Question

1. Why are iron rims heated red hot before fixing them on cart wheels?
2. Write a balanced chemical equation for reaction between calcium hydroxide and sulphric acis

Answer 1

Answer:

1. So that it could stay there properly

2. $H_{2} SO_{4} + Ca(OH)_{2} ---> CaSO_{4} + H_{2}O$

Explanation:

1. When iron is heated red hot it expands and when it cools down it contract or shrink. That is why iron rims are heated so that when they shrink they become tight and do not gets away from car wheels

Answer 2

Explanation:

1)Iron rims are made slightly smaller than the wheels. They are heated red hot before fixing them on the cart wheels to expand them so that they can be easily fixed on the wheels and water is poured on them to cool them. As the rims cool they contract and take the shape of the wheel and get firmly fixed on the wheels.

2)The balanced chemical equation for the reaction between Sulphuric Acid (H2SO4) and Calcium Hydroxide (Ca(OH)2) will be as follows:

The balanced chemical equation for the reaction between Sulphuric Acid (H2SO4) and Calcium Hydroxide (Ca(OH)2) will be as follows:H2SO4 + Ca(OH)2 -> Ca SO4 +2 H2O

The balanced chemical equation for the reaction between Sulphuric Acid (H2SO4) and Calcium Hydroxide (Ca(OH)2) will be as follows:H2SO4 + Ca(OH)2 -> Ca SO4 +2 H2OOne molecule of Sulphuric Acid and one molecule of Calcium Hydroxide will react to give one molecule of Calcium Sulphate and two molecules of Water.