Water Review

What is the chemical formula for water?

• HO
• H3O
• H2O
• HHO

Which side of a water molecule is more negative?

• oxygen
• hydrogen

What percentage of the earth is covered by water?

• 50%
• 60%
• 75%
• 85%

What percentage of our body is made of water?

• 20-30
• 30-40
• 50-60
• 60-70

Water boils at

• 10 degrees celsius
• 30 degrees celsius
• 50 degrees celsius
• 100 degrees celsius

Water freezes at

• -10 degrees celsius
• 0 degrees celsius
• 32 degrees celsius
• 100 degrees celsius

The hydrogen and oxygen within one water molecule are held together by a(n)

• ionic bond
• covalent bond
• hydrogen bond
• attraction bond

The hydrogen and oxygen of two different water molecules are held together by attractive forces called

• hydrogen bonds
• covalent bonds
• ionic bonds
• attraction bonds

Water is ____ when it freezes.

• more dense
• less dense
• closer together
• heavier

At what temperature is water most dense?

• 1 degree celsius
• 2 degrees celsius
• 4 degrees celsius
• 0 degrees celsius