2Ca + O2 → 2CaO   How many grams of CaO are produced when 64 grams of oxygen reacts completely with calcium?

The representative elements are also known as the _______________ (A/B) group elements.   The transition metals are also known as the _______________ (A/B) group elements.   

The farther away an energy level is from the nucleus, the _________ the energy of an electron in that level. (lower or higher) 

Classify each of the following as an element, compound, or mixture

Whats is the maximum number of electrons permitted in each of the following energy levels;   2nd energy level, ___ 5th  energy level, ___

Which of the following element does not have one valance electron?

The equation N2 + 3H2 —– 2NH3 can be interpreted as follows: 1 mol of N2 reacts with 3 mol of H2 to form 2 mol of NH3. Is this statement true or false?

The empirical formula of a compound is CH2O, and its molar mass is 90 g. What’s the molecular formula?

Which one is the correct formula of carbon monoxide?

When the equation below is balanced, the coefficient of aluminum chloride is:  AlCl3 + H2SO4 → Al2(SO4)3 + HCl