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- Given that 1.5 = x = 3.8 and 2.4 = y = 5, determine the smallest and the greatest value of x – y and...(Solved)
Given that 1.5 ≤ x ≤ 3.8 and 2.4 ≤ y ≤ 5, determine the smallest and the greatest value of x – y and hence the range of x – y.
Date posted: September 19, 2019.
- A ball is kicked vertically upwards from a point 0.5m above the ground at a velocity of 16m/s. Assuming that acceleration due to gravity is...(Solved)
A ball is kicked vertically upwards from a point 0.5m above the ground at a velocity of 16m/s. Assuming that acceleration due to gravity is 10m/s2
Determine
a)An expression for its velocity t seconds later
b)An expression for its height above the ground t seconds later
c)The maximum height reached by the ball
Date posted: September 19, 2019.
- The equations show some reactions. Use the equations to answer the following questions.(Solved)
The equations show some reactions. Use the equations to answer the following questions.
(a) Name the type of reaction in step I and II.
(b) Explain why ethene burns with a more smoky flame than ethane.
Date posted: September 19, 2019.
- a)Using a ruler and a pair of compass only construct triangle ABC in which angle BAC = 120o AB = 6.4cm and AC = 7.0cm (Solved)
a)Using a ruler and a pair of compass only construct triangle ABC in which angle BAC = 120o AB = 6.4cm and AC = 7.0cm
Measure
i) angle ABC
ii) BC
b) Construct the circumscribed circle of triangle ABC with O as its centre. Describe the circumscribed circle as a locus
Date posted: September 19, 2019.
- The diagram below shows the heating curve of a pure substance. Study it and answer the questions that follow.(Solved)
The diagram below shows the heating curve of a pure substance. Study it and answer the questions that follow.
(a) What are the physical states of the substances at points W and Y.
(b) Explain why the temperature remains constant between points B and C.
Date posted: September 19, 2019.
- A particle moving along a straight line covers a distance 5 metres in time t seconds from a fixed point O on the line where...(Solved)
A particle moving along a straight line covers a distance 5 metres in time t seconds from a fixed point O on the line where s = t3 – 6t2 + 8t – 4
Find
a)The velocity of the particle when t = 5
b)The acceleration when t = 5 seconds
c)The time when the velocity of the particle is constant
Date posted: September 19, 2019.
- Mukai travels from A to B at xkm/h. The two towns are 40km apart. She then travels to town C at (x + 6)km/h. Town...(Solved)
Mukai travels from A to B at xkm/h. The two towns are 40km apart. She then travels to town C at (x + 6)km/h. Town B and C are 100km apart. If the time she takes from B to C is the same time from A to B, find the value of x
Date posted: September 19, 2019.
- Potassium manganate (VII) reacts with chloride salts to produce chlorine. Both chlorine and potassium manganate (VII) are strong oxidizing agents. Which one of the two...(Solved)
Potassium manganate (VII) reacts with chloride salts to produce chlorine. Both chlorine and potassium manganate (VII) are strong oxidizing agents. Which one of the two is the stronger oxidizing agent? Explain your answer
Date posted: September 19, 2019.
- Simplify completely(Solved)
Simplify completely
![fig2819920191115.png](/questions/uploads/fig2819920191115.png)
Date posted: September 19, 2019.
- A two-digit number is made by combining any of the two digits 1, 3, 5, 7 and 9 at random.
a)Make an array of possible combinations
...(Solved)
A two-digit number is made by combining any of the two digits 1, 3, 5, 7 and 9 at random.
a)Make an array of possible combinations
b)Find the probability that the number formed is prime
Date posted: September 19, 2019.
- When a grey powder P, which has no action on cold water is placed into a salt solution of Q, a brown solid R is...(Solved)
When a grey powder P, which has no action on cold water is placed into a salt solution of Q, a brown solid R is deposited.
The blue solution of Q, fades giving way to a green solution.
a) Name the type of reaction that takes place.
b) Identify solids P and R
c) Write an equation for the reaction leading to formation of the brown solid.
Date posted: September 19, 2019.
- Grade x and grade y sugar cost sh60 and sh50 per kilogram respectively. In what proportion must the two grades be mixed to produce a...(Solved)
Grade x and grade y sugar cost sh60 and sh50 per kilogram respectively. In what proportion must the two grades be mixed to produce a blend that cost sh53 per kilogram
Date posted: September 19, 2019.
- A student dissolved some ammonium nitrate salt in water in a glass beaker. The solution formed felt very cold.(Solved)
A student dissolved some ammonium nitrate salt in water in a glass beaker. The solution formed felt very cold.
a) Explain why the temperature of the resultant solution dropped
b) Represent the above information on an energy level diagram
c) What general name is given to such reactions
Date posted: September 19, 2019.
