CEM 141 MSU Final Exam Questions with Correct Answers Graded A+

CEM 141 MSU Final Exam Questions with Correct Answers Graded A+ Yes because it can be tested and answered though observations and experiments - Answers 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 - Answers 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. - Answers 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 - Answers 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. - Answers 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 - Answers 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 - Answers 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 c. The electrostatic force would become stronger or weaker depending on whether the force is attractive or repulsive. d. It is impossible to say from the information given. True because an element is made up of one type of atom. Nitrogen is an element that exists as diatomic molecules. - Answers Consider the following statement: "A nitrogen molecule is made up of the same type of atoms." Is this statement true or false and why? I. True II. False III. An element is made up of one type of atom. Nitrogen is an element that exists as diatomic molecules. IV. Nitrogen is a compound that exists as diatomic molecules. Compounds are made of different types of atoms.