a Group 1 metal. Give two differences between the properties of iron and sodium. 02.4 Nickel is extracted from nickel oxide by reduction with carbon. Explain why carbon can be used to extract nickel from nickel oxide. 02.5 An equation for the reaction is: NiO + C → Ni + CO Calculate the percentage atom economy for the reaction to produce nickel. Relative atomic masses (A): C = 12 Ni = 59 Relative formula mass (M): NiO = 75 Give your answer to 3 significant figures.

GCSE AQA Chemistry Yield & Atom Economy: This question is about metals an

This question is about metals and metal compounds - AQA - GCSE Chemistry - Question 2 - 2018 - Paper 1

Question 2

This question is about metals and metal compounds. 02.1 Iron pyrites is an ionic compound. Figure 1 shows a structure for iron pyrites. Determine the formula of ... show full transcript

Worked Solution & Example Answer:This question is about metals and metal compounds - AQA - GCSE Chemistry - Question 2 - 2018 - Paper 1

Step 1

Determine the formula of iron pyrites.

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Answer

The formula for iron pyrites is $FeS_2$ . This compound consists of one iron (Fe) atom and two sulfur (S) atoms.

Step 2

Number of protons

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Answer

The number of protons in an atom of iron is 26.

Step 3

Number of neutrons

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Answer

The number of neutrons in an atom of iron is 30.

Step 4

Number of electrons

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Answer

The number of electrons in an atom of iron is 26.

Step 5

Give two differences between the properties of iron and sodium.

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Answer

Iron has a higher melting and boiling point than sodium, making it more suitable for structural applications.
Iron is stronger and denser compared to sodium, which is softer and lighter.

Step 6

Explain why carbon can be used to extract nickel from nickel oxide.

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Answer

Carbon can be used to extract nickel from nickel oxide because it is more reactive than nickel. During the reduction process, carbon displaces nickel from nickel oxide by removing oxygen, thereby allowing the nickel to be recovered.

Step 7

Calculate the percentage atom economy for the reaction to produce nickel.

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Answer

To calculate the percentage atom economy:

Determine the total molar mass of the reactants:
Molar mass of NiO = 75 g/mol + Molar mass of C = 12 g/mol = 87 g/mol.
The molar mass of the desired product (nickel) is 59 g/mol.
Apply the atom economy formula:

$ext{Percentage Atom Economy} = \left( \frac{\text{Molar mass of desired product}}{\text{Total molar mass of reactants}} \right) \times 100$

$= \left( \frac{59}{87} \right) \times 100 \approx 67.68\%$

Thus, the percentage atom economy is approximately 67.7% when rounded to three significant figures.

This question is about metals and metal compounds - AQA - GCSE Chemistry - Question 2 - 2018 - Paper 1

Worked Solution & Example Answer:This question is about metals and metal compounds - AQA - GCSE Chemistry - Question 2 - 2018 - Paper 1

Determine the formula of iron pyrites.

Number of protons

Number of neutrons

Number of electrons

Give two differences between the properties of iron and sodium.

Explain why carbon can be used to extract nickel from nickel oxide.

Calculate the percentage atom economy for the reaction to produce nickel.

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