Chemistry Exam Preparation Quiz
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Questions and Answers

What must be verified before starting the exam?

  • Check that all items are placed out of sight
  • Confirm your identification number is written down
  • Ensure the Form number on your Scantron matches the exam packet (correct)
  • Make sure you have a scientific calculator at your desk

    • What could happen if a student possesses unauthorized materials during the exam?

  • The materials will be confiscated but the exam will continue
  • The student may receive a warning
  • The student will receive a grade of 0 and face additional academic consequences (correct)
  • The student will earn a passing grade for the exam

    • What should you do if you notice missing pages in the exam packet?

  • Request a new copy of the exam immediately (correct)
  • Ask fellow students if they have the same issue
  • Ignore it and continue with the exam
  • Complete the exam and inform the instructor after

    • When is the deadline for submitting Scantron forms?

    <p>9:35 pm</p> Signup and view all the answers

    What is required in order to verify your identity during the exam?

    <p>A student ID must be shown</p> Signup and view all the answers

    What is the correct empirical formula for the compound of bromine and fluorine that contains 58.37 mass percent bromine?

    <p>BrF3</p> Signup and view all the answers

    Which pair of elements represents the correct atomic symbols in the context presented?

    <p>Cl and Br</p> Signup and view all the answers

    What is the molecular weight of nitrobenzene (C6 H5 NO2) in amu?

    <p>107.11</p> Signup and view all the answers

    How is the following data from a measurement considered? 23.96 g, 24.01 g, 23.98 g, 23.97 g.

    <p>Accurate and precise</p> Signup and view all the answers

    What is the density of a wooden object with a mass of 10.782 g and a volume of 13.72 mL, determined to the appropriate significant figures?

    <p>7.86 × 10^-1 g/mL</p> Signup and view all the answers

    What is the proper form of the result of $(4.980 - 1.8621) \times 2.5630$?

    <p>7.991</p> Signup and view all the answers

    In combustion analysis of C6 H12O6, what can be inferred about the mass of H2O produced if 0.600 g of glucose is analyzed?

    <p>It will produce an amount of water based on stoichiometric calculations.</p> Signup and view all the answers

    Which of the following best describes the significance of significant figures in a measurement of 15.00 cm?

    <p>All digits including the trailing zeros are significant.</p> Signup and view all the answers

    Which formula/name pair is incorrect?

    <p>Mg3N2 magnesium nitrite</p> Signup and view all the answers

    Which of the following samples contains the greatest number of atoms?

    <p>150 g of NaCl</p> Signup and view all the answers

    Which equation represents the relationship between heat, mass, specific heat capacity, and change in temperature?

    <p>q = m \cdot C \cdot (T_f - T_i)</p> Signup and view all the answers

    What is the formula for calculating the enthalpy change of a reaction?

    <p>ΔH°rxn = {SΔH°f (products) - SΔH°f (reactants)}</p> Signup and view all the answers

    Which of the following statements about isotopes is true?

    <p>Isotopes have the same number of protons but different numbers of neutrons.</p> Signup and view all the answers

    In thermodynamics, what is the relationship between the work done on a system and its internal energy?

    <p>W = -ΔU</p> Signup and view all the answers

    For a given reaction, how is the change in enthalpy (ΔH°rxn) defined?

    <p>The sum of the enthalpy of products minus the sum of the enthalpy of reactants.</p> Signup and view all the answers

    What is the relationship between Celsius and Fahrenheit temperature scales?

    <p>TF = (9/5)TC + 32</p> Signup and view all the answers

    Which of the following conversion factors correctly converts liters to quarts?

    <p>1 L = 1.056710 qt</p> Signup and view all the answers

    What is the standard molar gas constant (R) expressed in J K-1 mol-1?

    <p>8.314</p> Signup and view all the answers

    What is the enthalpy of vaporization (DHvap) for water?

    <p>40.68 kJ/mol</p> Signup and view all the answers

    Which equation describes the change in internal energy (DE) of a system?

    <p>DE = q + w</p> Signup and view all the answers

    What is the value of the electron charge in coulombs?

    <p>1.602 x 10–19 C</p> Signup and view all the answers

    Which of the following correctly calculates the pressure in atmospheres (atm) when given in kilopascals (kPa)?

    <p>1 atm = 101.325 kPa</p> Signup and view all the answers

    What is the density of water at standard conditions?

    <p>1.00 g/mL</p> Signup and view all the answers

    What is the conversion for kilometers to miles?

