Heating Curve for Water 100°C
E
т
(KE)
0°C
B.
А
time
Answer the following questions based on the heating curve above.
1. What is the melting point of the substance?
"С
2. What is the boiling point of the substance?
С
3. What is the freezing point of the substance?
"С

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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.