final review of biology. chapter 2 final review for final exam.
Carbon
Oxygen
Phosphorus
Iron
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Mgci2
H2
Fe
C2h6
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Sugar and oxygen gas combine to form carbon dioxide and water
Sodium metal and chlorine gas unite to form sodium chloride
Hydrogen gas combines with oxygen gas to form water
Ice melts to form liquid water
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Is slightly negative at one end and slightly positive at the other
Has an extra electron, giving a positive charge
Has an extra electron, giving a negative charge
Has covalent bonds
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