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Which procedure did early chemists use to determine which substances were elements? . a. they mixed several substances together and observed the results.. b. they broke down mixtures by chemical means.. c. they physically broke down the elements they discovered.. d. they observed the substances that made up individual atoms.. . why do elements in a group on the periodic table have similar chemical properties? . a. similar atomic masses. b. similar atomic numbers. c. same number of protons. d. same number of outermost electrons.
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This active feature of earth's crust in building mountain ranges as well as islands. this feature is a a) cavern. b) earthquake. c) mountain. d) volcano.
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Which of the following contributes to the structural rigidity of cellulose? adjacent glucose polymers are stabilized by hydrogen bonding. glucose residues are joined by (α1→4) linkages. cellulose is a highly branched molecule. the conformation of the glucose polymer is a coiled structure.
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Which procedure did early chemists use to determine which substances were elements? . a. they mixed...
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