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When the oxide of metal Z is heated in the presence of metal X, it is reduced.
The oxide of metal X is reduced by metal Y. Arrange the three metals in order of increasing reactivity.
Date posted:
September 4, 2019
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Study the information in the table below and answer the questions that follow:
A mixture containing 40g salt G and 120g salt Y in 100g of water at 80ºC was cooled to 50ºC.
(a) Which salt crystallized out? Give reason.
(b) Calculate the mass of the salt that crystallized out.
Date posted:
September 4, 2019
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Calculate the molar enthalpy of formation of ethyne (C2H2) given the following.
Date posted:
September 4, 2019
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The points P(1,5) Q(2,2) R(1,1) and S(4,2) are vertices of a quadrilateral PQRS
(a) On the grid provided, draw the quadrilateral PQRS
(b) On the same grid draw P1Q1R1S1 the image of PQRS under a rotation of positive quarter turn about the origin. State the co-ordinates of P1Q1R1 and S1
(c) The point P11Q11R11S11 are the images of P1Q1R1S1 under a reflection in the x-axis. On
the same grid draw quadrilateral P11Q11R11S11 and state its co-ordinates
(d) Quadrilateral P11Q11R11S11 is the image of PQRS under a certain reflection. On your graph draw the mirror line LL for the reflection and state its equation
Date posted:
September 4, 2019
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In an experiment to investigate the conductivity of a substance a student used the set up shown below. The student noticed that the bulb did not light.
(i) What had been omitted in the set up?
(ii) Explain why the bulb lights up when the omission is corrected.
Date posted:
September 4, 2019
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The figure below is a solid frustrum of a rectangular based pryramid AB=12cm, BC=10cm, EF=6cm FG=5cm, FB=8cm and vertical height 6cm.
(a) Calculate the volume of the frustrum
(b) Calculate the surface area of the frustrum
Date posted:
September 4, 2019
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The probability of Onyancha, Nyamusi and Jemima hitting the bull’s eye are 
respectively.
(a) Draw a probability tree diagram showing this possible outcomes
(b) Find the probability that;
(i) All hit the bulls eye
(ii) Only one of them hit the bull’s eye
(iii) At most one misses the bull’s eye
Date posted:
September 4, 2019
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A passenger train travelling at 25km/hr is moving in the same direction as the truck travelling at 30km/hr. the railway line runs parallel to the road and the track takes 1 ½ to overtake the train completely
(a) Given that the truck is 5 metres long determine the length of the train in metres
(b) The track and the train continue moving parallel to each other at the original speeds. Calculate the distance between them after 4 minutes and 4 seconds after the track overtake the train
(c) The track stopped 45 minutes after overtaking the train. How long did the train take to catch up with the truck
Date posted:
September 4, 2019
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Describe how a solid sample of lead (II) sulphate would be prepared using the following reagents: dilute nitric (V) acid, lead (II) carbonate solid sodium sulphate and distilled water.
Date posted:
September 4, 2019
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Four towns A,B,C and D are such that B is on a bearing of 247o and 6km from A. C is due SSE and 4.8km from B. D is to the south of A and the bearing of C from D is S44oW
(a) Make a scale drawing showing the relative positions of A,B,C and D using the scale 1cm represents 1km
(b) Use your drawing to determine
(i) The bearing of A from C
(ii) The distance between C and D
(iii) How far D is east of B
(c) The average speed of a cyclist from C to A if he takes 30 minuets between A and D and 20 minutes between D and A
Date posted:
September 4, 2019
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The following results were obtained in an experiment to determine the heat of neutralization of 50cm3 2M hydrochloric acid and 50cm3 2M sodium hydroxide.
Mass of plastic cup = 45.1g
Initial temperature of acid = 27.00C
Initial temperature of alkali = 23.00C
Mass of plastic cup + HCl + NaOH = 145.1g
Temperature of the mixture of acid and alkali = 38.50C
(a) Define heat of neutralization
(b) Write an ionic equation for the neutralization of hydrochloric acid and sodium hydroxide.
(i) The amount of heat produced during the experiment
(Specific heat capacity of solution = 4.2jg-1k-1, density of solution = 1gcm3)
(ii) Molar heat of neutralization for the reaction.
(c) Explain why the molar heat of neutralization of NaOH and Ethanoic acid of equal volume and molarity would be less than the value obtained in C (ii) above.
(d) Write down the thermochemical equation for reaction between NaOH and dilute hydrochloric acid
above
(e) Draw an energy level diagram for the neutralization reaction in (d) above.
Date posted:
September 4, 2019
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A cold water tap can fill a bath in 3 minutes while a hot tap can fill in 5 minutes. The drain pipe can empty the bath in 3 ¾ minutes. The two taps and the drain pipe are fully open for 2 minutes, after which the drain pipe is closed.
(a) What fraction of the bath is filled after the first two minutes
(b) How many seconds are required for the bath to be completely filled?
