Redox reactions

Last updated: 03/03/2020
OCR-A A-Level Chemistry Redox Redox reactions
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  1. Current
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  3. Answered

  1. Why are redox reactions used?

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  2. How are redox titrations titrated?

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  3. What is the definition of oxidation?

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  4. What is the definition of oxidation?

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  5. What is the definition of reduction?

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  6. What is the definition of reduction?

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  7. What happens to electrons in oxidation and reduction reactions?

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  8. Within the following reaction, which element is oxidised?

    2NaClO3_3(aq) -> 2NaCl(aq) + 3O2_2(g)

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  9. Within the following reaction, which element is reduced?

    2NaClO3_3(aq) -> 2NaCl(aq) + 3O2_2(g)

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  10. Within the following reaction, which element is oxidised?

    NH4_4NO3_3(aq) + KOH(aq) -> NH4_4OH(aq) + KNO3_3(aq)

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  11. Within the following reaction, which element is reduced?

    NH4_4NO3_3(aq) + KOH(aq) -> NH4_4OH(aq) + KNO3_3(aq)

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  12. What element has been oxidised during the following reaction?

    Cl2_2(g) + 2NaBr(aq) -> 2NaCl(s) + Br2_2(g)

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  13. What element has been reduced during the following reaction?

    Cl2_2(g) + 2NaBr(aq) -> 2NaCl(s) + Br2_2(g)

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  14. During the following reaction, which element is oxidised?

    16HCl(aq) + 5SnCl2_2(aq) + 2KMnO4_4(aq) -> 2MnCl2_2(aq) + 5SnCl4_4(aq) + 8H2_2O(l) + 2KCl(aq)

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  15. During the following reaction, which element is reduced?

    16HCl(aq) + 5SnCl2_2(aq) + 2KMnO4_4(aq) -> 2MnCl2_2(aq) + 5SnCl4_4(aq) + 8H2_2O(l) + 2KCl(aq)

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  16. Which element is oxidised and which is reduced during the following reaction?

    2H2_2O(l) -> 2H2_2(g) + O2_2(g)

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  17. Which element is oxidised and which is reduced during the following reaction?

    Mg(s) + 2HCl(aq) -> MgCl2_2(aq) + H2_2(g)

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  18. Which element is oxidised and which is reduced during the following reaction?

    2Na(s) + 2H2_2O(l) -> 2NaOH(aq) + H2_2(g)

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  19. What change in oxidation state does nitrogen undergo during the following reaction?

    3Mg(s) + N2_2(g) -> Mg3_3N2_2(aq)

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  20. What change in oxidation state does magnesium undergo during the following reaction?

    3Mg(s) + N2_2(g) -> Mg3_3N2_2(aq)

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  21. What change in oxidation state does lithium undergo during following reaction?

    2Li(s) + S(aq) -> Li2_2S(s)

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  22. What change in oxidation state does sulfur undergo during following reaction?

    2Li(s) + S(aq) -> Li2_2S(s)

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