NChem_Chapter 16 Alkanes and Alkenes
Quiz
•
Chemistry
•
8th Grade
•
Practice Problem
•
Hard
Mavis Teo
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12 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the name of this molecule?
methane
ethene
butene
butane
Answer explanation
1C-meth
2C-eth
3C-prop
4C-but
2.
MULTIPLE SELECT QUESTION
1 min • 2 pts
Which two hydrocarbons are alkanes?
(Hint: the general formula for alkanes is CnH2n+2)
C2H6
C3H8
C5H12
C10H42
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following molecules has the highest boiling point?
CH4
C2H6
C6H14
C14H28
4.
FILL IN THE BLANK QUESTION
1 min • 1 pt
Explain why the boiling point of alkanes increase down the series.
Answer: Going down the series, the number of carbon atoms increase. Alkane molecules increase in size. ______________ forces of attraction between alkene molecules become stronger, therefore more energy is required to overcome these stronger forces of attraction.
5.
MULTIPLE SELECT QUESTION
45 sec • 2 pts
Which chemical reactions do alkenes participate in?
Addition
Substitution
Combustion
Cracking
Answer explanation
Alkanes are generally unreactive and participate in combustion and substitution reactions, as well as cracking.
Alkenes are more reactive and participate in addition reactions (e.g. bromination, hydrogenations).
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
An alkene burns in oxygen. The chemical reaction is shown below.
2C2H4 + 5O2 --> 4CO + 4H2O
Which type of combustion has occured?
complete combustion
incomplete combustion
Answer explanation
Complete combustion only produces CO2 and H2O.
Incomplete combustion produces other compounds like CO (carbon monoxide) and C (carbon, or soot)
7.
FILL IN THE BLANK QUESTION
1 min • 1 pt
Alkanes participate in substitution reactions. What are the conditions required for this reaction?
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