Question

gas collecting
test tube
beaker
pond water
upside-down funnel
Activity 1.3A
Collecting the gas produced in photosynthesis
SE The diagram shows the apparatus you
need to set up for this experiment
You can use any plant that grows
under water. You can usually get pond
weed at a pet shop, because people
buy it to put into fish tanks. If you
live near the sea, you can use
seaweed instead.
Leave the apparatus in a place where
the plant will get plenty of light. If
it is very warm and sunny, you may
see the gas collecting quickly. If it is
water plant
colder and not so bright, you may
need to leave it for a day to give time
for the gas to collect
block to support funnel
When you have collected about half a
test tube of gas, you can test it to see
if it is oxygen, like this:
1 Put your hand into the water in the beaker, and hold the test tube near its
opening, Put your thumb over the opening, taking care to keep the test tube
under water
2 Keeping the tube open end downwards, take it out of the water.
3 Get a partner to light a wooden splint, then blow it out so that it is
just glowing
4 Now gently take off your thumb, to let the water fall out of the tube.
5 When all the water has fallen out, quickly but carefully put the glowing
splint into the tube. Try not to touch the wet sides, or you will put it out!
6 If the gas is oxygen, it will make the glowing splint burst into flame.
Questions
As Explain why you needed to use a water plant for this experiment.
A2 Explain why you needed to leave the apparatus in a light place.
10
1 Plants
Science

Answer 1

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Answer 2

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