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Week 2 Homework 1

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1. Pure substances and mixtures are the two subgroups of matter. Elements and compounds are formed through the further division of pure substances. Physically coupled structures known as mixtures can be disassembled into their component parts. One particular sort of atom or molecule makes up a chemical compound. 2. a. Ni - element b. NO2 - compound c. HI - compound 3. In (a), 2 different elements seem to be mixed together. Therefore, it is a mixture. In (b), only 1 element is present. Therefore, it is a pure substance. In (c), only 1 element is present. Therefore, it is a pure substance.