Level 12 Level 14
Level 13

Units, Scientific Notation, & Significant Figures


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British System
It is the system of units primarily used by the United States. It is not the system of units used in science
Metric system -
A standardized system of units based on 10
precision
closeness to a set of measurements of the same quantity madeht same way
significant figures
All the digits that can be known precisely in a measurement, plus a last estimated digit
Si
An element in the 3rd period considered a metalloid
kg
kilogram
s
What symbol is used to denote the total distance travelled around a circle?
Cd
Cadmium
mol
what si the unit for Amount of a Substance
Density
amount of mass per units volume
Volume
A measure of space (lwh)
least Sig Fig number
Number of Sig Figs during Multiplication and Division
fewest decimal places of figure
Number of Sig Figs during addition and Subtraction
count
Non-Zero Intagers, ex. 1473.
never count
Leading zeros, ex. 0.00024
650g
6.5*10^3
45km
4.5*10^1
251000dL
2.51*10^5
0.0467kL
4.67*10^-2
0.000000002*10^2mm^3
2*10^-7 mm^-3
4820000 kL
4.82*10^6 kL
0.00234 mg
2.34*10^-3 mg
7.02 cm
7.02*10^1 cm
0.0301256 L
3.01256*10^-2 L
210.03*10^-10 dg
2.1003*10^-2 dg
5.9*10^-3 cL
0.0059 cL
6.43*10^-6 g
0.00000643 g
2.1*10^-7 m
0.00000021 m
4.2*10^1 dm
42 dm
346.69*10^2 mm^3
34669 mm^3
4.76*10^10 cm^3
47600000000 cm^3
8.7492*10^5 kg
87492 kg
2.9*10^4 mm
29000 mm
2.6*10^-3 cL
0.0026 cL
0.65*10^10-2 dg
0.065 dg
2000g
1
2
Determine the number of Significant figures in the following: 0.00035L
0.502mg
2
5.7800dg
3
120.dm
3
482800m
4
0.00702mm
3
602000ml
3
24dl
2
0.10100cm
2
4568 cL
457 cL
790000
789507 cg
0.00005796kg
0.00005800
123477km
123000km
0.006996cm^3
0.007000cm^3
0.001002m^3
0.001000m^3
0.0548579kL
0.0548600kL
6567.2455km^3
6600.0000km^3
4594221 mm^3
4594200 mm^3
1.66*10^6dg
1658690 dg
7.746765*10^-7mm
0.0000007746765 mm
0.0037557cm
3.76*10^-3cm
0.0496g
4.96*10^-2g
2901450m
2.901*10^6m
900001mg
9.00*10^5mg
unit
a specific category that describes a number
meter
a unit of length for longer things, like a race track
kilogram
a unit of mass used for larger objects, like a pineapple
second
base unit of time in the metric system
coulumb
base unit of charge in the metric system
derived unit
A unit defined by a combination of base units
Newton
Thought of light as a particle. If he was correct, light should travel faster in a denser medium.
Deci-
10^ -1
Hecto-
10 to the second power (100)
Centi-
10^ -2
Kilo-
10^ 3
Milli-
10^ -3
U.S. Customary System of units
uses foot, inch, mile, pound, bushel, peck, etc. Unwieldy and causes unnecessary confusion
scientific notation
_______ is used to represent a very large or very small number as a power of 10
What does a positive exponent indicate?
true location of decimal point is to the right of where it is written.
What does a negative exponent indicate?
true location of decimal point is to the left of where it is written
How to read 17.041,301
seventeen and forty-one thousand, three hundred one millionths
How to read 0.0,412?
four hundred twelve ten thousandths
What must we be careful not to do when using measurements in calculations?
must be careful not to assume that the answer we get is more precise than warranted by the preciseness of the measurements used to make the calculations.
Ex: ±.03cm.
How to state the range of uncertainty of a measure?
When is range of uncertainty not helpful?
when determining the accuracy of a calculation in which more than one measurement is used
assume the last digit of the measurement is a guess
What must we do when we cannot be sure of the instrument used to make a measurement?
true
(ex mg)