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Chem 103 Exam 1 Questions & answers
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Chem 103 Exam 1 Questions & answers
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Chem 103 Exam 1% accuracy - correct answer-actual/theory x 100
% error - correct answer-accepted-experimental/accepted x 100
1 L - correct answer-1000 mL
1 mL - correct answer-0.001 L
1 mol - correct answer-6.022x10^23
As the atomic number increases in group a - correct answer-the chemical reaction becomes
more vigorous
Atomic mass unit - correct answer-used to express relative masses of atoms
12
6C
relative mass of 12 u
Atoms get bigger as - correct answer-you go down the group
-larger cations release (donate) electrons more easily than smaller cations.
Atoms get smaller - correct answer-as you go across the period left to right
Ball and stick model - correct answer-Each element is represented by a different colored ball
Carbon - correct answer-Black
Centi - correct answer-c
1/100 x basic unit
10^-2 x basic unit
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.
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.
Chemical View of the Atom - correct 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.
Compound Formulas - correct answer-A compound formula consists of the symbols of the
elements found in the compound. Each elemental symbol represents one atom of the
element. If more than one atom is represented, a subscript following the elemental symbol is
used.
Compounds - correct answer--Compounds are pure substances that are made up of atoms
bonded to form heteroatomic molecules or individual (ions) of two or more different kinds of
atoms.
Examples: pure water made up of heteropolyatomic molecules and table salt made up of
sodium ions and chlorine ions. Technically, Ionic compounds are not molecules.
Dalton Atomic Particulate Model Of Matter - correct 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.
deci - correct answer-d
1/10 x basic unit
10^-1 x basic unit
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.
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