(i) H2O , it donates a proton (H+)
(ii) Sodium hydroxide reacts with H+
The orange/yellow colour fades since the equilibrium shifts to the right.
maurice.mutuku answered the question on September 5, 2019 at 08:48
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An organic compound Y was analysed and found to contain carbon, hydrogen and oxygen only. 1.29g of Y on complete combustion gave 2.64g of carbon (IV) oxide and 0.81g of water. Find the empirical formula of Y. (C = 12, H = 1, O = 16).
Date posted: September 5, 2019. Answers (1)
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(a) (i) Draw the structure of M.
(ii) To which type of cleansing agent does M belong?
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Study the flow chart below and answer the questions that follow.
(a) Identify solid N.
(b) Write down the equation for the reaction that leads to the formation of solution Q from the white precipitate G.
(c) State the property of precipitate G that is demonstrated by Step 1 and 2.
Date posted: September 5, 2019. Answers (1)
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Study it and answer the questions that follow.(Solved)
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Study it and answer the questions that follow.
(a) On the diagram;
(i) Label the cathode.
(ii) Show the direction of movement of electrons.
(b) Write an equation for the reaction that takes place at the anode.
Date posted: September 5, 2019. Answers (1)
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Calculate the enthalpy change of hydrogenation of ethene.
Date posted: September 5, 2019. Answers (1)
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(i) State the elements which are metals.
(ii) Identify the strongest reducing agent. Give a reason.
Date posted: September 5, 2019. Answers (1)
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Date posted: September 5, 2019. Answers (1)
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(a) Write electron arrangement of the ion of Z.
(b) (i) Write the formula of the compound formed between W and X.
(ii) Name the bond(s) and structure of the compound in (i) above.
Date posted: September 5, 2019. Answers (1)
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Study the flow chart below and answer the questions that follow.
(a) Give the names of the following.
(i) Solid P
(ii) Solid U
(iii) Solid T
(b) Write the equation for the reaction taking place in Step I.
(c) Write the equation for the reaction between concentrated hydrochloric acid and solid P.
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Date posted: September 5, 2019. Answers (1)
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Date posted: September 5, 2019. Answers (1)
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Date posted: September 5, 2019. Answers (1)
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Determine the change...(Solved)
During electrolysis of aqueous copper (II) sulphate using copper electrodes, a current of 0.2 amperes was passed through the cell for 5 hours.
Determine the change in mass of the cathode that occurred as a result of the electrolysis process
(Cu = 64, IF = 96,500C).
Date posted: September 5, 2019. Answers (1)
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(i) When the switch was closed, a gas was produced at electrode B.
Which electrode is the anode?
(ii) Write the half equation for the reaction at electrode B.
(iii) What happens to the PH of the electrolyte above during electrolysis? Explain.
(iv) If carbon electrodes were replaced with copper electrodes in the cell above, write the equations for the reaction that would occur at the anode.
Date posted: September 5, 2019. Answers (1)
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(i) Which element is likely to be hydrogen? Give a reason for your answer?
(ii) What is 
the strongest reducing agent?
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Date posted: September 5, 2019. Answers (1)
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(ii) What is the relationship between 
Date posted: September 5, 2019. Answers (1)
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A student from Nyeri High School wanted to determine the enthalpy change of combustion when a hydrocarbon with the formula C6H14 was burnt. The following are the results of the experiment done.
Mass of water = 100g
Initial temperature = 18.0ºC
Final temperature = 58.0ºC
Mass of the hydrocarbon burned = 0.43g
Specific heat capacity of water = 4.2Jg-1k-1
(a) Write a balanced equation for the combustion of the hydrocarbon.
(b) (i) Calculate the amount of heat given out in kJ when 0.43g of the hydrocarbon burn in air.
(ii) Calculate the number of moles of the hydrocarbon that were burnt.
(iii) Calculate the molar enthalpy of combustion of the hydrocarbon.
(c) The theoretical value of the heat released when 1 mole of the hydrocarbon is burnt is 4194.7kJ/mol-1 Give two reasons why the value obtained from this experiment is less than the theoretical value.
Date posted: September 4, 2019. Answers (1)
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The grid given below represents part of the periodic table. Study it and answer the questions that follow. Letters do not represent the actual symbols of the elements.
(i) What name is given to the group of elements to which C and F belong?
(ii) Which letter represents the element that is the least reactive?
(iii) What type of bond is formed when B and E react? Explain.
(iv) Write the formula of the compound formed when D and oxygen gas reacts.
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Date posted: September 4, 2019. Answers (1)
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(i) Write an equation involving hot charcoal and dry carbon (IV) oxide gas.
(ii) Name gas X and state one chemical property of the gas.
Date posted: September 4, 2019. Answers (1)