Chemistry and Properties
Water Molecules
Additional terms
Potluck
Potluck 2
100
Composed of 2 hydrogen atoms & one oxygen atom
What is water?
100
A water molecule has a positive end and a negative end, this is called what?
What is polarity?
100
When mixing sugar and water, water is called the
a.) solvent or b.) solute
What is solvent?
100
This is limestone. Acid rain caused the holes to form, what type of weathering is this?
What is chemical weathering?
100
Percent of salt water and freshwater on earth.
Salt water makes up 97%
Freshwater makes up 3%
200
Gas to a liquid? Example is a cloud forming.
What is condensation?
200
When a water molecule is attracted to or sticks to a solid surface.
What is adhesion?
200
What is The homogeneous mixture that results when a solute and a solvent combine.
What is a solution?
200
If water seeps into a crack in this rock and breaks it open, what type of weathering is that?
What is physical weathering?
200
Percent of water in living organisms and covering the earth?
Living organisms - 70%
Earth covered in water is 71-75% Any value from 71-75% is acceptable.
300
liquid to gas
What is evaporation?
300
When water molecules join tightly at the top of a stream and allows certain bugs to "walk" on water. This is due to ___?
What is surface tension?
300
This is what gets dissolved.
solvent, solute or solution
What is the solute?
300
When the wind picks up sand and moves it to a different location, this would be called what?
What is erosion?
300
Why does ice float - explain.
The molecule expands when it freezes which makes ice less dense than water.
400
Evaporation of water through a plant's leaves, stems and flowers?
What is transpiration?
400
This causes a water droplet to get bigger and bigger
Adhesion or Cohesion
What is cohesion?
400
Why is water known as the "universal solvent"?
It dissolves more substances than any other liquid.
400
Thermal energy is heat energy. Does the process of evaporation involve low or high thermal energy?
What is high thermal energy?
400
What percent of the world does not have access to clean drinking water?
What is 29%?
500
2 part question:
a.) How many elements are in H2O?
b.) How many atoms are in 3 molecules of H2O?
a.) 2 elements - hydrogen and oxygen
b.) H2O + H2O + H2O = 6 Hydrogen and 3 Oxygen: which totals 9 atoms.
500
Name the charges in a water molecule.
Hydrogen side -
Oxygen side -
Hydrogen is more positive
Oxygen is more negative (gains 2 electrons)
500
Why can water dissolve more substances than any other liquid?
It's due to its polarity and hydrogen bonds.
500
The amount of energy it takes to raise the temperature 1 degree. Example: A piece of metal in the sun would heat up quickly.
What is heat capacity?
500
What are the three main uses of freshwater?
What is agriculture, industry, and public health?