In a science class, Ms. Fuller places a drop of rubbing alcohol on the back of her hand. She notices that her hand feels cold as the alcohol drop evaporates. Why does Ms. Fuller's hand feel cold?

If you add 10ml of hot water to 10ml of cold water and the change in tempature 8°c calculate how much energy is gained by the cold water

Which step in naming unsaturated hydrocarbons is used for alkenes but not alkynes

Tin has ten stable isotopes. the heaviest, 124sn, makes up 5.80% of naturally occuring tin atoms. how many atoms of 124sn are present in 82.0 g of naturally occurring tin? what is the total mass of the 124sn atoms in this sample?