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When lead (II) carbonate reacts with dilute hydrochloric acid, very little carbon (iv) oxide is produced.Explain
Date posted:
May 21, 2019
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When a Bunsen burner is lit below wire gauze, it is noted the flame initially burns below the gauze
as shown in the figure below.
After sometime, the flame burns below as well as above the gauze as shown in
Explain this observation
Date posted:
May 21, 2019
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An immersion heater rated at 180W is placed in a liquid of mass 2kg. When the heater is switched on for 7.5 minutes the temperature of the liquid rises by 400C. Determine the specific heat capacity of the liquid.
Date posted:
May 21, 2019
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Other than oil patch being monolayer, state any one other assumption in the oil drop experiment.
Date posted:
May 21, 2019
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Estimate the size of an oil molecule if a drop of oil of volume 6.0 × 10-10 m3 forms a patch of 32 on a water surface.
Date posted:
May 21, 2019
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The following figure shows a rod made of wood on one end and metal on the other end
suspended freely with a piece of thread so that it is in equilibrium.
The side made of metal is now heated with a Bunsen flame. State with a reason, the side to
which the rod is likely to tilt
Date posted:
May 21, 2019
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Given the equation for reaction below
Calculate
(i) Volume of chlorine at (r.t.p) required to react with 3g of Aluminium (Molar gas volume at r.t.p = 24litres, Al = 27, Cl = 35.5).
(ii) Mass of Aluminium chloride formed.
Date posted:
May 21, 2019
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A stone of mass 40g was completely immersed in a liquid. The level of liquid are shown in the figure
Determine the density of the stone in SI units
Date posted:
May 21, 2019
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In the clothing and textile industries the machines experience electrostatic forces at certain points. Suggest one method of reducing these forces
Date posted:
May 21, 2019
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Write the formula of the complex ion formed when excess ammonia gas is passed through a solution containing Zn2+ ions.
Date posted:
May 21, 2019
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The apparatus below was a set up to show the catalytic oxidation of ammonia. Study the diagram and answer the questions that follow.
(i) Write an equation for the reaction that takes place in the gas jar.
(ii) Why is it necessary to have a hot nichrome wire in the gas jar.
Date posted:
May 21, 2019
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State the particles responsible for conductivity of an electric current in
(i) Solution
(ii) A metal
Date posted:
May 21, 2019
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The scheme below shows a series of reactions starting with Propanol. Study it and answer the questions that follow.
(a) (i) Name the type of reaction in steps I and II
(b) Write the equation for the reaction that takes place in Step III
(c) Name substances labeled A,C,D and E
(d) Draw the structural formula of product C .
(e) Name the process in Step (IV).
(f) Name compound B and state the type of reaction involved in its formation
Name of compound B……………………………………………………………
Type of reaction………………………………………………………………….
(g) If the relative molecular mass of B is 35,700 determine the value of n
Date posted:
May 21, 2019
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The question needs a student to understand and appreciate what different communities believed
Date posted:
May 20, 2019
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The graphs below represents the temperature-time curves for solids M and N
(a) What is the name given to the curves above?.
(b) Which of the two solids is an impure substance? Explain.
Date posted:
May 20, 2019
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Nelly’s lungs can hold 2500cm3 of air at 37oC and 1 atmosphere. What would be the pressure if this air was put in a bottle of capacity 500cm3 at 27oC?
Date posted:
May 20, 2019
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Explain why galvanized iron objects are better protected even when scratched.
Date posted:
May 20, 2019
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Painting, oiling, galvanizing or tin-plating are methods of preventing rusting.Explain how these methods are similar in the way they prevent rusting.
Date posted:
May 20, 2019
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The following set up was used to react steam with Iron Powder.
(a) The water was heated before heating the iron powder. Explain why this was necessary.
(b) Write an equation for the reaction that took place between steam and iron powder
(c) State how gas L would be collected without using water.
Date posted:
May 20, 2019
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25cm3 of 0.1m sulphuric (VI) acid required 20cm3 of sodium carbonate solution for complete neutralization. Calculate the concentration of sodium carbonate in moles per litre.
Date posted:
May 20, 2019
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Identify SEVEN ways through which parents can develop a child’s spiritual life.
Date posted:
May 20, 2019
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Using dots (•) and cross (x) show the bonding in hydroxonium ion
Date posted:
May 20, 2019
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A compound W react with chlorine to form another compound Y whose structural
formula is as follows:
(i) Give the name and structural formula of Compound W
(ii) What type of reaction leads to the formation of compound Y from compound W.
Date posted:
May 20, 2019
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Draw the structure of the following compounds:
(i) 2 – Methyprop-1-ene
(ii) Hexan – 2- ol
Date posted:
May 20, 2019
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A mixture contains sodium chloride, ammonium chloride, and silver chloride. Explain how
you can obtain pure samples of each salt.
Date posted:
May 20, 2019
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State and explain the observations made when sodium metal is put into a boiling tube containing propan–l-ol
Date posted:
May 20, 2019
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Raw rubber is heated with sulphur in the manufacture of natural rubber.
(i) What name is given to the process?
(ii Why is the process necessary.
Date posted:
May 20, 2019
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A wire was connected to a battery and was found that the energy converted to heat was 30J when 20C of charge flowed through the wire in 5 seconds. Calculate;
i) The p.d between the ends of the wire
ii) The current flowing through the wire
iii)The resistance of the wire
iv)The average power development in the wire
Date posted:
May 20, 2019
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Sketch a simple diagram that contains a capacitor, a two way switch, and a load resistor that can be used for charging and discharging a capacitor.
Date posted:
May 20, 2019
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Below is a flow chart. Study it and answer the questions that follow: -
(i) Name the process in step I
(ii) Name compound R
Reagent Y
(iii) Write equation for the reaction in step II
(c) Explain why 0.1 M hydrochloric acid has a pH of 1 while 0.1M ethanoic acid has a pH of 3
Date posted:
May 20, 2019