2025 Chem 103 Exam Practice Exam GRADED A 353 QUESTIONS AND ANSWERS
Matter - CORRECT ANSWER The physical material of the universe; it is anything
that has mass and occupies space.
property - CORRECT ANSWER any characteristic that allows us to recognize a
particular type of matter and to distinguish it from other types.
elements - CORRECT ANSWER over 100 varieties of matter that combines to form
everything in the world. Substances that can not be decomposed for any reason.
atoms - CORRECT ANSWER the infinitesimally small building block of matter.
molecules - CORRECT ANSWER two or more atoms joined together in specific
shapes.
states of matter - CORRECT ANSWER a sample of matter that is either a gas,
liquid, or solid.
liquid - CORRECT ANSWER a distinct volume dependence, yet has no specific
shape.
solid - CORRECT ANSWER definite shape and volume
gas - CORRECT ANSWER no fixed volume, and conforms in shape.
pure substances - CORRECT ANSWER matter that has distinct properties and and
structure that does not vary.
Compounds - CORRECT ANSWER substances composed of two or more
elements.
Mixtures - CORRECT ANSWER combinations of two or more substances, each
substance maintains its chemical identity.
law of constant composition - CORRECT ANSWER (law of definite proportions)
notes that elemental composition of a compound is always the same.
solutions - CORRECT ANSWER when substances disolve in water to form
homogeneous mixtures.
,physical properties - CORRECT ANSWER observation of substance withough
changing identity, composition (color, odor, density, melting point, ect)
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)
Matter - CORRECT ANSWER The physical material of the universe; it is anything
that has mass and occupies space.
property - CORRECT ANSWER any characteristic that allows us to recognize a
particular type of matter and to distinguish it from other types.
elements - CORRECT ANSWER over 100 varieties of matter that combines to form
everything in the world. Substances that can not be decomposed for any reason.
atoms - CORRECT ANSWER the infinitesimally small building block of matter.
molecules - CORRECT ANSWER two or more atoms joined together in specific
shapes.
states of matter - CORRECT ANSWER a sample of matter that is either a gas,
liquid, or solid.
liquid - CORRECT ANSWER a distinct volume dependence, yet has no specific
shape.
solid - CORRECT ANSWER definite shape and volume
gas - CORRECT ANSWER no fixed volume, and conforms in shape.
pure substances - CORRECT ANSWER matter that has distinct properties and and
structure that does not vary.
Compounds - CORRECT ANSWER substances composed of two or more
elements.
Mixtures - CORRECT ANSWER combinations of two or more substances, each
substance maintains its chemical identity.
law of constant composition - CORRECT ANSWER (law of definite proportions)
notes that elemental composition of a compound is always the same.
solutions - CORRECT ANSWER when substances disolve in water to form
homogeneous mixtures.
,physical properties - CORRECT ANSWER observation of substance withough
changing identity, composition (color, odor, density, melting point, ect)
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)
