Unit 2 Flashcards
1
Q
Accuracy
How can we measure accuracy?
A
How close a measurement is to the accepted value
Find the % error
2
Q
Precision
How can we measure precision?
A
How close a series of measurements are to each other
Find the range
3
Q
Formula for % error
A
I experimental - accepted I
_____________________ x 100
accepted
4
Q
Rules for Significant figures
Why do we use sig figs?
A
- All non-zero numbers are significant
- Zeroes between non-zero numbers are significant (sandwich rule)
- Zeroes at the end of a number are only significant if there is a decimal point present
- Zeroes at the beginning of a number are not significant
Used to indicate the precision of a measurement
5
Q
What is a base unit?
A
A defined unit in a system of measurements that are based on an object or event in the physical world
6
Q
What are the 7 base units
A
Kila Hecta Deka Base Deci Centi Milli King Henry died by drinking chocolate milk
7
Q
mass length time quantity/amount temperature
A
kilogram (kg) centimeters (cm) seconds (s) mole (mol) Kelvin (K)
8
Q
Equation for converting to Celsius
A
Degrees Celsius=K - 273
9
Q
Equation for converting to Kelvin
A
Kelvin=Celsius + 273
10
Q
Scientific notation:
- Left = +/- power of ten
- Right = +/- power of ten
A
left=negative
right=positive
