Question

7. Write the chemical equation in words,
and then using chemical formulae, for the
chemical change that occurs when iron nails
are dipped in copper sulphate solution.
8. How can browning of the cut surfaces of
some fruits and vegetables be prevented?​

Answer 1

Explanation:

Fe(s)+CuSO

4

⟶Cu(s)+FeSO

4

When an iron nail is dipped in copper sulphate solution, a brown coating of copper is formed on the surface of iron and the colour of copper sulphate solution changes from blue to light green. This reaction shows that iron is more reactive than copper as it displaces copper from its solution and iron passes into solution as Fe

2+

ions and ferrous sulphate solution is formed.

Answer 2

Answer:

7.Fe+ CuSO4 — FeSO4+ Cu

8. Keep cut fruits, such as apples, pears, bananas and peaches, from turning brown by coating them with an acidic juice such as lemon, orange or pineapple juice. Or use a commercial anti-darkening preparation with fruits, such as Fruit-Fresh®, and follow the manufacturer's directions.

Explanation:

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