An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be
carbon
calcium
silicon
iron
Give reasons : Platinum, gold and silver are used to make jewellery.
You are given a hammer, a battery, a bulb, wires and a switch.
$(a)$ How could you use them to distinguish between samples of metals and non-metals ?
$(b)$ Assess the usefulness of these tests in distinguishing between metals and non-metals.
In the electrolytic refining of a metal $M$, what would you take as the anode, the cathode and the electrolyte ?
Write equations for the reactions of
$(i)$ iron with steam
$(ii)$ calcium and potassium with water
What would you observe when zinc is added to a solution of iron $(II) $ sulphate ? Write the chemical reaction that takes place.