- A point T divides a line AB internally in the ratio 5:2. Given that A is (4,10) and B(11,3). Find the coordinates of T(Solved)
A point T divides a line AB internally in the ratio 5:2. Given that A is (4,10) and B(11,3). Find the coordinates of T
Date posted: September 19, 2019.
- Methane gas reacts with chlorine gas as shown in the equation below.(Solved)
Methane gas reacts with chlorine gas as shown in the equation below.
Use the bond energies in the table below to calculate the enthalpy for the above reaction.
![Q1591920191042.png](/questions/uploads/Q1591920191042.png)
Date posted: September 19, 2019.
- In mr Mukala’s shop, a radio has marked price of ksh10000. Mr mukala can allow a reduction of 15% on the marked price and still...(Solved)
In mr Mukala’s shop, a radio has marked price of ksh10000. Mr mukala can allow a reduction of 15% on the marked price and still make a profit of 25% on the cost price of the radio. What was the cost price of the radio?
Date posted: September 19, 2019.
- An arc of a circle radius 3.5cm is 9.1cm long. Find the angle it substends at the centre of the circle(Solved)
An arc of a circle radius 3.5cm is 9.1cm long. Find the angle it substends at the centre of the circle
Date posted: September 19, 2019.
- Solve for x(Solved)
Solve for x
![fig2019920191027.png](/questions/uploads/fig2019920191027.png)
Date posted: September 19, 2019.
- The set- up below was used to investigate the rate of diffusion of different gases.(Solved)
The set- up below was used to investigate the rate of diffusion of different gases.
a) Explain why a coloured liquid is used in this experiment.
b) State and explain the observation made after 20 minutes.
Date posted: September 19, 2019.
- Use binomial expansion to expand up to the 4th term (Solved)
Use binomial expansion to expand
up to the 4th term
Date posted: September 19, 2019.
- Use matrix method to determine the co-ordinates of the point of intersection of the two lines.
3x – 2y = 13, 2y + x + 1...(Solved)
Use matrix method to determine the co-ordinates of the point of intersection of the two lines.
3x – 2y = 13, 2y + x + 1 = 0
Date posted: September 19, 2019.
- The table below gives information about some reactions of metals A,B, C and D and their rates.(Solved)
The table below gives information about some reactions of metals A,B, C and D and their rates.
Arrange the metals in order of decreasing activity.
Date posted: September 19, 2019.
- Evaluate;(Solved)
Evaluate;
![fig1319920191012.png](/questions/uploads/fig1319920191012.png)
Date posted: September 19, 2019.
- Make t the subject of formula.(Solved)
Make t the subject of formula.
![fig1119920191009.png](/questions/uploads/fig1119920191009.png)
Date posted: September 19, 2019.
- The diagram below shows the set-up that can be used to prepare and collect oxygen gas. Study it and answer the questions that follow.(Solved)
The diagram below shows the set-up that can be used to prepare and collect oxygen gas. Study it and answer the questions that follow.
Identify two mistakes from the diagram which must be corrected for one to collect dry oxygen gas.
Date posted: September 19, 2019.
- Using logarithms evaluate;(Solved)
Using logarithms evaluate;
![fig919920191007.png](/questions/uploads/fig919920191007.png)
Date posted: September 19, 2019.
- State the conditions under which ammonia gives the following products when heated
(i) Nitrogen and hydrogen.
(ii) Nitrogen and water.
(iii) Nitrogen (II) oxide and water.(Solved)
State the conditions under which ammonia gives the following products when heated
(i) Nitrogen and hydrogen.
(ii) Nitrogen and water.
(iii) Nitrogen (II) oxide and water.
Date posted: September 19, 2019.
- (a) Calculate the turning point of the function y = x3 -3x and state their nature.
Hence sketch the curve.
(b)Find the area of each of...(Solved)
(a) Calculate the turning point of the function y = x3 -3x and state their nature.
Hence sketch the curve.
(b)Find the area of each of the two segments of the curve y = x3 -3x cut off by the x-axis
Date posted: September 19, 2019.
- The solubility of salt T at 80oC is 40g / 100g of water. What mass of T will saturate 65g of water at 80oC?(Solved)
The solubility of salt T at 80oC is 40g / 100g of water. What mass of T will saturate 65g of water at 80oC?
Date posted: September 19, 2019.
- (a) Without using a protractor or a set square, construct a parallelogram PQRS such thatPQ = 7.5cm , PS = 5cm and QPS = 67½...(Solved)
(a) Without using a protractor or a set square, construct a parallelogram PQRS such that PQ = 7.5cm , PS = 5cm and QPS = 67½ °.
On the same diagram locate:
(b) A point X such that it is equidistant from P and Q.
(c) A point M such that QMS 90°. M is on the same side of QS as R.
(d) A region inside the parallelogram in which a variable Y lies such that PY RY and QYS >90°. Shade the region represented by Y.
Date posted: September 19, 2019.