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Glossary of Chem Honors Chapter 2

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Scientific method
A logical approach to solving problems by observing & collecting data, formulating hyptheses, testing hypotheses, and formulating theories supported by the data
Observing
use of senses to observe info
System
A specific portion of matter in a given region of space that has been selected for study during an experiment of observation
Hypotheses
testable statement
Model
An Explanation of how phenomena occur, how data or events are related
theory
A broad generalization that explains a body of facts or phenomena
Quantity
Something that has magnitude, size, or amount
SI
le syste'me international d'unte's
Weight
measure of gravitational pull
Derived units
Combination of SI units
Liter
1000cm^3
Density
M/V
Length
l, meter, m, light interval
mass
m, kilo, kg
time
t, second, s
temperature
t, kelvin, K
Amount of substance
n, mole, mol
Electric current
I, ampere, A
Luminous intensity
Iv, candela, cd
Tera
T 10^12 (Trillion)
Giga
G 10^9 (Billion)
Mega
10^6 (M million)
Kilo
k 10^3 Thousand
Hecto
h 10^2 Hundred
Deka
da 10
Deci
d 10^-1
Centi
c 10^-2
Micro
,u 10^-6
Nano
n 10^-9
Pico
p^-12
Femto
f 10^-15
Atto
a 10^-18
Accuracy
closeness of measurements to the correct or accepted value of the quantity measured
Precision
closeness of a set of measurements of the same quantity of measurements made in the same way
Percent error
(Value accepted- value experimental)*100
---------------------
Value accepted
Significant figures
All digits known with certainty and 1 final, which is uncertain or estimated
Adding+Subtracting
Answer must have same number of digits to the right of the decimal as there are in the measurment having the fewest digits to the right of the decimal point
Dividing+Multiplying
Fewest number sig figures
directly prop
y
- = k
x
inversely prop
xy=k

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