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2-1 Water and Solutions
Chapter 2 Section 1
20
Science
6th Grade
12/09/2008

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Cards

Term
Name 4 facts about water
Definition
1. water is made up of atoms bonded to form molecules.
2. water contains half as many oxygen atoms as hydrogen H2O.
3. Water molecues tend to stick together.
4. Water molecules are polar molecules (they are not magnetic!).
Term
What is water's chemical formula
Definition
H20...H+ H+ O-
Term
Why is a water molecule a polar molecule?
Definition
It is a molecule that has electrical charges. The positive hydrogen ends of one water molecule attract the negative oxygen ends of nearby water molecule.
Term
The positive hydrogen ends of one water molecule attract the _____ ______ ends of nearby water molecules.
Definition
NEGETIVE OXYGEN
Term
Name for facts about water's surface tension
Definition
1. It helps insects "skate" across the surface of the water.
2. It refers to the tightness across the surface of water.
3. It is caused by polar molecules attracting each other.
4. It causes raindrops to form round beads.
Term
What is water's surface tension mean?
Definition
It refers to the tighness across the surface of the water.
Term
How does surface tension force the surface of water to curve?
Definition
The molecules at the surface are being pulled by other molecules. The pulling forces the water to curve.
Term
4 facts about capillary action
Definition
1. it explains how water moves against the forces of gravity.
2. It is due to the attraction among molecules of water and surrounding materials.
3. It allows water to move through materials with pores.
4. ???It does not cause clothing to stay dry.
Term
A mixture that forms when one substance dissolves another is called a(an) __________. The substance that does the dissolving is called a(an) _______.
Definition
solution, solvent
Term
Why can water dissolve many substances?
Definition
It is a polar moleculue.
Term
List the 3 states of matter
Definition
1. solid 2. liquid 3. gas
Term
Solid water is called _________.
Definition
ice
Term
How water changes state:
Type of change MELTING
Definition
Starts as solid
ends as liquid
Term
How water changes state:
Type of change BOILING
Definition
starts as liquid
ends as gas
Term
How water changes state:
Type of change EVAPORATION
Definition
starts as liquid
ends as gas
Term
How water changes state:
Type of change CONDENSATION
Definition
starts as gas
ends as liquid
Term
How water changes state:
Type of change FREEZING
Definition
starts as liquid
ends as solid
Term
Name an example of evaporation
Definition
air drying your hair after swimming
Term
True of False: Ice is less dense than liquid.
Definition
True
Term
Define Specific Heat
Definition
The amount of heat needed to increase the temperature of a certain mass of a substance by one degree Celcius.
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