Get premium membership and access questions with answers, video lessons as well as revision papers.
- Explain the following terms as used in desktop publishing.(Solved)
Explain the following terms as used in desktop publishing.
a. Embedded object.
b. Autoflow.
Date posted: November 14, 2019.
- The formula =$M30+Q$20 was typed in cell R15 and then copied to cell M24 of a spreadsheet. Write the formula as it appears in cell...(Solved)
The formula =$M30+Q$20 was typed in cell R15 and then copied to cell M24 of a spreadsheet. Write the formula as it appears in cell M24.
Date posted: November 14, 2019.
- An element E has relative atomic mass of 69.39. Given that the element has two isotopes of atomic masses 60.15 and 70.15. Calculate the relative...(Solved)
An element E has relative atomic mass of 69.39. Given that the element has two isotopes of atomic masses 60.15 and 70.15. Calculate the relative abundance of each of the isotopes
Date posted: November 14, 2019.
- Three teachers James, John and Aggrey agreed contribute money to buy a plot. James contributed 1/5 of the total money, John contributed 2/5 of 3/5...(Solved)
Three teachers James, John and Aggrey agreed contribute money to buy a plot. James contributed 1/5 of the total money, John contributed 2/5 of 3/5 of the total money. Aggrey contributed 1/4 of what James had contributed. If the total sum contributed by Aggrey and John was Ksh.87, 000. Find the amount needed to buy the plot.
Date posted: November 14, 2019.
- Makau,Wanjiru and Kemboi start a race at 9.03 a.m in the same direction to run round a circular Course. Makau makes the circuit in 252...(Solved)
Makau,Wanjiru and Kemboi start a race at 9.03 a.m in the same direction to run round a circular Course. Makau makes the circuit in 252 seconds, Wanjiru in 308 seconds and Kemboi in 198 seconds. If they start from the same point, at what time will they next be all at the starting point together?
Date posted: November 14, 2019.
- Evaluate:(Solved)
Evaluate:
![fig8141120191245.png](/questions/uploads/fig8141120191245.png)
Date posted: November 14, 2019.
- Use an energy cycle diagram to calculate the enthalpy of formation of ethane, given;(Solved)
Use an energy cycle diagram to calculate the enthalpy of formation of ethane, given;
![Q24111420191233.png](/questions/uploads/Q24111420191233.png)
Date posted: November 14, 2019.
- In the equation below, identify the substance that acts as a base in the backward reaction. Explain your answer.(Solved)
In the equation below, identify the substance that acts as a base in the backward reaction. Explain your answer.
![Q23111420191209.png](/questions/uploads/Q23111420191209.png)
Date posted: November 14, 2019.
- State any two factors which affect the rate of chemical reaction.(Solved)
State any two factors which affect the rate of chemical reaction.
Date posted: November 14, 2019.
- What is meant by ‘rate of reaction?(Solved)
What is meant by ‘rate of reaction?
Date posted: November 14, 2019.
- The figure below is a cuboid ABCDEFGH such that AB = 8cm, BC = 6cm and CF 5cm.
Determine
(a) the length
(i) AC
(ii) AF
(b)...(Solved)
The figure below is a cuboid ABCDEFGH such that AB = 8cm, BC = 6cm and CF 5cm.
Determine
(a) the length
(i) AC
(ii) AF
(b) The angle AF makes with the plane ABCD.
(c) The angle AEFB makes with the base ABCD.
Date posted: November 14, 2019.
- 20.0 cm3 of a solution containing 2.7g/dm3 of an alkali XOH completely reacted with 25.0 cm3 of 0.045M sulphuric (VI) acid. Calculate the relative atomic...(Solved)
20.0 cm3 of a solution containing 2.7g/dm3 of an alkali XOH completely reacted with 25.0 cm3 of 0.045M sulphuric (VI) acid. Calculate the relative atomic mass of X. (O=16, H=1)
Date posted: November 14, 2019.
- (a) Draw the graph of the function
y = 10+3x – x2 for –2 = x = 5
(b) use of the trapezoidal rule with 5...(Solved)
(a) Draw the graph of the function
y = 10+3x – x2 for –2 ≤ x ≤ 5
(b) use of the trapezoidal rule with 5 stripes, find the area under the curve from x = -1 to x = 4.
(c) Find the actual area under the curve from x = -1 to x = 4.
(d) Find the percentage error introduced by the approximation.
Date posted: November 14, 2019.
- A bag contains 3 red, 5 white and 4 blue balls. Two balls are picked without replacement. Determine the probability of picking.
(a) 2 red balls...(Solved)
A bag contains 3 red, 5 white and 4 blue balls. Two balls are picked without replacement. Determine the probability of picking.
