Which of the following correctly represents the compound formed from the ions Sr2+ and Se2-?
The starting substances in a chemical reaction are called the _____?
In chemistry class, what do we mean when we refer to a mole?
a. a fuzzy little creature
b. a dozen
c. 6.02 x 10²³
The periodic table tells you how many grams are in a mole of atoms of any element. This is known as the
b. molar mass
c. atomic mass unit
What is the molar mass of aluminum chloride?
a. 62.5 g/mol
b. 133.5 g/mol
c. 116.5 g/mol
How many moles of atoms are in 12.0 grams of helium?
How many molecules of water are in 4.8 moles of water?
a. 7.97 x 10-24
b. 2.89 x 1024
c. 5.20 x 1025
d. 1.61 x 1023
(Answers: 1.A 2.C. 3.C. 4.B. 5.B. 6.B. 7.C.)