MSU CEM 141 FINAL EXAM PREP NEWEST ACTUAL 2026
EXAM WITH COMPLETE QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY
GRADED A+
What type of interactions are formed or strengthened between $Cl_2$ molecules
when chlorine freezes? -ANSWER-London dispersion forces.
When comparing two substances, what does it mean if one has a deeper potential
energy well? -ANSWER-It has stronger intermolecular forces and a higher
boiling point.
How many hydrogen atoms are in one mole of dichloromethane ($CH_2Cl_2$)? -
ANSWER-$1.204 \times 10^{24}$ H atoms ($2 \times 6.022 \times 10^{23}$).
What happens to atoms during a chemical reaction according to Dalton's atomic
theory? -ANSWER-They are rearranged, but not created or destroyed.
What observation in the cathode ray tube experiment provided evidence that
electrons are negatively charged? -ANSWER-The beam of particles emitted from
the cathode bent toward the positively charged plate.
What was the key conclusion drawn from Rutherford's gold foil experiment? -
ANSWER-The atom is mostly empty space with a small, dense, positively
charged nucleus.
, What specific observation from the gold foil experiment led to the conclusion of a
dense, positive nucleus? -ANSWER-A small fraction of positively charged alpha
particles were deflected at large angles.
Which part of Dalton's atomic theory was proven false by Thomson's cathode ray
tube experiment? -ANSWER-The idea that atoms are indivisible and
indestructible.
How does the strength of the electrostatic force change if the distance between two
charged objects decreases? -ANSWER-The electrostatic force becomes stronger.
Why does potential energy increase when two xenon atoms are moved extremely
close together? -ANSWER-The repulsive force between the overlapping electron
clouds becomes dominant.
What is the interaction where an instantaneous dipole on one atom induces a dipole
on a neighboring atom called? -ANSWER-London Dispersion Force (LDF).
When a covalent bond is formed between two atoms, is energy absorbed or
released? -ANSWER-Energy is released.
Why is the London dispersion force between two argon atoms stronger than
between two neon atoms? -ANSWER-Argon has a larger, more polarizable
electron cloud, allowing for a greater separation of charge.
EXAM WITH COMPLETE QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY
GRADED A+
What type of interactions are formed or strengthened between $Cl_2$ molecules
when chlorine freezes? -ANSWER-London dispersion forces.
When comparing two substances, what does it mean if one has a deeper potential
energy well? -ANSWER-It has stronger intermolecular forces and a higher
boiling point.
How many hydrogen atoms are in one mole of dichloromethane ($CH_2Cl_2$)? -
ANSWER-$1.204 \times 10^{24}$ H atoms ($2 \times 6.022 \times 10^{23}$).
What happens to atoms during a chemical reaction according to Dalton's atomic
theory? -ANSWER-They are rearranged, but not created or destroyed.
What observation in the cathode ray tube experiment provided evidence that
electrons are negatively charged? -ANSWER-The beam of particles emitted from
the cathode bent toward the positively charged plate.
What was the key conclusion drawn from Rutherford's gold foil experiment? -
ANSWER-The atom is mostly empty space with a small, dense, positively
charged nucleus.
, What specific observation from the gold foil experiment led to the conclusion of a
dense, positive nucleus? -ANSWER-A small fraction of positively charged alpha
particles were deflected at large angles.
Which part of Dalton's atomic theory was proven false by Thomson's cathode ray
tube experiment? -ANSWER-The idea that atoms are indivisible and
indestructible.
How does the strength of the electrostatic force change if the distance between two
charged objects decreases? -ANSWER-The electrostatic force becomes stronger.
Why does potential energy increase when two xenon atoms are moved extremely
close together? -ANSWER-The repulsive force between the overlapping electron
clouds becomes dominant.
What is the interaction where an instantaneous dipole on one atom induces a dipole
on a neighboring atom called? -ANSWER-London Dispersion Force (LDF).
When a covalent bond is formed between two atoms, is energy absorbed or
released? -ANSWER-Energy is released.
Why is the London dispersion force between two argon atoms stronger than
between two neon atoms? -ANSWER-Argon has a larger, more polarizable
electron cloud, allowing for a greater separation of charge.
