3. Direct vs. indirect water uses
- a. Manufacture of the filter paper: indirect use of water because the trees that produced the paper had to be watered previously
- b. Premoistening of the sand and gravel: direct use of water because it is taken right from the sink and used to dampen the filter paper
- c. Use of water to cool the distillation apparatus: direct because you use water from the sink in order to change its forms
4. “Purifying” water means to revert any foul water to the most natural or clean form as possible.
5. Three techniques used to purify water are
oil-water separation, sand filtration, and charcoal adsorption and filtration.
6. Many different substances were removed from the
foul-water sample in each step of the investigation. In the oil-water
separation, oil was removed. In sand filtration, solid particles were removed.
In charcoal adsorption and filtration, other unsanitary particles were removed
from the water, leaving a substance that appeared to be fairly pure.
7. The procedure used in the foul water laboratory
investigation could not convert seawater to water suitable for drinking because
since salt particles are so small, they cannot dissolve right away when mixed
with water. Therefore, these processes would be much harder to undo for such a
tiny particle. In order to make seawater suitable for drinking, you would need
to evaporate the water out, leaving only salt, and then allow the steam to
condense, bringing back a purer form of water.
A.8 #1-4 on p. 22
1. Three water uses that you could do without are washing cars, floors, windows, and pets.
2. One activity that you could not do without is showering.
3. You could reduce the use of water by taking less time to shower, taking shorter baths, and using Purell to wash my hands.
4. Impure vs. pure water
- a. You could use impure water when washing your dog, flushing the toilets, washing the car, or watering the lawn.
- b. This water could be taken from washing your hands, dishes, and clothes.
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