What type of energy transformation is taking place when natural gas is used to heat water?
a. chemical energy to thermal energy
b. thermal energy into mechanical energy
c. mechanical energy into electromagnet energy
d. electromagnet energy into chemical energy

c (diamond),

sio2 (quartz)

water and alcohols have similar properties because water molecules contain hydroxyl groups that can form hydrogen bonds with other water molecules and with alcohol molecules, and likewise alcohol molecules can form hydrogen bonds with other alcohol molecules as well as with water.