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GCSE Chemistry – Tests for cations

Last updated: 14/04/2020

AQA GCSE Science – Chemistry foundation Chemical analysis GCSE Chemistry – Tests for cations

Learning Objectives

-I can recall the colours of the flame test
-I can recall the result for testing with sodium hydroxide
-I can write balanced equations for the reactions with sodium hydroxide

Time limit: 0

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Question 1 of 25

1. Question
What are the definition of cations?
- Positive ions
- Negative ions
- Atoms
- Negative compounds
Correct

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Question 2 of 25

2. Question
What type of ions are formed by group 1 elements?
- +
- 2+
- –
- 2-
Correct

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Question 3 of 25

3. Question
What type of ions are formed by group 2 elements?
- 2+
- +
- –
- 2-
Correct

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Question 4 of 25

4. Question
What type of ions are formed by group 3 elements?
- 3+
- 3-
- 2+
- 2-
Correct

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Question 5 of 25

5. Question
How can you test for metal cations?
- Flame tests
- Add a dilute hydrochloric acid
- Add to limewater
- Add silver nitrate solution
Correct

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Question 6 of 25

6. Question
Before a metal cation is tested through a flame, what must it be dipped in?
- Concentrated hydrochloric acid
- Dilute hydrochloric acid
- Calcium carbonate
- Magnesium carbonate
Correct

Incorrect
Question 7 of 25

7. Question
What colour flame will form for a lithium ion?
- Crimson
- Green
- Orange-red
- Lilac
Correct

Incorrect
Question 8 of 25

8. Question
What colour flame will form for a sodium ion?
- Yellow
- Lilac
- Crimson
- Green
Correct

Incorrect
Question 9 of 25

9. Question
What colour flame will form for a potassium ion?
- Lilac
- Orange-red
- Green
- Crimson
Correct

Incorrect
Question 10 of 25

10. Question
What colour flame will form for a calcium ion?
- Orange-red
- Yellow
- Crimson
- Lilac
Correct

Incorrect
Question 11 of 25

11. Question
What colour flame will form for a copper ion?
- Green
- Yellow
- Orange-red
- Crimson
Correct

Incorrect
Question 12 of 25

12. Question
How can you test for metal cations?
- Sodium hydroxide solution
- Calcium carbonate
- Tin
- Magnesium carbonate
Correct

Incorrect
Question 13 of 25

13. Question
When testing for metal cations with sodium hydroxide what type of observation is seen?
- Precipitates
- Effervescence
- Solution
- Flame colours
Correct

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Question 14 of 25

14. Question
What colour precipitate will form for an aluminium ion?
- White
- Green
- Blue
- Brown
Correct

Incorrect
Question 15 of 25

15. Question
What colour precipitate will form for a magnesium ion?
- White
- Green
- Blue
- Brown
Correct

Incorrect
Question 16 of 25

16. Question
What colour precipitate will form for a calcium ion?
- White
- Green
- Blue
- Brown
Correct

Incorrect
Question 17 of 25

17. Question
What colour precipitate will form for a copper(II) ion?
- Blue
- White
- Green
- Brown
Correct

Incorrect
Question 18 of 25

18. Question
What colour precipitate will form for an iron(II) ion?
- Green
- White
- Blue
- Brown
Correct

Incorrect
Question 19 of 25

19. Question
What colour precipitate will form for an iron(III) ion?
- Brown
- White
- Blue
- Green
Correct

Incorrect
Question 20 of 25

20. Question
Write the ionic equation for the testing of an aluminium ion with sodium hydroxide.
- $Al^{3+}(aq) + 3OH^-(aq) -> Al(OH)_3(s)$
- $Al^{2+}(aq) + 2OH^-(aq) -> Al(OH)_2(s)$
- $Al^{3-}(aq) + 3OH^+(aq) -> Al(OH)_3(s)$
- $Al^+(aq) + 3OH^-(aq) -> Al(OH)(s)$
Correct

Incorrect
Question 21 of 25

21. Question
Write the ionic equation for the testing of a magnesium ion with sodium hydroxide.
- $Mg^{2+}(aq) + 2OH^-(aq) -> Mg(OH)_2(s)$
- $Mg^{2-}(aq) + 2OH^+(aq) -> Mg(OH)_2(s)$
- $Mg^{3+}(aq) + 3OH^-(aq) -> Mg(OH)_3(s)$
- $Mg^+(aq) + OH^-(aq) -> Mg(OH)(s)$
Correct

Incorrect
Question 22 of 25

22. Question
Write the ionic equation for the testing of a calcium ion with sodium hydroxide.
- $Ca^{2+}(aq) + 2OH^-(aq) -> Ca(OH)_2(s)$
- $Ca^{2-}(aq) + 2OH^+(aq) -> Ca(OH)_2(s)$
- $Ca^{3+}(aq) + 3OH^-(aq) -> Ca(OH)_3(s)$
- $Ca^+(aq) + OH^-(aq) -> Ca(OH)(s)$
Correct

Incorrect
Question 23 of 25

23. Question
Write the ionic equation for the testing of a copper(II) ion with sodium hydroxide.
- $Cu^{2+}(aq) + 2OH^-(aq) -> Cu(OH)_2(s)$
- $Cu^{2-}(aq) + 2OH^+(aq) -> Cu(OH)_2(s)$
- $Cu^{3+}(aq) + 3OH^-(aq) -> Cu(OH)_3(s)$
- $Cu^+(aq) + OH^-(aq) -> Cu(OH)(s)$
Correct

Incorrect
Question 24 of 25

24. Question
Write the ionic equation for the testing of an iron(II) ion with sodium hydroxide.
- $Fe^{2+}(aq) + 2OH^-(aq) -> Fe(OH)_2(s)$
- $Fe^{2-}(aq) + 2OH^+(aq) -> Fe(OH)_2(s)$
- $Fe^{3+}(aq) + 3OH^-(aq) -> Fe(OH)_3(s)$
- $Fe^+(aq) + OH^-(aq) -> Fe(OH)(s)$
Correct

Incorrect
Question 25 of 25

25. Question
Write the ionic equation for the testing of an iron(III) ion with sodium hydroxide.
- $Fe^{3+}(aq) + 3OH^-(aq) -> Fe(OH)_3(s)$
- $Fe^{2+}(aq) + 2OH^-(aq) -> Fe(OH)_2(s)$
- $Fe^{3-}(aq) + 3OH^+(aq) -> Fe(OH)_3(s)$
- $Fe^+(aq) + 3OH^-(aq) -> Fe(OH)(s)$
Correct

Incorrect

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