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Chem 103 Exam 1 Questions with Correct Answers.
Chem 103 Exam 1 Questions with Correct Answers.
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Chem 103 Exam 1 Questions with Correct AnswersWhat is chemistry? Correct 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 Correct Answer-Matter is anything that has mass, occupies space
and is made-up of atoms or parts of atoms.
Mass Correct 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 Correct 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 Correct 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 Correct 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 Correct 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 Correct 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) Correct 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) Correct Answer--Father of modern
Atomic Theory
based on experimental evidence with gases
Dalton Atomic Particulate Model Of Matter Correct Answer--All matter
is made up of tiny particles called atoms.
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