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Diamond and silicon (IV) Oxide have a certain similarity in terms of structure and bonding.
State it
Date posted:
October 16, 2019
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Which group of plants below consists of green non-flowering plants?
A. Maize, sugar cane, rice
B. Mucor, bracket tree, lichens
C. Grass, liverworts, millet
D. Fern, moss, cypress
Date posted:
October 16, 2019
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Ahmed made a rain gauge and dug a hole in the ground to place it. The reason why he dug it into the ground is to.
A. Collect a large amount of rain water
B. Prevent water from the ground from splashing into the funnel
C. Reduce the rate of evaporation
D. Reduce its visibility
Date posted:
October 16, 2019
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Study the diagram below and use it to answer the questions that follow.
(a) State the observation made in the combustion tube.
(b) Write an equation for the reaction that took place in the combustion tube
(c) Give one use of P
Date posted:
October 16, 2019
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Below is part of a flow diagram for the contact process:
(a) Name :
I. Liquid Y
II. Liquid N
(b) Write the equation for the reaction taking place in;
I. Chamber Q
II. Chamber R
Date posted:
October 16, 2019
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Chebet a standard seven girl was asked by her teacher to mix the following liquids; water, kerosene, spirit, oil and milk. How many layers were formed?
A. Five B.Three
C. Two D. Four
Date posted:
October 16, 2019
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Standard five pupils were asked to name the parts of a fish as shown below W, X, Y and Z respectively.
Date posted:
October 16, 2019
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The diagram show an experiment for investigating electrical conduction in lead (II) fluoride. Study it and answer the questions that follow:
(a) On the diagram
(i) Label the anode and the cathode
(ii) Complete the diagram by indicating the condition that is missing but must be present for
electrical conduction to take place.
(b) Why is it necessary to leave a gap between the cork and the boiling tube?
(c) State the observations that are expected at the electrodes during electrical conduction and at the experiment
(d) Write equations for the reactions that take place at the electrodes
(e) Why should this experiment be carried out in a fume chamber?
Date posted:
October 16, 2019
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Study the scheme below and answer the questions which follow:
Identify ;
(i) The cation present in solid S
(ii) The anion in solid S
(iii) Write an equation to show how solid S is heated in process T
Date posted:
October 16, 2019
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Starting with barium carbonate solid, dilute sulphuric acid and dilute nitric acid,describe how you would prepare dry barium sulphate solid
Date posted:
October 16, 2019
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Which parasites attack both poultry and rabbits?
A. mites and fleas
B. mites and lice
C. lice and ticks
D. ticks and mites
Date posted:
October 16, 2019
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Heat reaches the feet of a person seated by the side of a fire by
A. Conduction
B. Convection
C. Radiation
D. Convection and radiation
Date posted:
October 16, 2019
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Differentiate between Electrolyte and non-electrolyte
Date posted:
October 16, 2019
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The two forms of energy that do not require any medium for transmission are?
A. heat and electricity
B. light and heat
C. sound and light
D. light and electricity
Date posted:
October 16, 2019
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The set-up was used to electrolyse Lead (II) bromide. Study it and answer the questions that follow;
(a) Write an ionic equation for the reaction that occurred at the cathode
(b) State and explain what happened at the anode
Date posted:
October 16, 2019
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In an experiment the following solids were provided to form three students; Ca(NO3)2(s),NaH2PO4(s); Mg(OH)Cl(s) and Fe(NH4)2(SO4)2. 6H2O. They were then told to dissolve the
given solids in differently in 20ml of water.
(a) Classify the given salts accordingly
(b) (i) Explain the process which takes place when FeCl3 is dissolved in water
(ii) A student placed a moist litmus paper on the product in (i) above. State and explain the observation made
Date posted:
October 16, 2019
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Name the process which takes place when:
(a) Anhydrous iron (III) chloride absorb water vapour from the air to form solution
(b) Zinc chloride vapour changes directly to zinc chloride solid
Date posted:
October 16, 2019
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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
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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
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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
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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
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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
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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
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Write the expression below in surd form and rationalize the denominator.
Date posted:
October 16, 2019
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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
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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
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Starting with sodium oxide, describe how a sample of crystals of sodium hydrogen carbonate may be prepared
Date posted:
October 16, 2019
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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
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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
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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