CHEM 121 UNR FINAL QUESTIONS &
ANSWERS(RATED A+)
Homogenous Mixture - ANSWERmixture same throughout EX) Air
Heterogenous Mixture - ANSWERMixture different throughout EX) Smoke
Density= - ANSWERMass(g)/Volume(l)
Filtration - ANSWERUsed to sperate a hetro mixture
Distillation - ANSWERfrom Homo Mixture, Use boiling points
Kilo - ANSWER1x10^3
Centi - ANSWER1x10^-2
Mili - ANSWER1x10^-3
Micro - ANSWER1x10^-6
Nano - ANSWER1x10^9
Pico - ANSWER1x10^-12
Add or Subtract = - ANSWERnumber of decimal places
multiply or divide = - ANSWERnumber of sig figs
Never a sig fig - ANSWER0's at the beginning of a number
0's between 2 sig fig - ANSWERAre significant
all non zero - ANSWERare significant
0's at the end, when decimal place is present - ANSWERare significant
Law of conservation of mass - ANSWERmatter cannot be created or destroyed
law of constant composition - ANSWERrelative proportions of mass are the same
Ernest Ruthford's Experiment - ANSWERshot particles at a relevance: discovered
positively charged particles, the Nucleus
Atomic Number - ANSWERTop number on Element, Number of Protons
Number Below Element Symbol - ANSWERAtomic Weight
, Isotope - ANSWERsame number of protons different number or neutrons
Ion - ANSWERsame number of protons different number of electrons
Group 1 - ANSWERalkaline metals
group 2 - ANSWERalkali earth metals
group 16 - ANSWERchalogens
group 17 - ANSWERhalogens
group 18 - ANSWERnoble gases
groups 3-15 - ANSWERtransfer metals
Fractional Abundance - ANSWER[(atomic weight)(% decimal from)] + [""]
common ions - ANSWERNO3-
SO4-
ClO4-
ClO3-
Types of Nomenclature Compounds - ANSWERIonic (metal/Nonmetal)
Molecular (nonmetal/nonmetal)
ate acid - ANSWER=____ic acid
transition metals - ANSWERname using roman numerals
Combination Rxn - ANSWERA+B--->AB
Combustion Rxn - ANSWERA+B---->CO2+H2O
Decomposition Rxn - ANSWERAB-->A+B
-ite nomenclature - ANSWERcompound with least amount of oxygen
-ate nomenclature - ANSWERmost amount of oxygen
mono - molecular - ANSWER1
di - molecular - ANSWER2
tri - molecular - ANSWER3
tetra -molecular - ANSWER4
Penta - molecular - ANSWER5
ANSWERS(RATED A+)
Homogenous Mixture - ANSWERmixture same throughout EX) Air
Heterogenous Mixture - ANSWERMixture different throughout EX) Smoke
Density= - ANSWERMass(g)/Volume(l)
Filtration - ANSWERUsed to sperate a hetro mixture
Distillation - ANSWERfrom Homo Mixture, Use boiling points
Kilo - ANSWER1x10^3
Centi - ANSWER1x10^-2
Mili - ANSWER1x10^-3
Micro - ANSWER1x10^-6
Nano - ANSWER1x10^9
Pico - ANSWER1x10^-12
Add or Subtract = - ANSWERnumber of decimal places
multiply or divide = - ANSWERnumber of sig figs
Never a sig fig - ANSWER0's at the beginning of a number
0's between 2 sig fig - ANSWERAre significant
all non zero - ANSWERare significant
0's at the end, when decimal place is present - ANSWERare significant
Law of conservation of mass - ANSWERmatter cannot be created or destroyed
law of constant composition - ANSWERrelative proportions of mass are the same
Ernest Ruthford's Experiment - ANSWERshot particles at a relevance: discovered
positively charged particles, the Nucleus
Atomic Number - ANSWERTop number on Element, Number of Protons
Number Below Element Symbol - ANSWERAtomic Weight
, Isotope - ANSWERsame number of protons different number or neutrons
Ion - ANSWERsame number of protons different number of electrons
Group 1 - ANSWERalkaline metals
group 2 - ANSWERalkali earth metals
group 16 - ANSWERchalogens
group 17 - ANSWERhalogens
group 18 - ANSWERnoble gases
groups 3-15 - ANSWERtransfer metals
Fractional Abundance - ANSWER[(atomic weight)(% decimal from)] + [""]
common ions - ANSWERNO3-
SO4-
ClO4-
ClO3-
Types of Nomenclature Compounds - ANSWERIonic (metal/Nonmetal)
Molecular (nonmetal/nonmetal)
ate acid - ANSWER=____ic acid
transition metals - ANSWERname using roman numerals
Combination Rxn - ANSWERA+B--->AB
Combustion Rxn - ANSWERA+B---->CO2+H2O
Decomposition Rxn - ANSWERAB-->A+B
-ite nomenclature - ANSWERcompound with least amount of oxygen
-ate nomenclature - ANSWERmost amount of oxygen
mono - molecular - ANSWER1
di - molecular - ANSWER2
tri - molecular - ANSWER3
tetra -molecular - ANSWER4
Penta - molecular - ANSWER5
