CHEM Chapter E (DOES NOT CONTAIN THE CONVERSION FACTORS)

Qualitative

• Descriptive

  • Ex. Color, Liquid, Solid

Quantitative

• Measurements

• Counted Values

Density

Mass/Volume

SI unit of mass

kg

SI unit of volume

m³

SI unit of denisty

kg/m³

Solid/Liquid Density

g/cm³

Gas Denisty

g/L

1mL

1cm³

Celsuis to Kelvin conversion

T(k) = T(C) + 273.15

Celsius to Fahrenheit

1.8(C) + 32

Accuracy

Getting it right or close to right every single time

Precision

Getting the same area (answer) multiple times

Random error

An error that has equal probability of being too high or too low

Systematic error

is an error that leans towards being too high or too low (Inaccuracy of instrument)

When estimating how many digits should you geuss?

one

Multiplying and dividing sig fig rules

round to the smallest number of sigfigs used in the calculation

Adding and subtracting Sig fig rules

Round to the smallest number of digits after the decimal point

Rounding Rules

<.5 Round down

>.5 Round up

=.5 Round to an even number

ex. 18.55 --> 18.6

Intensive Physical Property

Independent of the amount of substance being measured

- Ex. Color, Melting point, Density, hardness

Extensive Physical Property

physical properties are dependent on amount

-Ex. Volume, mass