School Improvement in Maryland

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Standard 4.0 Chemistry

Topic B. Conservation of Matter

Indicator 1. Cite evidence to support the statement that, "No matter how many parts of an object are assembled, the mass of the whole object made is always the same as the sum of the parts."

Objective b. Use evidence from investigations with a variety of materials, such as water to describe how matter can change from one form to another without the loss of any mass.

Selected Response Item

A container is filled with 250 milliliters of water. The total mass of the container and the water is 300 grams.

What is the total mass of the container and the water after being in a freezer for 2 hours?

  1.  50 grams
  2. 250 grams
  3. 300 grams
  4. 550 grams
/share/assessment_items/xml/items/msa_science_5_028.xml

Correct Answer:
C

Selected Response Item

A student boils 100 grams of water to form water vapor (gas).

What method should the student use to determine that the mass of the water vapor is equal to 100 grams?

  1. measuring the amount of water vapor (gas) in the air
  2. collecting the water vapor (gas) and cooling it back to a liquid
  3. weighing the beaker before and after the water is boiled
  4. comparing the temperature of the boiling water to the temperature of the water vapor (gas)
/share/assessment_items/xml/items/msa_science_5_007.xml

Correct Answer:
B