CHEM 101 Mock Exam 1 Spring For the following questions, please select the most correct answer.
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1 For the following questions, please select the most correct answer. 1.) Matter is a. Something important. b. Something that has mass and occupies space. c. Something that has weight and occupies space. d. Something that has weight and indefinite volume. 2.) Atoms are a. The smallest unit in chemistry. b. A substance entirely composed of one element. c. The smallest unit that retains the chemical properties of an element. d. Matter. e. All of the above. 3.) What is the SI unit for energy? a. Newtons b. Volts c. Coulombs d. Joules 4.) What are the states of matter, in order of highest to least energy? a. Solids, liquids, gases b. Gases, liquids, solids c. Liquids, gases, solids d. Gases, solids, liquids 5.) What are the states of matter, in order from most to least amount of atomic motion? a. Solids, liquids, gases b. Liquids, gases, solids c. Gases, solids, liquids d. Gases, liquids, solids 6.) What substances can be physically separated? a. Mixtures b. Pure substances c. Compounds d. None of the above e. Two of the above 7.) Who discovered the electron? a. Earnest Rutherford b. Niels Bohr c. Robert Millikan d. J. J. Thompson 8.) Who proposed the atomic orbital diagram? a. J. J. Thompson b. Earnest Rutherford c. Robert Millikan d. Niels Bohr 9.) Who discovered the proton? a. Earnest Rutherford b. J. J. Thompson c. Neils Bohr d. Robert Millikan 10.) Who discovered the neutron? a. J. J. Thompson b. Earnest Rutherford c. Robert Millikan d. Niels Bohr 11.) Who proposed the plum pudding atomic diagram? a. Earnest Rutherford b. J. J. Thompson c. Neils Bohr d. Robert Millikan
2 12.) What is the value of the prefix M? a b c d ) What is the value for the prefix μ? a b c d ) Which of the following values has 4 significant digits? a b c d ) How many significant digits are in ? a. 2 b. 5 c. 3 d. 1 For the following statements, decide whether they are true or false. If the statement is false, correct it. 1.) The weight of a large stack of books is a physical property. 2.) Protons, nucliotides, and electrons are all examples of subatomic particles. 3.) Salad dressing is a homogenous mixture. 4.) Energy is the ability to do work. 5.) Atoms are the smallest unit and cannot be broken down any further. 6.) Electrons are the most massive subatomic particles. 7.) Robert Millikan proposed that all things are composed of tiny building blocks called atoms. 8.) Seawater is a homogeneous mixture. 9.) The atmosphere is made up of compounds.
3 Fill in the blank with the word that best completes the sentence. 1.) The Periodic Table was first arranged by. 2.) A is a positively charged ion, while a is a negatively charged ion. 3.) The number of defines an element. 4.) Protons have a charge, neutrons have a charge, and electrons have a charge. 5.) The mass number is the number of plus the number of in an atom. The following questions require a short answer. Please show all of your work! 1.) What is an isotope? 2.) What are alpha and beta particles? Describe their mass and their charge.
4 CHEM 101 Mock Exam 1 Spring ) Describe the Gold Foil Experiment who conducted it, how was it conducted, what were the results, what were the ramifications and significance of the results? 4.) Describe the Cathode Ray Experiment who conducted it, how was it conducted, what did the results prove, etc? 5.) Convert nm to km. 6.) (remember sig figs!!) 7.) x 32.6 x (remember sig figs!!)
5 8.) Write the following in scientific notation: a b c d ) How many atoms are in 12 moles of Cu? 10.) What is the mass of 34 moles of NaCl? 11.) How many moles are in 13 g of H2SO4? 12.) What is the mass of an object that has a density of 4.72 g/ml and displaces 4.12 L of water?
6 13.) How many atoms are there in 36 g of CO2? 14.) How many moles of O are in g of CH3COOH? Complete the following table: Atomic Number of Number of Number of Mass Number Symbol Protons Electrons Neutrons C Ge Mg
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