3.4: Writing Chemical Formulas

Chemical compound is formed when two or more ions are formed.

• True

• False

Choose the incorrect pairing below:

• Cation -> positive

• Anion -> negative

• Ionic bonding -> metal to metal

• Covalent bonding -> nonmetal to nonmetal

An atom must have how many valence electrons to become stable?

• 6

• 8

• 10

• 12

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which is positive ion?

• Cation

• Anion

Which is negative ion?

• Cation

• Anion

What is the first step in writing a chemical formula?

• Write the multipliers as subscript of each element.

• Identify the symbols and charges of the elements.

• Balance the charges by looking for multipliers.

What is the correct chemical formula of sodium oxide?

• Na2O

• NaO2

Tags

NGSS.HS-PS1-2

The formula of copper(II) oxide is

• CuO

• Cu₂O

• CuO₂

The formula of iron(III) oxide is

• FeO

• FeO₂

• Fe₂O

• Fe₂O₃

The formula of magnesium chloride is

• MgCl

• MgCl₂

• MgCl₃

Tags

NGSS.MS-PS1-1