Chemistry Final

163 Questions | Total Attempts: 22

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Chemistry Final

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Questions and Answers
  • 1. 
    Why study chemistry?
    • A. 

      To help us inform us about our world

    • B. 

      To be better able to make informed decisions

    • C. 

      To help us learn a technique for identifying and solving problems

    • D. 

      All of these choices

  • 2. 
    The science of chemistry may involve:
    • A. 

      Observation

    • B. 

      Hypothesis development

    • C. 

      Experimentation

    • D. 

      All of these choices

  • 3. 
    A tentative explanation of certain facts that provides the basis for further experimentation is a(n)
    • A. 

      Observation

    • B. 

      Hypothesis

    • C. 

      Theory

    • D. 

      Law

  • 4. 
    A well established hypothesis is often called a(n)
    • A. 

      Observation

    • B. 

      Fact

    • C. 

      Theory

    • D. 

      Law

  • 5. 
    Which of the following is a "pure" substance?
    • A. 

      Tap water

    • B. 

      Coca Cola

    • C. 

      Sea water

    • D. 

      Water

  • 6. 
    Which has both a definite shape and definite volume?
    • A. 

      Solid

    • B. 

      Vapor

    • C. 

      Gas

    • D. 

      Liquid

  • 7. 
    Which of the following is a pure substance existing as different phases in heterogeneous system?
    • A. 

      Salt dissolved in water

    • B. 

      Flour suspended in water

    • C. 

      Cork floating in water

    • D. 

      Ice floating in water

  • 8. 
    Which of the following is a pure substance?
    • A. 

      Table salt

    • B. 

      Bronze

    • C. 

      Air

    • D. 

      Soil

  • 9. 
    Your lab instructor gives you a red solid and tells you that it is a pure substance. Which of the following statements is true given this information?
    • A. 

      The solid has a fixed composition by mass

    • B. 

      The solid is a compound

    • C. 

      The solid cannot be decomposed into simpler substances

    • D. 

      The solid cannot be melted

  • 10. 
    A key feature of the scientific method is to design and perform experiments to test hypotheses.
    • A. 

      True

    • B. 

      False

  • 11. 
    Matter always has both mass and occupies space.
    • A. 

      True

    • B. 

      False

  • 12. 
    A liquide has a definite shape and a definite volume
    • A. 

      True

    • B. 

      False

  • 13. 
    Gas molecules try to fill most of the volume of their container.
    • A. 

      True

    • B. 

      False

  • 14. 
    Which of the following is the Si prefix that means 1000?
    • A. 

      Milli

    • B. 

      Centi

    • C. 

      Deci

    • D. 

      Kilo

  • 15. 
    The number, 14.74999, when rounded to three digits is
    • A. 

      15.0

    • B. 

      14.8

    • C. 

      14.7

    • D. 

      10.0

  • 16. 
    How many significant figures are in the number 1.500
    • A. 

      1

    • B. 

      2

    • C. 

      3

    • D. 

      4

  • 17. 
    One kilometer is equal to 
    • A. 

      0.001 m

    • B. 

      0.01 m

    • C. 

      100 m

    • D. 

      1000 m

  • 18. 
    The prefixes nano and mega correspond to which of the following pair, respectively?
    • A. 

      10^9 and 10^6

    • B. 

      10^6 and 10^-9

    • C. 

      10^-9 and 10^6

    • D. 

      10^-9 and 10^9

  • 19. 
    A temperature of 100. K is equal to which Celsius temperature?
    • A. 

      -173 C

    • B. 

      -137 C

    • C. 

      237 C

    • D. 

      273 C

  • 20. 
    A piece of metal has a mass of 245 mg and volume of 15.3 mL. What is its density?
    • A. 

      16.0 g/cm^3

    • B. 

      0.0160 g/cm^3

    • C. 

      16013 g/cm^3

    • D. 

      3.75x103 g/cm^3

  • 21. 
    A solid substance has a density of 4.36g/mL. What is the volume of 30.0 g of this substance?
    • A. 

      0.145 mL

    • B. 

      6.88 mL

    • C. 

      34. 36 mL

    • D. 

      131 mL

  • 22. 
    Multiply (40.36 ) by (37.40). The product expressed to the proper number of significant figures is
    • A. 

      151

    • B. 

      1509

    • C. 

      1510

    • D. 

      1509.464

  • 23. 
    Divide 1436 by 203. The quotient expressed to the proper number of significant figures is 
    • A. 

      0.141

    • B. 

      0.1414

    • C. 

      7.07

    • D. 

      7.074

  • 24. 
    Add 114.32 + 12.1 + 13. The sum expressed to the proper number of significant figures is
    • A. 

      139

    • B. 

      139.4

    • C. 

      139.42

    • D. 

      140

  • 25. 
    Subtract 14.3 from 130.670. The difference expressed to the correct number of significant figures is
    • A. 

      116

    • B. 

      116.3

    • C. 

      116.4

    • D. 

      116.37