today’s agenda 9/20 ftf 3-2-1 list 3 safety rules you need to follow in a lab. list 2 things you...
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TODAY’S AGENDA 9/20FTF 3-2-1
List 3 safety rules you need to follow in a lab.
List 2 things you can not do in a lab.
Name 1 person you should tell if you get hurt or spill something in a lab.
FTF 3-2-1
List 3 safety rules you need to follow in a lab.
List 2 things you can not do in a lab.
Name 1 person you should tell if you get hurt or spill something in a lab.
Homework• Begin Scientific Method Vocabulary Assignment (due next
Tuesday)
TODAY IN SCIENCE CLASSFTF ReviewExtra Credit OpportunityScientific Method BrainPop IntroHypothesis “Flow Chart” (buddy activity)Distribute Scientific Method 2-Column Notes & TextBegin Drops on a Penny Lab
SWBAT List the independent and dependent variable in an experiment.
UNIT 2: Scientific Method
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TODAY’S AGENDA 9/23FTF
Paperclip DemonstrationFTF
Paperclip Demonstration
Homework• Scientific Method Vocabulary Assignment (due Tomorrow!)
TODAY IN SCIENCE CLASSFTFDistribute Scientific Method 2-Column Notes & TextBegin Drops on a Penny Lab
SWBAT Develop a hypothesis and subsequent experiment based on an observation.
UNIT 2: Scientific Method
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PAPER CLIP DEMONSTRATION – 9/21TAKE A GUESS: HOW MANY PAPERCLIPS CAN WE FIT INTO A GLASS BEFORE THE WATER RUNS OVER?
Cohesion: water molecules are attracted to other water molecules. The oxygen end of water has a negative charge and the hydrogen end has a positive charge. The hydrogen of one water molecule are attracted to the oxygen from the other water molecules. This attractive force is what gives water is cohesive properties.
Surface Tension: Surface tension is the name we give to the cohesion of water molecules at the surface of a body of water. The cohesion of water molecules forms a surface “film” or “skin/” sSome substances may reduce the cohesive force of water, which will reduce the strength of the surface “skin” or the water.
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DROPS ON A PENNY LABWITH YOUR PARTNER
We will learn about the steps of the scientific method while conducting a scientific experiment.
In this lab: We will test how many drops of liquid will fit on a
penny. We will write a hypothesis to test. We will use two different liquids. We will learn about independent, dependent and
control variables. We will complete a data table. We will write a conclusion based on our data.
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The Scientific Method involves a series of steps that are used to
investigate a natural
occurrence.
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Problem/QuestionFormulate a Hypothesis
ExperimentCollect and Analyze Results
ConclusionCommunicate the Results
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What’s the Question? Consider what we are
going to do. We will test how many
drops of liquid will fit on a penny using different mixtures of water and soap.
So, what question are we going to test? Write down what you think it is.
DROPS ON A PENNY LABWITH YOUR PARTNER
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Hypothesis Take a look at the question that we are asking: Does
the amount of soap mixed with water affect how many drops will stay on a penny?
How can we turn this question into a hypothesis? If ……………. Then………………..
So, what hypothesis can we test? Remember, a hypothesis needs to be testable.
Write your hypothesis on the Drops of Penny Lab Investigation worksheet.
DROPS ON A PENNY LABWITH YOUR PARTNER
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TODAY’S AGENDA 9/24FTF (homework out please!)
Write hypotheses based on the observations on the next slide. Work with your buddy!
FTF (homework out please!)Write hypotheses based on the observations on the next slide. Work with your buddy!
Homework• Complete Drops on a Penny Lab!
TODAY IN SCIENCE CLASSFTFDrops on a Penny LabFinish Scientific Method 2-Column Notes & Text (with buddy)
SWBAT Use data collected during an experiment to write a conclusion and support or reject their hypothesis.
UNIT 2: Scientific Method
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FTF 9/24
Reminder: a hypothesis is a testable statement based on an observation. Usually they are stated If……. Then…….
Problem: Your sunflower plant stopped growing.Observation: Last week you moved the plant from
a sunny windowsill to the basement.1. Write a hypothesis based on the observation.2. Write an experiment to test the hypothesis.
Problem: It’s winter time and your bedroom is really chilly at night.
Observation: Last year you remember moving a box over the heater vent.
1. Write a hypothesis based on the observation.2. Write an experiment to test the hypothesis.
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Procedure: follow directions on the lab sheet. Use eyedropper to place drops of plain water on the
penny. (one at a time, slowly!) until any amount of water runs over the edge.
Count the number of drops and record in the table. Repeat steps. Repeat with soap mixture.
DROPS ON A PENNY LABWITH YOUR PARTNER
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After you finish the lab activity, use the text to finish the 2-column notes.
You can choose to work alone or with your partner.
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STEPS OF THE SCIENTIFIC METHOD
1. Problem/QuestionProblem/Question: Develop a question or
problem that can be solved through experimentation.
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STEPS OF THE SCIENTIFIC METHOD
3. Formulate a HypothesisFormulate a Hypothesis: Predict a possible answer
to the problem or question.Example: If soil
temperatures rise, then plant growth will increase.
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STEPS OF THE SCIENTIFIC METHOD
4. ExperimentExperiment: Develop and follow a procedure.
Include a detailed materials list.
The outcome must be measurable (quantifiable).
