Chemistry: Classifying Matter Name______________________ Classify each of the materials below. In the center column, state whether the material is a pure substance or a mixture. If the material is a pure substance, further classify it as either an element or compound in the right column. Similarly, if the material is a mixture, further classify it as homogeneous or heterogeneous in the right column. Write the entire word in each space to earn full credit. Material concrete sugar + pure water (C12H22O11 + H2O) iron filings (Fe) limestone (CaCO3) Pure Substance or Mixture Mixture Mixture Pure Substance Pure Substance orange juice (w/pulp) Mixture Pacific Ocean Mixture air inside a balloon Mixture aluminum (Al) Pure Substance magnesium (Mg) Pure Substance acetylene (C2H2) Pure Substance tap water in a glass Mixture soil Mixture pure water (H2O) Pure Substance chromium (Cr) Pure Substance Chex mix salt + pure water (NaCl + H2O) benzene (C6H6) muddy water brass (Cu mixed with Zn) baking soda (NaHCO3) Chapter 17.1 Questions Mixture Mixture Pure Substance Mixture Mixture Pure Substance Element, Compound, Homogeneous, Heterogeneous 1. How did you differentiate between an element and a compound? Give an example of each. 2. How did you distinguish between a homogeneous mixture and a heterogeneous mixture? Give an example of each. Chapter 17.2 Questions 1. In terms of substances, explain why evaporation of water is a physical change and not a chemical change. 2. Why is flammability a chemical property rather than a physical property? 3. What kind of change occurs when melting a substance? Boiling a substance? Why? 4. How does the law of conservation of mass apply to chemical changes? 5. When discerning a chemical vs. physical change, what do you look for? .