DCI 1.2 - Density

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DCI 1.2 - Density
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DCI Clicker Questions
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This is an example of adding a solid alcohol to
its liquid.

1. Predict what will happen when the solid is
   dropped into the liquid.a) the solid will sink
   in the liquidb) the solid will float on the
   liquid
2. After viewing video describe what you observe
   happening?a) the solid sank in the liquidb) the
   solid floats on the liquid

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• 3. Which of the following student statements is
  the best atomic/molecular level explanation for
  what you observed happening in the video?A) The
  liquid has the lowest density because the
  molecules are not as closely compacted and are
  free to move around.B) The liquid has the lowest
  density because there is more empty space (or
  air-filled space) between molecules than in the
  solid. The open space decreases the density
  because it is lighter than the molecules.C) The
  liquid has a lower density. Density mass/volume
  and the solid has a greater mass because it has
  more particles per unit volume. Hence, the
  density of the solid would be greater than the
  liquid.D) The atoms and molecules in the solid
  phase are clearly more dense.E) Solid molecules
  weigh less than liquid molecules for a pure
  substance.F) Liquid molecules weigh less than
  solid molecules for a pure substanceG) The
  liquid would have a lower density since its shape
  but not volume can be changed.

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This is an example of adding solid water to its
liquid.

1. Predict what will happen when the solid is
   dropped into the liquid.a) the solid will sink
   in the liquidb) the solid will float on the
   liquid
2. After viewing video describe what you observe
   happening?a) the solid sank in the liquidb) the
   solid floats on the liquid

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• 3. Which of the following student statements is
  the best atomic/molecular level explanation for
  what you observed happening in the video?A) The
  solid has the lowest density because the
  molecules are not as closely compacted and are
  free to move around.B) The solid has the lowest
  density because there is more empty space (or
  air-filled space) between molecules than in the
  liquid. The open space decreases the density
  because it is lighter than the molecules.C) The
  solid has a lower density. Density mass/volume
  and the liquid has a greater mass because it has
  more particles per unit volume. Hence, the
  density of the liquid would be greater than the
  solid.D) The atoms and molecules in the liquid
  phase are clearly more dense.E) Liquid molecules
  weigh less than solid molecules for a pure
  substance.F) Solid molecules weigh less than
  liquid molecules for a pure substanceG) The
  solid would have a lower density since its shape
  but not volume can be changed.

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• 4. Below are two images representing water at the
  level of atoms and molecules (the particulate
  level).
• a) Identify the phase (gas, liquid or solid)
  depicted in Figure I.1) Gas2) Liquid3) Solid
• b) Identify the phase depicted in Figure II.1)
  Gas2) Liquid3) Solid

Figure I
Figure II
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The three colored balloon of equal volume each
contain a different gas. The three possible gases
are helium, air, and argon.

• The green balloon containsa) heliumb) airc)
  argon
• 2. The blue balloon containsa) Heliumb) Airc)
  argon
• 3. The red balloon containsa) Heliumb) Airc)
  argon