Identifying Gases

We can test for hydrogen by placing a lighted split in a test tube containing the gas.

The test for carbon dioxide involves bubbling the gas through limewater.

We can use a glowing splint to test for oxygen in a test tube.

We can use damp litmus paper to test for chlorine.

Gases can be identified in the lab by simple tests.

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What oxygen based reaction occurs in this test?

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If oxygen is present in the test tube what will we see?

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If an oxygen containing gas is present, such as CO2, will the splint relight?

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Choose the correct definition of combustion from the options shown.

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What property of chlorine gas is it that allows it to act as a bleach?

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What type of paper is used in the test for chlorine?

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What result do we see from this test is chlorine is present?

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If the litmus paper shown is used, what colour changes do we see (hint: look at the colour of the paper)?

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An experiment was conducted and the results recorded in the table. From the results, what gas has been tested?

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A gas being tested in the lab is giving off a sharp, choking smell. What gas could it be?

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You are testing a gas you know to be either hydrogen or chlorine. Which test would you use? Why?

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You have a solution which you believe will give off CO2 when heated. If you have a bunsen burner available, how would you go about testing for CO2?

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Can we work out from the given experimental results exactly what gas has been tested? Why/why not?

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You are trying to identify a gas in the lab. Your partner suggest that you’d be able to identify by smelling the fumes. Why is this a bad idea?

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From the given results, what two gases must be present?

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You suspect a gas you are testing to be toxic, what precaution should you take when testing it in the lab?

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What property of hydrogen allows this test to be carried out?

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What happens in the test if hydrogen is present in the test tube?

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What happens in the test if hydrogen is not present in the test tube?

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A student is about to conduct the test for hydrogen. They are using the test tube shown in the diagram. What is the mistake they have made and the dangers arising from this mistake?

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Limewater is a solution of what hydroxide?

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Draw a diagram to show test tubes containing the limewater before and after carbon dioxide is added

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What colour is the precipitate produced in this test?

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What is the precipitate produced?

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