Chemistry Practice Midterm Part 1

40 Questions

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Chemistry Practice Quizzes & Trivia

This 'quiz' is to help prepare introductory chemistry students for their first midterm.


Questions and Answers
  • 1. 
    Which branch of chemistry focuses on compounds with carbon?
    • A. 

      Inorganic

    • B. 

      Organic

    • C. 

      Analytical

    • D. 

      Biochemistry

  • 2. 
    Which of the following is not a step of the scientific method?
    • A. 

      Hypothesis

    • B. 

      Conclusion

    • C. 

      Observations

    • D. 

      Graphing

  • 3. 
    What is the goal of the scientific method?
    • A. 

      To prove the hypothesis correct.

    • B. 

      To find a conclusion that you want.

    • C. 

      To explore and test a hypothesis in order to find a conclusion.

    • D. 

      To create a new theory.

  • 4. 
    Which of the following is correct about ozone?
    • A. 

      It shields plants and animals from harmful UV rays.

    • B. 

      It is located in the stratosphere.

    • C. 

      It is made around the equator.

    • D. 

      All of the above is correct.

  • 5. 
    Covert 4.0 x 103 kilometers to millimeters
    • A. 

      4.0 x 10^3 mm

    • B. 

      4.0 mm

    • C. 

      4.0 x 10^9 mm

    • D. 

      4.0 x 10^-3 mm

  • 6. 
    Which of the following is not true about the rules of graphing?
    • A. 

      The independent variable goes on the x axis.

    • B. 

      The dependent variable goes on the x axis.

    • C. 

      Titles should be written as y vs. x.

    • D. 

      The dependent variable is on the y axis.

  • 7. 
    When recording data for a experiment or measurement you should always....
    • A. 

      Record every value you know with certainty.

    • B. 

      Wait to write down numbers until the calculations are finished.

    • C. 

      Count significant digits.

    • D. 

      Record every value you know with certainty plus one estimated digit.

  • 8. 
    Which of the following conversions is correct?
    • A. 

      1000 cm^3 = 1 liter

    • B. 

      1 dm^3 = 100 ml

    • C. 

      1 cm^3 = 100 ml

    • D. 

      They are all incorrect.

  • 9. 
    What is an extensive property?
    • A. 

      A form of qualitative data.

    • B. 

      A property that depends upon the amount of a substance.

    • C. 

      A property that doesn't depend upon the amount of a substance.

    • D. 

      A chemical property that depends upon an external variable.

  • 10. 
    Which of the following are a physical changes?
    • A. 

      Leaves changing colors in the fall.

    • B. 

      Dry ice subliming into CO2.

    • C. 

      Copper turning green in moist air.

    • D. 

      Fruit ripening.

  • 11. 
    Which of the following are chemical changes?
    • A. 

      An explosion

    • B. 

      Iron rusting.

    • C. 

      Frying an egg.

    • D. 

      All the above are chemical changes.

  • 12. 
    Which of the following are considered a homogeneous mixture?
    • A. 

      Salad

    • B. 

      Vegetable soup

    • C. 

      Water

    • D. 

      Alloy

  • 13. 
    How do the properties of a compound relate to the properties of the elements that comprise it?
    • A. 

      The properties of the individual elements do not determine the properties of the compound.

    • B. 

      The element that is most abundant determines the properties of the compound.

    • C. 

      It depends if the ratio is 50/50; if it is, the properties of the compound will be equally shared from the elements.

    • D. 

      The properties of the compound will that of one of the elements. We just don't know which one.

  • 14. 
    What was discovered from the cathode ray tube?
    • A. 

      Protons

    • B. 

      Electrons

    • C. 

      Neutrons

    • D. 

      Atoms

  • 15. 
    What ratio makes an atom neutral?
    • A. 

      1:1 ratio of protons to neutrons

    • B. 

      1:1 ratio of electrons to neutrons

    • C. 

      1:1 ratio of protons to electrons

    • D. 

      None of these. It depends upon the protons only.

  • 16. 
    What ratio makes an atom most stable?
    • A. 

      1:1 ratio of protons to neutrons

    • B. 

      1:1 ratio of electrons to neutrons

    • C. 

      1:1 ratio of protons to electrons

    • D. 

      None of these. It depends upon the protons only.

  • 17. 
    What are isotopes?
    • A. 

      A charged atom that has gained or lost an electron.

    • B. 

      An atom that has a different number of protons.

    • C. 

      An atom that has a different number of neutrons.

    • D. 

      An atom that has a different number of electrons.

  • 18. 
    Which relationship is true?
    • A. 

      Wavelength increases as frequency decreases.

    • B. 

      Wavelength increases as frequency increases.

    • C. 

      Energy increases as frequency decreases.

    • D. 

