NDSU Chem 121 Exam 1 Questions and Answers
giga
G, 10^12
mega
M, 10^6
kilo
k, 10^3
deci
d, 10^-1
centi
c, 10^-2
milli
m, 10^-3
micro
μ, 10^-6
nano
n, 10^-9
pico
p, 10^-12
femto
f, 10^-15
Fahrenheit to Celsius
(9/5) x...
Dalton's Atomic Theory - answer 1. Elements are composed of atoms.
2. All atoms of an element are identical and are different from atoms of all other
elements.
3. Compounds are composed of atoms from multiple elements combined in a whole
number ration. (Law of definite proportion)
4. A chemical reaction doesn't result in creation/destruction of atoms. (law of
conservation of mass)
Law of Definite Proportions - answer Different samples of the same compound
always contain the elements in the same proportion by mass (Proust)
, Law of Conservation of Mass - answer Matter can be neither created nor destroyed
(Lavoisier)
Chemistry - answer Study of matter and how the properties of matter are related to
composition
Matter - answer Anything that has mass and occupies space
Mass - answer measure of amount of matter (independent of gravitational force)
Weight - answer force of attraction by the earth
W= m x g (mass times gravity)
Fundamental Forces of Nature - answer 1. Gravitational - weakest but longest range
2. Electromagnetic
3. Strong & Weak forces of the nucleus - strongest but shortest range
2 Types of Experiments - answer 1. Support hypothesis
2. Disprove ideas/explanation (preferred)
Law - answer verbal statement or mathematical equation that summarizes
observations and experiments
Hypothesis - answer a tentative, initial, explanation of the observations
Theory - answer a hypothesis that repeatedly withstands the test of experiments and
has overwhelming supportive evidence
Physical properties of matter - answer Measured without changing the
identity/composition of the substance.
Ex. melting/boiling points, color, density, mass
Chemical properties of matter - answer Describe the way a substance reacts to form
other substances. Changes composition/identity!!
SI Base Units:
Length
Mass
Time
Temperature
Amount of Substance - answer meter
kilogram
second
kelvin
mole
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