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Form 3 Chemistry Paper 2 End of Term 2 Examination 2022

Class: Form 3

Subject: Chemistry

Level: High School

Exam Category: Form 3 End Term 2 Exams

Document Type: Pdf

    

Views: 406     Downloads: 24

Exam Summary

CHEMISTRY PAPER 2FORM 3
TERM 2 2022
TIME: 1HOUR 20MINS
Name………………………………………………ADM NO……………..CLASS……………….
1. The diagram below shows the apparatus for the preparation of gas A and investigate on its properties . Study it and answer the questions that follow.
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a) (i) Name gas A. …………………………
(1 mark)
(ii)Suggest the property of gas A under investigation. (1 mark)
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(iii) Write chemical equations for the reactions in the;
Boiling tube I (1 mark)
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Combustion tube II (1 mark)
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b) (i) State and explain the observation made in
Tube I. (2 marks)
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- Combustion tube II (2 marks)
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c) What is the use of hydrated copper (II) sulphate in the experiment. (1 mark)
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(ii) Name one other substance that comes out of tube III. (1 mark)
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(iii) Name liquid W. (1 mark)
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(iv) What is the role of sodium chloride in the ice (freezing mixture) (1 mark)
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(v) Explain why hydrogen gas has been replaced by helium in filling of aeroplanetyres.
(1 mark)
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2. a) Study the information in the table below and answer the questions that follow. (The letters do not represents the actual symbols of the element)
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i) What is the general name given to the group to which elements P, Q, and R belong (1mk)
………………………………………………………………………………………………………………………………………………………………………………………………………………
ii) What is meant by ionization energy? (1mk)
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iii) Explain why element P has highest ionization energy. (1mk)
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iv) When a piece of element R is placed in water, it sinks and a hissing sound is produced. Explain (2mks) ………………………………………………………………………………………………………………………………………………………………………………………………………………
v) Write a chemical equation for the reaction between element Q and cold water. (1mk) ………………………………………………………………………………………………………………………………………………………………………………………………………………
b) A burning piece of element R was lowered into a gas jar full of chlorine gas as shown below.
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i) Name the piece of apparatus labelled S. (1mk) ………………………………………………………………………………………………………………………………………………………………………………………………………………
ii) Calculate the volume of chlorine gas required to react completely with 0.67g of R at room temperature.
(R.A.M of R = 40, molar gas volume at r.t.p.= 24 dm3) (3mks)
c) Below is a table with some properties of chlorine and oxides of some elements in period three of the periodic table. Use it to answer the questions that follow.
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i) The atomic radii of the elements in the periodic table decreases from left to right. Explain (1mk) ……………………………………………………………………………………………………………………………………………………………………………………………………………… ii) Identify the chlorides which;
I) Forms a dimmer ( 1mk) ………………………………………………………………………………………………………
II) Forms a neutral solution with water. (1mk) ……………………………………………………………………………………………………… III) Forms an acidic solution with water and is not a metallic chloride.( 1 mk) ………………………………………………………………………………………………………
iii) Draw a dot (.) and cross (x) diagram to show how the dimmer in (ii) III above is formed.
(2mks)
3a. (i) Sulphur is allotropic. What does this mean? (1 mark)
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(ii) Give two differences between rhombic and monoclinic sulphur. (2 marks)
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(iii) State and explain using an equation the observations made when sulphur reacts with hot concentrated nitric (v) acid. (3 marks)
Observations
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Equation
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I. (i) Name the raw materials A and B. (2 marks)
A...................................................................................................................................
B...................................................................................................................................
(ii) Name the chambers X and Y. (2 marks)
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II. (i) Name two impurities that are removed during the purification stage. (2 marks)
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(ii) Why must the impurities in (i) above be removed. (1 mark)
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III. (i) Name the catalyst used in this process. (1 mark)
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(ii) The equation below shows what happens in the catalytic chamber
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State the two conditions that are necessary for maximum production of SO3 (2 mark)
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4.The diagram below shows the process of manufacturing sodium carbonate using ammonium soda process. Study it and answer the questions that follow.
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a) Name gases A and B. (2 marks)
A ________________________________________________________________________________
B ________________________________________________________________________________
b) Name solution C and D. (2 marks)
C ________________________________________________________________________________
D ________________________________________________________________________________
c) Write equations of the reactions in: (2 marks)
Tower P ___________________________________________________________________________________ Chamber R ___________________________________________________________________________________
d) Name the product T formed at chamber R and give one of its uses. (2 marks)
Name: ____________________________________________________________________________ Use: ____________________________________________________________________________
e) Name two uses of sodium carbonate produced in the process. (2 marks)
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5.The flowchart below shows the large scale manufacture of nitric (V) acid. Study it and answer the questions below.
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a) Name substance X. (1 mark)
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b) Identify one source of X in this process. (1 mark)
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c) Write a balanced equation for the reaction which takes place.
i) At step II. (1 mark)
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ii) In the absorption tower (1 mark)
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d) Name the catalyst used in this process (1 mark)
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e) Why is it not advisable to store nitric (V) acid in a transparent bottle? (1 mark)
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f) The apparatus below was arranged to investigate the properties of nitric (V) acid.
Study the set-up and answer the questions that follow:
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i) Explain what would be observed when blue and red litmus paper is dropped into flask Y after the experiment. (2 marks)
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ii) Write an equation for the reaction in test tube X above. (2 mark)
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iii) What gaseous products would be expected if concentrated sulphuric (VI) acid was used in place
of conc. nitric (V) acid? (2 mark)
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6.The set up below was used to prepare and collect gas X. During the experiment cleaned magnesium
ribbon was strongly heated before heating the wet glass wool.
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a) Name gas X. (1 mark)
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b) Why is magnesium ribbon cleaned before it is used? (1 mark)
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c) State one observation that would be noted in the reaction tube. (1 mark)
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d) Write the equation for the reaction in the reaction tube. (2 mark)
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e) State one industrial use of solid product formed in the reaction tube. (1 mark)
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f) What precaution should be taken at the end of the experiment? Explain. (2 marks)
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g) At the end of the experiment 96.0cm3 of gas X were collected at 10℃ and 1 Atmosphere pressure.
(Mg=24, MGV=22.4, T=O℃ at s.t.p, P=1 atmosphereat s.t.p)
i) Determine the volume gas X would occupy at s.t.p. (3 marks)
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ii) Calculate the mass of magnesium ribbon used (Mg=24). (2 marks)
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