Chemistry Flashcards
Kilometer
Km
Seconds
S
Liter
L
Milligram
Mg
Ceniseacand
Cs
Decigram
Dg
Milliliter
ML
Gram
G
Millisecond
Ms
Centiliter
CL
What is quantitative data
Always contains a number
Qualitative
Anything relates to the senses
No numbers
Metric units
Always consist of a base unit and a prefix’s
Base unit
Indicates the type of mesument
Metric units
Prefix’s inducted the magnitude or size of the measurement
Prifxs change
Each prefix’s changes the size of a measurement by a power of 10
Units can be converted using the
Ladder method
To convert to a smaller unit
Move the decimal point to the right or multiply
To convert to a larger unit
Move the decmail point to the left or divide
Sinficant figures
Are determined by the measuring device you are using
The number of all known digits in a reported measurement plus one estimated value.
The more sinficant figures in a measurement the more accurate the device.
There are many rules used in the seince lab. We will focus on a couple guidelines
Sinfigant figures
Always estamte one decimal place further
In calculations the final answer can never have more sig figs then the starting number
Accuracy
How close the data is to the desired goal or true value
Precision
How consistent is the data
How close are the data points to another
What is the percent error equation
Accepted - measured
Divided by accepted
After that times 100
Range and range two
Range= highest - lowest /2
The closest to zero the more prisise the data
The order of units biggest to smallest
Millimeter, decimeter, meter, kilometer
Convert 100cm in to m
1m
If there is a comma in a number when counting sig figs
only count the numbers
