Significant Figures
When are captive zeros significant?
Always
What is the story about the demise of a certain royal man that can help you remember prefixes for metric units?
MEGA King Henry died by drinking chocolate milk many nights
How do you know how many digits to include when taking a measurement?
Look at the hashmarks and figure out what they mean. Your last digit should be an estimate (one digit beyond what the hashmarks represent)
Which type of variable goes on the Y axis?
Dependent
How many students are there in 6th grade?
130
When are trailing zeros significant?
When there's a decimal point in the measurement
How many milliliters are in a liter?
1000 mL
Describe a set of data that is precise, but not accurate
Data is consistent (close to each other) but do not match a known value
What is an independent variable?
A variable that is controlled/manipulated by the scientist
The name of one of Ms. Abrams' class pets in room 307
Gary, Snaily Jr., Bubbles, or Buttercup
How many sig figs are in this measurement:
0.003060 m
4
How many liters are in a hectoliter?
100 L
What is precision?
How close measurements are to each other (repeatability)
What is a controlled variable?
A variable that is kept the same across the experiment
Ms. Abrams' cat's name
Riley
How would you round this number to 2 significant figures?
2083.023
2100
1 inch = 2.54 cm. If you need to figure out how many inches are in 20.3 kilometers, describe the steps you would take
- 20.3 km times 1000 m per km
- times 100 cm per m
- times 1 in/2.54 cm
What is accuracy?
How close a measurement is to an accepted or known value
What is a control group?
A group that does not receive an independent value (treatment) and used as comparison to the experimental group
- Answer
- Units
- Correct # of sig figs
- Show work/calculations
How many significant figures are in this number?
18 people
Infinity (it's an exact count)
The only 3 countries that use the "English" system of measurement.
USA, Liberia, Myanmar
Name the curved line that liquids make in graduated cylinders
Meniscus
A scientist does an experiment to see how different amounts of food affect the weight of his 10 pet mice. What is the dependent variable in the experiment?
Weight of the mice
When are Ms. Abrams' office hours?
Thursday after school in room 306