Answer:
their smell & melting point
The percent composition of what? It should ask to find the percent composition of one of the parts like copper, sulfer, or water.
The electron dot structure for each molecule are:
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a. H:O:O:H
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The partial negative charges are on the Oxygen atoms.
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b. H:Cl:
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The partial negative charge is on the Chlorine atom.
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c. H:Br:
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The partial negative sign is on Bromine atom.
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d. H:O:H
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The partial negative sign is on the Oxygen atom.
Water, because electrolysis is using electricity to break the bond of water to release 2 Hydrogens and the 1 Oxygen.
