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(Sep 22 2014 at 09:45am)

Q2 d ii
As you move from left to right across a
period, the number of protons (positive
charges) in the nucleus increases. The
stronger positive charge causes the
electrons to be held more tightly. Thus,
the electron affinity increases as you
move across the period.
Electron affinity across a period is not
affected by electron shielding. This is
because, across a period, the valence
electrons are added only to the outermost
shell. The shielding electrons (those in
the inner shells) remain constant across
the period.

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(Sep 22 2014 at 09:50am)

(1g)
Conc in mol/dm3= No of moles/volume
in dm3
volume in dm3 = 250/1000 = 0.25dm3
0.02= No of moles/0.25
No of moles = 0.02 * 0.25 = 0.005mol
No of moles = mass/molar mass
0.005= mass/56
mass = 0.005 * 56 =0.28g
(1h)
Rate of reaction is defined as the ratio of
the concentration of reactant converted
or product formed to the time taken

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(Sep 22 2014 at 10:19am)

(5a)
i. contact process
ii. X= oxygen , Y= SO2
iii. 450(degree celcius), 1atm
iv. Stage II
v. Vanadium(v)oxide
vi. This is because oxides of sulphur are
insoluble in water
(5bi)
1. Density
2. Relative molecular mass
(5bii)
I. Downward delivery
II. Upward delivery
(5ci)
I. Steel = iron and carbon
II. bronze = copper and Zinc

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vandammj

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(Sep 23 2014 at 07:28am)

Help on agriculture practical please 08067041783

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(Sep 23 2014 at 09:20am)

(1a)
I- Animal Power
II- Mechanial power
III- Wind power
Iv- electrical power
(1bi)
i. it is not consistent becuase it can tire
ii. its power output is low and limited
(1bii)
These because the wind speed in the
savannah is high
(1c)
i. it can produce high electrical power
ii. its a neat source of energy
iii. it is a cheap source of electricity
(1di) II
(1dii)
i. it is mobile. (i.e) can move from one
place to another
ii. Tractors and tractor-driven implement
are used by II

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(Sep 23 2014 at 09:22am)

4) d) i) Fish oil: fish oil is recommended for a
healthy diet because it contains the omega-3 fatty
acids, eicosapentaenoic acid (EPA), and docosahexaenoic
acid (DHA), precursors to eicosanoids that reduce
inflammation throughout the body
ii) Fish sauce: is a condiment that is derived from fish
that have been allowed to ferment. It is an essential
ingredient in many curries and sauces.
iii) Isinglass: is a substance obtained from the swim
bladders of fish (especially sturgeon), it is used for the
clarification of wine and beer.

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(Sep 23 2014 at 09:22am)

(2ai)
I. Dentrification
II. Nitrification
III. Nitrification
(2aii)
Nitrites
(2aiii)
Azotobacter
(2aiv)
Decomposition
(2b)
i. NPK fertilizer
ii. Ammonium nitrate
(2c)
Capillarity: Loamy soil(medium), Clayey
soil(low), Sandy soil(high)
Texture: Loamy soil(modrate), Clayey soil
(low), Sandy soil(high)
Water Holding capacity: Loamy soil
(modrate), Clayey soil(high), Sandy soil
(low)
Ease of tillage: Loamy soil(moderately
easy to till), Clayey soil(hard to till), Sandy
soil(very easy to till)