(01 Nov) Qns

Posted by Kyo on October 31, 2007 at 16:16:03:

In Reply to: Ans to (Oct 31) Qns posted by Kyo on October 30, 2007 at 17:42:54:

Q17 (01 Nov 07)
Draw and name all the isomers of the compound C2H4FBr.


Q18 (01 Nov 07)
Explain why silicon dioxide is a giant covalent/molecular compound while carbon dioxide is a simple covalent/molecular compound.


Q19 (01 Nov 07)
a) Consider the two reactions :
organic compound X (g) + O2 (g) --> H2O (g) + CO2 (g)
organic compound X (g) + O2 (g) --> H2O (l) + CO2 (g)
How will the enthalpy of reaction differ between the two reactions? Explain.




Q20 (01 Nov 07)
When a mixture containing 2:1 ratio of NO and O2 at a total initial pressure of 5 atm is allowed to react at 400 deg C, the partial pressure of NO2 formed at equilibrium was found to be at 1.76 atm.
a) Determine the percentage conversion of NO.
b) Calculate the value of Kp.


Q21 (01 Nov 07)
20cm3 of a gaseous hydrocarbon was mixed with 100cm3 of oxygen so that the hydrocarbon was completely burnt. The volume of gas remaining at the end of the combustion was 70cm3. After passing through soda lime, the volume was reduced to 10cm3. All gases were measured at 25 deg C and at the same pressure. Calculate the formula of the hydrocarbon.


Q22 (01 Nov 07)
a) When potassium chlorate(V) (IUPAC name) a.k.a. potassium chlorate (common name) is heated at its melting point, it disproportionates to potassium chlorate (VII) a.k.a. potassium perchlorate (common name), and potassium chloride. What is the maximum number of moles of the RHS product containing chlorine with the higher oxidation state, that could be produced from heating 0.1 mol of the LHS reactant potassium chlorate(V) a.k.a. potassium chlorate?

b) Chlorine is a group VII element and has the ability to exist in more than one oxidation state. NaClOn (where n represents the number of oxygen atoms) is a strong oxidising agent. When 2 mol of acidified NaClOn reacted with excess potassium iodide, both iodine and chlorine is liberated. The iodine liberated required 10 mol of sodium thiosulphate for complete reaction, what is the value of n?

Follow Ups:

• Ans to (01 Nov) Qns - Kyo 11/01/07 (11)
  • (02 Nov) Qns - Kyo 11/01/07 (10)
    • Ans to (02 Nov) Qns - Kyo 11/02/07 (9)
      • (03 Nov) Qns - Kyo 11/02/07 (8)
        • Ans to (03 Nov) Qns - Kyo 11/03/07 (7)
          • (04 Nov) Qns - Kyo 11/03/07 (6)
            • Ans to (04 Nov) Qns - Kyo 11/03/07 (5)
              • Final Day (05 Nov) Qns - Kyo 11/03/07 (4)
                • Spot the Chemistry Errors in this YouTube video! - Kyo 05/22/08 (3)
                  • Balance the equation : NO2 + H2O ---> N2O + HNO3 - Kyo 06/25/08 (2)
                    • NH3 vs PH3 ; H2O vs H2S - Kyo 06/26/08 (1)
                      • Br2 (aq) vs Br2 (CCl4) ; and Methylbenzene vs Phenol - Kyo 07/06/08 (0)

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