Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron).
Copper does not react with cold water, hot water, or steam. However, iron reacts with steam. If the hot water tanks are made of steel (an alloy of iron), then iron would react vigorously with the steam formed from hot water.
$\underset{\text{ Iron }}{\mathop{3Fe}}\,\,+\underset{\text{ Steam }}{\mathop{\,4{{H}_{2}}O}}\,\,\to \underset{\text{ Iron(II, III) oxide }}{\mathop{\,F{{e}_{3}}{{O}_{4}}}}\,\,+\underset{\text{ Hydrogen }}{\mathop{\,4{{H}_{2}}}}\,$
That is why copper is used to make hot water tanks, and not steel.
Food cans are coated with tin and not with zinc because
Which metals do not corrode easily ?
What would you observe when zinc is added to a solution of iron $(II) $ sulphate ? Write the chemical reaction that takes place.
Which gas is produced when dilute hydrochloric acid is added to a reactive metal? Write the chemical reaction when iron reacts with dilute $H_2SO_4$.
Define the following terms.
$(i)$ Mineral $(ii)$ Ore $(iii)$ Gangue