(a) 2 red balls
(b) Only one red ball
(c) At least a white ball
(d) Balls of same colour.
Date posted: November 14, 2019.
- Sulphur (IV) oxide gas was bubbled through acidified potassium dichromate (VI) solution. Acidified barium nitrate solution was then added to the mixture. Explain the observations...(Solved)
Sulphur (IV) oxide gas was bubbled through acidified potassium dichromate (VI) solution. Acidified barium nitrate solution was then added to the mixture. Explain the observations made.
Date posted: November 14, 2019.
- (a) Complete the table for y = Sin x + 2 Cos x.
(b) Draw the graph of y = Sin x + 2 cos x....(Solved)
(a) Complete the table for y = Sin x + 2 Cos x.
(b) Draw the graph of y = Sin x + 2 cos x.
(c) Solve sin x + 2 cos x = 0 using the graph.
Date posted: November 14, 2019.
- Use the information in the table to answer the questions that follow.(Solved)
Use the information in the table to answer the questions that follow.
A mixture containing 34g of CuSO4 and 70g of AgNO3 in 100g of water at 70oC was cooled to 30oC.
a. Which salt crystallized out?
b.Calculate the mass of the crystals formed.
Date posted: November 14, 2019.
- Substance A and B reacted to form a gaseous product AB3 as shown in the following equation below.(Solved)
Substance A and B reacted to form a gaseous product AB3 as shown in the following equation below.
The figure below shows how the percentage of gas AB3 in the equilibrium mixture changes with temperature.
(a) Explain how the percentage of AB3 gas changes as shown in the figure.
(b) On the axes below, sketch a graph showing how percentage of AB3 gas at equilibrium with the mixture changes with pressure.
Date posted: November 14, 2019.
- In an experiment, a mixture of 126.0 cm3 nitrogen and 120.0 cm3 hydrogen gases was heated in the presence of iron catalyst. Determine the composition...(Solved)
In an experiment, a mixture of 126.0 cm3 nitrogen and 120.0 cm3 hydrogen gases was heated in the presence of iron catalyst. Determine the composition of the resultant gaseous mixture.
Date posted: November 14, 2019.
- A polymer has the following structure;(Solved)
A polymer has the following structure;
Give the name of the monomer for the polymer above, and draw its structure.
Date posted: November 14, 2019.
- Give the systematic names of the following:(Solved)
Give the systematic names of the following:
![Q911142019820.png](/questions/uploads/Q911142019820.png)
Date posted: November 14, 2019.
- Evaluate without using logarithm tables.
3 log10 2 + log10 750 – log10 6(Solved)
Evaluate without using logarithm tables.
3 log10 2 + log10 750 – log10 6
Date posted: November 13, 2019.
- On map of scale 1:25000 a forest has an area of 20cm2. What is the actual area in Km2.(Solved)
On map of scale 1:25000 a forest has an area of 20cm2. What is the actual area in Km2.
Date posted: November 13, 2019.
- Simplify(Solved)
Simplify
![fig45131120191609.png](/questions/uploads/fig45131120191609.png)
Date posted: November 13, 2019.
- The matrices A re such that AB = A + B Find a, b, and c.(Solved)
The matrices A
re such that AB = A + B Find a, b, and c.
Date posted: November 13, 2019.
- Eighteen labourers dig a ditch 80m long in 5 days. How long will it take 24 labourers to dig a ditch 64 m long?(Solved)
Eighteen labourers dig a ditch 80m long in 5 days. How long will it take 24 labourers to dig a ditch 64 m long?
Date posted: November 13, 2019.
- Make b the subject of the formula.(Solved)
Make b the subject of the formula.
![fig39131120191539.png](/questions/uploads/fig39131120191539.png)
Date posted: November 13, 2019.
- Find cos x – Sin x, if tan x= ¾ and 90o = x = 360o.(Solved)
Find cos x – Sin x, if tan x= ¾ and 90o ≤ x ≤ 360o.
Date posted: November 13, 2019.
- Factorise x2 – y2, hence evaluate 32822 - 32722(Solved)
Factorise x2 – y2, hence evaluate 32822 - 32722
Date posted: November 13, 2019.
- (a) After t seconds, a particle moving along a straight line has a velocity of Vm/s and an
acceleration of (5 – 2t)m/s². the particles initial...(Solved)
(a) After t seconds, a particle moving along a straight line has a velocity of Vm/s and an
acceleration of (5 – 2t)m/s². the particles initial velocity is 2m/s.
(i) Express V in terms of t.
(ii) Determine the velocity of the particle at the beginning of the third second.
(b) Find the time taken by the particle to attain maximum velocity and the distance it covered to attain the maximum velocity.
Date posted: November 13, 2019.