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Physical and chemical weathering • Weathering-breaking down rocks • Two types: • 1. Mechanical weathering-just breaks it down and does not have a chemical change • 2. Chemical weathering-the rock’s minerals change into different substances BrainPOP-weathering • http://www.brainpop.com/science/weather/ weathering/ Mechanical weathering • Causes: • 1. Ice wedging- water freezes in cracks and expands breaking the rock • 2. Animals digging (claws) • 3. Plant roots growing (pressure) Chemical Weathering • • • • • • Causes: Reactions 1. rainwater (acid rain) 2. oxygen (reacts with iron-makes rust) 3. carbon dioxide 4. acids of plant decay. 5. sulfuric acid pH scale pH scale • Acidic is below 7 • Alkaline (or base) is above 7 • Neutral is 7 • Find your examples from the pH scale substances listed in that area for your notes BrainPOP- pH scale • http://www.brainpop.com/science/matterand chemistry/phscale/ Table 2 (worksheet) • • • • Lab experiment: Chalk in vinegar Record what it looks like at start Watch overnight What does chalk look like next day Table 3 (worksheet) • Examine sugar cube at start • Examine sugar cubes after shaking 20 times • Examine sugar cubes again after shaking 20 times Table 1 (worksheet) • • • • • 1-tap water 2-rainwater 3-lemon juice 4 cola 5 ammonia