Upper 6
     Home     

 

If you have any problems  that you cannot solve, email the question to the address below.

tjpereira@smkrajaperempuanipoh.com
1. Upper 6 Trial Exam Paper 1 with Ans.[2009]
2. Upper 6 Trial Exam Paper 2 with Ans[2009]

Essay questions for 2010
Answer your essay questions through the following link. http://eessayt6.smkrajaperempuanipoh.com
Take your time and use reference books, such as Tan Yin Toon[Fajar Bakti] to help with the ans.
Since this is an exercise. Do your best.
Important reminder: Answer one question at a time in the link provided.
Feb

1. Explain the variation in the following properties when descending Group 2 of the periodic table. Write equations where approriate
i) First ionisation energy of the elements
ii) Reactivity of the elements towards water                [10]

2. The table below lists the melting points and boiling points for chlorine,bromine and iodine. Discuss the trend with regard to the structure and bonding of the elements                        [6]

3. State and explain the trend in the acidity for HCl,HBr and HI in an aqueous solution.   [5]

4. Explain the effect of temperature on the value of the dissociation constant of gaseous dinitrogen tetraoxide  [3]

5. A Scientist discovered a new element with a proton number of 119 and a valence electronic configuration of 8s1 . Predict the postion of the element in the Periodic Table and state three physical properties and three chemical properties fo the element.[5]

6. Caesium is used in photoelectric cells because its atom loses electrons readily when exposed to light. Explain the ease of losing electrons for caesium.  [4]

7. Boric acid, B(OH)3, is an antiseptic found in some eyewash. In an aqueous solution, boric acid acts as a Lewis acid.
i) Define Lewis acid
ii) Explain the acidic property of aqueous boric acid.    [6]

8. Phenol is weak organic acid, explain why phenol is a weak organic acid.   [4]

Mac
1. i) Define a buffer solution?
ii)A mixture of ammonia,NH3, and aqueous solution of ammonium chloride,NH4Cl is an example of a buffer solution. Using suitable equations, explain how the buffer solution functions.                [7]

2.Phenolphthalein,HPh, is an acid-base indicator in the pH range between 8.2 and 9.8. The equilibrium equation of phenolphthalein in aqueous solution is as follows.
HPh  +  H2O ↔ H3O+  + Ph-                              ↔ = equilibrium
Explain how phenolphthalein acts in acid-base titration.                            [4]

3.a) An element X  is in group 9 and Period 4 in the Periodic Table
i) Discuss the application of the Aufbau's principle in the construction of the electronic configuration of X.
ii)Name one element which has almost the same radius as X, Give three reasons for your answer.        [7]

4.Using carbon as an example, explain the following terms
i) isotope    ii) allotrope                                                            [4]

5. a) Giving suitable examples, explain what is meant by polar molecules and nonpolar molecules.    [4]

6. Explain the following observations
i) When a charged rod is placed near to a fine stream of 1,1-dichloroethane, the liquid is deflected towards the charged rod,but nothing happens when the charged rod is placed near to a fine stream if 1,2 dichloroethane
ii)When water is placed in a microwave oven it gets heated up but nothing happens when carbon tetrachloride is placed in the microwave oven.                                                                            [7]

7.Explain the term dynamic equilibrium.                [2]

8. In the reaction 2CO2(g)↔2CO(g)  +  O2(g)
State the effect on the equilibrium constant and the amount of oxygen present at equilibrium when the following changes are made
i) A catalyst is added
ii) Sodium hydroxide is added.                                                [4]

April

1. Derive an expression for the solubility product, Ksp, of barium hyfroxide. Explain why aqueous barium nitrate forms a precipitate with aqueous sodium  hydroxide but not with aqueous ammonia.  [6]

 2 . Pure nitric acid is a colourless liquid which forms an azoetropic mixture with water. Aqueous nitric(V) acid shows a negative deviation from Raoultís Law. Explain why aqueous nitric(V) acid shows aa negative deviation from Raoultís Law.  [4] 

3. Dmitri Mendeleev is acknowledgeed by scientists as the founder of the modern periodic table.i) What is the basis of the Mendeleevís Periodic Tableii) Based on his Periodic Table, Mendeleev successfully predicted the properties of some elements that had been discovered. Name one of the elements.   [4]

4.Explain what is the difference between the terms orbit and orbital?  [3] 

5. Explain what is meant by hydrogen bonding using hydrogen fluoride as an eg.  [5] 

6. A mixture of heptane(bp= 98oC)  and octane(bp=126oC) forms an ideal soln. Explain in terms of intermolecular forces, why this mixture shows an ideal behaviour.[5]

7. Explain the principle of steam distillation. What factors determine the percentage of organic substances in the distillate. [3] 

8.  State the partition law.    Under what conditions can this law be applied [3]