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

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CEM 141 Final Exam (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 1

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  • Chemistry 141
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CEM 141 Final Exam
Because both the alpha particles and the nucleus are positively charged and so the alpha
particle is repelled. - ANS-Why are alpha particles deflected by the nucleus?

False.
Atoms of the same element can have different numbers of neutrons. - ANS-Is this statement
(Dalton's Theory) true or false and why?
"All atoms of an element are identical and have the same mass and properties."

The nature of the electron is independent of the material from which it emerges. - ANS-What is
the evidence that electrons are subatomic particles?

The properties of matter can be EXPLAINED by understanding that matter is composed of
atoms that interact and move in various predictable ways. - ANS-Example of a theory (explains)

Because iodine has a larger more polarizable electron cloud. The electrostatic attraction
between the iodine molecules requires more energy to overcome. - ANS-Why is the boiling
point of iodine higher than that of bromine?

Attractive forces between molecules are overcome. - ANS-When bromine melts, what is
happening?

New LDFs are formed. Energy is released to the surroundings. Energy is transferred via
collisions. - ANS-When oxygen freezes, what is happening with the forces and energy changes
during this process?

The PE well, where the attractive and repulsive forces are equal and the system is most stable.
- ANS-Where would two atoms of He be most stable on a PE curve?

Both gravitational and electrostatic. - ANS-For a pencil sitting on a desk, what forces are acting
upon the pencil?

Two protons (positively charged/same charge). - ANS-If the PE increases as two particles
approach, what are they most likely?

Thermal energy is transferred upon collision with other atoms. - ANS-How do atoms know that
temperature is increasing?

100g and 1g separated by 5 meters.
(100)(1)/(25) = 4 - ANS-What two atoms would have the greatest gravitational forces? Two 10g
separated by 10 meters. Or, one 100g and one 1g separated by 5 meters?

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