PORTAGE LEARNING CHEM 103 FINAL EXAM /
CHEM 105 FINAL EXAM PORTAGE LEARNING
LATEST ACTUAL EXAM QUESTIONS AND
CORRECT DETAILED ANSWERS (CORRECT
VERIFIED ANSWERS) NEWEST UPDATED
VERSION |ALREADY GRADED A+
Beginning of SI Units
Units can be length (meters), volume (liters), and mass (grams) - ANSWER: Yay
Prefixes (Large to small)
Mega - ANSWER: M
1 X 10^6 m = 1 Mm
One million meters in one Megameter
Kilo - ANSWER: k
1 x 10^3 m = 1 Km
1000 meters in 1 Kilometer
centi - ANSWER: c
10^2 cm = 1 m
100 centimeters in 1 meter
milli - ANSWER: m
10^3 mm = 1 m
1000 millimeters in 1 meter
micro - ANSWER: u
10^6 um = 1 m
1 million micrometers in 1 meter
nano - ANSWER: n
10^9 nm = 1 m
1 Billion nanometers in 1 meter
Angstrom - ANSWER: A
10^10 A = 1 m
10 billion A in 1 meter
pico
End of Si Units - ANSWER: p
10^12 pm = 1 m
,1 trillion picometers in 1 meter
What is the relationship between melting point and freezing point? - ANSWER: They
occur at the same temperature for a substance.
Why are solids and liquids denser than gases? - ANSWER: Particles are in direct
contact, more per unit of volume (mass).
What happens to the average speed of atoms as the temperature of a substance
increases? - ANSWER: The average speed of atoms increases.
Which remains solid at higher temperatures: argon or neon? - ANSWER: Argon
remains solid at higher temperatures than neon.
Gas phase - ANSWER: Molecules far apart and move a lot.
Liquid phase - ANSWER: Molecules in close contact and slide past each other.
Solid phase - ANSWER: Molecules rigidly connected and vibrate.
Chemical changes - ANSWER: Bonds breaking, combustion, new substances form.
Produces new kinds of matter
Physical changes - ANSWER: Transitions between s/l/g, no breaking of bonds,
density, conductivity, solubility, color, hardness, melting and boiling points
Symbol
Atomic mass
Atomic number - ANSWER: Symbol: C
Atomic Mass: 12 (protons + neutrons)
Atomic Number: 6 (protons)
In neutral atoms, p+=e-
(carbon has 6 electrons when neutral)
Why is writing a 6 and C redundant? - ANSWER: Elements are defined by their
atomic numbers. # of protons cannot change without changing the elements identity.
All carbon isotopes will all have 6 protons. So an atom with ^ protons will always be
Carbon. They mean the same thing.
Rutheford's Experiment/Gold foil experiment - ANSWER: Prediction:
-most particles pass through
-small deflections
No real interaction should happen
Observation:
-Most particles passed through undeflected
-Some particles deflected at large angles
-Some particles reflected back to source
Rutheford's experiment conclusion? - ANSWER: Most of an atom is empty space,
with a large, dense, positive mass in the center
, What is an element? - ANSWER: Pure chemical substance consisting of one type of
atom.
Which element is most abundant in the earth's crust? - ANSWER: Oxygen.
What is an atom? - ANSWER: Smallest particle of an element that retains the
characteristic properties of that element.
What is a compound? - ANSWER: Pure chemical substance consisting of two or
more different chemical elements.
What is the unique characteristic of chemical compounds? - ANSWER: They have a
unique and defined chemical structure. (H2O, always two hydrogen with one oxygen)
How are atoms arranged in compounds? - ANSWER: They consist of a fixed ratio of
atoms that are held together in a defined spatial arrangement by chemical bonds.
What type of bonds hold together molecular compounds? - ANSWER: Covalent
bonds.
What type of bonds hold together salts? - ANSWER: Ionic bonds.
What is a molecule? - ANSWER: Electrically neutral group of at least two atoms in a
definite arrangement that retains the composition and chemical characteristics of a
compound.
What are metals? - ANSWER: Elements that are shiny, malleable, and good
conductors of heat and electricity.
What are nonmetals? - ANSWER: Elements that appear dull and are poor conductors
of heat and electricity.
What are metalloids? - ANSWER: Elements that conduct heat and electricity
moderately well, and possess some properties of metals and some properties of
nonmetals.
Main group metals, transition metals, metalloids, non-metals - ANSWER:
Alkali metals, alkaline earth metals, halogens, noble gases - ANSWER:
What is an ionic bond? - ANSWER: One atom loses an electron, becomes positive
cation. One atom gains a valence electron and becomes a negative anion. Due to this,
the two atoms are attracted to each other.
What is a covalent bond? - ANSWER: Two atoms share a pair of valence electrons.
What is a polar covalent bond? - ANSWER: Sharing of the valence electron pair is
unbalanced, causing one atom to be more negatively charged than the other.
