CHM031 M1 SA W2 & W4 Flashcards
used to represent very large numbers
Scientific Notation
True or False: measurement does not always require a unit
False
expressed by numerical value & unit of measurement (quantitative observation)
Measurement and Uncertainty
portion is made with an estimation two digits are certain but the last is never an exact value (best estimate)
Measurement and Estimation
digits in a measurement (certain and uncertain) and expressed by a limited number of digits (conveys precision)
Significant Figures
Measure of length, mass, & volume (decimal system)
Metric system
standard system of measurement of physical quantities
Metric System
standard unit of length of metric system; the distance a light travel in a vacuum
Meter
how many seconds does a light travel in a vacuum
1/299,792,458 of a sec
amount of matter in an object (standard measurement of metric system)
Mass
it is measured on a balance and is independent on location
Mass
effect of gravity on an object and is measured on a scale; measures force against a spring
Weight
How much is the mass of Pt-Ir cylinder standard?
1 kg
1 kg is how many in pounds?
2.2015 lbs
it is the amount of space occupied by matter and the SI unit is m^3
Volume
metric volume is typically used in…?
mL or L
the cubic decimeter of water at 4 degrees Celsius
Liter
converts one unit of measure to another by using conversion factors
Dimensional Analysis
ratio of equivalent quantities
Conversion factor
composition of many mixtures
Percent
it involves the motion of small particles of matter
Thermal Energy
measurement of the intensity of thermal energy of a system
Temperature
flow of energy due to a temperature difference; flows from regions of higher to lower temp
Heat
range 180 degrees between Freezing and Boiling
Fahrenheit
