What is the oxidation number (ON) of each element in the polyatomic anion, NO2- ?

What is the probability that a randomly selected exam will require between 14 and 19 minutes to grade?

What is the name of the compound, (NH4)2SO4?

It is exactly 2,449 miles from Justin Bieber’s current residence in California to his childhood home in Ontario, Canada. If Bieber is deported back to his home in Canada, approximately how many picometers (pm) will he have to travel?

What is the mass percentage of carbon in  C21H23NO5?

What is the mass percentage (% by mass) of carbon in dimethylsulfoxide (C2H6SO)?

Which group in the periodic table contains only nonmetals?

The element rubidium has two natural occurring isotopes: 87Rb (86.909 amu) and 85Rb (84.912 amu). Which of the statements below is true?

“White gold” contains gold and a “white” metal, such as palladium. Two samples of white gold differ in the relative amounts of gold and palladium they contain, although both are uniform in composition throughout.  Which of the choices below is the best classification of “white gold”?

The combustion of ammonia in the presence of oxygen produces NO2 and H2O:                         4 NH3 (g) + 7 O2 (g)