Chemical tests and analysis - tests for gases - Flashcards in IGCSE Chemistry

Created by: Beata16
Created on: 27-04-17 11:27

ammonia gas (NH3)

colourless, pungent smell. Test: hold damp red litmus paper (or Universal Indicator paper) in gas. Indicator paper turns blue.

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carbon dioxide (CO2)

colourless, odourless. Test: bubble gas through limewater (calcium hydroxide solution). Result: white precipitate of calcium carbonate formed (solution turns milky)

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chlorine (Cl2) - this gas is poisonous so test with care and use a fume cupboard

pale green, choking smell. Test hold damp litmus paper (or Universal Indicator paper) in gas. Result: indicator paper is bleached white (blue litmus will turn red first)

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sulfur dioxide (SO2) - this gas is harmful and can cause breathing difficulties

colourless, pungent acidic smell. Test: add to a solution of, or filter paper soaked in, potassium manganate (vii). Test: potassium manganate (vii) changes from purple to colourless

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hydrogen (H2)

colourless, odourless. Test: hold a lighted splint in gas. Result: hydrogen burns with a squeaky "pop".

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oxygen (O2)

colourless, odourless. Test: hold a "glowing" wooden splint in gas. Result: the splint re-lights.

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Other cards in this set

Card 2

Front

carbon dioxide (CO2)

Back

colourless, odourless. Test: bubble gas through limewater (calcium hydroxide solution). Result: white precipitate of calcium carbonate formed (solution turns milky)

Card 3

Front

chlorine (Cl2) - this gas is poisonous so test with care and use a fume cupboard

Back

Card 4

Front

sulfur dioxide (SO2) - this gas is harmful and can cause breathing difficulties

Back

Card 5

Front

hydrogen (H2)

Back

View more cards

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Chemical tests and analysis - tests for gases