CHEMISTRY - ASSORTED QUESTIONS

Calculate the relative atomic mass of an element whose isotopic masses and relative abundances are given below.                                                                                                                                       (3 marks)

 

              Relative Abundance              Isotopic Mass

              31                                                         65

              69                                                         63

2.       The pH values of solutions A, B, C, D are given below

          A – 9.8

          B - 2.0

          C - 5.2

          D - 12.0

          State the possible solution that corresponds to

          (i)      Hydrochloric acid

          (ii)     Ethanoic acid

          (iii)    Sodium Hydroxide         

CHEMISRY TEASER - 2016

i) State two conditions necessary for the interference of light to occur                                                 ( 2 mks )

ii) A monochromatic light of wavelength 5.6 x 10^-7 Passes through a double slit and forms 8 fringes of width 

     0.32cm. If the screen is 0.7m away from the slit, find the separation of the slits                               ( 3 mks )

      iii) What is monochromatic light                                                                                       ( 1 mk )

b)   A string vibrates at 25Hz. The speed of the wave on the string is 20ms^-1. Calculate the distance between two

      successive crests     ( 2 mks )