-
Which one of the animals belong to the same group as rhino in a food chain?
A. Lion
B. Antelope
C. Mould
D. Vulture
Date posted:
October 16, 2019
-
Potassium nitrate crystals in a test-tube were heated strongly for some time. State the observation made:
(a) When a glowing splint is introduced into the test-tube during the heating
(b) At the end of the heating
Date posted:
October 16, 2019
-
Study the flow chart below and answer the questions that follow
a) Identify ;
i) gases C and B
ii) Ions likely to be presented in solid A
Date posted:
October 16, 2019
-
A piece of marble chips was strongly heated in air for about 30 minutes. Some drops of water were added drop by drop to the product when it was still warm.
Using equation, explain:
(i) What happens when the piece of marble chips is heated?
(ii) The reaction that takes place when water is added to the final warm product.
Date posted:
October 16, 2019
-
A student poured sodium iodide solution into a small portion of solution Q, a yellow precipitate was formed.
Which ion was most likely in solution Q?
Date posted:
October 16, 2019
-
Find the standard deviation of the given data.
Date posted:
October 16, 2019
-
When exposed to air, crystals of hydrated sodium carbonate loses water of crystallizations;-
(i) Name this process
(ii) Write the formula of hydrated sodium carbonate
Date posted:
October 16, 2019
-
Evaluate 
Date posted:
October 16, 2019
-
If a = 3 i + 2j + 5k and b = i – j – k find |2a - 3b|
Date posted:
October 16, 2019
-
Change the subject of f=
to L
Date posted:
October 16, 2019
-
Find the equation of a normal to the curve y = 2x2 – 4x + 2 at point (3, 1)
Date posted:
October 16, 2019
-
You are provided with the following:- solid lead (II) nitrate, magnesium oxide powder,dilute sulphuric (VI)acid and distilled water. Describe how you can prepare a dry sample of lead (II) sulphate
Date posted:
October 16, 2019
-
The scheme below shows some reactions starting with magnesium oxide. Study it and answer the questions that follow:-
(i) Name the reagents used in steps 2 and 4
(ii) Write an equation for the reaction in step 3
(iii) Describe how a solid sample of anhydrous magnesium carbonate is obtained in step 5
Date posted:
October 16, 2019
-
Find the value of x in log10 (2x - 1) + log10 3 – log10 (8x - 1)
Date posted:
October 16, 2019
-
Two fruit juices A and B are mixed together. Juice A costs sh. 50 per litre and Juice B cost sh. 80 per litre. Find the ratio of A and B in the mixture if the mixture costs sh. 59 per litre.
Date posted:
October 16, 2019
-
Write the expression below in surd form and rationalize the denominator.
Date posted:
October 16, 2019
-
The displacement, S metres of a moving particle from point O, after t seconds is given by:
S = t3 – 5t2 + 3t + 10
a)Find S when t = 2
b)Determine:
i)The velocity of the particle when t = 5sec
ii)The value of t when the particles is momentarily at rest
c)Find the time, when the velocity of the particle is maximum.
Date posted:
October 16, 2019
-
A trader bought 2 cows and 9 goats for a total of ksh. 98,200. If she had bought 3 cows and 4 goats,
she would have spent ksh. 2200 less
a)Form two equations to represent the above information.
b)Use matrix method to determine the cost of a cow and that of a goat.
c)The trader later sold the animals she had bought making a profit of 30% per cow and 40% per goat.
i)Calculate the total amount of money she received.
ii)Determine, correct to 4 significant figures the percentage profit the trader made from the sale of the animals.
Date posted:
October 16, 2019
-
Starting with sodium oxide, describe how a sample of crystals of sodium hydrogen carbonate may be prepared
Date posted:
October 16, 2019
-
Study the information in the table below and answer the questions that follow:-
(a) Complete the table by filling in the blank spaces (i) , (ii) (iii), and (iv)
(b) Identify the particles which are electrically charged
Date posted:
October 16, 2019
-
A motorist left Embu for Nairobi, a distance of 240km, at 8.00a.m and travelled at an average speed of 90km/h. Another motorist left Nairobi for Embu at 8.30a.m and travelled at 100km/h. Find:
a)The time they met.
b)How far they met from Nairobi.
Date posted:
October 16, 2019
-
The figure below represents a cone of height 12cm and base radius of 9cm from which a similar smaller cone is removed, leaving a conical hole of height 4cm.
a)Calculate:
i) The base radius of conical hole.
ii)The volume, in terms of π of the smaller cone that was removed.
b)i) Determine, slant height of the original cone
ii)Calculate, in terms of π the surface area of the remaining solid after the smaller cone is removed.
Date posted:
October 16, 2019
-
The table below shows properties of period three chlorides
Explain why AlCl3 solid has a much lower boiling point than MgCl2 solid
Date posted:
October 16, 2019
-
Below is a table oxides of some period three elements
(a) Give the systematic name of Cl2O
(b) Explain why Na2O exists as a solid whereas SO2 is a gas at room temperature
Date posted:
October 16, 2019
-
Without using a calculator, evaluate, giving your answer as a fraction in its simplest form
Date posted:
October 16, 2019
-
In the figure below, the tangent ST meets chord VU produced at T. Chord SW passes through the centre O, of the circle and intersects chord VU at X. Line ST = 12cm and UT = 8cm.
a)Calculate the length of chord VU.
b)If WX = 3cm and VX : XU = 2 : 3, find SX.
Date posted:
October 16, 2019
-
In terms of structure and bonding, explain why diamond is the hardest naturally occurring substance
Date posted:
October 16, 2019
-
Use the scheme to answer the questions that follow:
(a) Identify solid N
(b) Write a balanced equation for the formation of Q
(c) Write the formula of the complex ion formed when sodium hydroxide is added to solution L in excess
Date posted:
October 16, 2019
-
Triangle A1B1C1 is the image of triangle ABC under the transformation represented by the matrix 
If the area of triangle A1B1C1 is 140cm2, find the area of triangle ABC.
Date posted:
October 16, 2019
-
Simplify the expression:
Date posted:
October 16, 2019