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Q Unit 1-1: Introduction HW assignment Be sure to use correct SF and units in all of your answers which involve calculations. SHOW ALL WORK: you will NOT receive credit if there is no work shown for calculations. 1. What are the two main classifications of matter? 2. Label each as either an element or compound. 3. Label the following as a pure substance or a mixture. 4. What is the difference between and element and a compound? 5. What is the difference between a compound and a mixture? 6. Determine if each of the following is a chemical or physical property. 7. Label each number in each statement as an exact or measured number. 8. Label if each is a chemical or physical change...............

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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.