ALKANES [dchemlc]
Quiz
•
Chemistry
•
9th Grade
•
Practice Problem
•
Hard
Miyuni Thisanga De Almeida
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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
what is the general formula of alkanes?
Answer explanation
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
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
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
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
what is the name of the alkane with 4 carbons?
butane
propane
hexane
ethane
Answer explanation
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
which of the following gives the formula of an alkane with 12 carbons?
Answer explanation
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
which of the following is not a gas at room temperature?
methane
butane
propane
pentane
Answer explanation
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
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
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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