warm up 10/8
DESCRIPTION
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!!!). - PowerPoint PPT PresentationTRANSCRIPT
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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)
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Announcements• Grades updated• Test next Tues & Weds• End of Quarter 10/24 (2 ½ weeks left!!!)
MON TUES WEDS THUR FRI SAT SUN
7 8 9 10
GREEN SCIENCE FAIR OUTLINESDUE (extra credit)
11
Quiz #5
12 13
14
Review for test
15
Lab Test #2
16
Test #3GREEN SCIENCE FAIR OUTLINESDUE (no extra credit)
17
FALL BREAK(no school)
18
FALL BREAK(no school)
19
20
21 22 23 24
LAST DAY OFQUARTER!!!• Extra Credit
Experiments Due
25 26 27
28 29 30 31
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4 things about rxns
• Temperature
• Catalyst
• Concentrations
• Stirring/crushing
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Before AfterNotes on Chemical Equations
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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
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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”
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Example 1 - Photosynthesis
6 CO2 + 6 H20 C6H12O6 + 6 O2
Circle the reactants:Box the products:
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Photosynthesis
6 (CO2) + 6(H2O) C6H12O6 + 6 (O2 )
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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
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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
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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
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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?
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Balance the equation…
H2 + O2 H2O
H + O2 H2OMass of reactants = mass of products?
4 (H) + 2(O) =2 (H2O)
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Now it’s your turn, answer the rest of the questions on the notes sheet
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• 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