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Student Interview Answers by osq14347

VIEWS: 4 PAGES: 10

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Student Interview Answers (KBS)
Probes about individual events

Cards showing events:
  Corn plants growing in the sunlight (photosynthesis)
  A child running (cellular respiration)
  A car climbing a hill (combustion)
  A tree decaying (decomposition, cellular respiration)

Ask questions about each card:
   Structure: Molecular composition of the organic substances – To what extent, can the student identify organic carbon?
   Tracing matter: Chemical Reaction – To what extent, can the student identify gas as reactants/products in the reaction
   and/or identify carbon transformation?
   Tracing energy: Energy sources; transformation; dissipation – heat)

Corn plants growing in the sunlight
  Structure:
   Can you identify any of the substances or materials that are changing during this event? What are they?
   Do any of the substances you named contain carbon? What are they?
  Process:
   Will this process change the weight of the corn plants?
   What happens to the materials you identified during this event? How do they change?
   Does this event change the air? How? What is in the air that does not change?
   Does this event produce any new materials? What are they? Where do they come from? How are they formed?
   How are the atoms and molecules changing in the materials that you identified?
  Energy:
   Does this event involve energy?
   Can you identify an energy source for this event? What is it?
   Why is it important for the corns to have sunlight?
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     What happens to the energy from sunlight?
     Where does the energy go when the event ends? Can the energy be used again? Why or why not?

A child running
  Structure:
   Can you identify any of the substances or materials that are changing during this event? What are they?
   Do any of the substances you named contain carbon? What are they?
  Process:
   Will this process change the weight of the child?
   What happens to the materials you identified during this event? How do they change?
   Does this event change the air? How? What is in the air that does not change?
   Does this event produce any new materials? What are they? Where do they come from? How are they formed?
   How are the atoms and molecules changing in the materials that you identified?
  Energy:
   Does this event involve energy?
   Can you identify an energy source for this event? What is it?
   Why is it important for the runner to eat food?
   What happens to the energy from runner?
   Where does the energy go when the event ends? Can the energy be used again? Why or why not?

A car climbing a hill
  Structure:
   Can you identify any of the substances or materials that are changing during this event? What are they?
   Do any of the substances you named contain carbon? What are they?
  Process:
   Will this process change the weight of the car?
   What happens to the materials you identified during this event? How do they change?
   Does this event change the air? How? What is in the air that does not change?
   Does this event produce any new materials? What are they? Where do they come from? How are they formed?
   How are the atoms and molecules changing in the materials that you identified?
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  Energy:
   Does this event involve energy?
   Can you identify an energy source for this event? What is it?
   Why is it important for the car to have gasoline?
   What happens to the energy of the gasoline?
   Where does the energy go when the car stops? Can the energy be used again? Why or why not?

A tree decaying
   Structure:
    Can you identify any of the substances or materials that are changing during this event? What are they?
    Do any of the substances you named contain carbon? What are they?
   Process:
    Will this process change the weight of the tree?
    What happens to the materials you identified during this event? How do they change?
    Does this event change the air? How? What is in the air that does not change?
    Does this event produce any new materials? What are they? Where do they come from? How are they formed?
    How are the atoms and molecules changing in the materials that you identified?
   Energy:
    Does this event involve energy?
    Do you think the dead tree contains energy?
    What happens to the energy of the dead tree?
    Can the energy be used again? Why or why not?
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             Plants growing                 Child running                        Car climbing hill                    Tree decaying
Student 1 The sunlight is        He takes in oxygen and lets out CO 2. I don't know the chemical formula of      It is cellular respiration.
             energy.             O2 goes into cells for cellular       gasoline. But, I think gasoline is
                                 respiration and produces CO 2.        transformed. Its bonds are broken and The carbon transforms
           The energy is used                                          release energy.                           into CO2 and H2O.
             and transformed.    I guess you are losing carbon, so a
                                 little bit. C in CO2 comes from       The gasoline itself may transformed
           The CO2 and water     glucose. The glucose molecules are    into other substances. It probably
             are used to make    broken and energy released.           needs oxygen to burn.
             glucose
             molecules. Use      Some energy is released as heat,      The gasoline has potential energy. It
             glucoses to grow.   some as ATP.                          transforms into kinetic energy.


           They use energy in                                          "Is there any other forms of energy
             the glucose like                                          involved?" I don't know whether there
             ATP to grow.                                              is any other form of energy.


