Physical Properties, Chain Length, and Branched Groups (Grade 12 NSC Matric Physical Sciences): Quizzes
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10 questions from this quiz
What is the general formula for alkanes?
What is the general formula for alkanes?
How do Van der Waals forces change as molecules get larger?
How do Van der Waals forces change as molecules get larger?
They become stronger
What happens to boiling points as alkane chain length increases?
What happens to boiling points as alkane chain length increases?
They increase
At 25°C, alkanes with how many carbon atoms exist as gases?
At 25°C, alkanes with how many carbon atoms exist as gases?
1-4 carbon atoms
How does branching affect the boiling point of alkanes?
How does branching affect the boiling point of alkanes?
Decreases boiling point
Which pentane isomer has the highest boiling point?
Which pentane isomer has the highest boiling point?
Pentane (straight chain)
Arrange in order of increasing boiling point: methane, hexane, butane, octane.
Arrange in order of increasing boiling point: methane, hexane, butane, octane.
methane<butane<hexane<octane
Why do straight-chain alkanes have higher bp than branched isomers?
Why do straight-chain alkanes have higher bp than branched isomers?
They pack closely, max contact
What happens to water solubility as alkane chain length increases?
What happens to water solubility as alkane chain length increases?
Decreases
Why is butane a gas at room temp whilst octane is a liquid?
Why is butane a gas at room temp whilst octane is a liquid?
Butane has weaker Van der Waals