Murray Counting Atoms

When identifying elements in a chemical formula, what is the rule for capitalization?

• The first letter of every element symbol is always lowercase.

• If an element symbol has only one letter, it is capitalized; if it has two letters, both are capitalized.

• The first letter of an element symbol is capitalized, and any subsequent letters for that same element are lowercase.

• All letters in an element symbol are always capitalized.

How many Oxygen atoms are in this formula?

• 1

• 2

• 3

• 4

How many elements are present in this formula?

• 3

• 12

• 6

• 24

What does a subscript number in a chemical formula represent?

• The total number of atoms in the entire compound.

• The number of atoms of the element written immediately before the subscript.

• The number of molecules of the compound.

• The charge of the element.

How many total atoms are in the formula?

• 2

• 3

• 14

• 9

In a chemical formula, what is the effect of a coefficient placed in front of the entire formula?

• It only multiplies the first element in the formula.

• It indicates the number of different elements present.

• It multiplies the number of all atoms in the entire formula.

• It represents the atomic mass of the compound.

How many oxygen atoms are present in the chemical formula Al2(CO3)3?

• 3

• 6

• 9

• 12

How many different elements make up this formula?

• 14

• 4

• 1

• 8

How many Hydrogen atoms are present in this formula?

• 2

• 8

• 1

• 4

When they added a coefficient to the formula, how many total atoms are in it now?

• 16

• 15

• 30

• 4