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Test 2 Review

Test 2 Review. Test Format. Part I: Lab set up Follow directions, answer question, apply information Part II: Written/computer test 31 questions Multiple choice See score right away. Vocabulary. Chemical equation Reactant Product Conservation of mass Closed system Open system

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Test 2 Review

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  1. Test 2 Review

  2. Test Format • Part I: • Lab set up • Follow directions, answer question, apply information • Part II: • Written/computer test • 31 questions • Multiple choice • See score right away

  3. Vocabulary • Chemical equation • Reactant • Product • Conservation of mass • Closed system • Open system • Photosynthesis • Respiration • Fire • Rust • Catalyst • Endothermic • Exothermic • Precipitate • Chemical change • Physical change • Chemical property • Physical property • Evaporation • Freezing • Boiling • Flammability • Dependent variable • Independent variable

  4. Chemical Equations Can you identify: • Reactant+ reactant product + product • product + product reactant + reactant

  5. Practice 6 CO2 + 6 H20  C6H12O6 + 6 O2 carbon dioxide + water sugar + oxygen Circle the reactants: Box the products: What is this equation?

  6. Practice Fe + O2 + H2O  Rust 2Mg + O2  2MgO

  7. Law of Conservation of Mass • Total mass of reactants = Total mass of products 5g H20 + 5g O2 = _____ g 2H2O2 10g = 10g

  8. Law of Conservation of Mass • Same # of atoms on reactant side as the product side 2H2 + O2  2(H2O) H= ____ H=____ O= ____ O=____ 4 4 2 2

  9. Practice Mg + O2 MgO Mg = ____ Mg= ____ O = _____ O = _____

  10. Is this balanced? NO 2 2 Mg + O2 ___ MgO Mg = ____ Mg= ____ O = _____ O = _____ 2 2 2 2

  11. +   Produced a gas  (closed system)  (open system) 5g 85g ___ g 90 g <90 g

  12. Photosynthesis 6 CO2 + 6 H20  C6H12O6 + 6 O2 carbon dioxide + water sugar + oxygen Respiration C6H12O6 + 6 O2 6 CO2 + 6 H20 + ATP sugar + oxygen carbon + water + energy dioxide

  13. What influences the rate of a reaction (how fast it happens?) • Crushing (size) • Stirring (motion) • Temperature • Amount of solution • Catalyst (substance that speeds up reaction)

  14. Describing reactions Heat given off • Exothermic = ____________ • Endothermic = _________________ Heat taken in

  15. How has understanding chemistry helped us? • Inventions of new things • Discovery of new elements • Cooking • Forming new items

  16. Property or Change? • Property = describes, characteristic What it has the ABILITY to do Change = actually changing

  17. Property or Change? • Boiling point of a chemical • 2 different liquids mix  bubbles • Food coloring in water • Burning an egg • It has a yellow color • It produced a smell • It melted Property Change Change Change Property Change Change

  18. Physical or Chemical • Physical = it looks different BUT the atoms are still the same you could reverse it • Chemical = may or may not look different BUT the atoms are rearranged differently you CAN’T reverse it

  19. PC or CC • Tearing paper • Burning paper • Breaking wood • Campfire • Mixing kool aid • Cooking a cake • Freezing water Physical change Chemical change Physical change Chemical change Physical change Chemical change Physical change

  20. Remember • Login to utips • Enrollment code • Teach parents  turn in orange paper WEDS

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