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CHEMISTRY FORM 3 END TERM EXAMS PLUS ANSWERS IN PDF

ULTIMATE ACHIEVERS ACADEMY

Name___________________________________________________AdmNo:_____________

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END OF TERM  EXAMINATION 

FORM THREE

CHEMISTRY

2 HOURS

Instructions to candidates:

  1. Answer all questions in both section A and B.
  2. All working must be clearly shown and, in the spaces provided.

FOR EXAMINER’S USE ONLY

Section Maximum

Score

Candidate’s

Score

A 40  
B 40  
Grand Score 80  

 

SECTION A                                                                                                               40MARKS

  1. Distinguish between an element and a compound. (2 Mks)

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  1. A compound has an empirical formula of C2H5 Given it has a R.M.M. of 90, determine its molecular formulae. (C=12, H=1, O=16)                                                 (2 Mks)

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  1. Identify the particles responsible for electrical conductivity in each of the following. (3 Mks)
  2. Molten sodium chloride

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  1. Zinc metal

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  1. Graphite

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  1. The diagram below shows a set up used to investigate one of the conditions necessary for rusting.

 

 

 

 

 

 

 

  1. Identify the conditions being investigated in the experiment. (1 Mk)

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  1. State whether rusting occurred or Not. (1 Mk)

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  1. Explain why rusting occurs faster near factories that emit gases such as CO2, NO2 and SO2 into the atmosphere.                                                       (2 Mks)

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  1. Explain why a reaction occurs between copper (ii) oxide and magnesium powder, but no reaction occurs between magnesium oxide and copper powder.                                           (2 Mks)

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  1. The set-up below shows one of the methods used to separate a mixture of liquids P and Q

 

 

 

 

 

 

 

 

  1. State two properties of the liquids P and Q that make it possible to separate using the above method.                                     (2 Mks)

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  1. Name any other two methods that can be used to separate the mixture of liquids p and Q.

(2 mks)

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  1. The diagram below shows arrangement of particles in the three state of matter in no particular order.

 

 

 

 

 

 

 

  1. Which of the diagrams I, II and III represents;
  2. Matter in the solid state. (1 Mks)

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  1. Matter in the gaseous state. (1 Mk)

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  • State in which matter has the highest kinetic energy. (1 Mk)

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  1. The ratio of the rates if diffusion of gas X and gas y is 3:8. Given that 200 cm3of gas X diffuse through a porous plug in 75 seconds. How long would it take 160 cm3 of gas Y to diffuse under the same conditions?                                           (3 Mks)

 

 

 

 

 

  1. Describe how you can prepare a dry sample of barium sulphate starting with Barium nitrate crystals. (3 Mks)

……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

  1. Sodium carbonate can be obtained on large scale by manufacturing through the Solvay process.
  2. Name two raw materials for this process. (2 Mks)

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  1. Identify any other method that can be used to obtain sodium carbonate on large scale.

(1 Mk)

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  • State one use of sodium carbonate. (1 Mk)

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  1. Molten lead (ii) bromide was electrolyzed using carbon electrodes.
  2. Name any other substance that can suitably be used as electrodes in place of carbon. (1 Mk)

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  1. Name the product formed at the cathode. (1 Mk)

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  1. Write the ionic equation of the reaction that occurred at the cathode. (1 Mk)

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  1. The diagram below shows parts of a set-up to prepare and collect dry hydrogen gas.

 

 

 

 

  1. Identify reagent N and drying agent K. (2 Mks)

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  1. Complete the diagram to show how the dry hydrogen gas is collected.                                     (2 Mks)

 

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  1. Using universal indicator, describe how you can determine the PH value of a given solution.

(2 Mks)

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  1. State one advantage of universal indicator over other commercial indicators. (1 Mk)

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SECTION B

  1. The grid below shows a section of the periodic table, the letters are not the actual chemical symbols.

 

 

  1. Name the family into which element Q belongs to (1 Mk)

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  1. Element E can be placed in group I or group VII. Explain why (2 Mks)

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  1. What Name is given to the elements found in the shaded region W. (1 Mk)

 

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  1. Which letter represents element with the highest melting point in group II. Give reasons

(2 Mks)

……………………………………………………………………………………………………………………………………………………………………………………………………………………

  1. Write the chemical formulae of the;
  2. Sulphate of L (1 Mk)

…………………………………………………………………………………………………………

  1. Nitrate of R (1 Mk)

…………………………………………………………………………………………………………

  1. How does the following compare? Explain your answer
  2. Reactivity of J and N. (2 Mks)

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  1. Boilling point of the oxides of M and T.                         (2 Mks)

……………………………………………………………………………………………………………………………………………………………………………………………………………………

  1. In an experiment, 80 cm3 of 0.75 M hydrochloride acid were reacted with excess zinc carbonate to form solution W, Liquid R and gas T.
  2. Identify solution W and gas T. (2 Mks)

……………………………………………………………………………………………………………………………………………………………………………………………………………………

  1. Write a chemical equation of the reaction that occurred. (1 Mk)

…………………………………………………………………………………………………………

  1. Calculate the;
  2. Number of moles of hydrochloric acid that reacted with the zinc carbonate. ( 2 Mks)

 

 

  1. Number of moles of the Zinc carbonate that reacted with the acid (2 Mks)

 

 

  • Mass of the Zinc carbonate that reacted with the acid. (Zn = 65, C= 12, O= 16)

(2 Mks)

 

 

 

  1. Volume of gas T evolved at r.t.p. (1 Mole of gas at r.t.p. = 24 litres) (2 Mks)

 

 

  1. (a). Name the following hydrocarbons                                           (3Mks)
  2. CH3CH2CH2CH2CH3 ______________________________________

 

 

  1. CH3CHCHCHCH2 ________________________________________

 

Br        CH3                               Br

  • H –   C    –    C    –    C    =    C   –    C   –   H

 

 

H               CH3                       H

 

  1. The diagram below shows some reactions involving hydrocarbons.

 

 

 

 

 

 

  1. Identify the following (5 Mks)

I – substance L

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II – Substance M

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III – Substance Q

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IV – Process P

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V – Process N

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  1. Name two substances that can be used as catalysts during process W. (2 Mks)

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  1. Nitrogen (iv) oxide is one of the oxides of nitrogen.
  2. Name the other two oxides of nitrogen (2 Mks)

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  1. Which of the oxides you have named in a(i) above relights a glowing splint. (1 Mk)

 

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  1. Ammonia is a compound of nitrogen that can be obtained industrially by the Haber process;
  2. Other than nitrogen, name the other raw material for this process. (1 Mk)

…………………………………………………………………………………………………………

  1. Write a chemical equation of the reaction that occurs in the catalytic chamber to produce Ammonia. (1 Mk)

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  • State one use of ammonia (1 Mk)

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  1. When burning magnesium is lowered into a gas jar containing air magnesium oxide is one of the products formed. Name the other product that can possibly be formed. (1 mk)

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