Warm up

• Convert the following:• 24.3 ml to kl• 23Mg to cg

Water the Magic Molecule of Life

The Polarity of Water Molecules• The Unequal sharing of Electrons in a covalent

molecule results in a polar molecule

Cohesion• This is the attraction of molecules of water to each

other due to hydrogen bonding– In plants it helps them pull the water molecules up

against gravity

Adhesion and Surface Tension

Water Has a High Specific Heat

• Specific heat- The amount of heat it takes to change the temperature of 1 g of a substance 1°C– Calorie- the amount of heat necessary to raise 1g

of water 1°C– Hydrogen bonding dampens the effect of heating

thus causing the high specific heat

Evaporative Cooling

Ice vs Water

Ice is less dense thus it is floating an insulating the water below

Solvent of Life• Aqueous solutions have water as the solvent– Hydration shell is the hydrogen side surrounding anions

and oxygen side surrounding cations in solution– Non-ionic compounds can also dissolve if they have

polar regions or ionic bonds on their surface

Acidic and Basic Solutions