Name __________________________ Block ____________ Date _____________
Please use your notes to GUIDE you through your study guide.
Please use your notes to GUIDE you through your study guide.
1. When water vapor changes to liquid water
__Condensation___________________
2. When liquid water changes to water vapor
__Evaporation___________________
3. What is the chemical formula for water?
__H2O___________________
4. Water molecules are polar, which mean they act like
__Magnets___________________
5. What happens to water molecules when they freeze? They Expand or Shrink
6. When you put ice into water, it __Floats______________________
7. What elements make up one molecule of water?_2 Hydrogen__________
and _1 Oxygen___________________.
8. The positive end of a water molecule is found near
__Hydrogen__________________
9. The negative end of a water molecule is found near the
___Oxygen______________
10.Water can dissolve many substances so it is called the __Universal
Solvent___
11.What causes surface tension?
The top layer of a body of water behaves as if it was an elastic or stretch
skin. This is surface tension. Surface tension is caused by the attraction of
water molecules to other water molecules. Example: When a bug is able to
land on top of the water without sinking.
12. Paper clips were able to float on water due to Surface Tension.
13.What does it mean when we say that water is a Polar molecule?
Water has a negative side and a positive side. The hydrogen end is positive and
the oxygen end is negative.
14.Compare the movement (speed) of the molecules in 3 temperatures of waterHot – Fast
Warm- Medium
Cold- Slow
15.Use the space below to draw a model of a water molecule. Be sure to label
each part of your mode including the + and - ends.
+ charge
2 Hydrogen molecules
Oxygen molecule
– charge
16.Define Cohesion-(include an example):
Cohesion is the attraction of water molecules to other water molecules.
This caused by the water molecule’s polarity. The hydrogen end is positive
and the oxygen end is negative. Each molecule behaves like a little
magnet. The hydrogen end of one water molecule is attracted to the
oxygen end of another water molecule. Example: Drops on a penny
experiment- the drops continued to grow in size.
17.Define Surface Tension-(include an example):
The top layer of a body of water behaves as if it was
an elastic or stretch skin. This is surface tension.
Surface tension is caused by the attraction of water
molecules to other water molecules. Example: When
a bug is able to land on top of the water without
sinking.
18.To the right is surface tension in action.
Explain what is happening.
The weight of the paper clip is being supported by
the water’s surface tension. The top layer of a body
of water behaves as if it was an elastic or stretchy
skin. This is surface tension. Surface tension is caused by the attraction of
water molecules to other water molecules.
19.Define Adhesion (include an example):
Adhesion is the attraction of water molecules to other materials. Example:
When you dip your hand into water, the water sticks to your skin, making
it wet.
20.Capillary action is what allows redwood trees to be able to receive water all
the way to the top of its branches. What characteristics allow this to
happen?
Water’s cohesion and adhesion allows water to travel up against gravity.
21. Why is water the universal solvent? What property of water allows it to
dissolve so many things?
Water can dissolve almost all substances. This is possible because water is
a polar molecule.
22. For each property of water, give one example of how it help nature or living
things.
Cohesion-Makes rain drops get bigger
Capillary action-Plants get the water from soil
Universal Solvent-Dissolves vitamins and minerals for plants
Ice Floating-Fish survive under the ice
23.In the boxes provided, draw pictures of the arrangement of water molecules
as a liquid, solid, and gas. Circle the box where the molecules are moving
the fastest.
Solid
Liquid
Gas
24. Match characteristics with the correct phase of water.
Choices: Liquid Water, Ice, Water Vapor
Takes the shape of the container.
Liquid Water, Water Vapor
The water molecules are moving the
Ice (solid phase)
slowest.
The molecules can move freely and
Liquid water
bounce off each other.
Water molecules are moving the
Water Vapor (gas phase)
fastest.
Water molecules have the largest
Liquid Water
temperature range in this phase. (0100 oC)
25. How can fish and other aquatic organisms live in a frozen pond?
What characteristics allow this to happen?
Ice (solid water) is LESS DENSE than liquid water. This causes water to
freeze from the top down. Fish extract oxygen from the water below the ice
with their gills. So they never have to come to the surface. Also, when the
water is cold, their metabolism slows down and they need less oxygen, so
there is enough in the lake or pond to last them through winter.
26. Fill in the blanks below for the states of matter in which H2O can be found,
and the word describing the change of state (transition):
Starting state
Transition Word
Ending State
A. solid(ice)
melting
liquid
B. liquid
vaporization
gas
C. gas
condensation
liquid
D. liquid
freezing
solid
E. solid
sublimation
gas
F. gas
deposition
solid
Use words from the word bank to fill in the blanks: SLO 6.5b
Solid, Liquid, Gas, Evaporation, Energy, Pressure, Molecules, Matter, Vapor,
Physical Change, Surface Tension
27. In order for matter to change state, it must go through a Physical Change.
28. Solid, liquid, and gas are the three most common states of Matter.
29. By adding or removing Energy, we can change the state of matter.
30. We can determine the state of matter by observing how closely its
Molecules are connected.
31. The reason it hurts when you do a belly flop into a swimming pool is because
of Surface Tension.