Item # ___________
Name: _________________________________
Science/Phipps/ Block # _________________
Date: ____________________________
Study Guide (Honors)
WATER TEST
Test Dates: A day (____) B day ( ____ )
DENSITY
1. Which two measurements would you have to take to solve for the density of water, and what laboratory
equipment would you need? (complete sentence required)
Mass (triple beam balance ) & Volume (graduated cyclinder)
2. What is the equation you would use to solve for density, and what is the metric unit for density of a liquid?
Mass / Volume (mass divided by volume )
3. What is the density of liquid water…
a) at about 4oC (as a liquid)? __1.0 g/ml______
b) at 0 oC (as a solid)? ___.92 g/cm3_______
c) at 100oC (as a gas)? ___.0006g/ml________
4. Why does water expand when it freezes? (complete sentence required)
When liquid freezes the movement slows down causing molecules to separate. Air
is trapped in the space thus decreasing density and allowing ice to float.
5. Which of the following substances would sink in water? (circle the answer)
aluminum , density 2.7 g/mL
oil, density .8 g/mL
WATER MOLECULE
6.
In the box to the right Draw the Bohr model of the water molecule.
Make sure you use a symbol to represent for oxygen & hydrogen:
 Electrons
 Protons
 neutrons
 positive and negative
 circle and label the type of bonds
Covalent bond
oak wood, density 0.8 g/mL
H – 0N & 1P
+
+
8p
8n
-7.
What is a polar molecule? (complete sentence required)
A polar molecule is when each end of the molecule has opposite charges.
8.
The fact that water is a polar molecule causes water to have what properties? (list 6)
Capillary Action
Surface Tension
Heat Sink
Cohesion
Universal Solvent
Adhesion
9.
In the boxes to the below, Draw and describe why two molecules of water come together.
Be sure to include in your drawing the bond and its name.
Written description of why water molecules combine:
Picture…
Because water is polar,
which means at each end
there are opposite charges.
Ionic
Hydroge
n Bond
.draw
10. Draw & label a model of the water molecules as they wouldsmall
exist (sorry)
as water vapor, liquid water, and solid water.
GAS
WATER
ICE
PROPERTIES OF WATER
Determine what property of water is being mentioned. Words can be used multiple times or not at all.
Word bank: cohesion - - adhesion - - surface tension – capillary action - - universal solvent
_Adehison______11. Water drops stick to the inside of your water bottle.
_____Cohesion _______________12. Water molecules are attracted to each other so rain drops form in the atmosphere.
__Cap. Action _______________13. Water climbs the tubes inside the trunk of a tree so that the tree tops receive water.
___Surface Tension ______________14. A paper clip is able to float on the surface of water if it is placed very carefully.
__Uni. Solvent____________15. Our oceans consist of salt water.
___Cap. Action or (Adhesion & Cohesion)___16. Water is absorbed up the holes in a sponge or paper towel.
____(Adhesion & Cohesion) or Surface Tension_____17. Water creates a meniscus inside a graduated cylinder.
__Uni. Solvent______18. Our blood dissolves and transports sugars and other vital chemicals throughout our body.
___Surface Tension_______19. Fish eggs rest on top of the water.
____ Surface Tension _____20. A water strider is capable of “walking on water.”
___Cap. Action _______21. Oil in a lantern rises up the wick.
WATER EXISTING AS A SOLID LIQUID OR GAS – choose solid , gas or liquid for your answer.
_____Gas________ 22 Which state of water would have the lowest density?
____Solid___________23 O0 Degrees Celsius
____Gas____________24. When water boils.
_____liquid_________25. Which state of water would have the highest density?
26. In water describe in writing what happens to the movement and arrangement of the molecules in a solid, liquid, and
gas.
Liquid water:
-Molecules are close together
-Molecule move slowly
DENSITY = 1.0 g/mL
-Molecules are widely
separated .
-Molecule move around
freely
-Molecules move rapidly
DENSITY=0.0006 g/mL
Ice:
-When water freezes, molecules move
away from each other and expand.
-Molecules move slightly.
-When ice forms it floats it is less dense
than water.
3
Water
Gas
DENSITY = .92 g/cm
Ice
31. Why is water considered the universal solvent? (complete sentence required)
Because water is a polar molecule and dissolve most substances.
32. What does solubility mean and what is a solution? (complete sentence required)
Solubility is the ability of a solvent (water) to dissolve a solute (solid) to create a solution.
In a solution there is only a physical reaction …..not chemical Example salt and water.
33. Give three reasons water is unique.
-Water is Polar
-Water is a universal solvent
-Water can creep up thin tubes (defy gravity, capillary action)