Warm Up 10/8

• SWOD #2: exothermicA chemical reaction that gives off heat (gets hotter)

• (from yesterday) SWOD #1: endothermicA chemical reaction that takes in heat (gets colder)

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

MON TUES WEDS THUR FRI SAT SUN

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GREEN SCIENCE FAIR OUTLINESDUE (extra credit)

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Quiz #5

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Review for test

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Lab Test #2

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Test #3GREEN SCIENCE FAIR OUTLINESDUE (no extra credit)

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FALL BREAK(no school)

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FALL BREAK(no school)

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LAST DAY OFQUARTER!!!• Extra Credit

Experiments Due

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4 things about rxns

• Temperature

• Catalyst

• Concentrations

• Stirring/crushing

Before AfterNotes on Chemical Equations

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

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 reacting to make a product”

Example 1 - Photosynthesis

6 CO2 + 6 H20 C6H12O6 + 6 O2

Circle the reactants:Box the products:

Photosynthesis

6 (CO2) + 6(H2O) C6H12O6 + 6 (O2 )

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

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

Example

baking soda + vinegarsodium acetate + water + carbon dioxide

1.5 g + 20.0 g 21.5 g 21.5 g = 21.5 gNaHCO3 + CH3COOH => CH3COO-Na+ + H2O + CO2

Example 1 - WaterH + O2 H2O1. 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?

Balance the equation…

H2 + O2 H2O

H + O2 H2OMass of reactants = mass of products?

4 (H) + 2(O) =2 (H2O)

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

• http://www.flickr.com/photos/tpapi/3275375488/lightbox/• http://thekrazycouponlady.com/wp-content/uploads/2011/04/heintz-vi

negar.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