Suppose that a different student obtained reaction
rates for the particle-size experiment, and that
these rates did not show a pattern. Check all
possible sources of this error.
Some of the broken tablet was not added to
the water.
The tablet was not crushed enough to make
a substantial difference
The size of the reaction beaker was varied.
The tablets were not uniform in their mass.

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.