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STEPS OF THE SCIENTIFIC METHOD
5. Collect and Analyze Collect and Analyze ResultsResults: Modify the
procedure if needed.Confirm the results by
retesting.Include tables, graphs, and
photographs.
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STEPS OF THE SCIENTIFIC METHOD
6. ConclusionConclusion: Include a statement that accepts or
rejects the hypothesis.Make recommendations for further study and possible
improvements to the procedure.
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STEPS OF THE SCIENTIFIC METHOD
7. Communicate the Communicate the ResultsResults: Be prepared to
present the project to an audience.
Expect questions from the audience.
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Let’s put our knowledge of the Scientific Method to a realistic example that includes some of the terms you’ll be needing to
use and understand.
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PROBLEM/QUESTION
John watches his grandmother bake bread. He ask his
grandmother what makes the bread
rise.She explains that
yeast releases a gas as it feeds on sugar.
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PROBLEM/QUESTION
John wonders if the amount of sugar
used in the recipe will affect the size of the bread loaf?
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CAUTION!Be careful how you use effect and
affect.Effect is usually a noun and affect,
a verb.“ The effect of sugar amounts on
the rising of bread.”“How does sugar affect the rising
of bread?”
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John talks with his teacher and she
gives him a Experimental
Design Diagram to help him set up his
investigation.
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FORMULATE A HYPOTHESIS
After talking with his teacher and
conducting further research, he comes
up with a hypothesis.“If more sugar is added, then the bread will rise
higher.”
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HYPOTHESIS The hypothesis is an educated
guess about the relationship between the independent and
dependent variables.Note: These variables will be defined in the next few slides.
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DO YOU KNOW THE DO YOU KNOW THE DIFFERENCE BETWEEN THE DIFFERENCE BETWEEN THE INDEPENDENT AND INDEPENDENT AND DEPENDENT VARIABLES?DEPENDENT VARIABLES?
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INDEPENDENT VARIABLE
The independent, or manipulated variable, is a factor that’s intentionally
varied by the experimenter.John is going to use 25g., 50g., 100g., 250g., 500g. of
sugar in his experiment.
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DEPENDENT VARIABLE
The dependent, or responding variable, is the
factor that may change as a result of changes made in the independent variable.
In this case, it would be the size of the loaf of bread.
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EXPERIMENT
His teacher helps him come up with a
procedure and list of needed materials.
She discusses with John how to
determine the control group.
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CONTROL GROUP In a scientific experiment, the control is the group that serves as the standard of comparison.
The control group may be a “no treatment" or an
“experimenter selected” group.
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CONTROL GROUP The control group is exposed to the same conditions as the experimental group, except
for the variable being tested.All experiments should have a
control group.
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CONTROL GROUP Because his grandmother always used 50g. of sugar in her recipe, John is going to use that amount in his
control group.
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CONSTANTS
John’s teacher reminds him to keep all other factors the same so that any
observed changes in the bread can be attributed to the variation in the
amount of sugar.
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CONTROLS
The constants in an experiment are all the factors that the
experimenter attempts to keep
the same.
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CAN YOU THINK OF SOME CAN YOU THINK OF SOME CONTROLS FOR THIS CONTROLS FOR THIS EXPERIMENT?EXPERIMENT?
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CONTROLSThey might include:
Other ingredients to the bread recipe, oven
used, rise time, brand of ingredients, cooking
time, type of pan used, air temperature and humidity where the
bread was rising, oven temperature, age of
the yeast…
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EXPERIMENTJohn writes out his procedure for his experiment along
with a materials list in his journal. He has
both of these checked by his
teacher where she checks for any safety
concerns.
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TRIALS
Trials refer to replicate groups that are
exposed to the same conditions in an
experiment.John is going to test each sugar variable 3
times.
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COLLECT AND ANALYZE RESULTSJohn comes up with a table he can use to record his data.John gets all his
materials together and carries out his
experiment.
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SIZE OF BAKED BREAD (LXWXH) CM3
Amt. of Sugar (g.)
1 2 3 AverageAverage
Size (cmSize (cm33))
25 768 744 761 758
50 1296 1188 1296 1260
100 1188 1080 1080 1116
250 672 576 588 612
500 432 504 360 432
Size of Bread Loaf (cmSize of Bread Loaf (cm33))
TrialsTrials
Control group
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COLLECT AND ANALYZE RESULTS
John examines his data and notices that his control
worked the best in this experiment,
but not significantly better than 100g.
of sugar.
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CONCLUSIONJohn rejects his hypothesis, but
decides to re-test using sugar
amounts between 50g.
and 100g.
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EXPERIMENT
Once again, John gathers his materials
and carries out his experiment.
Here are the results.
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CAN YOU TELL WHICH CAN YOU TELL WHICH GROUP DID THE BEST?GROUP DID THE BEST?
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SIZE OF BAKED BREAD (LXWXH) CM3
Amt. of Sugar (g.)
1 2 3 AverageAverage
Size (cmSize (cm33))
50 1296 1440 1296 1344
60 1404 1296 1440 1380
70 1638 1638 1560 1612
80 1404 1296 1296 1332
90 1080 1200 972 1084
Size of Bread Loaf (cmSize of Bread Loaf (cm33))
TrialsTrials
Control group
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CONCLUSIONJohn finds that 70g. of sugar produces the largest loaf.
His hypothesis is accepted.
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COMMUNICATE THE RESULTS
John tells his grandmother
about his findings and prepares to
present his project in Science
class.
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