If an atom has a mass of 15 and an atomic number of 9. How many neutrons are in the atoms?

What is the ph of a solution of 1.0 * 10-9 m naoh (include 1 digit after the decimal in your answer) ?

What is a classified as an inner transition element? - calcium -copper -fermium -helium

A. it is physical change

If 2083 joules are used to melt 5.26 grams of aluminum, what is the heat of fusion of aluminum?

Consider the following reaction. 2Fe2O3 - - > 4Fe + 3O2 deltaH = + 824.2KJ The formation of 42.0 g of O2 results in? 1) the absorption of 361 kJ of heat. 2) the absorption of 11500 kJ of heat. 3) the absorption of 1080 kJ of heat.

How to write complete ionic and net ionic equations?

chromium can combine with chlorine to from corneum chloride which equation is a correct representation of this reaction

What is the atomic weight of a hypothetical element consisting of two isotopes, one with mass = 64.23 amu (26.0%), and one with mass = 65.32 amu? (a) 65.3 amu (b) 64.4 amu (c) 64.9 amu (d) 65.0 amu (e) 64.8 amu

Is this base a physical or chemical property?

Classify each of the following aqueous solutions as a nonelectrolyte, weak electrolyte, or strong electrolyte. a) LiClO4 b) HClO c) CH3CH2CH2OH d) HClO3 e) CuSO4 f) C12H22O11