1. Lab #1 Experimental Design
Part 1
Properties of icebergs and sea ice

2. Icebergs Form From glaciers Sea ice forms from ocean water

3. Icebergs and sea ice can supply fresh water
This iceberg supplied the Inuit village of Pond Inlet with drinking water for 1 year.
Sea ice  drinking water for some polar expeditions

4. Essential Questions
How can sea ice which forms from ocean water be fresh enough for people to drink
Where does the salt go when sea ice forms
How can we test your ideas???

5. Below are the major steps involved in testing a hypothesis
Start with a title =
the effect of the independent variable on the dependent variable
Ex: The effect of temperature on malleability of iron
Independent variable = the thing being tested
Ex: independent variable = temperature
Dependent variable = the thing being measured or (data)
Ex: dependent variable = malleability

6. Hypothesis = prediction based upon both research and observations
Ex: if you increase temperature, then malleability will increase
Procedures = 2 steps
Describe groups
Control group = ex: normal room temp
Experimental groups =ex: different temperatures
State what you will measure and how
Ex: Measure malleability by trying to bend a strip of iron record observations on a scale of 1-5 where 5 is easy to bend
Controlled factors = to only test 1 variable you can only have one difference between gps
Ex: of things that must be the same: size and shape of iron strip

7. Use the design matrix to conduct an experiment to test your ideas about saltwater and ice formation

8. Title: The effect of freezing on salinity of water
Write a hypothesis
Based on what you know about icebergs what do you think the relationship is between freezing and salinity

9. Independent variable (the thing you are testing)
What is your independent variable
How can we test different amounts or types of this variable
What type of control should you include
How many repetitions are you willing / able to test

10. Dependent variable (data)
What do you need to measure for this experiment?
How can you measure it?

11. Controlled factors You can only test 1 variable at a time
What are some things that you need to keep constant between your groups
Salt concentration
Volume of water

12. Now you are ready to write your procedures
Be sure to
Explain how your groups will be set up
Explain what you will measure and how and when you will measure it.
Note that ocean water is about 3.56%salt
Refer to CHEM 101 making % solutions handout (last page of lab handout)

13. Have FUN