Stem 9 Practice Final

67 Questions | Total Attempts: 36

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Stem 9 Practice Final

Sit back, relax and have fun with this Physical Science Practice quiz.


Questions and Answers
  • 1. 
    Which of the following units is an SI base unit?
    • A. 

      Centimeter

    • B. 

      Kilogram

    • C. 

      Cubic meter

    • D. 

      Liter

  • 2. 
    In a controlled experiment,
    • A. 

      The outcome is controlled.

    • B. 

      Results are obtained by computer models.

    • C. 

      One variable is fixed while all others are changed.

    • D. 

      One variable is changed while all others remain fixed.

  • 3. 
    Matter is
    • A. 

      Any visible solid that has mass.

    • B. 

      Any liquid that takes up space and has mass.

    • C. 

      Anything that takes up space and has mass.

    • D. 

      Any liquid or solid that takes up space.

  • 4. 
    What i the chemical formula for iron (III) oxide?
    • A. 

      Fe2+

    • B. 

      NaCl

    • C. 

      I2

    • D. 

      Fe2O3

  • 5. 
    Which of the following is a mixture?
    • A. 

      Air

    • B. 

      Salt

    • C. 

      Water

    • D. 

      Sulfur

  • 6. 
    Compounds and elements are
    • A. 

      Always solids.

    • B. 

      Mixtures.

    • C. 

      Pure substances.

    • D. 

      Dense.

  • 7. 
    Which of the following is a physical change?
    • A. 

      Melting ice cubes

    • B. 

      Burning paper

    • C. 

      Rusting iron

    • D. 

      Burning gasoline

  • 8. 
    If you add oil to water and shake the two liquids together, you will form a
    • A. 

      Heterogeneous mixture.

    • B. 

      Homogeneous mixture.

    • C. 

      Miscible liquid.

    • D. 

      Pure substance.

  • 9. 
    During which change of state do atoms or molecules become more ordered?
    • A. 

      Boiling

    • B. 

      Condensation

    • C. 

      Melting

    • D. 

      Sublimation

  • 10. 
    Which of the following describes what happens as the temperature of a gas in a balloon increases?
    • A. 

      The volume of the gas increases and the speed of the particles in increases.

    • B. 

      The speed of the particles decreases.

    • C. 

      The volume decreases.

    • D. 

      The pressure decreases.

  • 11. 
    Materials that can flow to fit their containers include
    • A. 

      Gases.

    • B. 

      Liquids.

    • C. 

      Both gases and liquids.

    • D. 

      Neither gases or liquids.

  • 12. 
    Which statement is NOT true of Bohr's model of the atom?
    • A. 

      The nucleus can be compared to the sun.

    • B. 

      Electrons orbit the nucleus.

    • C. 

      An electron's path is not known exactly.

    • D. 

      Electrons exist in energy levels.

  • 13. 
    According to the moderns model of the atom,
    • A. 

      Moving electrons form an electron cloud.

    • B. 

      Electrons and protons circle neutrons.

    • C. 

      Neutrons have a positive charge.

    • D. 

      The number of protons an atom has varies.

  • 14. 
    If an atom has a mass of 11 amu and contains five electrons, it's atomic number must be
    • A. 

      55.

    • B. 

      16.

    • C. 

      6.

    • D. 

      5.

  • 15. 
    Which statement about atoms of elements in the same group of the periodic table is true?
    • A. 

      They have the same number of protons.

    • B. 

      They have the same mass number.

    • C. 

      They have similar chemical properties.

    • D. 

      They have the same number of total electrons.

  • 16. 
    The majority of elements in the periodic table are
    • A. 

      Nonmetals.

    • B. 

      Conductors.

    • C. 

      Synthetic.

    • D. 

      Noble gases.

  • 17. 
    An atom of which of the following elements is unlikely to form a positively charged ion?
    • A. 

      Potassium, K

    • B. 

      Selenium, Se

    • C. 

      Barium, Ba

    • D. 

      Silver, Ag

  • 18. 
    Which of the following statements about krypton is NOT true?
    • A. 

      Its molar mass is 83.79 g/mol Kr.

    • B. 

      Its atomic number is 36.

    • C. 

      One mole of krypton atoms has a mass of 41.90 g.

    • D. 

      It is a noble gas.

  • 19. 
    Compounds are different from mixtures because
    • A. 

      Compounds are held together by chemical bonds.

    • B. 

      Each substance in a compound maintains its own properties.

    • C. 

      Each original substance in a compound remains chemically unchanged.

    • D. 

      Mixtures are held together by chemical bonds.

  • 20. 
    Which substance has ionic bonds?
    • A. 

      CO

    • B. 

      CO2

    • C. 

      KCl

    • D. 

      O2

  • 21. 
    In an exothermic reaction,
    • A. 

      Energy is conserved.

    • B. 

      The formation of bonds in the product releases more energy than is required to break the bonds in the reactants.

    • C. 

      Energy is released as bonds form.

    • D. 

      All of the above.

  • 22. 
    Which of the following is a homogeneous mixture?
    • A. 

      Tossed salad

    • B. 

      Soil

    • C. 

      Salt water

    • D. 

      Vegetable soup

  • 23. 
    A solution is _________ if it contains as much dissolved solute as it will hold under a given set of  conditions.
    • A. 

      Saturated.

    • B. 

      Dilute.

    • C. 

      Supersaturated.

    • D. 

      Concentrated

  • 24. 
    Gases are more soluble in liquids when the pressure is __________ and the temperature is _________.
    • A. 

      High, high

    • B. 

      High, low

    • C. 

      Low, high

    • D. 

      Low, low

  • 25. 
    Which ions does an acid form in solution?
    • A. 

      Oxygen

    • B. 

      Hydronium

    • C. 

      Hydroxide

    • D. 

      Sulfur

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