DO NOW:
SWBAT identify different variables within an
investigation
Enter Silently
Grab Materials, notebooks, folders
Begin Do Now
1. What is the difference between and qualitative
and a quantitative observation?
2. What kind of observations are you making in
the measurement lab?
Finish Measurement Scavenger Hunt
• You’ll have 20 minutes to complete the
scavenger hunt
• Work with urgency
Conclusion Ticket
1. What is the mass of this object?
2. What tool would a scientist use to measure
Mass?
3. What is the measurement on the
graduated cylinder?
4. What tool would you use to measure
the materials in the table.
Type of
Material
>600mm
Stone
200-600mm
Rock
76-199mm
100196.4mm
134.5175.2mm
Gravel
Quartz
Do Now
• Check what clicker
number you have by
looking in the top left
corner of the front
cover of your notebook
• When Mr. Wallace calls
your group, come grab
you clickers.
(Mass) (Acceleration) = Force
Do Now
Is the following statement an inference, a
qualitative observation, or a quantitative
observation?
• “Look a U.F.O., there must be aliens in it.”
The Scientific Method
Why is this
important?
It gives
scientists an
outline to test
each other’s
results, and
critique it for
accuracy
• HYPOTHESIS: testable prediction used to guide
the design of an experiment
• CONTROL: Standard for Comparison
• CONSTANT: Factor in the experiment that is kept
the same
• INDEPENDENT VARIABLE: Factor that is adjusted
by the experimenter (you change this about the
experiment it’s something you choose)
• DEPENDENT VARIABLE: Factor whose value
depends on the independent variable (effect you
measure during experiment)
Which is the independent and which is
the dependent variable?
How do different liquids affect
plant growth?
Notes Variables
Example: the
liquid used to
water each plant
1. What are
the
constants?
2. What is the
control?
Example: the
height or health of
the plant
Which is the independent and which is
the dependent variable?
• The amount of time it takes you to
get out of bed in the morning and
the amount of sleep you got last
night.
Which is the independent and which is
the dependent variable?
The number of days since your
last hair cut and the length of
your hair
Plant Example Constants? Control?
Variables?
•
•
•
•
Think-Pair-Share
What are the constants?
What is the control?
What is the dependent variable?
What is the independent variable?
Hypothesis Writing
Written in an If, Then, Because statement
No Personal pronouns
Independent variables go after IF
Dependent variables go after THEN
Reasoning goes after BECAUSE
EXAMPLE
1. If hair is colored (what will change= independent)
2. Then colored hair will grow less
(what will happen/ what is measured = dependent)
3. Because hair color has harsh chemicals that damage
hair preventing growth.
Example Hypothesis
• If, then, because statement
– Experiment Question = Does increased
sleep cause higher grades?
– Hypothesis – If the amount of sleep is
increased then the grade average of
students will increase because sleep
allows students to be alert and focused in
class.
In the Homework: Highlight the
following:
• If = What is changed about the independent
variable
• Then = what happens to the dependent variable
• Because = explain why the dependent will
change
Practice
• Identify the parts of the experiment
• Write a hypothesis based on the question for
each experiment.
– Highlight the independent variable
– Underline the dependent variable
DO NOW:
SWBAT identify different variables within an investigation
Enter silently
Grab materials, notebooks, folders
Begin do now
1.
2.
3.
4.
Write these questions down
What is the control?
What are the constants?
What is the independent variable?
What is the dependent variable?
https://youtu.be/LSZE6WofLAs
House Keeping
• Sub
• Homework Hypothesis Writing
• Struggles?
Gobbstopper Lab
1. Read the procedures carefully
2. Fill out the pre-lab questions
3. Create a data table for your qualitative and
quantitative observations. Before and after
experiment observation data table (what is
diameter? How can we measure the mass?)
4. Write your hypothesis
Once you have finished, and have read the
procedures, show your lab report to me and I will
okay you to begin your lab.
Do Now
Gobstopper Day 1
• Keep volume at a 3 during lab
When you have finished the lab, you need to CLEAN
UP!
1. Pick all gobstoppers out of petri dish and THROW
THEM AWAY
2. Pour liquid down the drain and RINSE petri dish
3. DRY petri dish with paper towel
4. BRING dried petri dish and stop watch back UP TO
THE FRONT
5. Make sure your lab table is cleaned up completely!
Answer the questions on the
conclusion section of your lab sheet.
(no personal pronouns!)
• What were the results (was your hypothesis correct?
Why or why not?)
• What can we claim our liquid did to the Gobbstopper?
(no personal pronouns)
• What are some pieces of evidence? (no personal
pronouns)
• What is our reasoning? (no personal pronouns- uses
scientific ideas or facts)
Claim, Evidence, Reasoning
• Whenever you make a claim…
• You must support it with evidence and reasoning.
 Example of a bad C.E.R.
The liquid made the Gobbstopper dissolve.
Example of a good C.E.R.
The liquid made the Gobbstopper dissolve as
evidenced by the mass and diameter values
decreasing from 2g to .5g, and 2cm to .8cm, because
the Gobbstopper is made of sugar, and sugar is soluble
in most liquids.
Write your own C.E.R. for the Lab