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Chemistry Revision 3

Chemistry Revision 3 . Electronic configurations. State which block in the periodic table you find the following elements: Sulphur Vanadium Strontium. Electronic configurations. Sulphur = p Vanadium = d Strontium = s

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Chemistry Revision 3

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  1. Chemistry Revision 3

  2. Electronic configurations • State which block in the periodic table you find the following elements: • Sulphur • Vanadium • Strontium

  3. Electronic configurations • Sulphur = p • Vanadium = d • Strontium = s • Write the full electronic configurations of the following elements (in terms of 1s2 etc) • Chlorine (17e), Cobalt (27e), Copper (29e)

  4. Electronic configurations • Chlorine • 1s2 2s2 2p6 3s2 3p5 • Cobalt • 1s2 2s2 2p6 3s2 3p6 3d7 4s2 • Copper • 1s2 2s2 2p6 3s2 3p6 3d10 4s1 • Note this is an exception along with CHROMIUM

  5. Group 7 Chemistry • Complete the following table

  6. More on group 7 • What do I see if I add sodium bromide solution to a solution of silver nitrate? • Write the IONIC equation for this reaction, including state symbols.

  7. The answer- • A cream precipitate would form on mixing the two colourless solutions. • Ag+(aq) + Br-(aq) AgBr (s) • Remember that an ionic equation does not include spectator ions!!

  8. Oxidation numbers • Identify oxidation numbers in the following, and thus deduce whether it is oxidation or reduction or neither!

  9. And the answers

  10. Half equations • Write the overall equation and the two half equations for the reactions occurring when chlorine water is added to potassium iodide solution • Identify what has been reduced.

  11. Half equations • Cl2(aq) + 2I- (aq) 2Cl-(aq) + I2(aq) • Reduced: Cl2(aq) + 2e-  2Cl-(aq) • Oxidised: 2I- (aq) 2e- + I2(aq) • Remember half equations do as they say- they show what is happening in half the equation!

  12. Economic importance of Cl + Br • Give 2 uses of chlorine or its compounds • Give 2 uses of bromine or its compounds • Remember you are expected to know the redox chemistry of the extraction of bromine from sea water.

  13. Ionic Lattices • Draw a labelled diagram to show the structure of an ionic lattice, as exemplified by sodium chloride

  14. Solution calculations • It takes 12.30cm3 of 0.05M NaOH to neutralise 25.00cm3 of HCl. • 1) Write the balanced chemical equation • 2) Work out the number of moles of NaOH used • 3) Work out the concentration of HCl

  15. Now try the exam q. • More next week. • Remember- I am here to help and support- BUT I can’t do the work for you. • Are you “striving for the best of yourself always”??

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