CHEM 103 GENERAL CHEMISTRY ACTUAL EXAM TEST PAPER FULL QUESTIONS CORRECT RESPONSES

CHEM 103 GENERAL CHEMISTRY ACTUAL EXAM TEST PAPER FULL QUESTIONS
CORRECT RESPONSES
CHEM 103 General Chemistry Final TEST Script
2026/2027 Questions and Answers Verified Solutions
Latest Update

Question:
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.



Question:
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.



Question:
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.



Question:
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.



Question:
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



Question:
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.



Question:
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.



Question:

, John Dalton(English 1766-1844).

Answer:
-Father of modern Atomic Theory based on experimental evidence with gases



Question:
Dalton Atomic Particulate Model Of Matter.

Answer:
-All matter is made up of tiny particles called atoms. Unique types of atoms are called elements.
Molecules are collections of bonded atoms. Compound is general term that includes molecules,
atoms and ions (atoms not having normal number electrons). Compounds have a fixed ratio of
atoms. Chemical reactions do not create or destroy atoms. Chemical reactions can create or destroy
compounds.



Question:
Chemical View of the Atom.

Answer:
-Nucleus is the center containing protons (+) and neutrons (o). Electrons (-) are on the outside.
Atomic number = number of protons, which defines element. Atomic mass = mass of protons and
mass of neutrons. Number of electrons = number of protons in neutral atom. Neutron mass = proton
+ electron.



Question:
Elements.

Answer:
-Elements are pure substances made up of homoatomic molecules or individual atoms of the same
kind. Examples are oxygen gas made up of homoatomic molecules, O2, and copper metal made up
of individual copper atoms.



Question:
Compounds.