           The light energy                                            "When car stops, where does the
             goes into the                                             potential energy of gasoline go?" - I
             bonds of glucose                                          have no idea. (Finally,) - There may be
             molecules.                                                heat. Mostly heat.
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                Corn plants growing                  Child running              Car climbing hill                Tree decaying
Student 2 Corn changes CO2 in its cells      The child is breathing O2 &      Carbon from pipe of      The tree decaying is tree matters
             plus photosynthesis (from        glucose and exhaling CO 2        the car using            from decomposing. The carbon
             leaves) to produce glucose       running cellular respiration     gasoline                 dioxide goes in to the air to help
             and O2                                                                                     other molecules change
           Glucose contains CO2 and then     Materials changed and            It does not change the
             releasing it in the air          contained carbon                 weight; carbon          The tree is losing weight because
                                                                               dioxide from the         the materials are different; the
           Corn plants will gain weight      Losing weight because of          gasoline changes the     decomposing becomes many the
             because the glucose is in the    exercising: consuming            air                      tree smaller (physical event); the
             cells                            glucose                                                   air is changing because carbon
           It does change the air because    Changing the air because         Molecules and atoms       dioxide left
             taking CO 2 from the air and     CO2 came out from the child      convert by the heat     It does not produce new materials,
             producing other gases                                             to produce carbon        just left out some materials ;
                                             Cellular respiration is making    dioxide                  atoms and molecules just convert
           No new materials produced          atoms and molecules                                       to different forms to become
             (just recycling); carbon is      different in the cells          The energy source is      oxygen like carbon dioxide
             breaking down to produce                                          gasoline; energy         transforming in the air back and
             glucose (different bonds &      Energy came from food;            goes into the air        forth
             extra molecules)                 energy goes to the cells of      when the car stops      The event does not involve energy;
           It involves energy called ATP;     the body when the event          and it cannot be used    it is not using energy because the
             energy source is sunlight;       ends; make body structure;       again                    tree is dead; the energy cannot be
             energy cannot be used            energy can be used again                                  used again
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                Corn plants growing                           Child running                           Car climbing hill              Tree decaying
Student 3   Sunlight makes it grow so that     He is losing heat because he is sweating      The air, the carbon dioxide, is       Carbon, oxygen,
             we can eat; leaves and stalks      when running                                  changing during this event            and water are the
             contain carbon…                   “Can you identify any of the substances or It produced carbon, water, oxygen,        substances that
            It gains weight because it has      materials that are changing during this       and hydrogen                          are changing
             more water into body; I don’t      event?” Water & carbon dioxide               “Will this process change the          during this event
             know if this event change the     “Will this process change the weight of the     weight of the child?” No
             air; water is the one that does     child?” No                                  “What happens to the materials        This process
             not change; Water, nutrition,     “What happens to the materials you             you identified during this event?”    change the weight
             and carbon dioxide; they are        identified during this event?” They just     They go into the air. Carbon into     of the tree
             from the air; I don’t know how      come out                                     the air may pollute the air           because it loses
             they are formed; I don’t know     “Does this event change the air?” No          The new material is carbon             mass
             how the atoms and molecules        “Does this event produce any new              dioxide. It comes from the car       This event does not
             are changing…                       materials?” No                               because of burning gas                change the air
                                                “How are the atoms and molecules             “How are the atoms and molecules This event does not
            It involves energy because it        changing in the materials that you           changing in the materials that you    produce any new
             gave plants to grow; the            identified?” I don’t know                    identified?” Doing arrange, in the    materials
             energy source is from                                                            air, I guess.
             sunlight; the energy goes into    The energy source is the food he eats.                                              The tree is breaking
             ground and it can be used           The food can keeps him running. The         The energy source is the engine        down because it is
             again because it transformed        food breaks down and gives energy for “Why is it important for the car to          dying
             into ground so that trees can       him to run. Energy will be lost into H2O     have gasoline?” Because it can       This event does not
             grow...                             & carbon so it cannot be used again          move                                  involve energy
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                     Corn plants growing             Child running                  Car climbing hill                    Tree decaying
Student 4 Water, sunlight, and nutrients from    Kid will take in oxygen   Air will change around the car. Car Tree dies and trees stop
             soil are necessary.                   and take out heat        is polluting the air. Bad gases.       letting out oxygen.
