Test Index

BECE Science 2018 Paper

Question : 37

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:

\mathrm{H}_2 + \mathrm{Cl}_2 \rightarrow 2\mathrm{HCl}

Left side:

2

hydrogen atoms and

2

chlorine atoms.

Right side:

2\mathrm{HCl}

gives

2

hydrogen atoms and

2

chlorine atoms.

Both sides are equal, so the equation is balanced.

Answer:

\mathrm{H}_2 + \mathrm{Cl}_2 \rightarrow 2\mathrm{HCl}

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