Significant Figures, Scientific Notation, Measurements, and the Scientific Method
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How many sig. figs.? 3874
4 sig. figs.
How many sig. figs.? 80.00
4 sig. figs.
How many sig. figs.? 0.0245
3 sig. figs.
How many sig. figs.? 3.207
4 sig. figs.
How many sig. figs.? 5,400
2 sig. figs.
How many sig. figs.? 4 marbles
unlimited sig. figs.
What is the rule with sig. figs. when multiplying and dividing numbers?
The number of sig. figs. in an answer is rounded to be the same number of sig. figs. in the number with the least amount of sig. figs.
What is the rule with sig. figs. when adding and subtracting numbers?
The number of sig. figs. in an answer is limited by the smallest number of decimal places.
Express 5345 in scientific notation
5.345 x 10^3
Express .005785
5.785 x 10^-3
What do you do with the exponents when multiplying in scientific notation?
Add the exponents.
What do you do when you divide in scientific notation?
Subtract the exponents.
What must be true about the exponents when adding and subtracting scientific notation?
The exponents must be the same. Then add the bases.
What two things must a measurement have?
It must have a number and a unit.
Where does a measurement go to?
The measurement goes to the first uncertain digit.
How many decimeters are in a meter?
10 decimeters are in a meter.
How many centimeters are in a meter?
100 centimeters in a meter.
How many meters are in a kilometer?
There are 1,000 meters in a kilometer.
How many millimeters are in a meter?
There are 1,000 millimeters in a meter.
How many nanometers are in a meter?
10^9 nanometers are in a meter.
How many micrometers are in a meter?
There are 10^6 micrometers in a meter.
How many meters are in a megameter?
1,000,000 meters are in a megameter.
Measurements should have how many decimal places?
2 no matter what.
What are the four main steps in the scientific method?
Observations, hypothesis, experiment, and a conclusion are the four main components.