Unit 0: Chemistry

Measurement

Quantity that has both a number and a unit

Scientific Notation

A method of expressing numbers that are too large or too small in a compact form using powers of ten.

Accuracy

How close a measurement is to the true value

Precision

how close a measurement are to one another

Accepted value

the true/correct measurement

Experimental value

measured in a lab experiment

error

difference between the accepted value and experimental value

percent error

absolute value of the error is divided by accepted value multiplied by 100%

sig figs

include all of the digits that are known

energy

capacity to do work

temperature

measure how hot/cold an object is

celcius scale

0 degrees marks freezing and 100 degrees marks boiling

kelvin scale

absolute temperature scale starting at 0 K

Density

Ratio of mass of an object to its volume

dimensional analysis

uses measurement units to convert values

Mega (M)

10^6

Kilo(k)

10³

Deci(d)

10^-1

Centi( c )

10^-2

Milli(m)

10^-3

Micro

10^-6

Nano(n)

10^-9

Pico(p)

10^-12