Chemistry Exam 3

50 Questions | Total Attempts: 304

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Chemistry Exam 3

Questions and Answers
  • 1. 
    Which of the following activities require energy?
    • A. 

      Walking

    • B. 

      Cell repair

    • C. 

      Breathing

    • D. 

      Studying

    • E. 

      All of the above require energy

  • 2. 
    Coefficients are important components of chemical equations. What is the significance of coefficient in a chemical equation? I. Coefficients indicated the ratio of masses of molecules. II. Coefficients indicate the ratio of numers of atoms and molecules. III. Coefficients indicate the ratio or numbers of moles of molecules and atoms.
    • A. 

      III only

    • B. 

      I and II

    • C. 

      II and III

    • D. 

      I only

    • E. 

      II only

  • 3. 
    A blood sample has a pH of 7.42. What is the concentration of hydroxide in this solution?
    • A. 

      3.80 x 10^-8 M

    • B. 

      0.870 M

    • C. 

      2.63 x 10^-7 M

    • D. 

      -2.63 x 10^7 M

    • E. 

      3.80 x 10^8 M

  • 4. 
    The blanaced chemical equation for the combustion of propane (C3H8) is given below. How many grams of carbon dioxide (CO2) are released when 35g of propane are burned in the presence of excess oxygen? (C3H8) + 5(O2)   -->   3(CO2) + 4(H2O)
    • A. 

      0.80 g

    • B. 

      12 g

    • C. 

      35 g

    • D. 

      105 g

    • E. 

      1500 g

  • 5. 
    Which of the following biological molucules are the major nutrients that make up the food that we eat? I. proteins II. nucleic acids III. steroids IV. fats V. carbohydrates
    • A. 

      All of these are major nutrients.

    • B. 

      I, II, IV, and V

    • C. 

      I and V

    • D. 

      III, IV, and V

    • E. 

      I, IV, and V

  • 6. 
    In the body, glucose is broken down in the presence of oxygen into carbon dioxide and water. The balanced chemical equation for this reaction is shown below. According to this equation, how many molecules of carbon dioxide are produced when three molecules of glucose are metabolized in the presence of excess oxygen? (C6H12O6) + (O2)   -->   6(CO2) + 6(H2O)
    • A. 

      18

    • B. 

      24

    • C. 

      6

    • D. 

      12

    • E. 

      0

  • 7. 
    Which of the following statements about acids in NOT true?
    • A. 

      An acid increases the concentration of hydroxide in solution.

    • B. 

      An acid is a proton donor.

    • C. 

      An acid increases the concentration of hydrnium in solution.

    • D. 

      An example of an acid is HBr.

    • E. 

      An acid increases the concentration of protons in solution.

  • 8. 
    Not all protons in a molecule can be donated in an acid-base reaction. Below are three molecules, each with the proton donated in an acid-base reaction circled. What do these protons have in common?
    • A. 

      They are the only hydrogens in the molecule.

    • B. 

      They are all attached to the most electronegative atom in the molecule.

    • C. 

      The are all attached to oxygen.

    • D. 

      They are all attached to carbon.

    • E. 

      They are all in a carbon-containing molecule.

  • 9. 
    Each of the following figures represents a reaction. Which reaction has the fastest rate?
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

    • E. 

      E

  • 10. 
    Which of the following diagrams illustrates an endothermic reaction? I. II. III.
    • A. 

      II only

    • B. 

      I and II

    • C. 

      I and III

    • D. 

      II and III

    • E. 

      I only

  • 11. 
    What is the IUPAC name of the following molecule?
    • A. 

      2,3-dimethyl-4-pentanol

    • B. 

      1,2,3,3-tetramethyl-1-propanol

    • C. 

      1,2,3-trimethyl-1-butanol

    • D. 

      2,3,4-trimethyl-4-butanol

    • E. 

      3,4-dimethyl-2-pentanol

  • 12. 
    Which part of the following energy diagram is changed when a catalyst is added, and how is it changed?
    • A. 

      I is lower.

    • B. 

      I is higher.

    • C. 

      II is higher.

    • D. 

      II is lower.

    • E. 

      III is higher.

  • 13. 
    What is the pH of a solution with a [H20^6] of 1.26 x 10^-4 M?
    • A. 

      3.90

    • B. 

