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

Differentiate between metal and non-metal on the basis of their chemical properties.

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.

State two ways to prevent the rusting of iron.

Name two metals which will displace hydrogen from dilute acids, and two metals which will not.

Give reasons : Carbonate and sulphide ores are usually converted into oxides during the process of extraction.