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Changes in Energy at the Molecular Level TEST REVIEW

Quiz by Nussbaum, Marjorie (DCPS)

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32 questions
Show answers
  • Q1
    When thermal energy is subtracted from a solid
    it turns to a gas
    it freezes
    it remains a solid but its temperature becomes colder
    it turns to a liquid
    30s
  • Q2
    Why do ice cubes melt when placed in room temperature soda?
    the thermal energy in the soda is transferred to the ice, thus raising its temperature
    The potential energy in the soda is transferred to the ice and causes melting
    they lose their coldness to the surrounding soda
    they are warmed by the carbonation in the soda
    30s
  • Q3
    The best definition for the term condensation is
    the transformation of a substance from gas to liquid
    the vaporization of a liquid
    the accumulation of liquid water on a surface as water vapor in the air is cooled
    the reduction in volume of a liquid due to the escape of molecules from the liquid
    30s
  • Q4
    Which of the choices below best describes what happens when equal amounts of hot and cold water are combined?
    the coldness is transferred from the cold liquid to the hot liquid
    the hot liquid heats the cold liquid
    the hot liquid heats the cold liquid
    thermal energy from the hot liquid is transferred to the molecules of the cold liquid
    30s
  • Q5
    When cookies are baked, what makes them rise and get puffy?
    a chemical reaction involving the sugars and proteins
    the leavening agent sodium carbonate [baking powder] + heat
    the leavening agent sodium carbonate [baking powder] + thermal expansion of the moisture in the butter
    the expansion of the cookie dough
    30s
  • Q6
    Thermal energy can only be transferred
    from right to left
    from left to right
    from cold to hot
    from hot to cold
    30s
  • Q7
    Dry ice is
    none of the answers given are correct
    the solid form of carbon dioxide
    the solid form of water
    a kind of gas
    30s
  • Q8
    As heat is added to a liquid substance held in a closed container, the molecules of that substance move faster, creating
    solid
    pressure
    radiation
    combustion
    30s
  • Q9
    An example of something that has kinetic energy would be
    water in the Anacostia River
    all of these demonstrate kinetic energy
    a book on a shelf
    an ice cube in a freezer
    30s
  • Q10
    Liquids can be poured because
    the molecules in liquids are very far apart, allowing them to flow freely
    the molecules in liquids repel each other giving them the ability to slide past each other
    the molecules in liquids are just far apart enough to allow them to slide past each other
    the molecules in all liquids are slippery
    30s
  • Q11
    As pressure in a closed system increases, what happens to the temperature?
    it drops
    it depends on the substance in the closed system
    it increases
    there is no change
    30s
  • Q12
    The four states of matter DO NOT include
    plasma
    heat
    liquid
    solid
    30s
  • Q13
    As thermal energy in an object increases
    the molecules in the object become farther apart from one another
    the molecules in the object speed up
    the temperature rises in the object
    all of these answers are correct
    30s
  • Q14
    In an experiment, 500 mL of 90 degree celsius water is mixed with 500 mL of 10 degree celsius water. What formula should be used to calculate the temperature of the mixed water?
    cold starting temperature + hot starting temperature divided by 2 = ending temperature
    average starting kinetic energy of the cold water + average starting kinetic energy of the hot water divided by 2 = ending temperature
    cold starting temperature + hot starting temperature divided by 4 = ending temperature
    average starting potential energy of the cold water + average starting potential energy of the hot water divided by 2 = ending temperature
    30s
  • Q15
    When thermal energy is subtracted from a solid
    it turns to a liquid
    it remains a solid but its temperature becomes colder
    it turns to a gas
    it freezes
    30s

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