    <p>1 km = 0.62137 miles</p> Signup and view all the answers

    Which of the following is the correct formula to convert Celsius to Kelvin?

    <p>TK = TC + 273.15</p> Signup and view all the answers

    What is the correct mass percentage of hydrogen in a mixture of 1 mole of C2H6 and 1 mole of NH3?

    <p>37.6%</p> Signup and view all the answers

    How many moles are contained in 47.51 g of aluminum oxide (Al2O3)?

    <p>1.105 mol</p> Signup and view all the answers

    What is the empirical formula for a compound that produces 4.171 g of CO2 and 2.268 g of H2O upon combustion?

    <p>C2H5O2</p> Signup and view all the answers

    How many significant figures should be retained in the result of 12.00000 × 0.9893 + 13.00335 × 0.0107?

    <p>4</p> Signup and view all the answers

    Which of the following pairs of compounds do not share the same empirical formula?

    <p>C2H4O2, C6H12O6</p> Signup and view all the answers

    Which of the following expresses 550 milligrams in kilograms?

    <p>5.5 × 10–4 kg</p> Signup and view all the answers

    What is the correct name for HNO2?

    <p>nitrous acid</p> Signup and view all the answers

    How many moles of oxygen atoms are contained in one million molecules of oxygen gas (O2)?

    <p>6.0 × 10^23</p> Signup and view all the answers

    Which of the following compounds contains the highest number of anions per mole?

    <p>1 mol of Na3P</p> Signup and view all the answers

    Calculate the percentage by mass of oxygen in Pb(NO3)2.

    <p>29.0%</p> Signup and view all the answers

    How many protons, neutrons, and electrons are present in 238U+5?

    <p>92, 146, 87</p> Signup and view all the answers

    Which of the following molecular formulas represents the carbohydrate described (40.0% C, 6.71% H, 53.3% O)?

    <p>C5H10O5</p> Signup and view all the answers

    Which of the following options states the average atomic mass of element X with the isotopes given?

    <p>220.4 amu</p> Signup and view all the answers

    What is the percent composition of carbon by mass in sucrose (C12H22O11)?

    <p>26.7%</p> Signup and view all the answers

    Which of the following substances has the smallest number of protons?

    <p>Hydrogen</p> Signup and view all the answers

    Study Notes

    Exam Instructions

    • Do not open the exam until told to do so.
    • Place your ID, pencils, erasers, and calculator on your desk.
    • Place all other items out of sight.
    • Verify the form number on the Scantron and exam packet match.
    • Write your last name, first name, and ID number on the Scantron.
    • Write "CHE 131" under Course Name.
    • Submit all Scantrons by 9:35 pm.
    • Record all answers on the Scantron and in the exam packet.
    • Check that all exam pages (including the Periodic Table and conversions) are present.
    • Show your ID and sign in on the attendance sheet.

    General Chemistry Policies

    • Possession of cell phones, digital devices, or unauthorized materials results in a grade of 0, a report to Academic Judiciary, and a possible F for the course.
    • If you do not have an ID to verify your identity, see Dr. Ivarson the day after the exam and show a valid ID.

    Conversion Factors, Constants, and Equations (Page 3)

    • Includes conversion factors for mass, temperature, length, and volume.
    • Provides physical and chemical constants (e.g., electron mass, Avogadro's number, gas constant).
    • Lists equations for energy, heat, and pressure.
    • Provides values for standard thermodynamic conditions (e.g., STP).

    Periodic Table (Page 4)

    • Contains a standard periodic table, including atomic number, symbol, and atomic weight for all elements.

    Multiple Choice Questions (Page 5)

    • Exam-style questions assessing understanding of fundamental concepts like formula, stoichiometry, and basic chemistry calculations (empirical formula).
    • Covers topics such as chemical quantities, isotopes, conversions, and dimensional analysis.

    Additional Questions (Pages 6-7)

    • Additional chemistry questions, providing further practice on concepts including data analysis, significant figures, molecular weight problems, formula determination, and others.
    • Covers topics like mass percentage, chemical calculations, and identification of elements with their properties.

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    CHE 131 Exam 1 Fall 2024 PDF

    Description

    Test your knowledge on essential exam protocols and chemical calculations with this quiz. Topics include verification procedures, handling unauthorized materials, and empirical formulas. This quiz also covers specific chemical concepts such as molecular weight and density calculations.

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