Lab Safety Rules
Temperature Properties of Water
Density
Water structure and phases
Water scarcity, cleaning and reuse
100
What are you NOT supposed to sit on in the lab?
The lab counter
100
What is the melting point of water?
0 C
100
What is the formula for finding density?
mass divided by volume
100
What structure do water molecules form when solid?
Hexagon
100
Where does Douglas get their water?
North Platte River, after Casper has used it
200
What should you always wear while doing a lab?
Safety glasses
200
The Freezing point of water is _______ degrees Celsius
What is = 0 degrees C.
200
If 18 mL of water has a mass of 18.2 g, what is the density?
1.01 g/mL
200
What one substance do we see in all three phases on earth?
Water
200
Can water be purified to more pure than natural?
Yes - Orange County CA is purifying wastewater to cleaner than natural aquifers.
300
What is the 2nd warning for horseplay in the lab?
Sit out of lab and doing some boring worksheet
300
Does water always boil at 100 C?
No, elevation and air pressure affect boiling point.
300
How dense is freshwater?
1.00 g/mL
300
What happens to the distance between water molecules when they go from liquid to gas?
They move farther apart
300
What do ppm and ppb stand for?
Parts per million and parts per billion
400
What can we NOT have in the lab?
Food or Drink
400
What is the freezing point of water?
0 C
400
What is more dense, hot water or cold water?
Cold water
400
What is the process called when a substance (example: dry ice) goes from the solid phase straight to gas?
sublimation
400
What percent of earth is water?
71%
500
What safety measures do you need in order to be in the lab?
Safety glasses, no horseplay, use common sense, read and follow instructions
500
What is the boiling point of water?
100 C at sea level, 97 C in Casper
500
What would the molecules look like in each of the 3 phases of water? (Solid, liquid, gas)
What is Solid: tightly compacted together vibrating in place Liquid: Farther apart flowing together Gas: Far apart going very fast
500
Draw a diagram of water molecules in each of the three phases of matter.
Solid - hexagonal shape with more space between molecules than liquid Liquid - molecules close together Gas - molecules spaced far apart
500
Did people in Orange County, CA notice the difference in reused water?
No
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