CHEM 121 FINAL EXAM | UPDATED QUESTIONS AND
ANSWERS UPDATED .Buy Quality Materials!
Homogenous Mixture
mixture same throughout EX) Air
Heterogenous Mixture
Mixture different throughout EX) Smoke
Density=
Mass(g)/Volume(l)
Filtration
Used to sperate a hetro mixture
Distillation
from Homo Mixture, Use boiling points
Kilo
1x10^3
Centi
1x10^-2
Mili
1x10^-3
Micro
1x10^-6
Nano
1x10^9
Pico
1x10^-12
Add or Subtract =
number of decimal places
multiply or divide =
number of sig figs
Never a sig fig
0's at the beginning of a number
0's between 2 sig fig
Are significant
all non zero
are significant
0's at the end, when decimal place is present
are significant
Law of conservation of mass
matter cannot be created or destroyed
law of constant composition
relative proportions of mass are the same
Ernest Ruthford's Experiment
shot particles at a relevance: discovered positively charged particles, the Nucleus
Atomic Number
, Top number on Element, Number of Protons
Number Below Element Symbol
Atomic Weight
Isotope
same number of protons different number or neutrons
Ion
same number of protons different number of electrons
Group 1
alkaline metals
group 2
alkali earth metals
group 16
chalogens
group 17
halogens
group 18
noble gases
groups 3-15
transfer metals
Fractional Abundance
[(atomic weight)(% decimal from)] + [""]
common ions
NO3-
SO4-
ClO4-
ClO3-
Types of Nomenclature Compounds
Ionic (metal/Nonmetal)
Molecular (nonmetal/nonmetal)
-ite nomenclature
compound with least amount of oxygen
-ate nomenclature
most amount of oxygen
mono - molecular
1
di - molecular
2
tri - molecular
3
tetra -molecular
4
Penta - molecular
5
hexa - molecular
6
hepta - molecular
ANSWERS UPDATED .Buy Quality Materials!
Homogenous Mixture
mixture same throughout EX) Air
Heterogenous Mixture
Mixture different throughout EX) Smoke
Density=
Mass(g)/Volume(l)
Filtration
Used to sperate a hetro mixture
Distillation
from Homo Mixture, Use boiling points
Kilo
1x10^3
Centi
1x10^-2
Mili
1x10^-3
Micro
1x10^-6
Nano
1x10^9
Pico
1x10^-12
Add or Subtract =
number of decimal places
multiply or divide =
number of sig figs
Never a sig fig
0's at the beginning of a number
0's between 2 sig fig
Are significant
all non zero
are significant
0's at the end, when decimal place is present
are significant
Law of conservation of mass
matter cannot be created or destroyed
law of constant composition
relative proportions of mass are the same
Ernest Ruthford's Experiment
shot particles at a relevance: discovered positively charged particles, the Nucleus
Atomic Number
, Top number on Element, Number of Protons
Number Below Element Symbol
Atomic Weight
Isotope
same number of protons different number or neutrons
Ion
same number of protons different number of electrons
Group 1
alkaline metals
group 2
alkali earth metals
group 16
chalogens
group 17
halogens
group 18
noble gases
groups 3-15
transfer metals
Fractional Abundance
[(atomic weight)(% decimal from)] + [""]
common ions
NO3-
SO4-
ClO4-
ClO3-
Types of Nomenclature Compounds
Ionic (metal/Nonmetal)
Molecular (nonmetal/nonmetal)
-ite nomenclature
compound with least amount of oxygen
-ate nomenclature
most amount of oxygen
mono - molecular
1
di - molecular
2
tri - molecular
3
tetra -molecular
4
Penta - molecular
5
hexa - molecular
6
hepta - molecular
