chem final unit 1 Flashcards
sig figs rules
- Trailing zeros (zeros after nonzero digits) are significant if there is a decimal point 50.0 has 3
- Trailing zeros without a decimal point are NOT significant. 500 has 1
- Leading zeros (zeros before nonzero digits) are NOT significant. even with decimal point 0.0025 has 2
1001 - how many sig figs
4
1000 - how many sig figs
1
0.001 - how many sig figs
1
100.0 - how many sig figs
4
0.100 - how many sig figs
3
pure substance
a substance that contains 1 type particle (atom or molecule)
percent error equation
measured - actaul /actual x100
precision error equation
range/2 /average x 100 range is highest value - lowest value
KHDBDCM
k=1000 h=100 d=10 b= base units d= 0.1 c= 0.01 m= 0.001
what is matter
its anything that takes up space, its composed of particles Mass (g) is the measure of matter voluem is the liquid form (mL)
relationship with mdv
m/d|v
physical properties
density MP BP and soublity
chemical properties
how something reacts to another thing
mixture
a substance that contains more than one type of particle (atom or molecule)
atom
one element
molecule
2 or more of the same atoms bonded
compound
2 or more different atoms bonded s
si unit for lenght
meter (m)
si unit for time
second s
si unit for mass
kilogram kg
si unit for volume
cubic meters (m³)
si unit for temp
kelvin K K=°C+273
adding with sig figs
use the number with the least decimal places to guide your answer
muliplying with sig figs
use the number with the lowest sig figs to guide your anser
