conservation of matter


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Related to conservation of matter: law of conservation of matter

conservation of matter

(in physics) a law stating that matter can be neither created nor destroyed and that the amount of matter in the universe is finite. It is superseded by the special relativity equation e = mc2, but it is still applicable in the chemical process. Also called conservation of mass. See also conservation of energy.
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Increasingly complex experiences with the same reactions help build a deeper understanding of conservation of matter as students work through the unit.
Student understanding of the target benchmark was measured by outcomes on the Conservation of Matter Assessment (COMA).
COMA was constructed so that students taking the assessment think about four different physical/chemical phenomena as they respond to multiple probes of their knowledge of the conservation of matter.
The expert panel that developed the weighting scheme analyzed information from sample student responses, and set cut scores to distinguish four levels of student understanding of the conservation of matter benchmark:
When the weighting scheme is applied, the 10 items in COMA reliably target the conservation of matter benchmark, with Cronbach's alpha = 0.

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