Carbon can exist in a number of different structures - AQA - GCSE Chemistry Combined Science - Question 4 - 2021 - Paper 1

Graphite has delocalised electrons that carry electrical charge through the structure. This allows the electrons to move freely, enabling the conduction of electricity.

Steel is harder than iron because carbon atoms have different sizes compared to iron atoms. The presence of carbon distorts the layers of iron atoms, preventing them from sliding easily over each other, which increases hardness.

To find the mass of iron in the stainless steel fork:

1. Calculate the total mass of the fork using the percentage of iron:

   ext{mass of fork} = rac{X}{71.92} imes 100

2. By rearranging and substituting known values:

   X = rac{16.29 imes 100}{28.08} = 58.01 ext{ g}

3. Therefore, the mass of iron (X) in the fork is:

   ext{mass of iron} = rac{71.92 imes 58.01}{100} = 41.72 ext{ g}

Final answer: X = 41.72 g.