• 7th Grade Tasks


    Task A-1    9-3

    This is your only science notebook. 

    If you don't have THIS task in THIS book, you are NOT prepared!

    Science uses the SI measurement system, also known as metric.

    SI uses base units to change what you are measuring

    and prefixes to change the amount.


    Length - meter - m

    mass - gram - g

    volume - liter - L


    milli = .001              centi = .01            kilo = 1000


    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


    1.  1.What is the difference between mass and weight?
    2.  2. What is your weight in space (between planets)?
    3.  3. Why does science use mass instead of weight?
    4. 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       9-6
    Science is the best way that humans can figure out what is true and correct.
    We use experiments to support or not support (disprove) hypothesis.

    theory is something that has been repeatedly proven to be true.
    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       9-9

    The density of water is 1g/mL, 1g/cm3


    Less dense floats on more dense

    Nothing else makes more sense!

    1. 1. What is the density of a box with a volume of 20mL and mass of              2g?
    2. 2.      V = 2cm3  and M = 6g?
    3. 3.      M = 5g,  V = 10mL?

     4. Which objects above will float in water?


    Density Powerpoint

    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...  



    Density Eureka

    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 errors


    When you are finished copying,

    place a question in the Schoology Discussion

    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?"

    1. 1. What is the EMI variable?
    2.  2. What is the RD variable?
    3. Backwards Bike
    4. Task A-10                     9-17



    TASK A-9     9-17

    control group does NOT get the EMI variable.

    controlled variable is anything that can affect the experiment, 

    so we have to keep it the same.

    1.  What do we learn by using a control group?
    1.  In the "detergent" example, what things do we need to keep

           the same when we are washing the clothes?


    TASK A-10                9-18

    A scientist is trying to find out how caffeine affects people's heart rate.

    What could be the:



    EMI variable:

    RD variable:

    Controlled variables:

    Control Group:


    TASK A-11     9-19
    An 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 lid
    is 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.



    TASK A-13    9-25

    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.

    Example:  Horoscopes





    Task A-14         9-26

    Placebo effect - Giving a sugar pill that people think is a drug,

    it works up to 20% of 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.


    TASK A-16      9-30

    How do you tell the difference between the EMI variable

    and the RD variable?