Name: __________________________________________________
Block:_________
STUDY GUIDE: Osmosis/Diffusion, Measurement, Source of Error
Define:
1. Diffusion: The movement of substances (other than water)
through air, water, and a selectively permeable membrane
2. Osmosis: The movement of water through a selectively permeable
membrane
3. Equilibrium: when the concentration of two or more substances is
balanced (when molecules are balanced or spread out)
4. Selectively Permeable: Only allows certain substances to pass
through
Why doesn’t diffusion use any energy? The particles or molecules are
already in motion and want to be at equilibrium, so they move easily to
reach equilibrium and do not need energy.
Draw:
Diffusion
-the movement of molecules or
particles
-from high to low concentration
-through air, water, or a selectively
permeable membrane
Equilibrium
-when the concentration of two or
more substances is balanced or
spread out
Osmosis
-the movement of water only
-from high to low concentration
-though a selectively permeable
membrane
Selectively Permeable
-allowing only certain substances
to enter or exit
Name: __________________________________________________
Block:_________
Compare and Contrast Osmosis and Diffusion
The movement of
water only
Through a
selevtively
permeable
membrane
-The movement of
molecules other than
water
No energy required
-through air and water
Draw what the following solutions look like at equilibrium:
Given
At Equilibrium
Already in
equilibrium
Given
At Equilibrium
Name: __________________________________________________
Block:_________
Source of Error
Define source of error: ___Experimental errors cause doubt about the accuracy of
your data. Experimental errors are not under the control of the experimenter.
Human mistakes are caused by the experimenter.___
Scenario
A thunderstorm occurs while Matt
and Allison are measuring
evaporation rates of a liquid.
Lyndria is testing the time it takes a
ball to drop from different heights.
There is wind resistance during each
trial.
Felecia is investigating whether
Bounty or Brawn Paper Towels
absorb water faster. While she is
conducting her experiment, Tabitha
spills water on her table.
Human Mistake or What do you do?
Experimental Error
Experimental Error Include the problem
in your experimental
report
Experimental Error Include the problem
in your experimental
report
Human mistake
Complete the
experiment again
Answer the Questions:
1. At 0 ⁰C, water is: (circle one) SOLID/LIQUID/GAS.
2. At 37 ⁰C, water is: (circle one) SOLID/LIQUID/GAS.
3. At 105 ⁰C, water is: (circle one) SOLID/LIQUID/GAS.
Name: __________________________________________________
Block:_________
Measurement
Answer the Questions:
-3 °C
4. At 0 ⁰C, water is: (circle one) SOLID/LIQUID/GAS.
5. At 37 ⁰C, water is: (circle one) SOLID/LIQUID/GAS.
6. At 105 ⁰C, water is:
(circle one) SOLID/LIQUID/GAS.
2 g/ml
Complete the Table: 2 g/ml
3.1 cm
Definition
Tool(s)
Units
Length
Distance
Ruler or Meter
Stick
centimeter (cm)
millimeter (mm)
Mass
The amount of matter in an object
triple beam
balance
grams (g)
Volume
Amount of space an object takes up
For irregular-use displacement methods
For regular solids-use L x W x H
Graduated
Liter (L) or cubic
Cylinder or Ruler centimeter (cm3)
Temperature
The amount of heat in an object
thermometer
degrees Celcius
(°C) or Kelvin (K)
Density
Amount of molecules in a certain space
Mass ÷ Volume
grams/liter
(g/cm3)
(M/V)