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The diagram below shows the contact process used in the manufacture of concentrated sulphuric(vi) acid.
a) Identify the following:
i) Substance Q formed in the burner
ii) Chamber T
iii) Substance R
iv) Substance S
ii) Write the chemical equation occurring in the dilution chamber.
iii) Why is it necessary to pass substance Q though a purifier.
iv) State one use of sulphuric (VI) acid.
Date posted:
October 11, 2019
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The diagram below shows the process used to obtain Sulphur from underground deposits.
i) Name the above process used to obtain sulphur from the underground deposits
ii) Name the substance passed through pipe
A
B
iii) State two properties of Sulphur that makes it possible to extract using the above process.
Date posted:
October 11, 2019
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The table below shows solutions A, B and C are tested and observations records as shown:
(a) Using the table above, name an acid
(b) How does the pH value of 1M potassium hydroxide solution compare with that of
1M aqueous ammonia? Explain
Date posted:
October 11, 2019
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a)Name two apparatus that can be used for determining mass in a laboratory.
(b) One of the flames produced by Bunsen burner is the luminous flame.
i) Explain why this flame is very bright
ii) State two disadvantages of the luminous flame.
(c) Air is usually one of the substances that is considered as a mixture.
(i) Identify the two most abundant component of air.
(ii) Give two reasons why the air is considered as a mixture.
(iii) One of the components of air is carbon (iv) oxide. Describe an experiment that can be used to prove the presence of carbon (iv) oxide in the air.
Date posted:
October 11, 2019
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Name the following compounds
(i) CH3CH2CH2COOH
(iii)CH3CH2OOCCH2CH3
b) Two types of detergents P and Q can be represented as
(i) Identify each type of the detergent.
(ii) Which of the two detergents is the best to use with hard water? Give a reason.
(iii) State one advantage of detergent P.
(iv) State one disadvantage of detergent Q.
(c) An hydrocarbon can be represented as follows.
(i) Identify the hydrocarbon
(ii) Name two reagents that can reacted together to generate the hydrocarbon
Date posted:
October 11, 2019
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The setup below was used to separate two miscible liquids Q and T
(Boling points; Q =98° C, T=78°C)
(a) Identify the mistakes in the setup above
(b)Identify Distillate X
Date posted:
October 11, 2019
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The grid below shows a section of the periodic table, the letters are not the actual chemical symbol
a) Name the family into which element P belongs to.
b) Which two elements forms the most soluble carbonates
c) With a reason, identify elements in period 3 with the largest atomic radius
d) Write the formula of the compound formed between Q and M
e) State two uses of element R and for each use , state property of element R that makes lts possible for the use
(i) Use
Property
(ii) Use
Property
f) Using dots and cross ,show bonding in the compound formed between R and oxygen.
g) In terms of structure and bonding explain why the oxides of element Thas relatively low boiling points
Date posted:
October 11, 2019
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Given a mixture of lead (II) oxide, ammonium chloride and sodium chloride, describe how this mixture can be separated to obtain a sample of each.
Date posted:
October 11, 2019
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Study the information below and answer the questions that follow:
Describe how the mixture of solid R, S, and V can be separated
Date posted:
October 11, 2019
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The set-up below was used to separate a mixture:-
(a) Name the apparatus missing in the set-up
(b) Give one example of mixture T
(c) What is the name of this method of separation
Date posted:
October 11, 2019
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A student left some crushed fruit mixture with water for some days. He found the mixture had fermented. He concluded that the mixture was contaminated with water and ethanol with boiling point of 100oC and 78oC respectively. The set-up of apparatus below are used to separate the mixture.
(i) Name the piece of apparatus labelled W
(ii) What is the purpose of the thermometer in the set-up?
iii) At which end of the apparatus W should tap water be connected?
(iv) Which liquid was collected as the first distillate? Explain
(v) What is the name given to the above method of separating mixture?
(vi) State two applications of the above method of separating mixtures
(vii) What properties of the mixture makes it possible for the component to be separated by the above methods?
Date posted:
October 11, 2019
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Find the BCD equivalent of 3710
Date posted:
October 11, 2019
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Workout using two’s complements
5710 – 2910
Date posted:
October 11, 2019
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State two criteria for determining the purity of a substance
Date posted:
October 11, 2019
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Workout the equivalent of the following
1001110.100112 = X10
Date posted:
October 11, 2019
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Classify the following processes as chemical changes or physical changes
Process physical or chemical
Neutralization ………………………………………
Sublimation ………………………………………
Fractional distillation ………………………………………..
Displacement reaction …………………………………………
Date posted:
October 11, 2019
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Describe three factors that cause system entropy
Date posted:
October 11, 2019
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a)Study the Pseudo code below and answer the questions that follows.
BEGIN
Print “enter the value of A and B”;
Read A, B
Y = A+B
While Y<20 Do
BEGIN
PRINT Y
A = B
B = Y
Y = B+A
END WHILE
PRINT A, B, Y;
END
i)Assuming the user keys in 2 and 4 when prompted to enter the values for A and B respectively, determine the values of A, B and Y show your working
ii)State the control structures used in the above pseudocode.
b)Draw a flowchart that would be used in place of the pseudocode
c)Give three examples of Iteration construct
Date posted:
October 11, 2019
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The apparatus below were used by a student to study the effect of heat on hydrated copper II sulphate
(a) What is the role of the ice cold water
(b) Name liquid P
(c) What observation is made in the boiling tube
Date posted:
October 11, 2019
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What is Piconet?
Date posted:
October 11, 2019
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What is thesaurus?
Date posted:
October 11, 2019
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State one role of a Webmaster.
Date posted:
October 11, 2019
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Describe two situations in the bus transport industry where computerized systems could replace human employees.
Date posted:
October 11, 2019
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A form 1 student carried out the separation as shown in the set-up below:-
(i) Identify the method above.
(ii) Give one of its disadvantages
(iii) Name a mixture which can be separated by the set-up above
Date posted:
October 11, 2019
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How does an operating system manage computer memory?
Date posted:
October 11, 2019
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Cooking oils comprise of a mixture of compounds which have a boiling point range
of 23oC to 27oC.
(i) What evidence is there to support the statement that cooking oil is a mixture?
(ii)Name another experimental technique that could be used to confirm your answer in part (i) above
Date posted:
October 11, 2019
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The following information relate to J.’J traders for the year ended 31st Dec 2010
i)Prepare a trading and profit/ loss account for the year ended 31/12/2010.
ii)Calculate;
a)Current ratio
b)Rate of stock turnover
c)Margin percentage
Date posted:
October 11, 2019
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Without using any laboratory chemical, describe a simple laboratory experiment to distinguish between calcium hydrogen carbonate and sodium hydrogen carbonate.
Date posted:
October 11, 2019
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Highlight five reasons why the output approach underestimates the gross domestic product
Date posted:
October 11, 2019
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Explain five ways in which legal requirements can affect a business and its operations
Date posted:
October 11, 2019