a) The gas burns with a ‘pop’ sound
b) Lead is least reactive compared to Berylium thus the reaction is slow hence little amount of hydrogen gas.
c) Oxygen
maurice.mutuku answered the question on September 25, 2019 at 07:14
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Draw an Isomer of Pentene.
(Solved)
Draw an Isomer of Pentene.
Date posted:
September 25, 2019
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Answers (1)
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Determine the volume of 2.0M NaOH which when diluted to 250cm3 would produce a 0.8M NaOH solution.
(Solved)
Determine the volume of 2.0M NaOH which when diluted to 250cm3 would produce a 0.8M NaOH solution.
Date posted:
September 25, 2019
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Answers (1)
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The diagram below represents the structure of aluminium chloride.
(Solved)
The diagram below represents the structure of aluminium chloride.

(i) Identify the bonds labelled M and N
(ii) What is the difference between bonds M and N?
Date posted:
September 25, 2019
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Answers (1)
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The flow chart below shows a series of reactions starting withpropan-l-ol. Study it and answer the questions that follow.
(Solved)
The flow chart below shows a series of reactions starting withpropan-l-ol. Study it and answer the questions that follow.

(i) Name:
I. Process Y
II. Substances R and C
III. Process W
IV. Polymer X
(ii) Write a balanced chemical equation for the combustion of propane.
(iii) State one use of polymer X
Date posted:
September 23, 2019
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Answers (1)
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Biogas is made from natural organic waste. A from four student set –up the apparatus below to investigate the composition of the gas. He passed...
(Solved)
Biogas is made from natural organic waste. A from four student set –up the apparatus below to investigate the composition of the gas. He passed it over heated copper (II) oxide. After that he obtained two products. One was cooled in a boiling tube while the other was collected using a syringe.

(a) What is the function of calcium oxide
(b) Name product
i) P
ii) Y
(c) Give the two observations made in tube X
(d) i) Name the type of reaction taking place in tube X
ii) Write the equation for the reaction above in (d)(i)
(e) What elements are present in biogas
(f) Explain why one tube in boiling tube Q is longer than the other
Date posted:
September 23, 2019
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Answers (1)
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Study the flow chart below and answer the questions that follow
(Solved)
Study the flow chart below and answer the questions that follow

Process Y
i. Write the formula of Alcohol X, Compound Z and name process Y.
ii. Propane and Chlorine react as shown below :

a) Name the type of reaction that takes place.
b) State the condition under which this reaction takes place.
Date posted:
September 20, 2019
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Answers (1)
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Equal masses of magnesium ribbon were reacted separately with equal volumes of 1M hydrochloric acid and 1M methanoic acid. The results were plotted on a...
(Solved)
Equal masses of magnesium ribbon were reacted separately with equal volumes of 1M hydrochloric acid and 1M methanoic acid. The results were plotted on a graph as shown below. Two curves X and Y were obtained.

a) Explain which curves represents:
i) 1M hydrochloric acid.
ii) 1M Methanoic acid.
b) State the significance of point Z.
c) Write ionic equation for the reaction between magnesium and dilute hydrochloric acid.
d) Calculate the maximum mass of the gas that would be liberated if 1.2g of magnesium reacted with excess hydrochloric acid.
(Mg = 24, H =1).
e) Calculate the volume of the gas produced in (e) above at r.t.p (molar gas volume at r.t.p) = 24dm3.
Date posted:
September 20, 2019
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Answers (1)
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The arrangements below shows a set-up to investigate the effect of an electric current on molten lead (II) iodide.
(Solved)
The arrangements below shows a set-up to investigate the effect of an electric current on molten lead (II) iodide.

a) Identify two mistakes in the set-up.
b) State three observations made after correcting the mistakes.
c) What particles are responsible for electrical conductivity?
d) Write the equations for the reactions taking place at the electrodes.
e) Indicate on the diagram direction of flow of electric current.
Date posted:
September 20, 2019
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Answers (1)
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Study the set-up of apparatus below and answer the questions that follow.
(Solved)
Study the set-up of apparatus below and answer the questions that follow.

a) State and explain the observation that would be made in tube L as the experiment progresses in the first few minutes.
Observation.
Explanation.
b) How would the observations in the tube L change if the experiment is carried out for a long time. Explain using a chemical equation.
Observation.
Equation.
c) State three observations made when liquid S is reacted with sodium metal.
d) State the use of the suction pump in this experiment.
Date posted:
September 19, 2019
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Answers (1)
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When solid Zinc carbonate was added to a solution of hydrogen chloride in methylbenzene, there was no observable change.On addition of some water to the...
(Solved)
When solid Zinc carbonate was added to a solution of hydrogen chloride in methylbenzene, there was no observable change.On addition of some water to the mixture there was effervescence. Explain these observations.
Date posted:
September 19, 2019
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Answers (1)
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The diagram below shows the heating curve of a pure substance. Study it and answer the questions that follow.
(Solved)
The diagram below shows the heating curve of a pure substance. Study it and answer the questions that follow.

