###
chemistry

the study of the composition, structure, and properties of matter and the changes it undergoes

###
model

an explanation of how phenomena occur and how data or events are related

###
significant figure

a value calculated by subtracting the experimental value from the adopted value, diving the difference by the accepted value, and then multiplying y 100

###
accuracy

the closeness of measurements to the correct or accepted value of the quality measured

###
volume

amount of space occupied by an object

###
density

ratio of mass to volume or mass divided by volume

###
conversion factors

ratio derived from the equality between two different units that can be used to convert from one unto to the other

###
precision

closeness of a set of measurements of the same quantity made in the same way

###
scientific notation

numbers written in the form M x 10n where the factor M is the number grater than or equal to 1 but less than 10 and n is a whole number

###
percent error

value calculated by subtracting the experimental value from the accepted value, diving the difference by the accepted value, and then multiplying by 100

###
directly proportional

two quantities that give a constant value when one is divided by the other

###
inversely proportional

two quantities that have a constant mathematical product

###
theory

broad generalization that explains a body of facts or phenomena

###
hypothesis

testable statement

###
SI Units

measurement system accepted worldwide

###
scientific method

logical approach to solving problems by observing and collecting data, formulating hypotheses, testing hypotheses, and formulating theories that are supported by data

### Please allow access to your computer’s microphone to use Voice Recording.

## We can’t access your microphone!

### Click the icon above to update your browser permissions and try again

Example:

### Reload the page to try again!

Reload

## Press Cmd-0 to reset your zoom

## Press Ctrl-0 to reset your zoom

### It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

## Your microphone is muted

### For help fixing this issue, see this FAQ.