(c) Given that the cold water tap delivers water at the rate of 200cm3/s
Determine
I. The capacity of the bath in litres
II. The rate of flow of the hot water tap
Date posted:
September 4, 2019
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Three years ago, James was three times as old as his Peter. In five years time, the sum of their ages will be 76. Determine their present ages
Date posted:
September 4, 2019
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In the figure below, AB is parallel to DE, DE bisects angle BDG, angle DCF=60o angle CFG=110o
Find
(a) angle CDF
(b) angle ABD
Give reasons for your answers
Date posted:
September 4, 2019
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A contractor was to finish a piece of work in 80 days. He employed 150 workers to work for 6 hours a day. After 30 days he found out that only a quarter of the work had been done. How many more workers did he require to finish the work in time
Date posted:
September 4, 2019
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The resistance to the motion of a car is partly constant and partly varies as the square of the speed. At
40km/h-1 the resistance and at 60kmh-1 it is 730N. What will be the resistance at 70kmh-1?
Date posted:
September 4, 2019
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Solve for x and y in the simultaneous equations given below
21x-12y=-29
12x+5y=19
Date posted:
September 4, 2019
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A line Ax +3y-6=0 is perpendicular to the line 5x+7y-k=0. If 5x+7y-k=0 passes through the point (4,3). Determine the values of A and K
Date posted:
September 4, 2019
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The chart shows the extraction of lead from its ore.
(a) Write the chemical formula of the chief ore.
(b) Name the possible impurities present in the ore.
(c) Why is it necessary for the ore to be converted into powder form?
(d) Identify process X and state it‟s significance
(e) Write equations for the reaction taking place in the
I. Roasting furnace
II. Formation of substance B
It is not advisable to use lead pipes in transporting drinking water.
Explain why.
(f) Identify one of the impurities present in molten lead obtained by the process.
(g) State one use of lead
Date posted:
September 4, 2019
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The following information relates to Amani Traders for the period ended 30th April 2012.
Prepare Amani Traders‘ Trading Account.
Date posted:
September 3, 2019
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Using a diagram illustrate the effects of a positive shift of a demand curve on the equilibrium point, price and quantity.
Date posted:
September 3, 2019
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State four reasons why short message services (SMS) is replacing letters as a way of communication.
Date posted:
September 3, 2019
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State the unit of carriage for each of the following modes of transport.
Date posted:
September 3, 2019
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Ndovu bought 200 blankets at Sh.500 each on credit. The terms of sale were 20% trade discount, 10% quantity discount and 5% cash discount if payment is made within two weeks. Calculate the amount paid if payment is made after one week.
Date posted:
September 3, 2019
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Using a diagram illustrate the effects of a rightward shift in supply curve on equilibrium price and quantity.
Date posted:
September 3, 2019
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The following trial balance was extracted from Milka traders on 31st Dec 2015.
Additional information;
Closing stock was sh. 22000
Prepare Milka traders Trading, profit and loss account for the year ending 31/12/2015.
Date posted:
September 3, 2019
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The flow chart shows some chemical reactions.
(a) Draw the structural formula and names of the following compounds.
(b) Write the name of the processes that leads to the formation of substances A and F.
(c) Name the type of reaction and conditions required for the formation Step 1
(d) If the relative molecular mass of compound X is 84000 units, determine the value of n (C = 12, H = 1)
(e) Write an equation that leads to the formation of substance E.
(f) State and explain the observation made when substances F and CH2=CH2 are burnt in excess air.
Date posted:
September 3, 2019
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A form one student crushed banana leaves with water and left the mixture for some days. He found that the mixture had fermented. He suspected that the mixture had been contaminated with ethanol which has a boiling point of 780C while water has a boiling point of 1000C. The student then set up the apparatus below to separate the mixture.
(i) Name the piece of apparatus labelled B.
(ii) What is the purpose of the thermometer in the set up?
(iii) At what point of apparatus B should the tap water be connected. Explain.
(iv) Name the part labelled A and state its function
(v) Which liquid was collected first? Explain
(vi) What is the name given to the above method of separating mixtures?
(vii) What property of the components of the mixture makes it possible for the components to be separated by the method?
(viii) State two applications of the above method of separation.
(b) A form two student was supplied with a liquid suspected to be water.
(i) Describe one chemical test that would be carried out to show that the liquid was water.
(ii) How would it have been proved that the liquid is pure water?
Date posted:
September 3, 2019
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Outline four ways in which firms contribute to National income of a country.
Date posted:
September 3, 2019
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Two circles of radii 3.5cm and 4.2cm with centres O1 and O2 respectively intersect at points A and B as shown in the figure below. The distance of the centres is 6cm.
Calculate
(a) angle AO1B to the nearest degree
(b) angle AO2B to the nearest degree
(c) Area of the quadrilateral O1AO2B, correct to 2 decimal places.
(d) The shaded area correct to two significant figures.(Take π =22/7)
Date posted:
September 3, 2019