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CEM 141 MSU Final Exam (1). Questions & 100% Verified Correct Answers with complete solutions (Latest update CA$11.17   Add to cart
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CEM 141 MSU Final Exam (1). Questions & 100% Verified Correct Answers with complete solutions (Latest update

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CEM 141 MSU Final Exam (1). Questions & 100% Verified Correct Answers with complete solutions (Latest update

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  • August 15, 2024
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CEM 141 MSU Final Exam
Consider the question: Is there an attractive force between a pencil and the earth?
Is this a scientific question? [Yes or No]
Because
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. - ANS-Yes because it can
be tested and answered though observations and experiments

Which of the following properties ascribed to atoms by the Greeks do we still consider valid?
I. Atoms are mostly empty space
II. The size and shape of the atoms determine a material's properties
III. Atoms are indivisible
IV. Atoms are in constant motion - ANS-Atoms are mostly empty space
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
Evidence:
III. Most of the positively charged alpha particles shot at a thin gold foil passed straight through.
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. - ANS-The cathode ray tube experiment
The beam of particles emitted from the cathode bent toward the positively charged plate.

Which of the following contain(s) atoms?
a. Heat
b. Light
c. Energy
d. Dust
e. All of the above - ANS-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?
IV. Alpha particles bounce off the nuclei within the gold atoms because the nuclei are much
more 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. - ANS-III
because the alpha particles go straight through the atom because it is mostly empty space.

Thomson's cathode ray tube experiment proved FALSE what part of Dalton's atomic theory?
a. All atoms are indivisible and indestructible
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 - ANS-All atoms are indivisible and
indestructable

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
b. The electrostatic force would become weaker
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. - ANS-The electrostatic force would become
stronger

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
III. An element is made up of one type of atom. Nitrogen is an element that 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. -
ANS-True because an element is made up of one type of atom. Nitrogen is an element that
exists as diatomic 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.
b. Because the electrostatic attractive force from the instantaneous dipoles 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. - ANS-Because the repulsive force between the overlapping electron clouds is
dominant

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 other atom.

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