Che. Test

Qualitative observarions

Observations which are NOT measured using numbers ie. Color, texture odor

Quantitative observations

Observations which are measured using numbers ie. Mass, volue, temperature of a sample

Weight

Amount of force gravity puts on matter

Mass

Amount of space an object occupies

Density

Mass divided by volume (g/mL)

d = m/v

Volune

Length x width x height

Quantity

What is being measured

Base unit

Unit without a prefix (meter, literally, gram)

Scientific notation

A format in which a quantity is expressed as a number between 1 and 10 multiplied by a power of 10

Estimated digit

One digit read beyond the calibration of your measuring device

Calibration

Smallest increment on measuring device

Limitation

Estimate one number place past the smallest increment on the device

Accuracy

How close are value is to the true (actual value)

Precision

How close together are set of values are to one another

Leading zeros

Never significant

Captive zeros

Always significant

Lagging zeros

Only significant if there is a decimal point in the number

Mult/Div sig figs

Measurement with least number of sig figs determines the num of sig figs

Add sub. Sig figs

The answer is expressed to the same number place as the least precise measurement

Exact numbers

Have infinite sig figs