ALKANES [dchemlc]

ALKANES [dchemlc]

9th Grade

10 Qs

quiz-placeholder

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ALKANES [dchemlc]

ALKANES [dchemlc]

Assessment

Quiz

Chemistry

9th Grade

Hard

Created by

Miyuni Thisanga De Almeida

FREE Resource

10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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what is the general formula of alkanes?
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Answer explanation

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2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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why are alkanes classified as saturated hydrocarbons?

because they contain C-C single bonds only

because they contain C=C double bonds only

because they contain C-C triple bonds only

because they do not have hydroxyl groups

Answer explanation

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3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

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what is the chemical formula of the given compound?

2,3-dimethylbutane

2,3-dimethylpropane

2-ethylpropane

2-methyl-3-methylbut-1-ane

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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what is the name of the alkane with 4 carbons?

butane

propane

hexane

ethane

Answer explanation

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5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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which of the following gives the formula of an alkane with 12 carbons?

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Answer explanation

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general formula of alkanes is as shown. so if n=12, 2n+2=26

therefore a carbon with 12 carbons has the formula C12H26

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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which of the following is not a gas at room temperature?

methane

butane

propane

pentane

Answer explanation

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The first four alkanes are gases at room temperature

(- 25 °C}. All the other alkanes you are likely to see at International GCSE are liquids. Solids start to appear at about C18H38

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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what happens to the boiling points of alkanes as the number of carbons increase?

boiling point increases

boiling point decreases

boiling point doesn’t change

boiling point increases then decreases

Answer explanation

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As the molecules become bigger, the strength of the intermolecular forces of attraction between them increases. This means that more energy has to be put in to break the attractions between one molecule and its neighbours. One effect of this is that the boiling points increase in a regular way.

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