ECU CHEM 1120 Final Exam Study Guide | Chemistry Review, Key Concepts &
Practice Questions
physical change - ANS ✔✔rearranges molecules, but doesn't alter their internal structures (ex:
boiling water)
chemical change - ANS ✔✔any change that results in the formation of new chemical substances
(ex: rust)
pure substance - ANS ✔✔contains only one kind of atom or molecule (ex: NaCl) (ex: H₂O)
mixture - ANS ✔✔contains any number of different compounds, molecules or elements (ex:salt
water) (also heterogeneous and homogeneous)
Sugar contains three elements: C, H, and O. Can it still be a pure susbtance? - ANS ✔✔yes
because a pure substance are elements or compounds
where are metals on the periodic table? - ANS ✔✔on the left side of the line
where are nonmetals on the periodic table? - ANS ✔✔on the right side of the line
where are metalloids on the periodic table? - ANS ✔✔bordering the line (B, Si, Ge, As, Sb, Te,
Po)
where are the alkali metals? - ANS ✔✔first group(column) minus H
where are the alkaline earth metals? - ANS ✔✔2nd group
, where are the halogens? - ANS ✔✔7th group
where are the noble gases? - ANS ✔✔8th group(far right)
rules for sig figs: - ANS ✔✔1. any non-zero # is significant
2. zeroes at the beginning are never significant.
3. zeroes at the end are significant if the # has a a decimal
4. if a zero is in between two non-zero #s then it is included in the number of sig figs
KHDBDCMunp - ANS ✔✔kilo, hecto, deka, base, deci, centi, milli, micro(u)
formula for F° to C° - ANS ✔✔°C(9/5) +32=°F
electron charge - ANS ✔✔-1
proton charge - ANS ✔✔+1
neutron charge - ANS ✔✔0
what does amu stand for? - ANS ✔✔atomic mass unit
what does Z stand for? - ANS ✔✔atomic number of an element
what does A stand for? - ANS ✔✔mass number(protons+neutrons)
electron configuration - ANS ✔✔
Practice Questions
physical change - ANS ✔✔rearranges molecules, but doesn't alter their internal structures (ex:
boiling water)
chemical change - ANS ✔✔any change that results in the formation of new chemical substances
(ex: rust)
pure substance - ANS ✔✔contains only one kind of atom or molecule (ex: NaCl) (ex: H₂O)
mixture - ANS ✔✔contains any number of different compounds, molecules or elements (ex:salt
water) (also heterogeneous and homogeneous)
Sugar contains three elements: C, H, and O. Can it still be a pure susbtance? - ANS ✔✔yes
because a pure substance are elements or compounds
where are metals on the periodic table? - ANS ✔✔on the left side of the line
where are nonmetals on the periodic table? - ANS ✔✔on the right side of the line
where are metalloids on the periodic table? - ANS ✔✔bordering the line (B, Si, Ge, As, Sb, Te,
Po)
where are the alkali metals? - ANS ✔✔first group(column) minus H
where are the alkaline earth metals? - ANS ✔✔2nd group
, where are the halogens? - ANS ✔✔7th group
where are the noble gases? - ANS ✔✔8th group(far right)
rules for sig figs: - ANS ✔✔1. any non-zero # is significant
2. zeroes at the beginning are never significant.
3. zeroes at the end are significant if the # has a a decimal
4. if a zero is in between two non-zero #s then it is included in the number of sig figs
KHDBDCMunp - ANS ✔✔kilo, hecto, deka, base, deci, centi, milli, micro(u)
formula for F° to C° - ANS ✔✔°C(9/5) +32=°F
electron charge - ANS ✔✔-1
proton charge - ANS ✔✔+1
neutron charge - ANS ✔✔0
what does amu stand for? - ANS ✔✔atomic mass unit
what does Z stand for? - ANS ✔✔atomic number of an element
what does A stand for? - ANS ✔✔mass number(protons+neutrons)
electron configuration - ANS ✔✔
