1 / 16

Warm Up 10/8

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

vian
Download Presentation

Warm Up 10/8

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  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

More Related