Chemistry Questions and Answers - Form 1 Term 2 Opener Exams 2022

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QUESTIONS

  1.        
    1. What is chemistry? (1mk)
    2. State two roles of chemistry in our society? (2mks)
  2. Outline any five laboratory safety rules (5mks)
  3.         
    1. What is a flame? [1mk]
    2. The following diagram represents a non – luminous flame of a Bunsen burner.
      1
      1. State the colour of the parts of the flame labelled A,B and C (3mks)
      2. Which of the parts in (i) above is the hottest? (1mk)
      3. Why is non-luminous flame preferred for heating? (2mk)
      4. Name the other type of flame produced by the Bunsen burner. [1mk]
    3. Under what condition does the bunsen burner produce the flame you named in (a) above (1mk)
  4.        
    1. Explain why most laboratory apparatus are made of glass. (4mks)
    2. Identify the following laboratory apparatus (3mks)
      2
  5.           
    1. Define matter. (1mk)
    2. Give 3 states of matter. (3mks)
    3. Identify the physical process in the diagram below. (6mks)
      3
    4. State the differences between solid, liquid and gases (3mks)
  6. Identify the laboratory apparatus below and label the parts. [6mks]
    4
  7.        
    1. Define the following terms
      1. mixture (1mk)
      2. Compound (1mk)
      3. Element (1mk)
    2. Name 2
      1. Mixtures [2mks]
      2. Compounds [2mks]
      3. Elements [2mks]
    3. List three differences between temporary and permanent changes. (3mks)
    4. Give three examples of:
      1. Temporary physical change (3mks)
      2. Permanent change (3mks)
    5. what are the chemical symbols of the following elements:
      1. Copper
      2. Sodium
      3. Potassium
  8. Name the elements present in the following compounds. (6mks)
    1. Iron Sulphide
    2. Copper (ii) Sulphate
    3. Sodium Sulphite

MARKING SCHEME

  1.      
    1. What is chemistry? (1mk)
      It involves the study of composition and properties of matter
    2. State two roles of chemistry in our society? (2mks)
      • Helps in the manufacture of substance like soap, glass, plastics, medicine that are useful to the society.
      • Important in purification of some substance
  2. Outline any five laboratory safety rules (5mks)
    • Never run while in the laboratory
    • Never taste or eat anything in the lab
    • Consultation before trying any experiment
    • Label all the chemicals you are using
    • Always put off flames
  3.      
    1. What is a flame?
      It is a mass of burning gases
    2. The following diagram represents a non – luminous flame of a Bunsen burner.
      1. State the colour of the parts of the flame labelled A,B and C (3mks)
        • A- Pale blue region
        • B- Greenish blue region
        • C- Almost colourless region
      2. Which of the parts in (i) above is the hottest? (1mk)
        Pale blue region
      3. Why is non-luminous flame preferred for heating? (2mk)
        Hottest flame doesn’t produce soot
      4. Name the other type of flame produced by the Bunsen burner.
        Luminous
    3. Under what condition does the bunsen burner produce the flame you named in (a) above (1mk)
      When the air hole is closed
  4.        
    1. Explain why most laboratory apparatus are made of glass. (3mks)
      Does not react with most of substances
      Easy to clean
      For visibility
    2. Identify the following laboratory apparatus (3mks)
      • (i) Conical flask
      • (ii) Measuring cy
  5.      
    1. Define matter. (1mk)
      Anything that mass mass and occupy space
    2. Give 3 states of matter. (3mks)
      Solid, liquid and gases
    3. Identify the physical process in the diagram below. (6mks)
      1. Melting
      2. Evaporation
      3. Condensation
      4. Freezing
      5. Sublimation
      6. Deposition
    4. State the differences between solid, liquid and gases (3mks)
      Solid have a definite mass, shape and volume
      Liquid have a definite mass and volume
      Gases have only definite mass
  6. Identify the laboratory apparatus below and label the parts.
    1. Chimney
    2. Collar
    3. Air hole
    4. Jet
    5. Base
  7.      
    1. Define the following terms
      1. mixture (1mk)
        Consists of two or more substances combined physically and physical means can be used in separation.
      2. Compound (1mk)
        Is a pure substance made up of two or more elements chemically combined?
      3. Element (1mk)
        Is a pure substance which cannot be split into simpler substances by chemical means
    2. Name 2
      1. Mixtures
        Maize and beans, sand and salt
      2. Compounds
        CUSO4 and H2SO4
      3. Elements
        Mg and Sulphur
    3. List three differences between temporary and permanent changes. (3mks)
      Temporary changes Permanent changes
      No new substance formed
      Heat energy is not involved
      Reversible
      No change in mass
      New substance formed
      Heat energy is involved
      Irreversible
      Changes in mass
    4. Give three examples of:
      1. Temporary physical change (3mks)
        Heating ZnO
        Heating solid wax
        Heating solid lodine
      2. Permanent change (3mks)
        Combustion of fuel
        Combustion of firewood
        Heating of CU(No3)2
    5. what are the chemical symbols of the following elements:
      1. Copper
        Cu
      2. Sodium
        Na
      3. Potassium
        K
  8. Name the elements present in the following compounds. (6mks)
    1. Iron Sulphide
    2. Copper (ii) Sulphate
    3. Sodium Sulphite

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