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Chemical Reactions: Equations & Conservation

Learn about exothermic and endothermic reactions, elements, compounds, and balancing chemical equations. Explore the Law of Conservation of Mass and dive into examples like photosynthesis and respiration.

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Chemical Reactions: Equations & Conservation

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  1. Warm Up 10/8 • SWOD #2: exothermic A chemical reaction that gives off heat (gets hotter) • (from yesterday) SWOD #1: endothermic A chemical reaction that takes in heat (gets colder)

  2. Announcements • Grades updated • Test next Tues & Weds • End of Quarter 10/24 (2 ½ weeks left!!!)

  3. 4 things about rxns • Temperature • Catalyst • Concentrations • Stirring/crushing

  4. Before  AfterNotes on Chemical Equations

  5. Elements and Atoms • Element: the pure substance containing only one atom Ex: Carbon (C), Calcium (Ca), Nitrogen (N), Oxygen (O) • Compound:two or more elements combined chemically Ex: H2O, NaCl

  6. Chemical Equations -Chemical equation: An equation that tells you how much of each substance (or atoms) that are involved in the reaction Reactant + reactant product + product “something is reactingto make a product”

  7. Example 1 - Photosynthesis 6 CO2 + 6 H20  C6H12O6 + 6 O2 Circle the reactants: Box the products:

  8. Photosynthesis 6 (CO2) + 6(H2O) C6H12O6 + 6(O2 )

  9. Example 2 - Respiration • C6H12O6 + 6 O2 6 CO2 + 6 H20 + energy Circle the reactants: Box the products: Answer: C6H12O6 + 6 O2 6 CO2 + 6 H20 + energy

  10. The Law of Conservation of Mass • States that matter can neither be created nor destroyed • Total mass of reactants = total mass of products  Same amount of atoms need to be on the reactant side as the product side

  11. Example baking soda + vinegarsodium acetate + water + carbon dioxide 1.5 g + 20.0 g 21.5 g 21.5 g = 21.5 g NaHCO3 + CH3COOH => CH3COO-Na+ + H2O + CO2

  12. Example 1 - Water H + O2  H2O • How many atoms are on the reactant side? ___ H + ___ O 2. How many atoms are on the product side? ___ H + ___ O 3. Are there the same amount of H atoms on both sides? 4. Are there the same amount of O atoms on both sides?

  13. Balance the equation… H2+ O2  H2O H + O2  H2O Mass of reactants = mass of products? 4 (H) + 2(O) = 2 (H2O)

  14. Now it’s your turn, answer the rest of the questions on the notes sheet

  15. http://www.flickr.com/photos/tpapi/3275375488/lightbox/ • http://thekrazycouponlady.com/wp-content/uploads/2011/04/heintz-vinegar.jpg • http://www.flickr.com/photos/katerha/5703151566/lightbox/ • http://www.google.com/imgres?q=oxygen+molecule&um=1&hl=en&safe=active&client=safari&sa=N&rls=en&biw=1120&bih=594&tbm=isch&tbnid=axIiz7wO9xQDxM:&imgrefurl=http://www.globalwarmingart.com/wiki/File:Oxygen_Molecule_VdW_png&docid=O473puSVp8-OcM&w=400&h=296&ei=hHGKTpipFtKmsALX9aC4BA&zoom=1&iact=hc&vpx=255&vpy=282&dur=412&hovh=193&hovw=261&tx=150&ty=89&page=1&tbnh=118&tbnw=153&start=0&ndsp=18&ved=1t:429,r:7,s:0 • http://www.chemistryforkids.net/sites/default/files/hydrogen-molecule_0.png

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