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1. Who worked on the periodic table before Mendeleev and which elements did he predict would exist?

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

3. 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 ?

4. Can you explain the carbon cycle to me and use it to indicate the environmental problems associated with an increase in the amount of greenhouse gases in the atmosphere? Thanks. Sara, age 15.

5. What is an 'empirical formula', and how can it be calculated? Tariq, age 14.

6. what goes in the method of an investigation of how the rate of the reaction of Mg with HCl varies with concentration of the acid? sorry i'm quite unsure

7. what goes in the method of an investigation of how the rate of the reaction of Mg with HCl varies with concentration of the acid? sorry i'm quite unsure

8. what goes in the method of an investigation of how the rate of the reaction of Mg with HCl varies with concentration of the acid? sorry i'm quite unsure

9. I am doing a coursework investigation on the Reactivity Series, and I really don't know what to comment on for the analysis.

10. how is denim made?

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