Ahelium balloon contains 0.48 g of helium. given the molecular weight of helium is 4.0g/mol, how many moles of helium does it contain?

What are the 4 phases of matter in order of increasing engery content?

If you need to add 27.50ml of a solution, which piece of glassware would you use to deliver this volume and explain how you would determine if the 27.50 ml was measured?

Kelly has come up with an explanation for why her sister is sometimes in a good mood and other times in a bad mood. she speculates that it is based on the hours of sleep her sister got the previous night. this explanation for her sister's behaviors is an example of a(n)