CEM 141 MSU Final Exam with Questions and Correct Answers
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Course
CEM 141
Institution
CEM 141
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 e...
CEM 141 MSU Final Exam with Questions and Correct A nswers 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 a nswer this question. - ✔✔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 - ✔✔Atoms are mostly empty space Atoms are in constant motion Electrons are negatively charged. Which experiment provided evidence to support this clai m? 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 s mall 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. - ✔✔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 - ✔✔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 nucl ei 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. - ✔✔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 - ✔✔All atoms are indivisible and indestructable How would t he strength of the electrostatic force change if the distance between the two charged objects decreased? a. The electrostatic force would become stronger
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