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FORM 1 CHEMISTRY QUESTIONS

CHEMISTRY EXAM

END OF TERM EXAMS

FORM 1

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

  • Explain the difference between F and G

                                          2 marks

  • Name the type of flame that was used in the above experiment 1 mark
  • Give 4 differences between the above flame and the other flame produced by a Bunsen burner.  4 marks

3.         (a) When the air-hole is fully opened, the Bunsen burner produces a ……………………. … flame. 1 mark

(b) Draw a labeled diagram of a non-luminous flame      3 marks

4.         (a) What is a drug?      1 mark

            (b) Give two drugs that are commonly abused by the youth.   2 marks

6.         A mixture of oil and water was shaken and left to separate as shown in the diagram below:

State the identity of;                                                                                                              

            (i) P ………………………………..……..     (ii) W ………………………………….…. 2 marks

             Name the above apparatus     1 mark

7. The diagram below shows the heating curve of a pure substance. Study it and answer the

Text Box: Temperature  (oC)             questions that follow:

  • What changes are taking place at points X and Z?  2 marks 
  • Explain what happens at:-

A-B                                                           2 marks

B-C                                                           2 marks

  • Is the substance above pure or impure? Explain       2 marks
  • On the same graph draw a sketch that would have been obtained if an impure substance was used. 1 mark

8.         (a) State two differences between luminous flame and non-luminous flame     1 mark                                

            (b) It is advisable to set a Bunsen burner to luminous flame prior and after an experiment.

                  Explain                  1 mark

9. The apparatus below were used by a student to study the effect of heat on hydrated copper II sulphate

(a) What is the role of the ice cold water            ………………………………………………………………………………………            1 mark                                    

            (b) Name liquid P       …………………………………………………………        1 mark

            (c) What observation is made in the boiling tube                   2 marks

10) The diagram below show spots of a pure substance A, B, and C on a chromatography paper. Spot D is that of a mixture

              After development A, B, and C were found to have moved 8cm, 3cm and 6cm respectively.

            D had separated into two spots which had moved 6cm and 8cm

            On the diagram above;

              I. Label the baseline (origin) and solvent front     2marks                                                                                      

             II. Show the positions of all the spots after development     6 marks                                   

              ii) Identify the substances present in mixture D       2 marks

11. A student left some crushed fruit mixture with water for some days. He found the mixture had  fermented. He concluded that the mixture was contaminated with water and ethanol with boiling point of 100oC and 78oC respectively. The set-up of apparatus below are used to separate the mixture.

  • Name the piece of apparatus labelled W        1 mark

                                    …………………………………………………………….                          

  • What is the purpose of the thermometer in the set-up?  1 mark

……………………………………………………………………………………………..                                     

            iii) At which end of the apparatus W should tap water be connected? A or B      1 mark     ……………………………

            (iv) Which liquid was collected as the first distillate? Explain   2marks                                                       

            (v) What is the name given to the above method of separating mixture?      1 mark

            (vi) State two applications of the above method of separating mixtures       1 mark

            (vi) What properties of the mixture makes it possible for the component to be separated

                  by  the above methods?    2 marks

12. Give two reasons why a luminous flame is not used for heating purposes          2 marks

13. Given a mixture of lead (II) oxide (insoluble), ammonium chloride and sodium chloride(table salt), describe  how this mixture can  be separated to obtain a sample of each.     2 marks                       

14. Define the following terms:     8 marks

  1. Chemistry
  • Drug abuse
  • Matter
  • Laboratory
  • Saturated solution
  • Crystalisation
  • Atom
  • Element
  1. Molecule

15. Name any 5 laboratory rules      5 marks

16.  Name the elements present in the following    5 marks

  1. Sodium chloride
  • Magnesium sulphate
  • Carbon iv oxide
  • Ammonium hydroxide
  • Zinc carbonate

17.  Give the total number of atoms in the following      7 Marks

ZnCO3

NaOH

AlO3

Ca3(PO4)2

(NH4)3HPO4

18.  Complete the following word equations

Carbon + oxygen

zinc +oxygen