1
The 2nd step of water treatment is ______________
Flocculation
An example of a flocculant used in water treatment is
Alum
What is the first step of water treatment
Coagulation
Water in gaseous form is called
Water vapour
The variable that is kept the same is called the
Control variable
Dew is formed when water vapour (gas) turns back into water. This process is called_______________
condensation
The temperature at which dew is formed is called
dew point
To make water safe for drinking you must
Boil it
Plants need water to carry out this process
Photosynthesis
true/false
Changes in the independent variable will cause changes in the dependent variable
True
What is the main purpose of water treatment
To remove waste and harmful substances
The process in water treatment where flocs sink to the bottom of the tank is called
Sedimentation
The process by which water turns into water vapour is called
Evaporation
There are two glasses of water. One with ice and one with room temperature water. On which glass would you observe condensation.
The one with ice
3 Plants are used for an experiment. Plant A is watered daily. Plant B is watered twice a week. Plant C gets no water. At the end of 3 weeks the height of the plant is measured.
What is the dependent variable in this fair test
The height of the plant
What substance is added to water that is treated to make it safe
Chlorine
True/False
All water sources are safe for drinking
False
When the temperature drops the air can't hold any excess water. This process is called
Saturation
Sedimentation is the process where
heavy particles settle at the bottom
True/False
Dew forms during the day when temperatures are high
False
What is the name of the chemical used to cause flocculation to happen in water treatment
Flocculant
Plant A gets water every day
Plant B gets no water
Which plant will grow after 7 days
Plant A
If dew is not formed and water vapour condenses far from the ground, what is formed
Fog
Chlorine is added to water to
kill germs
The floccs that settle at the bottom of the tank during sedimentation is called
waste water sludge