for questions 8 and 9 use the information below.
The diagrams show three methods that are commonly used to collect gases.
Method 1
Method 2
gas
Method 3
gas collected
lid
gas
water
air
air
lid
gas
Some colourless gases and their properties are shown.
Gas
ammonia
oxygen
hydrogen
methane
carbon dioxide
Soluble in water
yes
no
no
no
yes
Mass compared to equal volume of air
less
equal
less
less
more
What are the best methods for collecting some of these gases?
(C)
(D)
Carbon dioxide
method 1
method 3
method 2
method 1
Hydrogen
method 2
method 2
method 3
method 2
Oxygen
method 2
method 2
method 1
method 2
A student wished to collect methane gas using method 3.
What would be her biggest problem?
(D)
getting the methane to stay in the flask
knowing when the flask is full
preventing the methane from igniting
avoiding the strong smell of methane
An
m
m
m