2025 Chem 103 Exam Practice Exam GRADED A 353 QUESTIONS AND ANSWERS
Chemical properties - CORRECT ANSWER the way a substance may
change/react. (flammability)
intensive properties - CORRECT ANSWER properties such as as a substance's
melting point.
extensive properties - CORRECT ANSWER amount of a sample, such as mass
and volume.
physical change - CORRECT ANSWER a substance changes its appearance but
NOT its composition.
change of state - CORRECT ANSWER physical changes, such as a substance
changing its state of matter
chemical change - CORRECT ANSWER chemical reaction, substance is
transformed into a chemically different substance.
metric system - CORRECT ANSWER the units used for scientific measurements.
SI units - CORRECT ANSWER preferred units in the metric system
mass - CORRECT ANSWER measure of the amount of materical in an object.
Celsius scale - CORRECT ANSWER preferred use of measure for temperature. 0
degrees C is equivalent to 32 degrees Fahrenheit
Kelvin scale - CORRECT ANSWER the SI temperature scale, contains absolute
zero.
Precision - CORRECT ANSWER a measure of how closely individual
measurements agree with one another
Accuracy - CORRECT ANSWER how closely individual measurements agree with
its correct of true value.
significant figures - CORRECT ANSWER all digits of measured quantity.
,dimensional analysis - CORRECT ANSWER units being manipulated so that they
cancel out.
conversion factor - CORRECT ANSWER finding the fraction where units are
equivalent in an attempt to cancel.
atoms - CORRECT ANSWER the building blocks of life
subatomic particles - CORRECT ANSWER the particles that the atom is composed
of.
cathode rays - CORRECT ANSWER radiation that originates from negative
electrodes and travels to positive electrodes. Gives off a light when around certain
materials.
radioactivity - CORRECT ANSWER spontaneous emission of radiation.
nuclear model - CORRECT ANSWER created by Rutherford, a model in which
most of the mass of atoms(gold specifically) and all of its positive charge reside in
tiny,dense regions (the nucleus)
nucleus - CORRECT ANSWER small dense region where positive charges reside.
proton - CORRECT ANSWER Positive charge (+1); mass 1.0073
electron - CORRECT ANSWER Negative charge (-1); mass 5.486x10^-4
Neutrons - CORRECT ANSWER neutral(none); mass 1.0087
electronic charge - CORRECT ANSWER the quantity 1.602x10^-19 Coulombs
atomic mass unit - CORRECT ANSWER the mass of subatomic particles in easier
terms
angstrom - CORRECT ANSWER 1 angstrom=1x10^-10
atomic number - CORRECT ANSWER the number of protons in an atom of any
particular element
mass number - CORRECT ANSWER the number of protons and neutrons in the
atom
, isotopes - CORRECT ANSWER atoms with identical atomic numbers but contain
different mass numbers (same protons, differnt neutrons)
atomic weight - CORRECT ANSWER the average atomic mass by using the
masses of an elements isotopes and their relative abundances.
periodic table - CORRECT ANSWER the arrangement of elements in order of
increasing atomic numbers, with elements having similar properties placed in vertical
columns.
periods - CORRECT ANSWER horizontal rows of the periodic table
groups - CORRECT ANSWER vertical columns on the periodic table
metallic elements - CORRECT ANSWER metals, found in left and middle of table
(excluding H). Show characteristics of luster, conductivity, and solidity (minus Hg) at
room temp.
Nonmetals elements - CORRECT ANSWER nonmetals, line that runs from B to At.
Gaseous, solid or 1 is liquid at room temp. Differ in appearance and characteristics from
metals.
metalloids - CORRECT ANSWER elements that lie along the line that separates
metals from nonmetals and contain properties of both.
