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Chem 00111: Physical And Inorganic Chemistry Question Paper
Chem 00111: Physical And Inorganic Chemistry
Course:Certificate In Animal Health And Production
Institution: Chuka University question papers
Exam Year:2013
CHUKA
UNIVERSITY
UNIVERSITY EXAMINATIONS
EXAMINATION FOR THE AWARD OF CERTIFICATE
IN ANIMAL HEALTH AND PRODUCTION
CHEM 00111: PHYSICAL AND INORGANIC CHEMISTRY
STREAMS: CERT (ANHE) TIME: 2 HOURS
DAY/DATE: FRIDAY 9/8/2013 11.30 AM – 1.30 PM
INSTRUCTIONS:
Answer Question ONE and any other TWO
1. (a) State the following laws /principle [8 marks]
(i) Graham’s
(ii) Gay-Lussac’s
(iii) Hess’s
(iv) Conservation of energy
(b) Compare the three states of matter in terms of flowing and intermolecular distances. [6 marks]
(c) What is a weak acid? Give two examples. [3 marks]
(d) State and explain reactivity of group 1 A elements down the group. [3 marks]
(e) Find the relative rates of diffusion of ammonia and hydrogen chloride if the two gases diffuses under similar conditions H=1,N=14,Cl=33.5
[4 marks]
(f) How many grams of sulphur contain 6.0×?10?^22 atoms?
(S-32,L_A=6.0×?10?^23)
[2 marks]
(g) When 5g of a compound was dissolved in 100ml of water, the temperature of the water rose from 25? to 29?. If the relative molecular mass of the compound was 40, find the molar heat of this solution. (c=4.2 kJK^(-1) ) and density of solution = 1g/?cm?^3
[4 marks]
2. (a) An element x has four isotopes x-14,x-15,x-16 and x-17 with relative abudance 75%, 15%, 8% and 2% respectively. Determine the atomic mass of s. [3 marks]
(b) (i) Using sodium and chlorine as examples, explain how ionic bond is formed (Sodium atomic no 11 and chlorine 17) [4 marks]
(ii) State three properties of ionic compounds. [3 marks]
(c) Describe how period three elements react with oxygen mentioning the type of oxide formed in each case. [10 marks]
3. (a) State Charle’s law and explain it using kinetic theory of gases. [4 marks]
(b) A gas occupies 200cm3 at 25? and 760 mmHg. What would be its new
(i) Volume if its temperature is increased to 40? ?
(ii) Pressure if it is compressed to 100cm3 [6 marks]
(c) How many moles, molecules and atoms are contained in 7g of nitrogen gas (N=14,L=6.0×?10?^23) [6 marks]
(d) A compound is made up of 92.3% carbon and the rest is hydrogen. Given that its molar mass is 104, find its molecule formula. [4 marks]
4. (a) State and briefly explain the factors that affect chemical equilibrium.
[8 marks]
(b) State three general properties of acids and three of bases. [6 marks]
(c) Briefly explain the meaning of system, activation energy, and equilibrium constant. [6 marks]
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