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Three resistors of resistance 2.0 Ω, 4.0 Ω and 6.0 Ω are connected together in a circuit.
Draw a circuit diagram to show the arrangement of the resistor which Gives:
(i) Effective resistance of 3.0 Ω
(ii) Minimum resistance
Date posted:
March 27, 2019
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The set up was used to prepare dry hydrogen gas. Study it and answer the questions that follow.
i) Is set-up used to prepare the gas correct? Give reason.
(ii) What would be liquid Y?
(iii) Give two physical properties of hydrogen gas
Date posted:
March 27, 2019
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Relative molecular mass of methane and water are almost similar, however the boiling of water is 1000C while that of methane is -1610C. Explain.
Date posted:
March 27, 2019
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The structure of water molecules can be represented as shown below.
Name the bond type represented by letter X and W.
Date posted:
March 27, 2019
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The diagram below shows spots of pure substances A, B and C on a chromatography paper. Spot D is that of a mixture.
After development, A, B and C were found to have moved 8cm, 3cm and 6cm respectively. D had separated into two spots which had moved 6cm and 8cm.
(i) On the diagram
I. Label baseline
II. Show the positions of all the spots after development.
(ii) Identify the substances present in the mixture D.
Date posted:
March 27, 2019
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Use the information given below to draw the energy cycle diagram for the enthalpy of formation of propane.
Date posted:
March 27, 2019
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The PH of a soil sample was found to be 5.7. An agricultural officer recommended addition of lime. State two functions of the lime.
Date posted:
March 27, 2019
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You are provided with the following; A cell and holder, a switch, a rheostat, an ammeter, a voltmeter and connecting wires. Draw a diagram for a circuit that could be used to investigate the variation of the potential difference across the cell with the current drawn from the cell.
Date posted:
March 27, 2019
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An element X has a relative atomic mass of 88. When a current of 0.5 ampere was passed through a fused chloride of X for 32 minutes 10 seconds, 0.44g of X was deposited.
(i) Determine the charge of element X [1 Faraday = 96500C]
(ii) Write the formula of hydroxide of X
Date posted:
March 27, 2019
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A form two student in an attempt to prevent rusting put copper and zinc in contact with iron as shown below.
(i) State what would happen in set up X and Y after one week.
(ii) Explain your answer in diagram Y.
Date posted:
March 27, 2019
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Figure below shows three point sources of light with an opaque object placed between them and the screen.
Explain the nature of the shadow formed along B and C.
Date posted:
March 27, 2019
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The strip placed n a pivot and kept in equilibrium by forces as shown in figure below
(i) Determine the value of F and R
(ii) X is the distance from the end of the plank to the point of application of force F. Force F is now applied at various points nearer to the pivot so that x increases. Equilibrium is maintained all the time. On the axes provided sketch the relation between force F and x.
(iii) Give a reason for the answer in (ii) above
Date posted:
March 27, 2019
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Volume of liquids can be measured using a pipette; measuring cylinder or burette. Explain which one would be best for measuring 29.1cm3 of liquid.
Date posted:
March 27, 2019
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0.318g of an oxide of metal M was completely reduced by hydrogen gas to 0.254g of metal. Calculate empirical formula of the metal oxide. (M = 63.5, O = 16)
Date posted:
March 27, 2019
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The volume of a gas at 300C and 780mmHg is 400cm3. What will be its volume at 500C at 600mmHg.
Date posted:
March 27, 2019
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A machine of velocity ratio 45, overcomes a load of 4.5 x 103N when an effort of 135N is applied.
Determine:
(i) The mechanical advantage of the machine
(ii) Efficiency of the machine
(iii) The percentage of the work that goes to waste.
Date posted:
March 27, 2019
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15g of sodium chloride was dissolved in 120cm3 of distilled water. Calculate the concentration of the resulting solution in moles per litre. (Na = 23, Cl = 35.5)
Date posted:
March 27, 2019
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Figure below shows part of a hydraulic press. The plunger is the position where effort is applied while the Ram piston is the position where load is applied. The plunger has cross-section area, a m2 while the Ram piston has cross section area, a m2.
