If an element has 2 naturally occurring isotopes, one with a Mass Number of 10 amu and one with a mass number of 20 amu, explain why the atomic mass of the isotope may not be 15 amu (the average of the 2 numbers).

Consider the following reactions. (note: (s) = solid, (l) = liquid, and (g) = gas.) mg(s) + ½o2(g) → mgo(s) + 146 kcal/mole h2(g) + ½o2(g) → h2o(g), δh = -57.82 kcal/mole what type of reaction is represented by the previous two examples?

Compare and contrast solutions and suspensions

Is powdered sports drink ionic or covalent ? 10pts !