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CEM 141 MSU FINAL EXAM QUESTIONS AND ANSWERS WITH SOLUTIONS 2024
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CEM 141 MSU FINAL EXAM QUESTIONS AND ANSWERS WITH SOLUTIONS 2024
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CEM 141 MSU FINAL EXAM QUESTIONSAND ANSWERS WITH SOLUTIONS 2024
Yes because it can be tested and answered though observations and experiments - ANSWER 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.
Atoms are mostly empty space
Atoms are in constant motion - ANSWER 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
The cathode ray tube experiment
The beam of particles emitted from the cathode bent toward the positively charged plate. - ANSWER
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.
All of the above - ANSWER Which of the following contain(s) atoms?
a. Heat
b. Light
c. Energy
d. Dust
e. All of the above
III because the alpha particles go straight through the atom because it is mostly empty space. - ANSWER
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.
All atoms are indivisible and indestructable - ANSWER 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
The electrostatic force would become stronger - ANSWER 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
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