Review Sheet for Chemistry 130 Final Exam Matter: Anything that takes up space and has mass Physical Changes and Chemical Changes Define each. How can you tell the difference between the two? Classify the following as physical or chemical changes a spoiling of milk b. bending wire c. cutting paper d. rusting of a nail Put the following into a graphic organizer/flowchart and define each: Matter Pure substances-elements and compounds Mixtures - homogeneous (solutions) and heterogeneous Identify the following as pure substances, homogeneous mixtures or heterogeneous mixtures: a. copper b. sweetened tea c. sand and water d. calcium carbonate (CaCO) Sketch particles in the three states of matter. How close are the particles and how much do they move? Solid Gas Measurements > Define: . Accuracy Precision If Angela masses a the same beaker 3 times and her measurements were 25.43 grams, 24.23 grams, . and 25.98 grams, respectively, were her measurements precise? Explain. If the known mass of the beaker was 26.25 grams, was Angela's measurements accurate? Explain. > Find the Percent Error: When you react 65.39 grams of zinc metal with 72.92 grams of hydrochloric However, you obtained acid, you should obtain 136.30 grams of zinc chloride as one of the products. only 128.72 grams of zinc chloride. What is your percent error? Significant Figures: Count the significant figures in each of the following measurements b. 54.320 meters d. 3.0050 milliliters a. 0.00325 grams c 0.1500 liters
