Which term is defined by the amount of a certain isotope that occurs in a natural sample of an element?
a) percent abundance
b) percent atomic weight
c) average atomic mass
d) ion abundance

Astudent carefully transfers 30 g of water and 30 g of alcohol in a glass tube, forming two layers and filling the tube completely. after sealing the tube, the student mixes the solutions, and notices a bubble that forms in the tube. what is the mass of the contents in the glass tube after mixing?

How many moles of carbon dioxide will form if 2.5 moles of c3h8 is burned

In the particles are arranged in a regular, repeating pattern. a)a crystalline liquid b)a crystalline solid c)all gases d)all solids