When the plunger moves down a distance d the Ram piston moves up a distance D.
(i) State the property of liquid pressure on which the working of the hydraulic press works.
(ii) Derive an impression for the velocity ratio (V.R) in terms of A and a.
Date posted:
March 27, 2019
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Study the diagram below and answer the questions that follow.
(i) What is the purpose of passing tap water through the air aspirator?
(ii) State and explain the observation that would be made in tube M after sometime.
Date posted:
March 27, 2019
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The diagram below shows a burning jiko. Study it and answer the questions that follow.
(a) Write the equation for the reaction taking place in region A.
(b) Name the gas produced at region B.
(c) State ONE use of the gas named in (b) above.
Date posted:
March 27, 2019
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The table below gives some elements in the periodic table. Use it to answer the questions that follow. The letters do not represent the actual symbols of the elements.
(a) A metallic element which forms ions with the smallest ionic radius? Explain
(b) A non metallic element with the largest atomic size? Explain.
Date posted:
March 27, 2019
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The curves below represent the volume of carbon (IV) oxide gas evolved once 2M(concentrated) hydrochloric acid was reacted with 100g of powdered calcium carbonate and also when 1M concentrated hydrochloric acid was reacted with the same quantity of carbonate.
(i) Which of the two curves represents the reaction of 2M concentrated HCl with powdered calcium carbonate. Give a reason.
(ii) Why do the two curves flatten at the same level of production of CO2.
Date posted:
March 27, 2019
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The scheme below shows some reactions starting with ethyne. Study it and answer the questions that follow.
(a) Name substance X and N
(b) Name reagent M
(c) Ethene undergoes polymerization to form a polymer. Give an equation for the reaction and name the product.
(i) Equation;
(ii) Name:
Date posted:
March 27, 2019
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Calculate the volume of oxygen produced when 10g of silver nitrate was completely decomposed by heating at (s.t.p) (Ag =108, N = 14, O = 16) Molar gas volume at s.t.p = 22.4dm3)
Date posted:
March 27, 2019
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100cm3 of methane gas diffused through a porous partition in 40 seconds. How long would it take 90cm3 of ozone gas to diffuse through the same partition? (C = 12, H = 1, O = 16)
Date posted:
March 27, 2019
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The diagram below shows part of Solvay Process.
(a) Name solid P
(b) State the process taking place in chamber N.
(c) State two uses of calcium chloride which is a by-product in this process.
Date posted:
March 27, 2019
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A glass of juice of 200 ml content is such that the ratio of undiluted juice to water is 1: 7 Find how many diluted glasses can be made from a container with 3 litres undiluted juice
Date posted:
March 27, 2019
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The masses of equal volumes of a certain liquid and of water were found to be mv and mw respectively. Given that the density of water is 1gcm-3, express the density, p, of the liquid in terms of mv mw (show your work)
Date posted:
March 27, 2019
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The cost of 3 plates and 4 cups is Shs. 380. 4 plates and 5 cups cost Shs. 110 more than this. Find the cost of each item.
Date posted:
March 27, 2019
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The diagram below shows a set up which was used by student to investigate effect of electricity on solid Molten Lead (II) Bromide. Study it and answer the questions that follow.
(a) (i) State and explain the observation at the anode when the switch is switched on.
(ii) What precaution should be taken when carrying out this experiment?
(iii) Write the equation of the reaction taking place at the Anode.
(iv) Why are graphite electrodes used in the experiment?
(v) On the diagram, indicate the direction of flow of electrons.
(vi) The students noted that the bulb only produced light after the Lead (II) Bromide had melted. Explain this observation.
(b) State the difference in conduction of electric current between Molten Lead (II) Bromide and Lead Metal.
(c) Explain why it is not advisable to store Copper (II) Sulphate solution in a can made of Zinc metal.
(d) State two applications of electrolysis.
Date posted:
March 27, 2019