Ch 2.2 : Properties of Water

Question 1

Properties of Water

Answer 1

Water molecules are slightly polar because hydrogen and oxygen atoms within it form polar covalent bonds

• Substances that readily form bonds with water (dissolves) are hydrophilic (“water-loving”)
• Substances that repel water are hydrophobic (“water-fearing”)

Question 2

Hydrophilic

Answer 2

Substances that readily form bonds with water (dissolves) are hydrophilic (“water-loving”)

Question 3

Hydrophobic

Answer 3

Substances that repel water are hydrophobic (“water-fearing”)

Question 4

Water as a Heat Sink

• Lots of energy
• Evaporate
• Cooled , insulation

Answer 4

It takes a lot of energy to break the bonds within a water molecule

• Water doesn’t evaporate until it reaches a high temperature
• When cooled, ice floats and it provides insulation for the water underneath

Question 5

The Universal Solvent

• Hydrogen b –> Absorb & release HE
• Polarity –> attracted to
• Passes through –> move

Answer 5

The hydrogen bonds in water allow it to absorb and release heat energy more slowly than other substances

• Water’s polarity means it is attracted to many different types of molecules
• When water passes through locations (air, ground, plant/animal etcs) it can move particles, such as chemicals and minerals

Question 6

Surface Tension

Answer 6

Means that there is greater attraction of water molecules to each other than to air molecules