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
Why do ionic compounds have high melting points ?
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.
Which gas is produced when dilute hydrochloric acid is added to a reactive metal? Write the chemical reaction when iron reacts with dilute $H_2SO_4$.
Which of the following methods is suitable for preventing an iron frying pan from rusting ?
Which metals do not corrode easily ?