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- a) Give the names of the following compounds:
i) CH3CH2CH2CH2OH
ii) CH3CH2COOH
iii) CH3C – O- CH2CH3(Solved)
a) Give the names of the following compounds:
i) CH3CH2CH2CH2OH
ii) CH3CH2COOH
iii) CH3C – O- CH2CH3
Date posted: November 6, 2019.
- A shopkeeper sells two types of chewing gum. Big G and Orbit. Each big G costs sh. 3 and each orbit costs sh. 4. The...(Solved)
A shopkeeper sells two types of chewing gum. Big G and Orbit. Each big G costs sh. 3 and each orbit costs sh. 4. The shopkeeper has put aside sh. 300 for the purchase of gums. He needs at least twice as many Big G as Orbit and there must be at least 50 Big G and at least 20 orbit. Let x represent the number of Big G and y the number of orbit the shopkeeper purchases.
(a) Write down all the inequalities representing the information
(b) Represents the inequalities in (a) graphically
(c) The shopkeeper makes a profit of sh. 1.00 on each big G and sh. 1.50 on each orbit.
(i) Find the number of gums of each type that would give him maximum profit
(ii) Hence find the maximum profit
Date posted: November 6, 2019.
- The table below shows income tax rates
Mr. Kiprono is employed and housed by a company. For which he pays a normal rent of Sh. 2000....(Solved)
The table below shows income tax rates
Mr. Kiprono is employed and housed by a company. For which he pays a normal rent of Sh. 2000. He earns a basic salary of Ksh. 32,000 pm. He is also given taxable allowances amounting to ksh. 8480.
(a) Calculate his taxable income in K£
(b) Determine his total income tax in Ksh.
(c) If he pays a monthly water bill of Ksh. 350, electricity bill of Ksh. 400 and is a member of a cooperative
and pays Ksh. 2500 pm. Determine his net monthly income.
Date posted: November 6, 2019.
- Study the schematic diagram below and answer the questions that follow:-(Solved)
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:-(Solved)
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(Solved)
Name the compound with the formula below :
CH3CH2CH2ONa
Date posted: November 6, 2019.
- Mr. Karanja owns a bicycle which he sometimes rides to go to work. Out of the 21 working days in a
month, he only rides to...(Solved)
Mr. Karanja owns a bicycle which he sometimes rides to go to work. Out of the 21 working days in a
month, he only rides to work for 18 days. If he rides to work, the probability that he is bitten by a
rabid dog is 4/15 otherwise its only 1/13. When he is bitten by the dog, the probability that he will get
treatment is 4/5 and if he does not get treatment the probability that he will get rabies is 5/7.
(a) Draw a tree diagram to show the events
(b) Using the tree diagram in (a) above, determine the probability that
(i) Karanja will not be bitten by a rabid dog
(ii) He will get rabies
(iii) He will not get rabies if he does not get treatment
Date posted: November 6, 2019.
- State two factors that affect the properties of a polymer(Solved)
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(Solved)
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:(Solved)
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...(Solved)
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.
- Solve for x in the equation.
6sin2 x - cos x – 5 = 0
for 00 = x = 360(Solved)
Solve for x in the equation.
6sin2 x - cos x – 5 = 0
for 00 ≤ x ≤ 360
Date posted: November 6, 2019.
- The third term and the sixth term of a geometric series are 3 1/3 and 11 1/4 respectively. Calculate the
(a) Common ratio
(b) First term(Solved)
The third term and the sixth term of a geometric series are 3 1/3 and 11 1/4 respectively. Calculate the
(a) Common ratio
(b) First term
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...(Solved)
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:(Solved)
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...(Solved)
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.
- Point P(X0N, 300E) and Q(X0N, 500E) are 1935 km apart. Taking R = 6370km and ?? = 22/7,
Find the value of x.(Solved)
Point P(X0N, 300E) and Q(X0N, 500E) are 1935 km apart. Taking R = 6370km and 𝜋 = 22/7,
Find the value of x.
Date posted: November 6, 2019.
- Draw a diagram to show a system that is controlled through feedback.(Solved)
Draw a diagram to show a system that is controlled through feedback.
Date posted: November 6, 2019.
- Why is feedback necessary in a system?(Solved)
Why is feedback necessary in a system?
Date posted: November 6, 2019.
- What is absolute ethanol?(Solved)
(a) What is absolute ethanol?
(b) State two conditions required for process G to take place efficiently
Date posted: November 6, 2019.
- Explain the following system characteristics
(i) System control
(ii) Sub-systems(Solved)
Explain the following system characteristics
(i) System control
(ii) Sub-systems
Date posted: November 6, 2019.
- Explain the difference between Trojan horse and Hoax viruses.(Solved)
Explain the difference between Trojan horse and Hoax viruses.
Date posted: November 6, 2019.
- Computer can fail to work due to problems associated with operating system. Explain how the following problems can be corrected.
(i) Run time problems
(ii) Corrupted...(Solved)
Computer can fail to work due to problems associated with operating system. Explain how the following problems can be corrected.
(i) Run time problems
(ii) Corrupted registry
Date posted: November 6, 2019.
- State the meaning of the following operating systems terms:
(i) Interrupt
(ii) Trouble shooting.
(iii) Clock speed.(Solved)
State the meaning of the following operating systems terms:
(i) Interrupt
(ii) Trouble shooting.
(iii) Clock speed.
Date posted: November 6, 2019.
- Differentiate between a word and a word length as used in data representation.(Solved)
Differentiate between a word and a word length as used in data representation.
Date posted: November 6, 2019.
- Using one's complement, perform the following binary arithmetic leaving the answer in decimal notation.
11012 - 1001012 (Solved)
Using one's complement, perform the following binary arithmetic leaving the answer in decimal notation.
11012 - 1001012
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).(Solved)
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:(Solved)
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...(Solved)
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.
- Give one reason to the growth of communication industry in Kenya.(Solved)
Give one reason to the growth of communication industry in Kenya.
Date posted: November 6, 2019.