Chemistry Unit 1A Review Sources and Uses of Water

Cleaning Water n Filters –remove solid materials n Charcoal –removes odor n Distillation –removes salts/ions/charged particles

Tyndall Effect n Positive = see the light = particles in the path of the light n Negative = don’t see the light = no particles present

Conductivity Test n Positive = conducts electricity =light bulb will lights up = charged particles/ions/salts are present Negative = light bulb doesn’t light up = no charged particles/ions/salts

Hydrologic Cycle n Groundwater = storage = aquifer n Percolation pond = replenishes groundwater Evaporation Gas state Condensation Liquid state

Water Sources n San Jose –ground water (.62%) n Other –Glaciers % –Lakes -.009% –Atomosphere -.001% –Rivers %

Water Use n Main uses of water –irrigation (in the west) –heating/cooling (all others)

Personal Use watering (1130 L/hour) *** washing ( L/time) showers/toilets (19L/min or flush) **** drinking, cooking (varies) about 300 L per day per person

Direct vs Indirect Uses of Water n Direct = used “last” –boiled egg = water boiled in –soup = water in soup n Indirect = used before, not always by person –boiled egg = water for chicken, grain, truck, carton –soup = water for can, chicken, grain, processing, label