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A Level questions. Moles A student took 1g of Citric acid C 6 H 8 O 7.xH 2 O and dissolved it in 100cm 3 of water. 10cm 3 of this solution neutralised.

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Presentation on theme: "A Level questions. Moles A student took 1g of Citric acid C 6 H 8 O 7.xH 2 O and dissolved it in 100cm 3 of water. 10cm 3 of this solution neutralised."— Presentation transcript:

1 A Level questions

2 Moles A student took 1g of Citric acid C 6 H 8 O 7.xH 2 O and dissolved it in 100cm 3 of water. 10cm 3 of this solution neutralised 14.3cm 3 of 0.1M NaOH Citric acid is a tribasic acid and can be written as H 3 Y a.Write a balanced equation between citric acid and NaOH b.Show that the number of moles of citric acid that was neutralised was 4.77x10 -4 c.Hence calculate the anhydrous mass of citric acid present in the 1g of hydrated citric acid d.Hence work out the value of x in C 6 H 8 O 7.xH 2 O

3 Trends Explain why a.K has a lower Boiling Point than Ca b.Si has a higher Boiling Point than P c.Mg is a worse conductor than Al d.F atoms are smaller than N atoms e.F atoms have a lower first IE than Ne atoms but a higher first IE than Na atoms f.H 2 O has a lower melting point than Na 2 O but a higher melting point than CO 2

4 Shapes Draw dot ‘n’ cross diagrams of SO 3, Cl 2 S, PF 3, SiCl 4 Predict the shape of these 4 molecules Draw dot ‘n’ cross diagram of NaCl, MgCl 2 Explain why MgCl 2 has the higher Melting Point Explain why neither conduct electricity when solid but both do when molten.

5 Reactivity Why is Mg less reactive than Ca? How could you show this? Why is I 2 less reactive than Cl 2 How could you show this Which decomposes at a lower temp CaCO 3 or MgCO 3 ?

6 Observations What do you see when you (write a balanced equation to show obs) a.Add CaCO 3 to HCl b.Add CaO to HCl c.Add AgNO 3 to NaBr followed by i.Dil NH 3 ii.Conc NH 3 d. Add AgNO 3 to NaCl followed by i.Dil NH 3 ii.Conc NH 3 e. Add AgNO 3 to NaI followed by i.Dil NH 3 ii.Conc NH 3


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