CAIE IGCSE Chemistry Metals with Acids Water Steam and Oxygen

Practise predicting metal reactions with dilute acids, cold water, steam and oxygen, including products, balanced equations and observable evidence.

Exam points

predict salt and hydrogen when a suitable metal reacts with a dilute acid
distinguish cold-water hydroxide formation from steam reactions that form a metal oxide
predict metal oxide formation in oxygen and write a balanced combustion equation

[Maximum number: 2]

Iron is a transition element. Potassium is a Group I element.

Chemical properties of some Group I elements are shown in the table.

Write the chemical equation for the reaction of sodium with oxygen.

$4 \mathrm{Na}+\mathrm{O}_{2} \rightarrow 2 \mathrm{Na}_{2} \mathrm{O}$ $\mathrm{Na}_{2} \mathrm{O}$ (1) correct equation (1)

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