CHEM 103 LAB 2 CHEMICAL REACTION
PRACTICE ASSESSMENT 2026
COMPREHENSIVE SCRIPT QUESTIONS AND
SOLUTIONS
◉ Matter Answer: Matter is anything that has mass, occupies space
and is made-up of atoms or parts of atoms.
◉ Mass Answer: -Mass is a measure of the amount of matter in an
object.
-Mass is independent of the location of an object.
-An object on the earth has the same mass as the same object on the
moon, but not same weight.
◉ Weight Answer: -Weight is a measure of gravitational force acting
on object.
-Weight depends on the location of an object.
-Force = Mass * Acceleration, F = ma, Wt = m(gravity).
-An object weighing 1.0 lb on earth, weighs about 0.17 lb on the
moon. Mass of object is constant. Moon has 1/6 gravity of earth,
which reduces apparent weight of object.
,◉ Physical Properties of Matter Answer: -Physical properties can be
observed or measured without changing the composition of the
matter being observed.
Examples of physical properties are: color, shape and mass, and all
changes of state like gas to a liquid.
◉ Chemical Properties of Matter Answer: -Chemical properties can
be observed or measured only when the composition of matter is
changed.
Examples of chemical properties are flammability and the ability to
react (e.g. when vinegar and baking soda are mixed). Atoms must
change partners.
◉ Physical changes of Matter Answer: -Physical changes are
reversible.
-Physical changes take place without a change in composition.
Atoms are not changing partners.
-Nothing new is being created.
Examples of physical changes are freezing, melting, or evaporation
of a substance (e.g. water). H2O(s) → H2O(l), ice → water.
Separation of compounds is a physical change.
ex/ separating iron filing from sand is a chemical reaction
, ◉ Chemical Changes of matter Answer: -Chemical changes are not
always reversible.
-Chemical changes are always accompanied by a change in
composition. Atoms are changing partners.
-New types of matter are being created, O2 + 2H2 → 2H2O
Examples of chemical changes are the burning of paper and the
fizzing of a mixture of vinegar and baking soda.
◉ Democritus (Greek, 460-370 BC) Answer: First person whose
writings suggested,
-based only on logic, that atoms where the
basis of matter.
-Atoms comes from the word 'atomos'
means "no cut".
-Democritus said there were different types of atoms.
-Matter was made of atoms and spaces, call the void.
-Aristotle, (384-322 BC) argued against the possibility of a void and
the atomic theory was lost for nearly 1500 years.
◉ John Dalton(English 1766-1844) Answer: -Father of modern
Atomic Theory
based on experimental evidence with gases
PRACTICE ASSESSMENT 2026
COMPREHENSIVE SCRIPT QUESTIONS AND
SOLUTIONS
◉ Matter Answer: Matter is anything that has mass, occupies space
and is made-up of atoms or parts of atoms.
◉ Mass Answer: -Mass is a measure of the amount of matter in an
object.
-Mass is independent of the location of an object.
-An object on the earth has the same mass as the same object on the
moon, but not same weight.
◉ Weight Answer: -Weight is a measure of gravitational force acting
on object.
-Weight depends on the location of an object.
-Force = Mass * Acceleration, F = ma, Wt = m(gravity).
-An object weighing 1.0 lb on earth, weighs about 0.17 lb on the
moon. Mass of object is constant. Moon has 1/6 gravity of earth,
which reduces apparent weight of object.
,◉ Physical Properties of Matter Answer: -Physical properties can be
observed or measured without changing the composition of the
matter being observed.
Examples of physical properties are: color, shape and mass, and all
changes of state like gas to a liquid.
◉ Chemical Properties of Matter Answer: -Chemical properties can
be observed or measured only when the composition of matter is
changed.
Examples of chemical properties are flammability and the ability to
react (e.g. when vinegar and baking soda are mixed). Atoms must
change partners.
◉ Physical changes of Matter Answer: -Physical changes are
reversible.
-Physical changes take place without a change in composition.
Atoms are not changing partners.
-Nothing new is being created.
Examples of physical changes are freezing, melting, or evaporation
of a substance (e.g. water). H2O(s) → H2O(l), ice → water.
Separation of compounds is a physical change.
ex/ separating iron filing from sand is a chemical reaction
, ◉ Chemical Changes of matter Answer: -Chemical changes are not
always reversible.
-Chemical changes are always accompanied by a change in
composition. Atoms are changing partners.
-New types of matter are being created, O2 + 2H2 → 2H2O
Examples of chemical changes are the burning of paper and the
fizzing of a mixture of vinegar and baking soda.
◉ Democritus (Greek, 460-370 BC) Answer: First person whose
writings suggested,
-based only on logic, that atoms where the
basis of matter.
-Atoms comes from the word 'atomos'
means "no cut".
-Democritus said there were different types of atoms.
-Matter was made of atoms and spaces, call the void.
-Aristotle, (384-322 BC) argued against the possibility of a void and
the atomic theory was lost for nearly 1500 years.
◉ John Dalton(English 1766-1844) Answer: -Father of modern
Atomic Theory
based on experimental evidence with gases
