Che0100:Chemistry. Question Paper
Che0100:Chemistry.
Course:Chemistry
Institution: Meru University Of Science And Technology question papers
Exam Year:2012
QUESTION ONE (30 MARKS)
a) Write the electronic configuration of the following elements using the inert gas core notation. (4 Marks) i. Magnesium (mg)(12) ii. Fluorine (f) (9) iii. Phosphorous (p) (15) iv. Borun (B) (5) b) State four (4 Marks) c) (3 Marks) d) Differentiate between oxidation and reduction reactions. (2 Marks) e) 420g of a compound of iron with sulphur only contained 224g of sulphur. Calculate the emphirical formula of this compound. (3 Marks) f) State which reactant is oxidized in each of the following reactions and in each case give a reason. (4 Marks) i. 2H2S + SO2 2H2O +3S ii. 2FeCl2 + Cl2 2FeCl3 iii. SO2 +H2O +NaClO NaCl +H2SO4 iv. 2K +2H2O 2KOH+H2
g) Name the following compounds using the IUPAC system . (4 Marks)
2
CH3 C CH2 CH2 CH3
CH3
CH3
CH3 CH CH2 CH2CH2 Cl
CH3
CH3 CH CH2 CH2 CH2 Cl
OH
i)
ii)
iii)
iv)
HO
CH3
h) i) What are the structural isomers. (1 Mark) ii) An organic compound has molecular formula C5H11Cl. Write and give names of all possible structural isomers of this compound. (5 Marks)
QUESTION TWO (15 MARKS)
a) Define a buffer solution. (1 Mark) b) What characteristics properties do buffered solution possess? (2 Marks) c) Differentiate between a strong acid and a weak acid. (2 Marks) d) Calculate [H+] or [OH]- as required for each of the following solutions at 25°C and state whether the solution is neutral, acidic or basic. (4 Marks)
3
i. 1.0 × 105M ii. 10.0M + e) Calculate the PH value for each of the following solutions at 25°C . (4 Marks) i. A solution in which [H+] = 1.0 × 109M ii. A solution in which [OH]- =1.0 × 106M f) Calculate the PH and POH for each of the following solution at 25°C. (2 Marks)
i. 1.0 × 103M
QUESTION THREE (15 MARKS)
a) Write the balanced equation describing the reaction for dissolving each of the following solid in water. Also write the Ksp expression for each solid. (6 Marks) i. PbCl2 (s) ii. Ag2CrO4(s) iii. Bi2S3(s) b) The Ksp value for solid Agl(s) is 1.5 × 106 at 25°. Calculate the solubility of Agl in water at 25°. (4 Marks) c) Copper (I) bromide, CuBr has a measured solubility of 2.0 × 104/ at 25°. That is, when excess CuBr(s) is placed in 1.0L of water we can determine that 2.0 × 104 mole of the solid dissolves to produce a saturated solution. Calculate the solid Ksp value. (5 Marks)
QUESTION FOUR (15 MARKS)
a) Complete the equation to show the product of the following reactions. (10 Marks)
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