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CEM 141 Final Exam Mock Quizzes (1). Questions & 100% Verified Correct Answers with complete solutions (Latest update $7.99   Add to cart
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CEM 141 Final Exam Mock Quizzes (1). Questions & 100% Verified Correct Answers with complete solutions (Latest update

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

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  • August 15, 2024
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  • 2024/2025
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  • cem 141 final exam mock quizzes 1

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CEM 141 Final Exam Mock Quizzes
- ANS-Which diagram shows molecules of a compound?

I, III - ANS-Thomson's experiment allowed him to make the claim that all atoms have a sub
structure and contain smaller particles (electrons) embedded in the structure of the atom. What
evidence and reasoning allowed him to make this claim?

Evidence:
I. Electrons were ejected from the cathode, regardless of what metal the cathode was made of.
II. Electrons were bent by magnetic and electric fields

Reasoning:
III. Since the particles are emitted regardless of the nature of the cathode, they must be part of
the sub-structure of the atom
IV. Electrons must be negatively charged because they accelerate towards the anode (positive
end of the apparatus).

explains the underlying cause of a range of phenomena. - ANS-the atomic theory of matter is an
example of a scientific theory. what distinguishes it from a scientific law such as the law of
gravity? the atomic theory:

the atom is mostly empty space with a very small dense nucleus - ANS-what is the claim?

most alpha particles went straight through, only a few were deflected - ANS-what is the
evidence?

the positively charged alpha particles were deflected by the repulsive interaction with the
positive nucleus; since only a few were deflected the nucleus must take up a very small volume
of the atom. - ANS-what is the reasoning?

Positive potential energy curve with high potential energy going down (see quiz key) -
ANS-Which graph shows the relationship between the potential energy of a system as two
positively charged object approach

II and IV - ANS-Is this statement (one of Dalton's atomic theory tenets) true or false and why?
Elements are composed of small indivisible, indestructible particles called atoms.

I. True
II. False

Reasoning

, III. Atoms can neither be created nor destroyed
IV. Atoms have a sub-structure
V. Elements can be identified by the type of atoms they have in them.

M3 and M4 - ANS-Consider the following four objects:
M1 = 5 g M3 = 10 g
M2 = 5 g M4 = 10 g

Assume that the objects are separated by equal distance. Between which two objects is the
gravitational force the strongest?

II and III - ANS-What is wrong with the following statement?
As the ball falls its potential energy decreases.

I. As the ball falls the potential energy increases
II. A single object cannot possess potential energy
III. There is no mention of a field

II and V - ANS-Consider the question: Does the tooth fairy have wings?
Is this question a scientific question? Why or why not?

I. Yes
II. No
Because
III. It can be tested and answered through observations and experiments.
IV. The answer is already known and we can ask our instructor.
V. There is no way to design an experiment to answer this question.

the electrostatic force would become weaker - ANS-How would the strength of the electrostatic
force change if the distance between two charged objects increased?

all are true - ANS-Which of these statements are true:

I. All neutral atoms and molecules attract each other.
II. London dispersion forces increase as the size of the electron cloud increases.
III. It takes energy to overcome the attractions between particles.
IV. Energy is released to the surroundings when atoms form a stable interaction.

where the potential energy is at a minimum - ANS-the distance between the two helium atoms
where the system would be the most stable is:

the electron clouds repel each other - ANS-two atoms approach and get close enough so that
their electron clouds overlap. Why does the potential energy increase?

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