C1.15a Testing gases Name 1
a
Class
The steps in the table below describe how to test for hydrogen. Write a number next to each step to show the correct order. The first one has been done for you. 1
Put on eye protection
Hold the lighted splint just inside the mouth of the test tube Light a splint in the flame from the Bunsen burner Light a Bunsen burner
Hold the test tube with the bung at the bottom Ask your partner to remove the bung b
Date
What will happen if the gas is hydrogen? __________________________________________________________________________
2
a
Which of these things do you need to carry out a test for chlorine gas? damp red litmus paper
b
3
damp blue litmus paper
damp filter paper
If the gas is chlorine, the paper will turn: blue and then red
blue and then white
red and then white
red and then blue
Describe the test to show the presence of oxygen. Explain what you would do and what you would see if the gas is oxygen. _____________________________________________________________________________ _____________________________________________________________________________
4
Tick the boxes to show which gases will be produced when these electrolysis reactions are carried out. Electrolysis of:
Produces: oxygen
chlorine
dilute hydrochloric acid water sea water
Š Pearson Education 2010. Edexcel GCSE Science Activity Pack This document may have been altered from the original.
hydrogen
C1.15b Electrolysis and gases 1
Write three sections for a laboratory manual on how to test gases – one section for each of hydrogen, oxygen and chlorine. The instructions should include an apparatus list, safety precautions and step-by-step instructions. They should also explain what the user would see if the gas is the one being tested for.
2
a
Hydrogen
b
Oxygen
c
Chlorine
Sulfur dioxide is a gas that dissolves in water to form an acid. a
What would you see if you held damp blue litmus paper in sulfur dioxide?
b
How can you distinguish between sulfur dioxide and chlorine using damp blue litmus paper?
3
Draw a labelled diagram showing how hydrogen and oxygen can be produced from water.
4
Which electrolytes can be used to produce the following gases by electrolysis? a
hydrogen
b
chlorine
C1.15b Electrolysis and gases 1
Write three sections for a laboratory manual on how to test gases – one section for each of hydrogen, oxygen and chlorine. The instructions should include an apparatus list, safety precautions and step-by-step instructions. They should also explain what the user would see if the gas is the one being tested for.
2
a
Hydrogen
b
Oxygen
c
Chlorine
Sulfur dioxide is a gas that dissolves in water to form an acid. a
What would you see if you held damp blue litmus paper in sulfur dioxide?
b
How can you distinguish between sulfur dioxide and chlorine using damp blue litmus paper?
3
Draw a labelled diagram showing how hydrogen and oxygen can be produced from water.
4
Which electrolytes can be used to produce the following gases by electrolysis? a
hydrogen
b
chlorine
© Pearson Education 2010. Edexcel GCSE Science Activity Pack This document may have been altered from the original.