Chemistry Trial Exams Paper 1 Questions - Alliance Boys High School Mock December 2020

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Instructions to Candidates

  1. Write your name, Admission number and index number in the spaces provided
  2. Sign and write the date of examination in the spaces provided above
  3. Answer ALL the questions in the spaces provided below each question.
  4. Mathematical tables and silent electronic calculators may be used.
  5. All working MUST be clearly shown where necessary.
  6. This paper consists of 13 printed pages

For Examiner's Only

Questions  Max. Score  Candidate's Score 
 1 - 32  80  


QUESTIONS

  1.                        
    1. Distinguish between efflorescent and hygroscopic substance (2mrks)
    2. Give one use of hygroscopic substance in the laboratory (1mrk)
  2.                              
    1. Define the following terms:
      1. Atomic number? (1mrk)
      2. Element (1mrk)
    2. An Element P forms an Oxide PO2 and element belongs to period 3. Draw the structure of the compound when P reacts with Chlorine. (Imrk)
  3. Elements combine chemically to form different compounds or decomposed to form different compounds as shown below.  
    Number  Name of compound  Names of Radical   Name of Gas produced
     I  Sodium Nitrate    
     II  Sodium Hydrogen carbonate     
    1. Complete the table below by filling the Name of the radical formed and gas produced after decomposition of the compounds. (2mrks)
    2. State One industrial use of the gas produced in part 1 (1mrk)
  4. Zinc Oxide is an Amphoteric Oxide and it reacts with both acids and bases,
    1. Write equation for the reaction between Zinc Oxide and Hydrochloric acid. (1mrk)
    2. Calculate the number of moles of hydrochloric acid that would react completely with 5.063g of Zinc Oxide. (Zn=65, 0=16) (2mrks)
  5. During a separation process, a substance that remains on the filter paper is called residue while the liquid that goes through the filter paper and is collected in the beaker is called filtrate.
    1. Name the Process describe above (1mrk)
    2. A mixture contains copper powder and Zinc powder, describe how you would obtain copper from the mixture using dilute sulphuric (VI) Acid. (2mrks)
  6.                                  
    1. A glass beaker fell from a bench onto the concrete floor breaking into many small pieces, is this chemical or physical Explain. (1mrk)
    2. A homogenous mixture containing liquid X, Y and Z with boiling points of 82°C, 138°C and 115°C respectively is to be separated.
      1. Name the method of separation (1mrk)
      2. Give one industrial application of the above method. (1mrk)
  7.                              
    1. Differentiate between Empirical and Molecular formula. (1mrk)
    2. If the mass of water of crystallizations in magnesium sulphate, MgSO4.nH20 is 51.2%, Determine the value of n (Mg=24, S=32, O=16 H=1) (2mrks)
  8.                        
    1. Name the second member of Alkene homologous series (1mrk)
    2. Distinguish between butanoic acid and butanol (2mrks)
  9. Explain how increase in concentration affects rates of reaction. (2mrks)
  10. Volume of a gas was reduced to half its original volume at constant temperature when pressure on it was doubled.
    q10 uiaygs
    1. Which gas law was demonstrated by the set-up (1mrk)
    2. Pressure inside the container B increases Explain (1mrk)
    3. Explain what happens to kinetic energy of the particles as the volume is reduced. (1mrk)
  11. One of the graphs below shows the rate of collecting oxygen gas from a gas tank and the other from reaction vessels.
    q11 jagsutha
    Explain which Graph was connected to:
    1. Gas tank (1 mrk)
    2. Reaction Vessel. (1 mrk)
  12. White solid J was tested as described below.
    1. little sodium hydroxide was added to sample and heated a gas evolved which turned Red-litmus paper blue.
    2. Second sample was dissolved in water, few drops of lead (II) Nitrate solution were then added and warmed white precipitate which dissolved on warming. 
      1. Name the solid J. (1mrk)
      2. Write ionic Equation for the formation of white precipitate. (1mrk)
  13. The diagram below shows how to prepare hydrogen gas in the laboratory
    q13 kjhags
    1. I). Identify Liquid X (1mrk)
      II). State the function of Solid Y (1 mrk)
    2. The gas formed above was passed over heated Iron (III) Oxide. Write the equation for the reaction. (1mrk)
