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Name__________________________________________________Period____________ CHEMISTRY REVIEW UNIT 2 – DESCRIBING MATTER Compare the states of matter by filling in the table. Solid Liquid Shape Volume Molecular movement Molecular attraction Distance between molecules Compressibility State of most metals State of nonmetals Gas Plasma Use the data table to answer the questions below. Substance Melting Point (oC) Boiling Point (oC) Water Mercury Oxygen 0 -39 -219 100 357 -183 1. Which substances are solid at -273oC? 2. Which substances are liquid at 50oC? 3. Which substances are gases at 300oC? ____________________________________ ____________________________________ ____________________________________ Define the following terms: 1. Matter 2. Homogeneous 3. Heterogeneous 4. Phase 5. Solution Give an example of something measureable that is NOT matter. ____________________ Check each choice that is always true. Pure Substance Is homogeneous Is heterogeneous Can be separated into 2 or more substances Can be separated by physical means Has properties different than its components Has 2 or more elements chemically combined Has variable composition Distilled water Snicker’s bar Element Compound Mixture Label each part of the diagram as an element, compound, or mixture. Explain how each separation technique is used and identify it as physical or chemical. How it is used Separation technique Physical Chemical Distillation Centrifugation Heating Filtration Evaporation Name four indicators of a chemical change. 1. 3. 2. 4. Define and give an example of the following. 1. Physical property 2. Chemical property 3. Physical change 4. Chemical change DENSITY PROBLEMS: Solve using dimensional analysis, show all work including units 1. What volume; in cm3, of silver metal will have a mass of 25.00 dg? The density of silver is 10.5 g/cm3. 2. Find the mass, in grams, of 0.250 L of benzene, a liquid solvent. The density of benzene is 0.90 g/mL. 3. Ethyl alcohol is added to a beaker with mass 204.88 g until the beaker and alcohol together weigh 253.2 g. What volume, in cL, was added to the beaker? The density of ethyl alcohol is 0.789 g/mL.