-
Find the value of k in the equation.
125k+1 + 53k = 630
Date posted:
November 6, 2019
-
The structure below represents a cleansing agent.
a) State the type of cleansing agent represented above
b) State one advantage and one disadvantage of using the above cleansing agent.
Date posted:
November 6, 2019
-
Give the IUPAC name for each of the following organic compounds;
Date posted:
November 6, 2019
-
The difference between two positive integers is 5 and the sum of their squares is 73. Find the integers.
Date posted:
November 6, 2019
-
Study the scheme given below and answer the questions that follow;
i) Name the reagents used in:
Step I:
Step II
Step III
ii) Write an equation to show products formed for the complete combustion of CH = CH
iii) Explain one disadvantage of continued use of items made form the compound formed in step III
Date posted:
November 6, 2019
-
The cost of mass production of cars is partly constant and partly varies as the number of cars produced. The total cost of making 400 cars is sh 3,740,000 and that of making 1000 cars is sh 7,100,000. Find the cost of making 2500 cars.
Date posted:
November 6, 2019
-
Solve the inequality below. Hence represent the solution on a number line.
x < 2x + 7 ≤ - 1/3x + 14
Date posted:
November 6, 2019
-
Study the schematic diagram below and answer the questions that follow:-
(i) Identify the following:
Substance Q
Substance R
Gas P
(ii) Name:
Step 1
Step 4
(iii) Draw the structural formula of the major product of step 5
(iv) State the condition and reagent in step 3
Date posted:
November 6, 2019
-
Study the scheme below and use it to answer the questions that follow:-
i) Name the following compounds:-
I. Product T ………………………… II. K ………
ii) State one common physical property of substance G
iii) State the type of reaction that occurred in step J
iv) Give one use of substance K
v) Write an equation for the combustion of compound P
vi) Explain how compounds CH3CH2COOH and CH3CH2CH2OH can be distinguished chemically
vii) If a polymer K has relative molecular mass of 12,600, calculate the value of n (H=1 C =12)
Date posted:
November 6, 2019
-
Name the compound with the formula below :
CH3CH2CH2ONa
Date posted:
November 6, 2019
-
State two factors that affect the properties of a polymer
Date posted:
November 6, 2019
-
State why C2H4 burns with a more smoky flame than C2H6
Date posted:
November 6, 2019
-
The structure below shows some reactions starting with ethanol. Study it and answer the questions that follow:
(i) Write the formula of the organic compounds P and S
(ii) Name the type of reaction, the reagent(s) and condition for the reactions in the following steps :-
(I) Step I
(II) Step II
(III) Step III
(iii) Name reagent R ……………………………………………………………
(iv) Draw the structural formula of T and give its name
(v) (I) Name compound U………………………………………………………..
(II) If the relative molecular mass of U is 42000, determine the value of n (C=12, H=1)
Date posted:
November 6, 2019
-
Machine A can complete some work in 8 hours while machine B can complete the same work in 10 hours. The two machines were set to do the work at the same time. After 3 hours, machine B broke down. Determine the time taken by machine A to complete the remaining piece of work.
Date posted:
November 6, 2019
-
PQ is a diameter of a circle is such that the co-ordinates of P and Q are (-6, -2) and (4, -2)
respectively. Find the equation of the circle in the form ax2 + by2 + cx + dy + e = 0 where a,b,c,d and
e are constants.
Date posted:
November 6, 2019
-
Give the IUPAC names of the following compounds:
Date posted:
November 6, 2019
-
Three variables P,Q and R are such that P varies directly as the cube of Q and inversely as the square root of R. If Q is increased by 20% and R is decreased by 10%, Find the percentage change in P.
Date posted:
November 6, 2019
-
Differentiate between a word and a word length as used in data representation.
Date posted:
November 6, 2019
-
Using two's complement, show how the arithmetic below would be carried out on a 8 – bit computer system. (+54) – (+29).
Date posted:
November 6, 2019
-
Study the polymer below and use it to answer the questions that follow:
(a) Give the name of the monomer and draw its structures
(b) Identify the type of polymerization that takes place
(c) State one advantage of synthetic polymers
Date posted:
November 6, 2019
-
A car rental firm leases its cars for Kshs. 2500.00 per day. The manager gives a discount based on the number of days that the car is rented. If the rental period is greater than or equals to 7 days then a 25% discount is given. Write a pseudo-code to accept a car number and the rental period, and calculate the total amount earned by the company when a car is leased.
Date posted:
November 6, 2019
-
The formula below represents active ingredients of two cleansing agents A and B
Which one of the cleansing agents would be suitable to be used in water containing magnesium hydrogen carbonate? Explain
Date posted:
November 6, 2019
-
State any two laws governing protection of information.
Date posted:
November 6, 2019
-
Distinguish between an integrated software and a software suite.
Date posted:
November 6, 2019
-
Given that A = 5i + 4j + K and B = 8i – 5j – 5k and P divides AB externally in the ratio 5:2. Find
the:-
(a) Position vector of P
(b) The magnitude of OP
Date posted:
November 5, 2019
-
Town B is 180km on a bearing 0500 from town A. Another town C is on a bearing of 1100 from town A and on a bearing of 1500 from town B. A fourth town D is 240 km on a bearing of 3200 from A. Using scale drawing, such that 1cm rep 30km,
(a) Show the relative position of the towns
(b) Using the diagram, find
(i) Distance AC
(ii) Distance CD
(iii) Compass bearing of C from D
Date posted:
November 5, 2019
-
Nairobi and Eldoret are 600km apart. At 9.20a.m. a lorry leaves Eldoret for Nairobi at a speed of 60km/hr. At 10.00a.m. a car leaves Eldoret for Nairobi at a speed of 120km/hr. After 20 minutes of travel, the car develops a mechanical problem which takes 20 minutes to repair. The car then proceeds with the journey at the same speed.
(a) Calculate the time the lorry arrived in Nairobi
(b) Find the time when the car overtakes the lorry
(c) Find the distance from Nairobi at the overtaking point
(d) Calculate how far the lorry was from Eldoret when the car reached Nairobi
Date posted:
November 5, 2019
-
The figure below shows a square based pyramid on top of a cuboid
(a) Draw the net of the solid
(b) Calculate the total surface area of the net.
Date posted:
November 5, 2019
-
Evaluate ; 36x-1 + 62x - 222 = 0
Date posted:
November 5, 2019
-
The sum of interior angles of a triangle is given by (10x -2y)0 while that of a hexagon is given by (30x + 24y)0. Calculate the values of x and y.
Date posted:
November 5, 2019