  14. A sample of water was suspected to contain Calcium ions. Describe chemical test to confirm the presence of the Calcium ions in water. (2mrks)
  15.                                  
    1. What is meant by lattice energy? (1mrk)
    2. Study the Energy level diagram below and answer the questions that follow.
      q15 ytfa
      1. What type of reaction is represented by the diagram? (1mrk)
      2. Given that Enthalpy of Hydration of Calcium chloride is =-1730kJ. Calculate the enthalpy of Lattice of Calcium chloride (2mrks)
  16. State and explain the observation made when Chlorine gas is bubbled into Potassium lodide solution. (2mrks)
  17.                                
    1. Name One Anion present in Temporary hard water. (1mrk)
    2. Explain how ion exchange softens hard water. (2mrks)
  18. Study the standard electrode potentials in the table below and answer the questions that follow, the letters are not actual symbol of the elements.
    A2+ (aq) + 2e- → A(s) +0.34v
    B2+ (aq)+ 2e- → B(s)   -2.38
    C+ (aq) + e- → C(s)     +0.80v
    1. Identify the strongest Reducing agent (1mrk)
    2. Calculate the electromotive force when the half-cell of A and C are combined (2mrks)
  19. Tetra chloromethane and water are immiscible and water is less dense, iodine is dissolved in water and brown solution is formed.the solution formed and tetra chloromethane are mixed in a separating funnel as shown below.
    q19 ihgas
    1.  Name the method of separation shown above. (1mrk)
    2. Explain how iodine can be obtained from the mixture in (ill) above (2mrks)
  20. The property of ammonia gas was investigated using the set up shown in the diagram below.
    q20 khags
    1. What name is used to describe the experiment. (1mrk)
    2. Name the property of ammonia gas demonstrated by the experiment. (1mrk)
    3. identify another gas that may be used instead of ammonia gas. (1mrk)
  21. Moist chlorine gas is inverted over moist hydrogen sulphide gas as shown below.
    q21 jags
    1. State and explain the observation made during the reaction. (2mrks)
    2. Write equation for the reaction. (1mrk)
  22.                                      
    1. Powdered sulphur was placed in methylbenzene and the mixture stirred and filtered and filtrate evaporated slowly and crystal formed.
      1. Name the allotrope of sulphur formed (1mrk)
      2. Draw the shape of the crystal formed above. (1mrk)
    2. State the function of superheated water in Frasch process. (Imrk)
  23. Chlorine reacts with water to form a solution shown in the equation below
    Cl(g) + H2O(l) → Cl(aq) + HOCL(aq)
    1. Explain why chlorine is added to water on a large scale. (1mrk)
    2. Green universal indicator is added to the solution above what colour change would be observed immediately (1mrk)
  24. What name is given to the following?
    1. Minimum energy required for a chemical reaction to start. (1mrk)
    2. A substance that increases the rate of a chemical reaction but remains unchanged at the end of the reaction. (1mrk)
    3. Coating of metal with another metal by use of electricity. (1mrk)
  25.                            
    1. Name the raw material from which sodium is extracted. (1mrk)
    2. Explain why sodium is extracted using electrolysis (1mrk)
    3. Name the compound that is used in the extraction gold (1mrk)
  26.                                  
    1. Define half-life. (1mrk)
    2. X grams of a radioactive isotopes takes 120days to decay to 3.5g and the half-life of the isotope is 20 days. Calculate the value of X. (2mrks)
  27.  Nitrogen and hydrogen react to form ammonia gas according to the equation below.
    N2(g) + 3H2(W) → 2NH3(g)
    The figure below shows how the percentage of ammonia in a reaction mixture changes when the reaction is carried out at three different temperatures A, B and C, Pressure is increasing steadily
    q27 jags
    Explain which reaction was carried out at a higher temperature (2mrks)
  28. Name the intermolecular forces present in the following. 
    1. lodine (1mrk)
    2. Water (1mrk)
  29.                                
    1. Name the family to which sodium metal belongs to. (1mrk)
    2. Give the name of the other metal in the same family and is just above sodium.(1 mrk)
    3. Give the name of the Noble gas which is used in street and advertisement light. (1mrk)

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