What is a thing that makes atoms of one element different from atoms of another element

Why are pipes bursting in the in extremely cold weather?

Which of the following represents the ester functional group? a. -coo- b. -cho c. -cooh d. c=o

If there are 3.5 moles of koh, how many moles of naoh can be produced? question 1 options: a)3.0 moles naoh b)3.5 moles naoh c)1 moles naoh d)9 moles naoh