3.) a vector is a measurement that has both size and direction and may be
represented by an arrow.
a. true
b. false

True

Explanation:

A vector quantity is a quantity that can be completely described by it's magnitude as well as direction

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.