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Che0100:Chemistry. Question Paper

Che0100:Chemistry.

Course:Diploma In Agriculture

Institution: Meru University Of Science And Technology question papers

Exam Year:2013

QUESTION ONE (30 MARKS)
a) State three basic assumptions made by Dalton on atomic theory. (3 Marks) b) Define a base according to Arhenius. (2 Marks) c) Using the ??,?? ?? notations write the electronic configuration for the following elements
(4 Marks)
i. Sodium (atomic number 11) ii. Phosphorous (atomic number 15) iii. Aluminium (atomic number 13) iv. Manganese (atomic number 25) v. Zinc (atomic number 30) d) The wavelength of a certain radiation was ?? = 3.4 × 10-5m. Calculate the energy for the radiation in joules. (4 Marks) e) Distinguish between electro negativity and electron affinity. (2 Marks) f) Ionization energy increases from Na, Mg, to Al. Explain (2 Marks) g) (2 Marks) h) Calculate the pH of 0.03M nitric acid. (3 Marks)
2
i) Write the structural formula for the following organic compounds. (3 Marks) i. 2 chloro, 2,3-dimethylbutane ii. 2,3-dimethylpent-2-ol iii. 3-methylhexanoic acid j) Outline the failures of Neils Behr atomic model. (3 Marks) k) What is a redox reaction? (2 Marks)
QUESTION TWO (15 MARKS)
a) The solubility of silver bromide in water is 7.0 × 10-7???????? ????-3 at 25°??. Calculate its solubility product. (4 Marks) b) i) What are isomers? (2 Marks) ii) Draw and name the positional isomers in 2-methylhex-1-ene. (3 Marks) c) Define the term ionization energy. (2 Marks) d) What is the pH of 0.01mol/dm3 of benzoic acid (C6H5COOH), given that Ka(C6H5COOH)= 6.4 × 10-5??????/????3. (4 Marks)
QUESTION THREE (15 MARKS)
a) Define the term buffer solution. (2 Marks) b) Chloric (I) acid (hypochlorous acid is a weak acid Ka(HClO)= 3.2 × 10-8??????/????3. i. Calculate [H+] and [OH-] in 1.25 × 10-2M HClO. (3 Marks) ii. What is the pH of 1.25 × 10-2M HClO? (2 Marks) c) State the properties of the four quantum numbers. (8 Marks)
QUESTION FOUR (15 MARKS)
a) Name the following organic compounds. (5 Marks) i) CH3CH2NH2
v) HO CH2CH2CH2 OH
iii) CH3CH
H C CH2
iv) CH3CHCH3
NH2 v) HO CH2CH2CH2 OH b) Draw a clearly labeled diagram for the atomic spectra of hydrogen as observed in the Balmer series. (4 Marks) c) Distinguish between mole and molarity. (2 Marks)
3
d) A 1.0g sample of limestone was allowed to react with 100cm3 of 0.2MHCl acid. The excess acid required 24.8cm3 of 0.1M NaOH solution. Calculate the percentage by mass of calcium carbonate in limestone. (4 Marks)
QUESTION FIVE (15 MARKS)
a) What is meant by the term functional group in organic chemistry? (2 marks) b) Complete the table below by stating the Homologous Series. (7 Marks) Functional group Name of Homologous Series OH NH2
C OH
O
C C
C C
C
O
H
R
C
R
O
c) State giving a reason the oxidized species in the following chemical reactions. (6 Marks) Cu2+(aq) +Zn(s) Cu(s) +Zn2+(aq) 2K(s) + 2H20(l) 2KOH(aq) + H2(g) MnO4 - aq +8H+(aq) Mn2+(aq) +5Fe3+(aq) +4H2O(l)

Che0100:Chemistry. Question Paper

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