Introduction to Chemistry Questions and Answers - Chemistry Form 1 Topical Revision

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Questions

  1. Wooden splints F and G were placed in different zones of a Bunsen burner flame.
    The diagram below gives the observations that were made
    burnt wooden splints
    1. Explain the difference between F and G
    2. Name the type of flame that was used in the above experiment
  2. The diagrams below represent a list of apparatus which are commonly used in a chemistry laboratory:-
    lab apparatus
    1. Give the correct order of the apparatus, using the letters only, to show the correct arrangement that can be used to prepare and investigate the nature of PH of a sample of onion solution
    2. Name one chemical substance and apparatus that is needed in this experiment
  3.  
    1. When the air-hole is fully opened, the bunsen burner produces a non-luminous flame. Explain
    2. Draw a labelled diagram of a non-luminous flame
    1. What is a drug?
    2. Give two drugs that are commonly abused by the youth.
  4. The diagram below shows three methods for collecting gases in the laboratory
    downward delivery
    1. Name the methods A and B
    2. From the methods above, identify one that is suitable for collecting sulphur (IV) oxide. Explain
  5. A mixture of hexane and water was shaken and left to separate as shown in the diagram below:
    mixturesseparation
    State the identity of;
    (i) P ………………………………..…….. (ii) W ………………………………….….
  6. The diagrams below are some common laboratory apparatus. Name each apparatus and state its use
    Diagram  Name Use
     mortar (½mk )  (½mk)
     crucible (½mk) (½mk)
  7. The diagram below shows some parts of a Bunsen burner
    Bunsen Burner
    Explain how the parts labelled T and U are suited to their functions
  8. The diagram below shows the appearance of two pieces of paper placed in different parts of a non-luminous flame of a Bunsen burner and removed quickly before they caught fire.
    burnt pieces of paper
    1. What do the experiments show about the outer region of the flame?
    2. From the above experiment, which part of the flame is better to use for heating?Give a reason
  9. A crystal of copper (II) sulphate was placed in a beaker of water. The beaker was left standing for two days without shaking. State and explain the observations that were made.
  10. Study the information in the table below and answer questions that follow. (Letters given are not real symbols)
    Ions  Electron arrangement  Ionic radius (nm)
    A+
    B+
    C2+
    2.8
    2.8.8
    2.8
    0.95
    0.133
    0.065
    Explain why the ionic radius of :-
    1. B+ is greater than that of A+
    2. C2+ is smaller than the of A+

Answers

    1. F is place in the middle of the flame while G is placed at the upper region of the flame
    2. Non - luminous flame
  1.  
    apparatus order of use
    1. The laboratory gas burns in excess oxygen
      OR burns completely or produces CO2and H2O only
      - No unburnt carbon remains
      OR No soot is formed/Produced.

    2. Non luminous flame
    1. a substance which when taken alters the body chemistry
    2. - alcohol
      - Tobacco
    1. A- Downward delivery /upward displacement of air
      B – Over water
    2. A – Denser than air
    1. P – Haxane
    2. W – Water
  2. Name – Mortar. √½
    Use – Holding solid substances being crushed. √½

    Name – Crucible
    √½
    Use – Holding solid elements being heated strongly. √½
  3. T – has a very small hole which releases the gas in small quantities/in form of a jet.
    U – It is heavy for stability
    1. It is very hot. (1 mk) √1
    2. The upper√1 part. Because all the gases undergo complete √1 combustion. √1 (2 mk) 3
  4. The crystal dissolved√ ½ . Blue colour spreads in water √ ½ . The crystal broke up into smaller particles of copper (II) sulphate and diffused in all direction
    1. W has more energy levels than S. √1
    2. C has got (12) protons pulling the 10 electrons while A has 11 protons
      2 pulling 10 electrons. √1

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