CHEM 105 FINAL EXAM PORTAGE LEARNING
LATEST ACTUAL EXAM QUESTIONS AND
CORRECT DETAILED ANSWERS (CORRECT
VERIFIED ANSWERS) NEWEST UPDATED
VERSION |ALREADY GRADED A+
Beginning of SI Units
Units can be length (meters), volume (liters), and mass (grams) - ANSWER: Yay
Prefixes (Large to small)
Mega - ANSWER: M
1 X 10^6 m = 1 Mm
One million meters in one Megameter
Kilo - ANSWER: k
1 x 10^3 m = 1 Km
1000 meters in 1 Kilometer
centi - ANSWER: c
10^2 cm = 1 m
100 centimeters in 1 meter
milli - ANSWER: m
10^3 mm = 1 m
1000 millimeters in 1 meter
micro - ANSWER: u
10^6 um = 1 m
1 million micrometers in 1 meter
nano - ANSWER: n
10^9 nm = 1 m
1 Billion nanometers in 1 meter
Angstrom - ANSWER: A
10^10 A = 1 m
10 billion A in 1 meter
pico
End of Si Units - ANSWER: p
10^12 pm = 1 m
,1 trillion picometers in 1 meter
What is the relationship between melting point and freezing point? - ANSWER: They
occur at the same temperature for a substance.
Why are solids and liquids denser than gases? - ANSWER: Particles are in direct
contact, more per unit of volume (mass).
What happens to the average speed of atoms as the temperature of a substance
increases? - ANSWER: The average speed of atoms increases.
Which remains solid at higher temperatures: argon or neon? - ANSWER: Argon
remains solid at higher temperatures than neon.
Gas phase - ANSWER: Molecules far apart and move a lot.
Liquid phase - ANSWER: Molecules in close contact and slide past each other.
Solid phase - ANSWER: Molecules rigidly connected and vibrate.
Chemical changes - ANSWER: Bonds breaking, combustion, new substances form.
Produces new kinds of matter
Physical changes - ANSWER: Transitions between s/l/g, no breaking of bonds,
density, conductivity, solubility, color, hardness, melting and boiling points
Symbol
Atomic mass
Atomic number - ANSWER: Symbol: C
Atomic Mass: 12 (protons + neutrons)
Atomic Number: 6 (protons)
In neutral atoms, p+=e-
(carbon has 6 electrons when neutral)
Why is writing a 6 and C redundant? - ANSWER: Elements are defined by their
atomic numbers. # of protons cannot change without changing the elements identity.
All carbon isotopes will all have 6 protons. So an atom with ^ protons will always be
Carbon. They mean the same thing.
Rutheford's Experiment/Gold foil experiment - ANSWER: Prediction:
-most particles pass through
-small deflections
No real interaction should happen
Observation:
-Most particles passed through undeflected
-Some particles deflected at large angles
-Some particles reflected back to source
Rutheford's experiment conclusion? - ANSWER: Most of an atom is empty space,
with a large, dense, positive mass in the center
, What is an element? - ANSWER: Pure chemical substance consisting of one type of
atom.
Which element is most abundant in the earth's crust? - ANSWER: Oxygen.
What is an atom? - ANSWER: Smallest particle of an element that retains the
characteristic properties of that element.
What is a compound? - ANSWER: Pure chemical substance consisting of two or
more different chemical elements.
What is the unique characteristic of chemical compounds? - ANSWER: They have a
unique and defined chemical structure. (H2O, always two hydrogen with one oxygen)
How are atoms arranged in compounds? - ANSWER: They consist of a fixed ratio of
atoms that are held together in a defined spatial arrangement by chemical bonds.
What type of bonds hold together molecular compounds? - ANSWER: Covalent
bonds.
What type of bonds hold together salts? - ANSWER: Ionic bonds.
What is a molecule? - ANSWER: Electrically neutral group of at least two atoms in a
definite arrangement that retains the composition and chemical characteristics of a
compound.
What are metals? - ANSWER: Elements that are shiny, malleable, and good
conductors of heat and electricity.
What are nonmetals? - ANSWER: Elements that appear dull and are poor conductors
of heat and electricity.
What are metalloids? - ANSWER: Elements that conduct heat and electricity
moderately well, and possess some properties of metals and some properties of
nonmetals.
Main group metals, transition metals, metalloids, non-metals - ANSWER:
Alkali metals, alkaline earth metals, halogens, noble gases - ANSWER:
What is an ionic bond? - ANSWER: One atom loses an electron, becomes positive
cation. One atom gains a valence electron and becomes a negative anion. Due to this,
the two atoms are attracted to each other.
What is a covalent bond? - ANSWER: Two atoms share a pair of valence electrons.
What is a polar covalent bond? - ANSWER: Sharing of the valence electron pair is
unbalanced, causing one atom to be more negatively charged than the other.
