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CEM 141 MSU Final Exam EXAM 2024 QUESTIONS WITH CORRECT ANS_.pdf
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8/18/24, 3:36 AMCEM 141 MSU Final Exam
Jeremiah
Terms in this set (35)
Consider the question: Is there an attractive force between a pencil and the earth?
Is this a scientific question? [Yes or No]
Yes because it can be tested and answered Because
though observations and experiments III. It can be tested and answered through observations and experiments
IV. The answer is already known and we find it online
V. There is no way to design an experiment to answer this question.
Which of the following properties ascribed to atoms by the Greeks do we still consider
valid?
Atoms are mostly empty space I. Atoms are mostly empty space
Atoms are in constant motion II. The size and shape of the atoms determine a material's properties
III. Atoms are indivisible
IV. Atoms are in constant motion
Electrons are negatively charged. Which experiment provided evidence to support this
claim? What is the specific evidence used to support this claim?
Experiment:
I. The gold foil experiment
II. The cathode ray tube experiment
The cathode ray tube experiment Evidence:
The beam of particles emitted from the III. Most of the positively charged alpha particles shot at a thin gold foil passed straight
cathode bent toward the positively charged through.
plate. IV. A small fraction of the positively charged alpha particles shot at a thin gold foil were
deflected.
V. The beam of particles emitted from the cathode bent toward the positively charged
plate.
VI. The beam of particles emitted from the cathode behaved the same no matter what
type of metal the cathode was made of.
Which of the following contain(s) atoms?
a. Heat
b. Light
All of the above
c. Energy
d. Dust
e. All of the above
The diagram below shows alpha particles being
fired at a piece of gold foil. Where will the majority
of the alpha particles be detected (point I, II, or III)
and why?
III because the alpha particles go straight IV. Alpha particles bounce off the nuclei within the
through the atom because it is mostly empty gold atoms because the nuclei are much more
space. massive than the alpha particles.
V. The alpha particles are repelled when they come
close to the nuclei because both are charged.
VI. The alpha particles go straight through the atom
because it is mostly empty space.
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, 8/18/24, 3:36 AM
Thomson's cathode ray tube experiment proved FALSE what part of Dalton's atomic
theory?
a. All atoms are indivisible and indestructible
All atoms are indivisible and indestructable b. All atoms of a given element are identical
c. All matter is made of atoms.
d. Compounds are formed from the combination of two or more elements.
e. Chemical reactions are rearranging of atoms
How would the strength of the electrostatic force change if the distance between the
two charged objects decreased?
a. The electrostatic force would become stronger
The electrostatic force would become
b. The electrostatic force would become weaker
stronger
c. The electrostatic force would become stronger or weaker depending on whether the
force is attractive or repulsive.
d. It is impossible to say from the information given.
Consider the following statement: "A nitrogen molecule is made up of the same type of
atoms." Is this statement true or false and why?
I. True
II. False
True because an element is made up of one
III. An element is made up of one type of atom. Nitrogen is an element that exists as
type of atom. Nitrogen is an element that
diatomic molecules.
exists as diatomic molecules.
IV. Nitrogen is a compound that exists as diatomic molecules. Compounds are made of
different types of atoms.
V. Nitrogen is an element and therefore must exist as separate atoms and not
molecules.
Why does the potential energy increase as two xenon atoms move extremely close
together?
a. Because the kinetic energy decreases as the atoms slow down.
Because the repulsive force between the
b. Because the electrostatic attractive force from the instantaneous dipoles is dominant.
overlapping electron clouds is dominant
c. Because the repulsive force between the overlapping electron clouds is dominant.
d. Because there is more potential energy than kinetic energy when the atoms are close
together.
Which statement best describes the forces that exist between helium atoms in the solid
state?
a. The electron cloud on one helium atom is attracted to the electron cloud on the
The partial positive end of one atom's
other atom.
instantaneous dipole attracts the partial
b. The nucleus of one helium atom is repelled by the nucleus of the neighboring atom.
negative end of the neighboring atom's
c. The helium atoms share electrons, forming a bond.
induced dipole.
d. The partial positive end of one atom's instantaneous dipole attracts the partial
negative end of the neighboring atom's induced dipole.
e. Both atoms have mass, so they are attracted to each other by gravitational forces.
When a covalent bond is formed between two nitrogen atoms:
I. Energy is absorbed
Energy is released
II. Energy is released
A molecule is formed
III. A molecule is formed
IV. The nitrogen changes from the gaseous to the liquid state.
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