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8.25 Chemistry 5 Evidences of a chemical reaction, chemical formula.

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Presentation on theme: "8.25 Chemistry 5 Evidences of a chemical reaction, chemical formula."— Presentation transcript:

1 8.25 Chemistry 5 Evidences of a chemical reaction, chemical formula

2 8.25 WARM UP What is the saying to remember the 5 evidences of a chemical reaction?

3 5 Evidences Osos Can Produce Grande Turds Odor given off Color change Precipitate Gas produced Temperature change

4 Announcements Quiz #4 – Tues Review sheet on blog & ed Hypothesis Forms due Weds Late Science Fair Journal checks – not during class (success, before or after…) Final Project Approval – FRI 9/3 & 9/4 Mandatory Meeting for IRB

5 LEARNING GOAL: Structures of Matter 4 - I can describe the different types of properties & changes & give evidence as to why 3 - I can identify pp, cp, pc, cc 2 - I know most properties & changes 1 - I know several properties & changes

6 Prezi Prezi Notes go to blog 27 Examples of Awesome Chemical Reactions: chemical-reactions chemical-reactions

7 8.25 Chemical Reactions & Chemical Formula Notes

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9 Fun songs that review

10 Chemical Equation Reactant + reactant  product + product

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12 Salt Na + Cl  NaCl In Notebooks: Na + Cl  NaCl Circle the reactants Box the products

13 Photosynthesis 6 (CO 2 ) + 6(H 2 O)  C 6 H 12 O (O 2 )

14 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

15 Example baking soda + vinegar  sodium acetate + water + carbon dioxide 1.5 g g  21.5 g ______ = ______ NaHCO 3 + CH 3 COOH => CH 3 COO - Na + + H 2 O + CO g = 21.5 g

16 Conservation of Mass 2 H 2 O 2 → 2 H 2 O+ O 2  110g + 10g + 3g 123g

17 Example 1 - Water H 2 + O 2  H 2 O 1.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?

18 Balance the equation… H 2 + O 2  H 2 O Mass of reactants = mass of products? 2 (H 2 ) + (O 2 )=2 (H 2 O)

19 Now it’s your turn, answer the rest __ H + __ O 2  __ H 2 O __ CH 4 + __ O 2  __ CO 2 + __ H 2 O __ Zn + __ HCl  __ ZnCl 2 + __ H 2 __ Ca + __ H 2 O  __ Ca(OH) 2 + __H 2 __C 5 H 12 + __ O 2  __ CO 2 + __H 2 0 CaCO 3  CaO + _____

20 content/uploads/2011/04/heintz-vinegar.jpg content/uploads/2011/04/heintz-vinegar.jpg &safe=active&client=safari&sa=N&rls=en&biw=1120&bih=594&tbm =isch&tbnid=axIiz7wO9xQDxM:&imgrefurl=http://www.globalwarmi ngart.com/wiki/File:Oxygen_Molecule_VdW_png&docid=O473puSV p8- OcM&w=400&h=296&ei=hHGKTpipFtKmsALX9aC4BA&zoom=1&iact =hc&vpx=255&vpy=282&dur=412&hovh=193&hovw=261&tx=150&t y=89&page=1&tbnh=118&tbnw=153&start=0&ndsp=18&ved=1t:42 9,r:7,s:0 molecule_0.png


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