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1                       Seminar chemistry form 5 ( Revision for selaras 2)                        Date : 5 th April 2011 (...
22)Answer the following questions                                   Electrode P   Electrode Q     a) State all ions presen...
3   3) Organic reaction                              CO2 + H2O                                          Reaction 1        ...
4   (if any)       d) EquationsB) Draw diagram for experiment to carry out for reaction 2     …………………………………………………………………………...
55) A student obtained the following data to determine heat of precipitation of lead(II) sulphate   (VI), PbSO4Solution   ...
6c) Write thermo chemical equation ……………………………………………………………………………d) Write the ionic equation ………………………………………………………………………………...
7        a) Using data above, calculate the change in temperature occur during the experiment            [Specific heat ca...
8                              3)                              4)   b) What formula to use ?   c) Unit?   d) Symbol?END…..
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Seminar revision on chapter electrchemistry, carbon compound and thermo chemistry

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Seminar revision on chapter electrchemistry, carbon compound and thermo chemistry

  1. 1. 1 Seminar chemistry form 5 ( Revision for selaras 2) Date : 5 th April 2011 ( Tuesday) Time: 3.15 pm Name………………………………………………class……………………….teacher………….1)Refer to the diagram above: Cell P Cell Q Electrode M Electrode N Electrode R Electrode S Name of cell Label anode and cathode State products State observations Write ionic equations State change of energy
  2. 2. 22)Answer the following questions Electrode P Electrode Q a) State all ions present b) Label anode and cathode c) State ions attracted to d) State ions discharged e) State products and what is the factor involved? f) Give a reason why you have the product as mentioned above? g) Write ionic equations h) State observations and how do you test the products? i) If the experiment is repeated with concentration of solution 0.001 mol dm-3. State the products . And what is the factor involved?
  3. 3. 3 3) Organic reaction CO2 + H2O Reaction 1 Ethyl ethanoateEthene Reaction 2 Reaction 4 ethanol Reaction 3 Reaction 5 Reaction 6 Ethanoic acid A) Refer to the above reaction: Reactions 1 2 3 a) Name of reactions b) Reagents used c) Conditions (if any) d) Equations Reactions 4 5 6 a) Name of reactions b) Reagents used c) Conditions
  4. 4. 4 (if any) d) EquationsB) Draw diagram for experiment to carry out for reaction 2 ………………………………………………………………………………………………………………………………4) DESCRIBE THE COAGULATION OF LATEX when exposed to air
  5. 5. 55) A student obtained the following data to determine heat of precipitation of lead(II) sulphate (VI), PbSO4Solution Volume (cm3) Concentration Initial temperature (moldm-3) (oC)Lead(II) nitrate 50 0.5 27.4Sodium sulphate 50 0.5 27.6Highest temperature = 30.5 oCa) What is meant by heat of precipitation? ………………………………………………………………………………….. ……………………………………….. …………………………………………………………………………………………………………………………………..b) Using data above, calculate heat of precipitation of lead (II) sulphate [Specific heat capacity 4.2 J g-1 o C-1 , density of solution , 1g cm-3 ]
  6. 6. 6c) Write thermo chemical equation ……………………………………………………………………………d) Write the ionic equation …………………………………………………………………………………………e) Construct energy level diagram …………………………………………………………………………………………….f) The experiment is repeated, using potassium sulphate to replace sodium sulphate, with other conditions remain constant, and it was found that heat of precipitation of lead(II) sulphate is the same. Explain ………………………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………………6) A student carried out an experiment to determine heat of displacement of copper from copper (II) sulphate solution . He added excess zinc powder to 50 cm3 of 0.20 mol dm-3 of copper(II) sulphate solution. The thermo chemical equation is shown below Zn + Cu 2+  Cu + Zn 2+ ∆H = -80.64kJ mol-1
  7. 7. 7 a) Using data above, calculate the change in temperature occur during the experiment [Specific heat capacity 4.2 J g-1 o C-1 , density of solution , 1g cm-3 ] …………………………………………………………………………………….. b) Write ionic equation ………………………………………………………………………………….. c) Experiments are repeated with the following changes. What is the effect on change in temperature? Explain your answer • concentration of copper(II) sulphate solution is doubled, without changing the volume ………………………………………………………………………………………………………………………… • The volume of copper(II) sulphate solution is halved without changing the concentration ……………………………………………………………………………………………………….7) State differences between heat change and heat of reaction Heat change Heat of reaction a) Other names Depends on name of reactions 1) 2)
  8. 8. 8 3) 4) b) What formula to use ? c) Unit? d) Symbol?END…..

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