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a) B
b) PH of potassium hydroxide is higher than that of aqueous ammonia. KOH ions are
dissociated more than that of aqueous NH3
maurice.mutuku answered the question on October 11, 2019 at 10:56
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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.
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Date posted: October 11, 2019. Answers (1)
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(i) CH3CH2CH2COOH(Solved)
Name the following compounds
(i) CH3CH2CH2COOH
(iii)CH3CH2OOCCH2CH3
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(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. Answers (1)
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(Boling points; Q =98° C, T=78°C)(Solved)
The setup below was used to separate two miscible liquids Q and T
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(a) Identify the mistakes in the setup above
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Date posted: October 11, 2019. Answers (1)
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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. Answers (1)
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Date posted: October 11, 2019. Answers (1)
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Describe how the mixture of solid R, S, and V can be separated
Date posted: October 11, 2019. Answers (1)
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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. Answers (1)
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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. Answers (1)
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Date posted: October 11, 2019. Answers (1)
- Classify the following processes as chemical changes or physical changes(Solved)
Classify the following processes as chemical changes or physical changes
Process physical or chemical
Neutralization ………………………………………
Sublimation ………………………………………
Fractional distillation ………………………………………..
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Date posted: October 11, 2019. Answers (1)
- The apparatus below were used by a student to study the effect of heat on hydrated copper II sulphate(Solved)
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. Answers (1)
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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. Answers (1)
- Cooking oils comprise of a mixture of compounds which have a boiling point range
of 23oC to 27oC.
(i) What evidence is then to support the statement...(Solved)
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. Answers (1)
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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. Answers (1)
- The two elements P and R were separately burned in air, the products gave the results recorded in the table below:(Solved)
The two elements P and R were separately burned in air, the products gave the results recorded in the table below:
(a) Suggest the identity of element R.
(b) Describe how the nature of the solutions of the of the oxides were determined
Date posted: October 11, 2019. Answers (1)
- It is advisable to set a Bunsen burner to luminous flame prior to an experiment.
Explain(Solved)
It is advisable to set a Bunsen burner to luminous flame prior to an experiment.
Explain
Date posted: October 11, 2019. Answers (1)
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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 physical changes are taking place at points X and Z?
(b)Explain what happens to the melting point of sodium chloride added to this substance
Date posted: October 11, 2019. Answers (1)
- Study the information in the table below and answer questions that follow.
(Letters given are not real symbols)(Solved)
Study the information in the table below and answer questions that follow.
(Letters given are not real symbols)
Explain why the ionic radius of :-
(a) B+ is greater than that of A+
(b) C2+ is smaller than the of A+
Date posted: October 11, 2019. Answers (1)
- The diagram below shows some parts of a Bunsen burner(Solved)
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Explain how the parts labelled T and U are suited to their functions
Date posted: October 11, 2019. Answers (1)
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Date posted: October 11, 2019. Answers (1)