CEM 141-Exam 1 UPDATED ACTUAL
QUESTIONS AND CORRECT ANSWERS
Atoms - CORRECT ANSWER Matter is made up of
Atom - CORRECT ANSWER The the smallest distinguishable part of an element
Theories - CORRECT ANSWER Can change overtime according to the evidence available
Electrostatic forces - CORRECT ANSWER ALL atoms/molecules attract to one another due to
Attractions - CORRECT ANSWER ________ lower potential energy of a system
Repulsions - CORRECT ANSWER _____ raise potential energy of a system
The attractive and repulsive forces are EQUAL or the potential energy is at a minimum - CORRECT
ANSWER Stable systems form where
The well - CORRECT ANSWER The most stable part of a graph is
The strength of the inter molecular forces - CORRECT ANSWER The temperature of a phase
change depends on
? - CORRECT ANSWER Why do two isolated atoms attract each other as they approach and
repel after coming too close together?
? - CORRECT ANSWER Predict and explain the changes in the potential energy, the kinetic
energy and the total energy as two isolated helium (or another noble gas) atoms approach each other.
? - CORRECT ANSWER Construct a diagram/picture and use it to explain how energy is
transferred at the atomic level (by collisions that can either add energy to the system or remove it)
, ? - CORRECT ANSWER Predict/rank the relative London Dispersion Forces between atoms
and molecules of different sizes
? - CORRECT ANSWER ?Relate the strength of London Dispersion Forces to relative melting
and boiling points for the noble gases or simple diatomic molecules (H2, N2, O2,F2, Cl2, Br2, and I2)
H2, N2, O2, F2, Cl2, Br2, I2 - CORRECT ANSWER List all the diatomic molecules
? - CORRECT ANSWER Contrast the energy change that occurs when two helium atoms or
two hydrogen atoms combine
LDFs occur between two atoms, covalent bonding occurs IN a molecule - CORRECT ANSWER
Differentiate between London Dispersion Forces and covalent bonding
Law - CORRECT ANSWER Described phenomenon, tells WHAT
Theory - CORRECT ANSWER Explains phenomenon, tells WHY
Ions - CORRECT ANSWER Charged atoms are
Positive - CORRECT ANSWER Protons have a ____ charge
Negative - CORRECT ANSWER Electrons have a ____ charge
Neutral - CORRECT ANSWER Neutrons have a ____ charge
Neutral - CORRECT ANSWER as a WHOLE atoms have a ____ charge
Scientific theory - CORRECT ANSWER BEST available explanation of existing
evidence/data/oberservations
QUESTIONS AND CORRECT ANSWERS
Atoms - CORRECT ANSWER Matter is made up of
Atom - CORRECT ANSWER The the smallest distinguishable part of an element
Theories - CORRECT ANSWER Can change overtime according to the evidence available
Electrostatic forces - CORRECT ANSWER ALL atoms/molecules attract to one another due to
Attractions - CORRECT ANSWER ________ lower potential energy of a system
Repulsions - CORRECT ANSWER _____ raise potential energy of a system
The attractive and repulsive forces are EQUAL or the potential energy is at a minimum - CORRECT
ANSWER Stable systems form where
The well - CORRECT ANSWER The most stable part of a graph is
The strength of the inter molecular forces - CORRECT ANSWER The temperature of a phase
change depends on
? - CORRECT ANSWER Why do two isolated atoms attract each other as they approach and
repel after coming too close together?
? - CORRECT ANSWER Predict and explain the changes in the potential energy, the kinetic
energy and the total energy as two isolated helium (or another noble gas) atoms approach each other.
? - CORRECT ANSWER Construct a diagram/picture and use it to explain how energy is
transferred at the atomic level (by collisions that can either add energy to the system or remove it)
, ? - CORRECT ANSWER Predict/rank the relative London Dispersion Forces between atoms
and molecules of different sizes
? - CORRECT ANSWER ?Relate the strength of London Dispersion Forces to relative melting
and boiling points for the noble gases or simple diatomic molecules (H2, N2, O2,F2, Cl2, Br2, and I2)
H2, N2, O2, F2, Cl2, Br2, I2 - CORRECT ANSWER List all the diatomic molecules
? - CORRECT ANSWER Contrast the energy change that occurs when two helium atoms or
two hydrogen atoms combine
LDFs occur between two atoms, covalent bonding occurs IN a molecule - CORRECT ANSWER
Differentiate between London Dispersion Forces and covalent bonding
Law - CORRECT ANSWER Described phenomenon, tells WHAT
Theory - CORRECT ANSWER Explains phenomenon, tells WHY
Ions - CORRECT ANSWER Charged atoms are
Positive - CORRECT ANSWER Protons have a ____ charge
Negative - CORRECT ANSWER Electrons have a ____ charge
Neutral - CORRECT ANSWER Neutrons have a ____ charge
Neutral - CORRECT ANSWER as a WHOLE atoms have a ____ charge
Scientific theory - CORRECT ANSWER BEST available explanation of existing
evidence/data/oberservations
