Chemistry and Properties
Water Molecules
Additional terms
Potluck
Potluck 2
All Water
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%
100
Water is called the Universal Solvent and can dissolve EVERYTHING. True or False
False
(Example, water did not dissolve the flour or sand).
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
Two part answer:
Percent of water in living organisms?
Percent of water covering the earth?
Living organisms - 70%
Earth covered in water is 71-75% Any value from 71-75% is acceptable.
200
What is transpiration?
Evaporation from plants
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.
300
Which is more dense: water or ice?
Water is more dense than ice.
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
During evaporation, is thermal energy increasing or decreasing?
Thermal energy is increasing. (The molecules are speeding up from a liquid to a gas.)
400
What percent of the world does not have access to clean drinking water?
What is 29%?
400
Why doesn't oil dissolve in water?
It is not polar
500
Does water have a high or low heat capacity?
Water has a high heat capacity. It takes a lot of energy to raise it one degree Celsius.
500
Name the charges in a water molecule.
Hydrogen side -
Oxygen side -
Hydrogen is more positive (Say Hi with a smile) :)
Oxygen is more negative (gains 2 electrons)
500
Water is the Universal Solvent and can dissolve more substances than any other liquid? Why can it dissolve more substances - like sugar and salt?
It's due to its polarity and hydrogen bonds.
500
What is heat capacity?
The amount of energy it takes to raise the temperature of a substance (1 degree Celsius).
500
What are the three main uses of freshwater?
What is agriculture, industry, and public health?
500
Food coloring is polar. Will food coloring dissolve in water? Why?
Yes it will dissolve in water due to both being polar.