Hydrocarbons (Grade 12 NSC Matric Physical Sciences): Quizzes

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Hydrocarbons
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What elements do hydrocarbons contain?

Only carbon and hydrogen

What is the general formula for alkanes?

CnH2n+2C_nH_{2n+2}

Which hydrocarbon type is saturated?

Alkanes

What is the general formula for alkenes?

CnH2nC_nH_{2n}

What is the general formula for alkynes?

CnH2n−2C_nH_{2n-2}

What is the molecular formula of ethene?

C2H4C_2H_4

How does alkane reactivity compare to alkenes?

Alkanes are less reactive

What happens when unsaturated hydrocarbons react with bromine water?

Orange colour disappears

What state are alkanes with four or fewer carbons at room temperature?

Gases

In a homologous series, how do successive members differ?

By a CH2CH_2 unit

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