      10.1

    • C. 

      -3.90

    • D. 

      11.9

    • E. 

      -10.1

  • 14. 
    What is the pH of a solution with a [-OH] of 4.1 x 10^-3 M?
    • A. 

      -11.6

    • B. 

      -2.39

    • C. 

      7.00

    • D. 

      11.6

    • E. 

      2.39

  • 15. 
    What are biological catalysts called?
    • A. 

      Lipids

    • B. 

      Carbohydrates

    • C. 

      Proteins

    • D. 

      Enzymes

    • E. 

      Nucleic acids

  • 16. 
    Which statement best describes how the termperature of the surroundings change as a result of the reaction represented by this diagram?
    • A. 

      The temperature of the surroundings decreases.

    • B. 

      The surroundings will become very cold.

    • C. 

      The temperature of the surroundings increases.

    • D. 

      The temperature of the surrounding does not change.

    • E. 

      It is not possible to predict anything about the temperature of the surroundings based on this diagram.

  • 17. 
    The enthalpy for the reaction described by this diagram is __________.
    • A. 

      Less than zero

    • B. 

      Exactly zero

    • C. 

      Very large

    • D. 

      Greater than zero, but not necessarily very large

    • E. 

      It is not possible to predict anything about the enthalpy of this equation.

  • 18. 
    Which statement best describes how aldehydes, ketones and carboxylic acids are similar?
    • A. 

      They are constitutional isomers.

    • B. 

      They all contain carbonyl groups.

    • C. 

      They all contain hydroxyl groups.

    • D. 

      They are geometric isomers.

    • E. 

      They are conformers.

  • 19. 
    Which statement best describes the purpse of ATP in the cell?
    • A. 

      It is part of the cell membrane.

    • B. 

      It is the energy currency of the cell.

    • C. 

      It is a protein.

    • D. 

      It is a catalyst, speeding up the rate of chemical reactions.

    • E. 

      It is a component of the genetic material in the cell.

  • 20. 
    Which of the following substances are present at equilibrium.
    • A. 

      Only ammonia and water are present at equilibrium.

    • B. 

      Only hydroxide and hydronium are present at equilibrium.

    • C. 

      Ammonia, water, ammonium, and hydroxide are all present at equilibrium.

    • D. 

      It is not possible to say which molecules will be present at equilibrium.

    • E. 

      Only ammonium and hydroxide are present at equilibrium.

  • 21. 
    Which of the following statements best describes the concentration of ammonia and ammonium at equilibrium?
    • A. 

      Their concentrations are constant.

    • B. 

      There is no ammonia at equilibrium.

    • C. 

      There is no ammonium at equilibrium.

    • D. 

      Their concentrations are equal. (If you choose this answer you DO NOT understand the concept of equilibrium.) /cry

    • E. 

      The concentration of ammonium is increasing.

  • 22. 
    Which of the following organic molecules contains at lease one functional group?
    • A. 

      All of these molecules contain at lease one functional group.

    • B. 

      All of these molecules except I contain at lease one functional group.

    • C. 

      Molecules II, III, and IV contain at least one functional group.

    • D. 

      Only molecules III and IV contain a functional group.

    • E. 

      None of these molecules contain a functional group.

  • 23. 
    One serving (45 g) of dry wild rice contains 1.5 g of fat, 35 g of carbohydrates, and 5 g of protein. How many Calories does a serving of wild rice contain?
    • A. 

      166 Calories

    • B. 

      170 Calories

    • C. 

      200 Calories

    • D. 

      340 Calories

    • E. 

      370 Calories

  • 24. 
    What do all bases have in common?
    • A. 

      They contain an -OH group.

    • B. 

      They contain a nitrogen.

    • C. 

      They contain an oxygen.

    • D. 

      They are all salts.

    • E. 

      They contain a nonbonding pair of electrons.

  • 25. 
    Which of the following statements does NOT describe how functional groups are used in organic chemistry?
    • A. 

      Functional groups are used to organize and classify organic molecules.

    • B. 

      Functional groups are used to predict reactivity of molecules.

    • C. 

      Functional groups are used to predict physical properties of molecules.

    • D. 

      Functional groups are used in naming organic molecules.

    • E. 

      Functional groups are used to determine the natural abundance of a molecule.

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