13Thermal PollutionThermal pollution can occur when heated water is discharged into cooler streams or rivers. This heated water can increase biological activities and result in the reduction in oxygen content of the water.
14Unsaturated Solutions Contains less than the maximum amount of solute.No undissolved solute present.Can dissolve more solute.Dissolved solute
15Saturated SolutionsContains the maximum amount of solute that can dissolve.Tend to have undissolved solute at the bottom of the container.Solution is in equilibrium with undissolved solute.
16What is the solubility of NaCl at room temperature (25°C)? Solubility ≈ 36g NaCl/100g of water
17How could I dissolve the extra 4.0g of NaCl without adding more water?
18Heat up the water to ≈ 90°C Solubility ≈ 40g NaCl/100g of water If we would cool the water back to room temperature we may create a supersaturated solution.
19SupersaturatedA supersaturated solution contains more than the maximum amount of solute and is unstable. It returns to a saturated solution if disturbed in some way (i.e.: a seed crystal)
20Pressure and Gas Solubility More gas can dissolve at higher pressure.
22Nitrogen NarcosisThis is a condition that can result from diving too deep, bringing on disorientation, euphoria, errors in judgment and even hallucinations or unconsciousness. Any of those can be fatal.
24The BendsA sometimes fatal condition resulting from the formation of nitrogen bubbles in the blood and tissues, because of too rapid ascent, seen especially in deep-sea divers ascending rapidly from a dive.
25August 21, 1986Lake Nyos – Cameroon,Africa1800 people, thousands of cattle, and many more birds and animals are found dead.