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Elements PowerPoint Presentation

Elements

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Elements

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  1. Elements • sodium • chlorine • bromine • lead • gold • hydrogen • oxygen

  2. Compounds • sodium chloride • water • sucrose (sugar) • sodium bicarbonate (baking soda) • acetic acid (vinegar) • caffeine

  3. Homogeneous Mixtures • black coffee • iced tea • Kool-Aid • salt water • alloys: • bronze • brass • steel

  4. Heterogeneous Mixtures • oil and vinegar salad dressing • trail mix • contents of your backpack • sample of pellets from the lab • bucket of sand and water

  5. PHYSICAL PROPERTIES CHANGES melting/freezing vaporizing/condensing expanding contract crush break dissolving • density • state (solid, liquid, gas) • boiling point • melting point • sizes (mass, volume, length) • color • solubility • atomic weight

  6. CHEMICAL PROPERTIES CHANGES Burning Cooking Rusting Making salts from acid and base • Flammability • Reactivity with chemicals • with acid? • with water? • with metals? • with oxygen? • Types of bonds formed

  7. Signs of a Chemical Change • light • heat • color change • gas produced (bubbling) • odor • sound