chemical formulas and naming

A common ion that copper forms is:

• Cu⁺¹

• Cu⁻¹

• Cu³⁺

• Cu⁴⁺

Iron(II) oxide is shown in which of the following formulas?

• Fe₂O

• FeO

• FeO₂

• Fe₂O₂

The subscripts in a chemical formula of a compound let us know:

• just the total number of electrons present in a compound

• how many of each atom is present in the compound

• what elements are present in the compound

• the number of neutrons in the compound

The charge on the selenium ion when it combines with calcium to form CaSe is:

• 2⁻

• 1⁻

• 0

• 1⁺

• 2⁺

Chlorate is a polyatomic ion. Which of the following best describes chlorate?

• when it forms an ion it has a charge of 2⁺

• it has 3 atoms of chlorine

• it has three atoms of oxygen

• it has a combining capacity of +1

Which of the following best describes the compound LiClO₃?

• lithium chloride

• lithium chlorine trioxide

• 1 lithium, 3 chlorate

• 1 lithium, 1 chlorine, 3 oxygen

What is the total number of atoms in a molecule of the compound NaOH?

• 1

• 2

• 3

• 4

• 5

What is the total number of atoms in a molecule of the compound H₂CO₃?

• 3

• 5

• 6

• 7

• 0

How many total atoms are in a molecule of the compound (NH₄)₃PO₄?

• 4

• 10

• 13

• 15

• 20

How many atoms of oxygen are in the compound Cu(NO₃)₂?

• 1

• 3

• 5

• 6

• 2