Home
Flashcards
Preview
Measurements and Calculations
Home
Get App
Take Quiz
Create
What is measurement?
Its the quantitative observation/comparison
Contains two parts
: A number and unit
Scientific Notation
A technique used to express very large or very small numbers based on powers of 10
Ex. 1.23 X 10
^{2}
Standard Notation
The number before it is placed in scientific notation
Kilo
Symbol
: K
Value
: 1,000
SN
: 10
^{3}
Centi
Symbol
: c
Value
: 0.01
SN
: 10
^{-2}
Milli
Symbol
: m
Value
: 0.001
SN
: 10
^{-3}
Length is measured in...
SI unit: Meter (m)
1 inch =
2.54cm (exact number)
Solid volume is measured in...
SI unit: m
^{3 }
Gas or liquid volume is measure in...
SI unit: mL
1mL =
1 cm
^{3}
What is volume?
The amount of 3-dimensional space in m
^{3}
What is mass?
Amount of matter present
SI unit
: kg
Uncertainty in Measurement
A measurement always has some amount of uncertainty
Comes from limitations of techniques & equipment
Significant Figures
Can be used to indicate the uncertainty of a
measurement.
(0.57 ± 0.01)
Rules for counting SF's
All nonzero integers are
always
significant
Leading zeros
never
count as SFs
Captive zeros are
always
significant
Trailing zeros
are significant if
there is decimal pt
Unlimited number of SFs come from..
Exact numbers!
ex. 2.54 cm/in
1000 mL in a L
121 students in a room
An exact numbers are
Known with certainty
Defined numbers
: 1 minute = 60 seconds ect
Author
Anonymous
ID
259309
Card Set
Measurements and Calculations
Description
Chemistry 130; Chapter 2
Updated
2014-01-30T22:55:31Z
Show Answers
Home
Flashcards
Preview