by 
Dalila
ANSWERS: 4
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no. lower density, not less mass.
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very very very slightly less mass, due to lower energy (lower temperature). Remember E = mc²
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No. a water molecule have exactly the same weight, whether it is in steam, in running water or in ice.
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Depends on the kind of ice. Molecules are molecules. Their atomic number/atomic mass does not change just because of temperature. But CO2 ice would indeed be different.
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