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Thermal Energy in Chemical Reactions

Quiz by Nussbaum, Marjorie (DCPS)

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37 questions
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  • Q1
    When food is placed in a refrigerator it cools. Is this an endothermic reaction?
    no, because it is an exothermic reaction
    no, because there is no chemical change happening
    yes, because the heat from the food is removed by the refrigeration system and put into the outside air
    yes, because cooling causes a chemical change in the food
    30s
  • Q2
    Thermal energy is transferred from _______________________ to ______________________.
    areas of lower energy...areas of higher energy
    areas of higher energy...areas of lower energy
    areas of cold...areas of warm
    areas of less molecular movement...areas of more molecular movement
    30s
  • Q3
    In a chemical reaction, energy is needed to
    complete the reaction
    start the reaction
    assemble the new products
    break and form the chemical bonds between the atoms
    30s
  • Q4
    Which statement about atoms and molecules is correct?
    Atoms are the smallest particles of matter that retain all the characteristics of that matter and molecules are built from atoms
    When molecules bond with other molecules atoms are produced
    If a type of matter is made of molecules, it is an element
    Molecules are the smallest particles of matter that retain all the characteristics of that matter and atoms are built from atoms
    30s
  • Q5
    Endothermic reactions occur when
    all of these answers
    the reaction produces heat
    more energy is stored in the bonds of the products than was present in the reactants
    the reaction produces precipitates
    30s
  • Q6
    Exothermic reactions occur when
    more energy is released as the chemical bonds are broken and reformed than is needed to maintain the reaction
    more energy is stored in the bonds of the products than were present in the reactants
    the bonds that hold chemicals together are formed
    the bonds that hold chemicals together are broken
    30s
  • Q7
    We can tell that a chemical reaction has occurred by
    a change in color
    a change in temperature
    any of these can indicate that a chemical reaction has occurred
    a change in appearance
    30s
  • Q8
    Hand warmers use what kind of reaction to produce heat?
    exothermic
    chemical
    physical
    endothermic
    30s
  • Q9
    The source of the thermal energy [heat] that is given off during an exothermic reaction is
    the energy released when the reactant bonds are broken
    the energy released when the reactants form new products
    energy is released from all of these options
    the energy released when the product bonds are broken
    30s
  • Q10
    During photosynthesis, plants store energy from _________________ as ____________________.
    the air/carbohydrates
    warm water/sugars
    the soil/sugars
    sun/carbohydrates
    30s
  • Q11
    Precipitates are
    liquid substances formed when two or more solid substances are combined
    types of reactants that form solids
    solid substances formed when liquid substances are combined
    solid substances that can be combined chemically
    30s
  • Q12
    What are the ingredients for photosynthesis?
    water/soil/photons
    water/nitrogen/sunlight
    carbon dioxide/sunlight/ hydrogen
    water/carbon dioxide/photons
    30s
  • Q13
    Suppose you were shown a graph showing the temperature change over time in a chemical reaction. The graph shows a upward line as time elapses [goes past]. What kind of reaction is this?
    endothermic
    it could be any type of reaction
    exothermic
    chemical bonding
    30s
  • Q14
    Energy cannot be
    translated
    destroyed
    transferred
    transformed
    30s
  • Q15
    A reactant is
    one of the chemicals that is produced in a chemical reaction
    one of the chemicals that is combined in a chemical reaction
    one of the chemicals that is produced in an exothermic chemical reaction
    one of the chemicals that is produced in an endothermic chemical reaction
    30s

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