           Plants are making themselves food       and breathe out          Car needs gasoline and power.
             so the weight changes. Don't know     CO2.                                                           You need a lot of water,
             how the materials change.                                     The weight does not change. The         sunlight, nutrients in
                                                 Kid will lose weight if    gasoline goes on and out into the      sunlight.
           The nutrients go up the stems and       he runs a lot.           air and it stays there. It pollutes
             the sunlight goes into the leaves                              air but I don't know. It does not     Less weight because it falls
             and that's where they make food.    New materials?             change the air.                        apart and goes away. Don't
             They let out oxygen and take in     I don't know. If you                                              know how it changes.
             CO2. Doesn't know what does not       breathe out CO2         Air will be changing, fresh air if you Trees are not letting out
             change.                               then there's carbon      don't have any cars, cars let out      oxygen anymore. New
           New materials: corns, oxygen, food      in the body but I        the gasoline in the air and it         materials: no.
             for bugs. I don't know how they       don't know.              pollutes but I don't know how it      Substances and materials:
             come from. Maybe minerals and                                  pollutes.                              wood, tree trunk are
             nutrients are changing but don't    Energy source:            Air and gasoline contains carbon.       changing- decaying.
             know.                                 muscles. Food and        Motor in the car, gasoline are the Doesn't involve energy.
           Air and maybe nutrients have carbon     water give you           energy source. Don't know what         Dead tree does not have
             in it but don't know.                 energy. Energy: you      happens to the energy.                 energy. Don't know what
           Sunlight is the energy source.          get tired when you      The energy left over in the car, you    happen to the energy.
             Energy goes into the leaves and I     run. I don't know.       can use that but the energy that       Energy disappears. No
             don't know.                                                    you used you cannot use it again.      energy anymore.
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                   Corn plants growing                        Child running                 Car climbing hill                 Tree decaying
Student 5 Corn plants in the sunlight they His heart is pumping harder,                  Car exhausts. Gasoline       Wood changes.
             can get too much heat and            breathing faster, everything gets       is necessary. The           The tree could fall and kill stuff.
             die? Water, sunlight and dirt        faster, gets exhausted.                 gasoline is burned up       Tree needs to grow first to
             are necessary.                      Food, water, sleep and shoes are         slowly. It's used for the    decay.
           Weight does not change.                necessary.                              car to give energy and      The weight decreases
                                                                                          the bi-product, CO 2, of     because its parts are falling
           Water dries up but glaciers are Using his energy storage, he loses             the gases goes into          off.
             melting so it will balance out.      weight.                                 the air.
             Plants growing creates more         Water is sweated out and stays in                                    It is losing energy so it can't
             air: oxygen.                         the body.                              New materials: gas.           support itself anymore and
           New materials: radiation.                                                                                   falls apart.
           Corn gets drier. Dirt will be         The food is mostly wasted.              Gasoline is transferred      It's changing the air because it
             drier, less moisture, Water         Pooping, and farting changes the air.    throughout the car but       is not producing CO2
             will be less.                        New material: sweat.                    don't know exactly.          anymore.
           The plant does not contain            Made of water, evaporating from the
             carbon it just produces it,          skin.                                  Air is changing.             Wood, air are changing. Both
             Water has it and sunlight has       Don't know things that are changing.                                  contain carbon.
             it.                                 Energy source: food. Important          Air contains carbon.         The dead tree has the energy.
           Energy source: sun. Energy             because nutrients, calcium, protein    Energy source:               Nothing happens to the energy
             from sunlight goes inside the        are needed for certain parts of         gasoline.                    of the dead tree.
             corn. When it hits the dirt it is    body.                                                               Don't know if the energy can
             wasted.                             Energy is being used up, burned up.                                   be used again.
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Notes about student levels and patterns in their responses
Student 1 (HS14) – Level 5
Qualitative model-based reasoning
Separate accounting for matter and energy

Student 2 (HS16) – Level 4-5
Qualitative model-based reasoning about matter
School science narratives about energy: Confusion about forms of energy (especially chemical potential
energy) prevents meaningful use of conservation of energy for tracing energy

Student 3 (HS8) – Level 4
School science narratives: processes changing matter and energy
Confusion about substances and forms of energy prevents meaningful use of conservation laws to trace
matter or energy

Student 4 (MD5) – Level 3-4
School science narratives about matter: Stories of events use mostly common-language names for materials
without meaningful accounting for how matter is conserved or transformed
Gas exchange (O2 and CO2) is separate from accounts of what happens to food, fuel, and energy
Energy is used in ways consistent with common cultural models (energy in sunlight, muscles, motor of car, not
in decaying tree), but not in ways that give it any power as an explanatory concept

Student 5 (MD6) – Level 2-3
Descriptions focus on observable macroscopic events and use mostly informal names for materials
No clear distinction among materials, conditions, and forms of energy in accounts of events
Occasional reference to internal mechanisms, components of materials
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