CHEM 103 EXAM 1 EXAM WITH
CORRECT QUESTIONS AND ANSWERS
2025
What is chemistry? - CORRECT-ANSWERS>>>>>Chemistry is the study of the physical and
compositional changes of matter.
Chemistry is called the Central Science.
Many health related areas of study are based on Chemistry.
Matter - CORRECT-ANSWERS>>>>>Matter is anything that has mass, occupies space and is
made-up of atoms or parts of atoms.
Mass - CORRECT-ANSWERS>>>>>-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 - CORRECT-ANSWERS>>>>>-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 - CORRECT-ANSWERS>>>>>-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 - CORRECT-ANSWERS>>>>>-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 - CORRECT-ANSWERS>>>>>-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 - CORRECT-ANSWERS>>>>>-Chemical changes are not always
reversible.
CORRECT QUESTIONS AND ANSWERS
2025
What is chemistry? - CORRECT-ANSWERS>>>>>Chemistry is the study of the physical and
compositional changes of matter.
Chemistry is called the Central Science.
Many health related areas of study are based on Chemistry.
Matter - CORRECT-ANSWERS>>>>>Matter is anything that has mass, occupies space and is
made-up of atoms or parts of atoms.
Mass - CORRECT-ANSWERS>>>>>-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 - CORRECT-ANSWERS>>>>>-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 - CORRECT-ANSWERS>>>>>-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 - CORRECT-ANSWERS>>>>>-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 - CORRECT-ANSWERS>>>>>-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 - CORRECT-ANSWERS>>>>>-Chemical changes are not always
reversible.
