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Standard 4.0 Chemistry

Topic B. Conservation of Matter

Indicator 1. Provide evidence to support the fact that the idea of atoms explains conservation of matter.

Objective c. Give reasons to justify the statement, "If the number of atoms stays the same no matter how the same atoms are rearranged, then their total mass stays the same."

Selected Response Item

When 1 gram of water is evaporated, the volume of the water vapor increases but the mass remains constant.

Why does the mass of the water remain constant?

  1. The temperature of the water remains constant.
  2. The pressure acting on the water remains constant.
  3. The number of atoms in the water remains constant.
  4. The distance between water molecules remains constant.
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Correct Answer:
C