Polar molecules have

an unequal number of positive and negative particles

atoms that are the same element

an equal number of positive and negative particles

ionic bonds

A5 mole sample of liquid acetone is converted to a gas at 75.0°c. if 628 j are required to raise the temperature of the liquid to the boiling point, 15.600 kj are required to evaporate the liquid, and 712 j are required to raise the final temperature to 75.0°c, what is the total energy required for the conversion?

Which radioisotope is used to date fossils? a. oxygen-16 b. carbon-14 c. uranium-238 d. carbon-12

Can anyone answer these questions? ? i need it before 1: 00pm today