Chemical formulas - CORRECT ANSWER written composition of chemical
molecules
diatomic molecules - CORRECT ANSWER molecule made up of two atoms.
molecular compounds - CORRECT ANSWER compounds composed of molecules
that contain more than one type of atom.
molecular formulas - CORRECT ANSWER chemical formulas that indicate the
actual numbers of atoms in a molecule (H2,H2O,CO,CH4,ect)
emperical formulas - CORRECT ANSWER chemical formulas that give only the
relative number of atoms of each type in a molecule.
ion - CORRECT ANSWER electrons that are removed from or added to an atom,
changing the charge.
cation - CORRECT ANSWER an ion with a positive charge
Chemical properties - CORRECT ANSWER the way a substance may
change/react. (flammability)
intensive properties - CORRECT ANSWER properties such as as a substance's
melting point.
extensive properties - CORRECT ANSWER amount of a sample, such as mass
and volume.
physical change - CORRECT ANSWER a substance changes its appearance but
NOT its composition.
change of state - CORRECT ANSWER physical changes, such as a substance
changing its state of matter
chemical change - CORRECT ANSWER chemical reaction, substance is
transformed into a chemically different substance.
metric system - CORRECT ANSWER the units used for scientific measurements.
SI units - CORRECT ANSWER preferred units in the metric system
mass - CORRECT ANSWER measure of the amount of materical in an object.
Celsius scale - CORRECT ANSWER preferred use of measure for temperature. 0
degrees C is equivalent to 32 degrees Fahrenheit
Kelvin scale - CORRECT ANSWER the SI temperature scale, contains absolute
zero.
Precision - CORRECT ANSWER a measure of how closely individual
measurements agree with one another
Accuracy - CORRECT ANSWER how closely individual measurements agree with
its correct of true value.
significant figures - CORRECT ANSWER all digits of measured quantity.
,dimensional analysis - CORRECT ANSWER units being manipulated so that they
cancel out.
conversion factor - CORRECT ANSWER finding the fraction where units are
equivalent in an attempt to cancel.
atoms - CORRECT ANSWER the building blocks of life
subatomic particles - CORRECT ANSWER the particles that the atom is composed
of.
cathode rays - CORRECT ANSWER radiation that originates from negative
electrodes and travels to positive electrodes. Gives off a light when around certain
materials.
radioactivity - CORRECT ANSWER spontaneous emission of radiation.
nuclear model - CORRECT ANSWER created by Rutherford, a model in which
most of the mass of atoms(gold specifically) and all of its positive charge reside in
tiny,dense regions (the nucleus)
nucleus - CORRECT ANSWER small dense region where positive charges reside.
proton - CORRECT ANSWER Positive charge (+1); mass 1.0073
electron - CORRECT ANSWER Negative charge (-1); mass 5.486x10^-4
Neutrons - CORRECT ANSWER neutral(none); mass 1.0087
electronic charge - CORRECT ANSWER the quantity 1.602x10^-19 Coulombs
atomic mass unit - CORRECT ANSWER the mass of subatomic particles in easier
terms
angstrom - CORRECT ANSWER 1 angstrom=1x10^-10
atomic number - CORRECT ANSWER the number of protons in an atom of any
particular element
mass number - CORRECT ANSWER the number of protons and neutrons in the
atom
, isotopes - CORRECT ANSWER atoms with identical atomic numbers but contain
different mass numbers (same protons, differnt neutrons)
atomic weight - CORRECT ANSWER the average atomic mass by using the
masses of an elements isotopes and their relative abundances.
periodic table - CORRECT ANSWER the arrangement of elements in order of
increasing atomic numbers, with elements having similar properties placed in vertical
columns.
periods - CORRECT ANSWER horizontal rows of the periodic table
groups - CORRECT ANSWER vertical columns on the periodic table
metallic elements - CORRECT ANSWER metals, found in left and middle of table
(excluding H). Show characteristics of luster, conductivity, and solidity (minus Hg) at
room temp.
Nonmetals elements - CORRECT ANSWER nonmetals, line that runs from B to At.
Gaseous, solid or 1 is liquid at room temp. Differ in appearance and characteristics from
metals.
metalloids - CORRECT ANSWER elements that lie along the line that separates
metals from nonmetals and contain properties of both.
Chemical formulas - CORRECT ANSWER written composition of chemical
molecules
diatomic molecules - CORRECT ANSWER molecule made up of two atoms.
molecular compounds - CORRECT ANSWER compounds composed of molecules
that contain more than one type of atom.
molecular formulas - CORRECT ANSWER chemical formulas that indicate the
actual numbers of atoms in a molecule (H2,H2O,CO,CH4,ect)
emperical formulas - CORRECT ANSWER chemical formulas that give only the
relative number of atoms of each type in a molecule.
ion - CORRECT ANSWER electrons that are removed from or added to an atom,
changing the charge.
cation - CORRECT ANSWER an ion with a positive charge
