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

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

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?

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

Q3. Of the following most common age-related physical care problems of older adults, which is one leads to numerous complications?

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

What are the percent by mass–volume of the solutes in the following solutions?    90 g of sodium chloride in 1.5 L of solution