Eighth Grade Tasks
Task A-1 9-3
This is your only science notebook.
You are "not prepared", sign the sheet if you don't have THIS notebook.
All measurements in this room will be SI (metric).
Write the base unit AND symbol for each measure:
How would you find the volume of a textbook?
What units would volume be?
Task A-2 9-4
1mL = 1cm3
Density = the amount of stuff in a space.
mass/volume = density
1. What is the density of a rock that has a
volume of 4cm3 and a mass of 2g?
2. Mass 10g and volume 5cm3?
3. 200cm= _____m
4. 500mm = _____ m
5. 10 km = _______ m
Task A-3 9-5
LEAVE SPACE FOR YOUR ANSWER!
- 1.What is the difference between mass and weight?
- 2. What is your weight in space (between planets)?
- 3. Why does science use mass instead of weight?
- 4. How do you measure volume in mL?
234 mL = _______ L
56 kg = _________ mg
24km = _______ cm
Challenge: How many seconds in a week?
Task A-4 9-6Science is the best way that humans can figure out what is true and correct.
We use experiments to support or not support (disprove) hypothesis.
A theory is something that has been repeatedly proven to be true.A theory fits ALL the available evidence.
Hypothesis - an idea you can test.1. If you made a new drug that helped people sleep, how would you "prove" it works?
Task A-5 9-9The density of water is 1g/mL, 1g/cm3Less dense floats on more denseNothing else makes more sense!
1. What is the density of a box with a volume of 20mL and mass of 2g?2. V = 2cm3 and M = 6g?3. M = 5g, V = 10mL?4. Which objects above will float in water?
Takeaway: Will you be able to measure mass and volume to get density?
What do you think will be the hardest part?
TASK A-6 9-10
Scientific Inquiry is the only method humans
have to be sure they are not wrong.
Steps of a Lab Report:
Question or Problem - what the whole experiment is about
Research - find out what is already known
Hypothesis - what you think might be an answer to the question
Finish the saying:
Less dense floats...
Takeaway: What are base units, and why are they useful?
Task A-7 9-13
Procedure - step-by-step directions
Data - what happened during the experiment
Data analysis - graphs and calculations
Conclusion - Hypothesis supported or not, restate data,
summarize experiment, identify possible errorsWhen you are finished copying,STUDY!TASK A-8 9-16
A variable is something that changes in the experiment.
Independent (manipulated, experimental) variable - the thing being tested, the scientist changes this (the cause). EMI variable
Dependent (responding) variable - what changes because the
independent variable changed (the effect). RD variable
If we are trying to find "Which detergent removes the most blood stains?"
Can you juggle?1. What would you need to do to learn to juggle?
- 1. What is the EMI variable?
- 2. What is the RD variable?
- Backwards Bike
Task A-9 9-17
A control group does NOT get the EMI variable.
Controlled variables are anything that can affect the experiment,
so we have to keep them the same.
1. What do we learn by using a control group?
2. In the "detergent" example, what things do we need to keep
the same when we are washing the clothes?
TASK A-10 9-18A scientist is trying to find out how caffeine affects people's heart rate.What could be the:Question:Hypothesis:EMI variable:RD variable:Controlled variables:Control Group:TASK A-11 9-19An observation is something that your senses tell you.An inference is a hypothesis about why the observation happened.Circle the observations, underline the inference.An animal print is found in the mud and the cooler's lidis ripped off and is empty, a bear must have been here.
Task A-12 9-23
quantitative - data you can count
qualitative - data based on a characteristic like color
What does "superstition" mean?
Humans are superstitious.
Write down as many "old wives' tales" as you can think of.
Example: Step on a crack, break your mother's back
- Sitting too close to the television screen is bad for your eyes.
- Don't go outside with wet hair or you will catch a cold.
- Don't swallow gum or it will stay in your stomach for seven years.
- Don't make silly faces or it will make the silly face permanent.
- Chocolate leads to acne.
- Eating carrots will improve your vision.
- Shaving makes the hair grow back thicker.
Period 4: TNwQcK3u
PERIOD 5: g4yoELNW
Pseudoscience uses scientific sounding words
to convince people of something that is not supported by science.
It often involves things that cannot be disproved.
List any examples of pseudoscience that you know about.
Task A-14 9-26
Placebo effect - Giving a sugar pill that people think is a drug,
it works up to 20% or the time.
A placebo would be given to the control group.
1. What do we learn from using a control group?
TASK A-15 9-27
Experiments in science should be double-blind.
That means that no one knows who is in the control group.
make sure you can open it!
Research: info on object
density of water is...
Hypothesis: I think the ____________ is _________ because __________
Procedure: Step by step, short bullets
TASK A-17 9-25
- What things should be in your conclusion?
- Why is it important to be specific in your procedure?
Task A-18 9-26A chemical change always makes a new substance.A physical change may look different, but doesn't make new substances.Click on the following links in order:Task A-19 9-271. What is everything made of?2. What is a molecule?3. Do you know the chemical formula for water?Task A-20 9-28
All compounds are molecules, but not all molecules are compounds.A compound has to be more than one element.O2 is a molecule, but not a compound.The big bang was the start of our universe 13.7 billion years ago.All matter, energy, time, and space were created.TASK A27 10-7
Is Diet Coke reacting with Mentos a physical or chemical change?
What chemical changes do you know?
You learned some last year...Your task is to write up a lab with the question:How does the number of mentos affect the amount of sodathat reacts?I need one lab from three or four students.QuestionResearch - Talk about whether this is a physical or chemical reaction and why.HypothesisMaterialsProcedureDataConclusion - Was hypo supported? Restate data,discuss physical/chem change, what you learnedTask A-28 10-8Task A-29 10-9A mixture is like a salad, a bunch of different elements andcompounds found together, but not connected.A compound is chemically connected by a bond, like H2O and CO2.The elements in a compound are in a set ratio.1. Name some things you think are mixtures2. Name some things you think are compoundsTask A-30 10-101. What is the positively charged particle in an atom?2. What is the negatively charged particle in an atom?3. What is the neutral particle in an atom?4. What two parts are in the nucleus of an atom?