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1. When Hydrogen reacts with chlorine the reaction is overall exothermic. Explain why.

2. Hi, please can you tell me some key factors on why the periodic table is so useful to scientists. Thanks

3. what is a reduction reaction?

4. Please, please can you explain electrolysis. I am so confused all people talk about is positive negative ions and electrons. I need to understand the three different types (aluminium production, copper purifying and something else!) A nice simple explanation and what is positive and negative and WHY? Any help MUCH appreciated thanks!

5. Hi. I don't get this equation. Please could you help? At the positive electrode: 2Cl- = Cl2 +2e-. It is an oxidation reaction but I don't get it. Does the positive anode suck up the electrons or is it always with the atoms after eletrolysis ?

6. Electrolysis - what is it? Do you have a way that I can remember the charge on the anode and cathode?

7. Electrolysis - what is it? Do you have a way that I can remember the charge on the anode and cathode?

8. Can you please explain "ions" to me? as I have never really understood! Thanks

9. Can you please explain "ions" to me? as I have never really understood! Thanks

10. Can you please explain "ions" to me? as I have never really understood! Thanks

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