闪卡自测
What is the general formula for alkenes?
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闪卡 1
问题
What is the general formula for alkenes?
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答案
The general formula for alkenes is CnH2n.
闪卡 2
问题
What is the characteristic feature in the structure of alkenes?
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答案
All alkenes contain a double carbon bond, which is shown as two lines between two carbon atoms (C=C).
闪卡 3
问题
What is the functional group in alkenes?
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答案
The double carbon bond (C=C) is the functional group in alkenes.
闪卡 4
问题
How are alkenes named?
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答案
Alkenes are named using the same system as alkanes, with the suffix "-ene" instead of "-ane".
闪卡 5
问题
Give the name and structure of the first alkene.
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答案
The name and structure of the first alkene is ethene, CH2=CH2.
闪卡 6
问题
Define the term alkene.
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答案
An alkene is a hydrocarbon compound containing at least one carbon-carbon double bond.
闪卡 7
问题
Explain the term double bond.
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答案
A double bond is a covalent bond formed by sharing two pairs of electrons between atoms.
闪卡 8
问题
Explain the term functional group.
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答案
A functional group is the specific group of atoms responsible for the characteristic chemical reactions of a compound.
闪卡 9
问题
Explain what is meant by a unsaturated compound.
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答案
An unsaturated compound contains double or triple bonds, which can undergo addition reactions.
闪卡 10
问题
True or False? Alkenes are less reactive than alkanes due to their double bond.
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答案
False. Alkenes are more reactive than alkanes due to the presence of the carbon-carbon double bond.
闪卡 11
问题
What type of reactions do alkenes undergo?
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答案
Alkenes undergo addition reactions, where atoms of a simple molecule add across the C=C double bond.
闪卡 12
问题
What is the reaction between bromine and propene an example of?
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答案
The reaction between bromine and propene is an example of an addition reaction.
闪卡 13
问题
How does the bromine water test work?
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答案
Bromine water is orange. When added to an alkane, it remains orange. When added to an alkene, the bromine atoms add across the C=C bond, causing the solution to lose its colour.
闪卡 14
问题
What is the purpose of the bromine water test?
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答案
The bromine water test is used to distinguish between alkanes and alkenes.
闪卡 15
问题
Why do alkenes react differently from alkanes?
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答案
Alkenes can react in ways that alkanes cannot due to the presence of the carbon-carbon double bond, which contains an area of high electron density.
闪卡 16
问题
Explain what is meant by an addition reaction
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答案
A chemical reaction in which atoms or groups of atoms are added across a multiple bond, such as a carbon-carbon double bond.
闪卡 17
问题
What is bromine water?
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答案
An orange-coloured solution of bromine dissolved in water, used to test for the presence of alkenes.
闪卡 18
问题
What is a saturated compound?
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答案
A compound containing only single bonds, which cannot undergo addition reactions.
闪卡 19
问题
What is an unsaturated compound?
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答案
A n unsaturated compound contains double or triple bonds, which can undergo addition reactions.
闪卡 20
问题
True or False? The bromine water test can distinguish between propane and ethanol.
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答案
False. The bromine water test can only distinguish between alkanes and alkenes due to their different reactivity with bromine, so it can't distinguish between propane and ethanol.