A chemical 'system' refers to which of the following?* OA process for causing a chemical change.
O The beakers, tubes, flasks, etc. in which a chemical change occurs.
O The reactants and products in a chemical reaction.
O Everything other than the reactants and products.

i think it is true since you can test the answer and can use observations to complete it.

it means there are 3 atoms of oxygen

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.