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Alloys are mixtures of two or more metals - Edexcel - GCSE Chemistry - Question 2 - 2019 - Paper 1

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Alloys are mixtures of two or more metals. (a) Alloy steels are formed when other metals are mixed with iron. Cutlery is made of stainless steel. Give two reasons w... show full transcript

Worked Solution & Example Answer:Alloys are mixtures of two or more metals - Edexcel - GCSE Chemistry - Question 2 - 2019 - Paper 1

Step 1

Give two reasons why cutlery is made of stainless steel rather than iron.

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Answer

  1. Stainless steel does not rust or corrode, ensuring that cutlery remains hygienic and visually appealing over time.

  2. Stainless steel is stronger than iron, providing enhanced durability and resistance to bending or breaking during use.

Step 2

Explain, using the information in Figure 4, why magnalium, rather than pure aluminium, is used for aircraft parts.

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Answer

  1. Magnalium has a lower density than aluminium, making it lighter which is advantageous for aircraft.

  2. Magnalium is stronger than aluminium, providing better structural integrity for aerodynamic applications.

  3. Magnalium has a higher resistance to corrosion compared to aluminium, ensuring longevity in various environmental conditions.

Step 3

Calculate the percentage by mass of magnesium in the magnalium.

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Answer

To calculate the percentage by mass of magnesium in the magnalium, use the formula:

extPercentagebyMass=(Mass of MagnesiumTotal Mass of Magnalium)×100 ext{Percentage by Mass} = \left( \frac{\text{Mass of Magnesium}}{\text{Total Mass of Magnalium}} \right) \times 100

Plugging in the values:

Percentage by Mass=(3.15 g63.0 g)×100=5.0%\text{Percentage by Mass} = \left( \frac{3.15 \text{ g}}{63.0 \text{ g}} \right) \times 100 \\ = 5.0 \%

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