Chemistry (All)
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Chemistry (All)
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25 Questions

1. Zinc phosphide - zn₃p₂ is an ionic compound. The formula of the zinc ion is zn²⁺. Deduce the formula of the phosphide ion

2. Write the ionic half-equation for the reaction that takes place at the cathode during the electrolysis of lead(ii) bromide

3. Identify the species that is reduced in the following reaction. Explain your answer: 2br⁻ + cl₂ → 2cl⁻ + br₂

4. Uses of water

5. State the method used to obtain sand from a mixture of sand and water

6. State the colour and physical state of iodine at room temperature

7. Explain why nitrogen gas - n₂ - is a gas at room temperature

8. Acid + base

9. Write the chemical equation for the reaction that produced heat in the blast furnace

10. Nucleus

11. Explain - in terms of structure and bonding - why sodium chloride has a very high melting point

12. State the uses of ammonia

13. Liquid -> solid

14. Ammonia (nh3)

15. Electron orbitals

16. Balance the following equation: wo₃ + h₂ -> w + h₂o

17. Anode is

18. Proton properties

19. Nitrogen containing fertilisers

20. Molar equation of solution

21. Cells

22. What happens during electrolysis when the substance is an aqueous solution

23. Fullerenes

24. James chadwick - neutrons in the nucleus

25. Test for carbon dioxide

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