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)

Which formula below is paired incorrectly with its chemical name?

What type of matter is characterized by a uniform composition throughout, but with a varying composition between samples?

It’s common knowledge that it takes 3.8 x 1024 silver atoms to kill a werewolf. If a pure silver bullet has a mass of 0.3 kg, how many bullets would you need to kill the dreamy fellow below?

How many electrons (e-) are there in one ion of 203Tl2+?

Which of the compounds below is named incorrectly?