Chem 103 Exam 1 Exam Questions With Verified Answers.
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Course
Chem 103
Institution
Chem 103
Chem 103 Exam 1 Exam Questions With
Verified Answers.
What is chemistry? - answerChemistry 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 - answerMatter is anything th...
Chem 103 Exam 1 Exam Questions With
Verified Answers.
What is chemistry? - answer✔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 - 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
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