CEM 141 EXAM 1 2026 INTRODUCTORY
CHEMISTRY ASSESSMENT QUESTIONS
SOLUTIONS GRADED A+
◉ Atom.
Answer: The the smallest distinguishable part of an element
◉ Theories.
Answer: Can change overtime according to the evidence available
◉ Electrostatic forces.
Answer: ALL atoms/molecules attract to one another due to
◉ Attractions.
Answer: ________ lower potential energy of a system
◉ Repulsions.
Answer: _____ raise potential energy of a system
◉ The attractive and repulsive forces are EQUAL or the potential
energy is at a minimum.
, Answer: Stable systems form where
◉ The well.
Answer: The most stable part of a graph is
◉ The strength of the inter molecular forces.
Answer: The temperature of a phase change depends on
◉ ?.
Answer: Why do two isolated atoms attract each other as they
approach and repel after coming too close together?
◉ ?.
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.
◉ ?.
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)
◉ ?.
CHEMISTRY ASSESSMENT QUESTIONS
SOLUTIONS GRADED A+
◉ Atom.
Answer: The the smallest distinguishable part of an element
◉ Theories.
Answer: Can change overtime according to the evidence available
◉ Electrostatic forces.
Answer: ALL atoms/molecules attract to one another due to
◉ Attractions.
Answer: ________ lower potential energy of a system
◉ Repulsions.
Answer: _____ raise potential energy of a system
◉ The attractive and repulsive forces are EQUAL or the potential
energy is at a minimum.
, Answer: Stable systems form where
◉ The well.
Answer: The most stable part of a graph is
◉ The strength of the inter molecular forces.
Answer: The temperature of a phase change depends on
◉ ?.
Answer: Why do two isolated atoms attract each other as they
approach and repel after coming too close together?
◉ ?.
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.
◉ ?.
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)
◉ ?.
