CEM 141 Final Exam Mock-Question with Correct Answers/ Verified
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Course
Cem 141
Institution
Cem 141
-️️Which diagram shows molecules of a compound?
I, III -️️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?
E...
CEM 141 Final Exam Mock-Question with Correct Answers/ Verified
- ✔️✔️Which diagram shows molecules of a compound?
I, III - ✔️✔️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. - ✔️✔️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 - ✔️✔️what is the claim?
most alpha particles went straight through, only a few were deflected - ✔️✔️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. -
✔️✔️what is the reasoning?
Positive potential energy curve with high potential energy going down (see quiz key) - ✔️✔️Which
graph shows the relationship between the potential energy of a system as two positively charged
object approach
II and IV - ✔️✔️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 - ✔️✔️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 - ✔️✔️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 - ✔️✔️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.
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