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
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?Density
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. 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...
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. What is the EMI variable?
- 2. What is the RD variable?
- Backwards Bike
- Task A-10 9-17
TASK A-9 9-17
A control group does NOT get the EMI variable.
A controlled variable is anything that can affect the experiment,
so we have to keep it the same.
- What do we learn by using a control group?
- 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:
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
TASK A-13 9-25
- 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.
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% 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?