(a) What are the physical states of the substances at points W and Y.
(b) Explain why the temperature remains constant between points B and C.
Date posted:
September 19, 2019
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Answers (1)
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Potassium manganate (VII) reacts with chloride salts to produce chlorine. Both chlorine and potassium manganate (VII) are strong oxidizing agents. Which one of the two...
(Solved)
Potassium manganate (VII) reacts with chloride salts to produce chlorine. Both chlorine and potassium manganate (VII) are strong oxidizing agents. Which one of the two is the stronger oxidizing agent? Explain your answer
Date posted:
September 19, 2019
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Answers (1)
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When a grey powder P, which has no action on cold water is placed into a salt solution of Q, a brown solid R is...
(Solved)
When a grey powder P, which has no action on cold water is placed into a salt solution of Q, a brown solid R is deposited.
The blue solution of Q, fades giving way to a green solution.
a) Name the type of reaction that takes place.
b) Identify solids P and R
c) Write an equation for the reaction leading to formation of the brown solid.
Date posted:
September 19, 2019
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Answers (1)
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Methane gas reacts with chlorine gas as shown in the equation below.
(Solved)
Methane gas reacts with chlorine gas as shown in the equation below.

Use the bond energies in the table below to calculate the enthalpy for the above reaction.

Date posted:
September 19, 2019
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Answers (1)
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The set- up below was used to investigate the rate of diffusion of different gases.
(Solved)
The set- up below was used to investigate the rate of diffusion of different gases.

a) Explain why a coloured liquid is used in this experiment.
b) State and explain the observation made after 20 minutes.
Date posted:
September 19, 2019
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Answers (1)
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The table below gives information about some reactions of metals A,B, C and D and their rates.
(Solved)
The table below gives information about some reactions of metals A,B, C and D and their rates.

Arrange the metals in order of decreasing activity.
Date posted:
September 19, 2019
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Answers (1)
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The diagram below shows the set-up that can be used to prepare and collect oxygen gas. Study it and answer the questions that follow.
(Solved)
The diagram below shows the set-up that can be used to prepare and collect oxygen gas. Study it and answer the questions that follow.

Identify two mistakes from the diagram which must be corrected for one to collect dry oxygen gas.
Date posted:
September 19, 2019
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Answers (1)
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State the conditions under which ammonia gives the following products when heated
(i) Nitrogen and hydrogen.
(ii) Nitrogen and water.
(iii) Nitrogen (II) oxide and water.
(Solved)
State the conditions under which ammonia gives the following products when heated
(i) Nitrogen and hydrogen.
(ii) Nitrogen and water.
(iii) Nitrogen (II) oxide and water.
Date posted:
September 19, 2019
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Answers (1)
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The following diagram was used to study a property of hydrogen gas. Study it and answer the questions that follow.
(Solved)
The following diagram was used to study a property of hydrogen gas. Study it and answer the questions that follow.

a) Name the missing condition in the above set up.
b) Explain why the combustion tube is clamped in a slanting position.
c) Before lighting the gas at the end of delivery tube, hydrogen must be let to pass through until all the air is driven out. Explain.
d) State three observations that occur in the combustion tube.
e) Why was hydrogen gas burnt at point Z.
f) Why should the supply of hydrogen gas be continued while the apparatus cool.
g) What would be observed if the experiment was repeated using lead (II) oxide.
h) Other than the property investigated above, name two other chemical properties of hydrogen gas.
Date posted:
September 19, 2019
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Answers (1)
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Calculate the mass of sodium carbonate contained in 200cm3 of 0.02M sodium carbonate solution.
(Solved)
Calculate the mass of sodium carbonate contained in 200cm3 of 0.02M sodium carbonate solution.
Date posted:
September 19, 2019
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Answers (1)