1) An extra strength antacid tablet contains 750 mg of active ingredient, CaCO3. If it takes 22.25 mL of HCl(aq) to neutralize the tablet, how strong is the acid? 2 HCl (aq) + CaCO3 (aq) - CaCl2(aq) + HOH (1) + CO2 (g)

What reaction is taking place? 02 + c3h8 = h20 + co2

Name the element in group 17, period 2. (periodic table)

The bond energy for the van der waals bond between two helium atoms is 7.9×10−4ev. assuming that the average kinetic energy of a helium atom is (3/2)kbt, at what temperature is the average kinetic energy equal to the bond energy between two helium atoms