Physical changes are those that because they do not change the of the substance they are usually

chemical changes are those that produce for that reason chemical changes are never

Just as chemists have classified elements and compounds, they ... Changes are either classified as physical or chemical changes. ... Physical changes involve moving molecules around, but not changing them.

Explanation:

If that's wrong then I don't know

while cooking a piece of 1/2 pound beef steak, a cast iron pan (2.4kg in weight) was heated 260 celsius.

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.