List 10 examples of substances that are beneficial in small quantities but poisonous in large doses

Following Ten compounds are benificial in small quantity but poisonous at higher concentration.

                         1) Iron

                         2) Oxygen

                         3) Vitamin A

                         4) Vitamin D

                         5) Table Salt

                         6) Ethanol 

                         7) Amygdalin (found in apple)

                         8) Solanin (found in potato)

                         9) Formaldehyde (found in pears)

                         10) Cucurbitacin E (found in Cucumber)

Ithink this is what you meant. the temperature at which a liquid begins to boil is called the boiling point. the boiling point of water is 212°f or 100°c.  and at that point will start to turn into steam (gas)