      Energy decreases as wavelength decreases.

  • 19. 
    What do the joules measure?
    • A. 

      Atomic radius

    • B. 

      Energy

    • C. 

      Wavelength

    • D. 

      Frequency

  • 20. 
    What is the SI for frequency?
    • A. 

      Meters

    • B. 

      Joules

    • C. 

      Seconds

    • D. 

      Hertz

  • 21. 
    Which of the following is true about atomic emission spectra?
    • A. 

      It shows all the colors of the rainbow and therefore all visible wavelengths.

    • B. 

      Each element produces a unique sequence of bright lines.

    • C. 

      It is produced when atoms absorb energy.

    • D. 

      All of the above it correct.

  • 22. 
    How many valence electrons are in the following configuration?[Ar] 4s2 3d10 4p4
    • A. 

      2

    • B. 

      10

    • C. 

      4

    • D. 

      6

  • 23. 
    What is the octet rule?
    • A. 

      An atom will gain, lose or share electrons to achieve 8 valence electrons.

    • B. 

      The maximum number of valence electrons an atom can have is 8.

    • C. 

      Chemical properties repeat every 8 elements.

    • D. 

      None of the above are correct.

  • 24. 
    • A. 

      D and E

    • B. 

      B and G

    • C. 

      A and H

    • D. 

      C and F

  • 25. 
    The control in the experiment....
    • A. 

      Is always held constant.

    • B. 

      Is the same as the dependent variable.

    • C. 

      Is the standard for comparison.

    • D. 

      Is the independent variable.

  • 26. 
    Which of the following are a qualitative observation?
    • A. 

      Temperature

    • B. 

      Time

    • C. 

      Volume

    • D. 

      Color

  • 27. 
    Which of the following are quantitative measurements?
    • A. 

      Color

    • B. 

      Mass

    • C. 

      Texture

    • D. 

      Odor

  • 28. 
    In an experiment a student changes the temperature of water in order to measure the solubility of salt in water at different temperatures.  The temperature is raised in 5 degree increments and salt is measured and added until it no longer dissolves.  What is the independent variable? Dependent variable and control (in order)? 
    • A. 

      Temperature, amount of water, amount of salt.

    • B. 

      Amount of water, amount of salt, temperature.

    • C. 

      Temperature, amount of salt, amount of water

    • D. 

      Amount of salt, temperature, amount of water

  • 29. 
    What is density?
    • A. 

      The amount of matter in an object.

    • B. 

      The amount of matter with the affect of gravity.

    • C. 

      The amount of matter contained in mass

    • D. 

      None of these.

  • 30. 
    How many significant figures are in the following number:0.002400500
    • A. 

      9

    • B. 

      8

    • C. 

      7

    • D. 

      6

  • 31. 
    How many significant figures are in the following number: 4500
    • A. 

      1

    • B. 

      2

    • C. 

      3

    • D. 

      4

  • 32. 
    An experiment yields data that a solution has a density of .84 g/ml.   The accepted value is .90 g/ml.  What is the error of this density measurement?
    • A. 

      .06 g/ml

    • B. 

      - .06 g/ml

    • C. 

      .07 g/ml

    • D. 

      -.07 g/ml

  • 33. 
    • A. 

      - 10 %

    • B. 

      .10 %

    • C. 

      15%

    • D. 

      -.15 %

  • 34. 
    What is the correct sum of the following numbers with significant figures:12.345 + 8.67 + 31.021
    • A. 

      52.036

    • B. 

      52.03

    • C. 

      52.04

    • D. 

      52.0

    • E. 

      52.

  • 35. 
    • A. 

      1876.8

    • B. 

      1877

    • C. 

      1880

    • D. 

      1900

  • 36. 
    What is the product of 2.4 x 103 cm and 4.32 x 102 m?
    • A. 

      1.04 x 10^8 cm2

    • B. 

      1.04 x 10^5 m2

    • C. 

      1.04 x 10^4 m2

    • D. 

      1.0 x 10^8 cm2

  • 37. 
    Which of the following is an intensive property?
    • A. 

      Volume

    • B. 

      Density

    • C. 

      Mass

    • D. 

      Length

  • 38. 
    What is sublimation?
    • A. 

      The process of a liquid becoming a gas.

    • B. 

      The process of a solid becoming a gas.

    • C. 

      The process of a solid becoming a liquid.

    • D. 

      The process of a liquid becoming a solid.

  • 39. 
    • A. 

      Carbon dioxide

    • B. 

      Salt water

    • C. 

      Tin

    • D. 

      Salad

  • 40. 
    Which of the following separation techniques is used to separate a heterogeneous mixture?
    • A. 

      Crystallization

    • B. 

      Distillation

    • C. 

      Chromatography

    • D. 

      Filtration