Notes
metric system and Significant figures
Content of the notes (2)
Page 1
SCIENTIFIC METHOD
The study of scientific method is the attempt to discern the activities by which that success is achieved. Among the activities often identified as characteristic of science are systematic observation and experimentation, inductive and deductive reasoning, and the formation and testing of hypotheses and theories.
METRIC UNIT CONVERSION
Smaller unit to a bigger unit you divide.
Bigger unit to smaller unit you multiply.
CONVERTIONS
1000 m =1 km
1000 km = 1,000,000 m
1000 cm = 10 m
1000 m = 100,000 cm
1000 mm= 1 m
Page 2
Significant figures
Significant figures are important because they tell us how to round. The real point is to make sure that the answer you get isn't more precise than the numbers you started with.
When you get an ugly answer you look at the digits you divided or multiplied them for, you see how many digits there are and thats how many digits you leave while rounding it up.
Use the lower number when rounding up the number.
Density: Mass/Volume
82g/42cm3=1.952380952g/cm^3 82g/42cm^3=2.0g/cm^3 without significant figures with significant figures
82.103217g/42.338572cm^3=1.9123351gcm^3 rules determining if a number is significant or not: