reactions of alkanes
Presentation
•
Chemistry
•
9th - 10th Grade
•
Hard
Standards-aligned
Remya Radhakrishnan
Used 1+ times
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7 Slides • 24 Questions
1
By Remya Radhakrishnan
2
Understand how to know the trend in colour, boiling point and viscosity of the main fractions
Some text here about the topic of discussion
3
Key words
boiling points
viscous
volatile
flammability
Subject | Subject
Some text here about the topic of discussion
4
Open Ended
Identify and write the name of the structure
5
Multiple Choice
In the fractional distillation of crude oil, where is the hottest part of the fractionating column?
top of the tower
middle of the tower
bottom of the tower
6
Multiple Choice
Which fraction leaves the tower at the very top?
fuel oil
refinery gas
petrol
7
Multiple Choice
Which is a use for kerosene (paraffin)?
fuel for cars
construction of roads
aircraft fuel
8
Multiple Choice
Where do the longest hydrocarbon molecules condense?
At the top of the tower
At the bottom of the tower
They do not condense at all and remain a gas
9
Multiple Choice
Which is the main compound in natural gas?
ethane
methane
propane
10
11
Multiple Choice
Which of the following is the most viscous?
kerosene
fuel oil
petrol
bitumen
12
Multiple Choice
Which of the following is most volatile
refinery gas
petrol
kerosene
fuel oil
13
Multiple Choice
The colour the the fractions becomer darker
as the size of the molecules decreases
as the size of the molecules increases
14
Multiple Choice
Which fraction has the longest chain length.
petrol
kerosene
fuel oil
diesel
15
Multiple Choice
Which of the fraction is highly flammable?
petrol
refinery gas
diesel
kerosene
16
Combustion
Burning in the presence of oxygen. All alkanes burn in air or oxygen.
Combustion can be classified as Complete combustion and incomplete combustion.
Subject | Subject
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17
Complete combustion
If there is enough oxygen, alkanes burn completely to give carbon dioxide and water.
Subject | Subject
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18
Multiple Select
Identify the correct balanced chemical equation for the complete combustion of ethane.
2C2H6 + 7O2 --> 4CO2 + 6H2O
C2H6 + O2 --> CO + H2O
C2H6 + 3.5 O2 --> 2CO2 + 3H2O
C2H6 + 3O2 --> 2CO2 + 3H2O
19
Open Ended
Write the complete balanced chemical equations for methane and butane.
20
Incomplete combustion
If there isn't enough oxygen, there is incomplete combustion of the hydrocarbon and obtain carbon monoxide or carbon(soot) instead of carbon dioxide.
Subject | Subject
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21
Fill in the Blanks
COMPLETE THE EQUATION
CH4 + O2 --> CO + H2O
Type answer...
22
Open Ended
Write equations for incomplete combustion of butane to form carbon monoxide and watervapour
23
Multiple Choice
Which of the following is an alkane?
ethanol
cyclohexane
propene
24
Multiple Choice
Looking at the chemical formulae of these compounds, which is an alkane?
C3H8
C2H4
C5H10
25
Multiple Choice
What is the name of the alkane which has the formula C4H10?
ethane
octane
butene
butane
26
Open Ended
Alkanes are saturated hydrocarbons. What does this mean?
27
Fill in the Blanks
When hydrocarbons like the alkanes burn in plenty of air, what type of reaction takes place?
Type answer...
28
Multiple Choice
Which is a correct statement about incomplete combustion?
Poisonous carbon monoxide may be produced
It releases more energy than complete combustion
It is cleaner than complete combustion
29
Multiple Choice
Which of these equations shows complete combustion?
C3H8 + 5O2 → 3CO2 + 4H2O
C3H8 + 3½O2 → 3CO + 4H2O
C3H8 + 2O2 → 3C + 4H2O
30
Open Ended
Write a balanced chemical equation for the incomplete combustion of pentane forming carbon monoxide and water.
31
Open Ended
Alkenes more reactive than alkanes.
Yes or no, give an explanation for your answer.
By Remya Radhakrishnan
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