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WAEC Chemistry 2012 Paper

Question : 36

Total: 44

Consider the following reaction equation: C

_{16}

_{34}

→ C

_5

_{12}

+ C

_{11}

_{22}

. The process represented by the equation is

cracking
fermentation
polymerization
reforming

Validate

Solution:

Concept:

Cracking breaks a large hydrocarbon into smaller, more useful hydrocarbons.

Explanation:

The equation shows one large alkane,

\mathrm{C}_{16}\mathrm{H}_{34}

, splitting into two smaller molecules:

\mathrm{C}_5\mathrm{H}_{12}

and

\mathrm{C}_{11}\mathrm{H}_{22}

This breakdown of a heavier hydrocarbon into lighter hydrocarbons is the process called cracking.

Fermentation uses microorganisms, polymerization joins small molecules, and reforming rearranges molecules without breaking them into smaller products.

Therefore, the reaction represents cracking.

Answer:

A. cracking

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