Identifying gases | Assessment Resource Banks

Identifying gases

This task is about using a key to identify gases.

Question 1Change answer

Use the key to identify the gases in the jars labelled A to D.

Key to identifying gases

1. Is the gas colourless?	Yes No	go to 2 ⇒nitrogen dioxide
2. Is the gas soluble in water?	Yes No	go to 3 go to 4
3. Does the gas turn moist litmus pink?	Yes No	⇒carbon dioxide ⇒ammonia
4. Is the gas less dense than air?	Yes No	⇒hydrogen ⇒oxygen

Use the key to identify the gases in the jars labelled A to D.

Key to identifying gases

1. Is the gas colourless?	Yes No	go to 2 ⇒nitrogen dioxide
2. Is the gas soluble in water?	Yes No	go to 3 go to 4
3. Does the gas turn moist litmus pink?	Yes No	⇒carbon dioxide ⇒ammonia
4. Is the gas less dense than air?	Yes No	⇒hydrogen ⇒oxygen

Jar A	Jar B	Jar C	Jar D
Gas? Nitrogen dioxideCarbon dioxideAmmoniaHydrogenOxygen	Gas? Nitrogen dioxideCarbon dioxideAmmoniaHydrogenOxygen	Gas? Nitrogen dioxideCarbon dioxideAmmoniaHydrogenOxygen	Gas? Nitrogen dioxideCarbon dioxideAmmoniaHydrogenOxygen

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