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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:2014

QUESTION ONE – (30 MARKS)
(a) Define the following terms: (6 Marks) (i) Isotope (ii) Buffer solution (iii) Stoichimetic equation
(b) Using s,p,d notation, write the electronic configuration for the following atoms. (4 Marks) (i) Oxygen (atomic number, 8) (ii) Sodium (atomic number, 11) (iii) Phosphorous (atomic number 15) (iv) Chromium (atomic number, 24)
(c) Calculate the number of moles present in 4.1g of magnesium hydroxide . ( = 24, = 16 = 1). (2 Marks)
2
(d) State four basic assumptions (4 Marks) (e) Calculate the PH of 0.1M 24 solution. (3 Marks) (f) What is meant by the term acid according to Lewis Theory? (2 Marks) (g) Write the IUPAC names of the following organic compounds. (5 Marks)
CH3 CH2 CH CH CH2 CH CH3
CH3
CH3 CH2 CH2
CH3
OH
CH3 C CH2 CH2
Br
CH3 CH2
CH3
HOOCCH2 CH2 COOH
CH3CH2NH2
(i)
(ii)
(iii)
(iv)
(v)
3
(h) What are P-block elements? (2 Marks) (i) State two agricultural uses of calcium oxide. (2 Marks)
QUESTION TWO – (15 MARKS)
(a) Draw the shapes of the following orbitals. (4 Marks) (i) 1S – orbital (ii) 2Py – orbital
(b) Distinguish between a weak and a strong acid. (4 Marks) (c) Explain the following observations (i) Melting point of Aluminium is higher than that of Magnesium. (2 Marks) (ii) Propane has a higher melting and boiling points than Ethane. (2 Marks) (iii)Ethanol is soluble in water. (2 Marks) (iv) Ionization energy of sodium is higher than that of Potassium. (1 Mark)
QUESTION THREE – (15 MARKS)
(a) Calculate the of 0.2M Magnesium hydroxide. (3 Marks) (b) Distinguish between electronegativity and electron affinity. (4 Marks) (c) A certain electromagnetic radiation absorbs at a wavelength of 2.0 × 104. Calculate its (i) Wave number, 1 (2 Marks) (ii) Frequency in (3 Marks) (iii)Energy in KJ (3 Marks)
QUESTION FOUR – (15 MARKS)
(a) State four assumptions made in the Bohr atomic model. (4 Marks) (b) What is a redox reaction. (1 Mark) (c) State four common uses of ethane gas. (4 Marks) (d) Discus any three quantum numbers outlining their significance. (6 Marks)

Che0100:Chemistry. Question Paper

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