Indicate whether the statement is true or false. An element’s molar mass is equivalent to the atomic number of the element.

• True

• False

Indicate whether the statement is true or false. In a neutral atom, the number of protons is equal to the number of neutrons.

• True

• False

Indicate whether the statement is true or false. In the notation 107/47 Ag, 107 represents the atomic number and 47 represents the atomic mass of silver.

• True

• False

Indicate whether the statement is true or false. Greek philosophers thought that matter was composed of four elements: air, earth, fire, and water.

• True

• False

Indicate whether the statement is true or false. Isotopes are forms of an element that have the same number of protons but a different number of electrons.

• True

• False

Find the formula for the compound that contains 72.40% iron and 27.60% oxygen.

• Fe3O4

• FeO2

• FeO

• Fe2O3

How many electrons are in a neutral atom of sodium?

• 11

• 22

• 12

• 23

How many neutrons are in an atom of chlorine?

• 35

• 18

• 34

• 17

How many moles are present in 21.2 g hydrochloric acid, HCl?

• 1.72 mol

• 0.582 mol

• 128 mol

• 21.0 mol

What is the molar mass of Ca(OH)2?

• 57.008 g/mol

• 73.089 g/mol

• 73.088 g/mol

• 74.092 g/mol