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BECE Science 2019 Paper

Question : 9

Total: 40

Solution:

Concept:

A chemical equation is balanced when the number of atoms of each element is the same on both sides.

Explanation:

Check option D:

Left side:

\mathrm{N}_2 + 3\mathrm{H}_2

Nitrogen atoms:

2

Hydrogen atoms:

3 \times 2 = 6

Right side:

2\mathrm{NH}_3

Nitrogen atoms:

2

Hydrogen atoms:

2 \times 3 = 6

Both sides have equal atoms of nitrogen and hydrogen.

Answer:

\mathrm{N}_2 + 3\mathrm{H}_2 \rightarrow 2\mathrm{NH}_3

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