GCSE C4.2

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Identifying products of chemical reactions

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23 Terms

1
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Test for carbon dioxide

bubble through limewater if present

2
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Test for hydrogen

-hold a lighted splint at the open end of a test tube of gas

  • creates a squeaky pop sound

3
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Test for oxygen

place a glowing splint inside a test tube of gas

4
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Test for chlorine

damp blue litmus paper will be bleached white

5
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Colour of Li+ flame test

Red

6
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Colour of Na+ flame test

Yellow

7
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Colour of K+ flame test

Lilac

8
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Colour of Ca 2+ flame test

orange-red

9
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Colour of Cu 2+ flame test

blue-green

10
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Metal ions produce a ...

colour if heated strongly in a flame

11
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How do you carry out a flame test?

  • dip the loop of an unreactive metal in dilute acid

12
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How can metal cations in aq solutions be identified?

by the colour of the precipitate they form on addition of sodium hydroxide

13
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What forms a white precipitate with the addition of sodium hydroxide?

Calcium

14
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What forms a blue precipitate with the addition of sodium hydroxide?

Copper (II)

15
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What forms a green precipitate with the addition of sodium hydroxide?

Iron (II)

16
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Orange-brown precipitate with the addition of sodium hydroxide?

Iron (III)

17
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What do all carbonates contain?

the carbonate ion CO3 2-

18
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What is released when carbonates react with dilute acids

carbon dioxide

19
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How to test for carbonate ions?

  • add dilute acid then test the gas released

  • if a carbonate compound is present then fizzing should be seen and the gas produced is carbon dioxide which turns limewater cloudy when bubbled through

20
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How to test for a sulfate ion?

  • acidify the sample with dilute hydrochloric acid

21
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How to test for Halide ions?

  • add dilute nitric acid

22
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Instrumental analysis

Faster More accurate Sensitive

23
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The last peak of a mass spectrum tells us...

the relative formula mass of the compound