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Chemistry (Chem 101) Question Paper

Chemistry (Chem 101)

Course:Education

Institution: Kenya Methodist University question papers

Exam Year:2013

TIME : 2 HOURS

INSTRUCTIONS:
Answer question one and two other questions
Question One
General periodic table have a total of four blocks
Show the blocks using a sketch
(4 Marks)
Explain the reason for a maximum of 2, 6, 10 and 14 elements in each block label in your sketch
(10 marks)
Chemical and physical properties are directly affected by the atomic radius of an element
Name the affected property
Give the reason for the observation
(4 marks)
Write the electronic configuration for the following
(8 Marks)
20Ca
25Mn
17Cl
8O2-

Question Two
Explain the meaning of the following
Covalent bond
Ionic bond
Metallic bond
H-bonding bond
(12 Marks)

Question Three
Name the molecules below
(6 marks)
H3PO4
H38O3
CaSO4
Write the chemical formulae for the following
Diphosphorouspentoxide
Ammonium phosphate
(4 marks)
Calculate
The total number of atoms in 5.3 x10-10 moles of sodium nitrate (Na=23, N=14; O-16)
(3 marks)
Sodium vapor lamps are sometimes used for public lighting. They give a yellowish light with a wavelength of 5.89nm. What is the frequency of this radiation?
pH of a 0.2M solution
(3 Marks)

Question Four
A rocket fuel is said to contain 87.42% nitrogen and 12.58% hydrogen. Determine the chemical formula and name the compound
(6 Marks)
A buffer solution was prepared which had a concentration of 0.20mol/dm-3 in ethanol acid and 0.10 mol/m-3 in sodium ethanol. If the Ka for ethanol acid is 1.74x10-5mol dm-3
Calculate the (H+) ions and pH for the buffer solution (8 marks)
Titration reveals that 11.6 ml of 30m sulfuric acid are required neutralise the sodium hydroxide in 25.00ml of N-OH solution. Determine the molarity of the NaOH solution
(6 marks)

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