Edward Valadez

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How to Balance Chemical Equations A chemical equation is a theoretical or written representation of what happens during a chemical reaction. The law of conservation of mass states that no atoms can be created or destroyed in a chemical reaction, so the number of atoms that are present in the reactants has to balance the number of atoms that are present in the products. Follow this guide to learn how to balance chemical equations. Step 1 Write down your given equation. For this example, we will use: C 3 H 8 + O 2 --> H 2 O + CO 2 Step 2 Write down the number of atoms that you have on each side of the equation. Look at the subscripts next to each atom to find the number of atoms in the equation. Left side: 3 carbon, 8 hydrogen and 2 oxygen Right side: 1 carbon, 2 hydrogen and 3 oxygen
Step 3 Always leave hydrogen and oxygen for last. This means that you will need to balance the carbon atoms first. Step 4 Add a coefficient to the single carbon atom on the right of the equation to balance it with the 3 carbon atoms on the left of the equation. C 3 H 8 + O 2 --> H 2 O + 3CO 2 The coefficient 3 in front of carbon on the right side indicates 3 carbon atoms just as the subscript 3 on the left side indicates 3 carbon atoms. In a chemical equation, you can change coefficients, but you should never alter the subscripts.
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Edward Valadez YEAR 2014
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Unit 1 Measurement Lab Separation o
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Unit 4 (15 days) Chapter 10 Chemica
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29. Never handle broken glass with
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Table E Selected Polyatomic Ions Fo
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Table H Vapor Pressure of Four Liqu
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Table K Common Acids Table N Select
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Table R Organic Functional Groups C
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Table S Properties of Selected Elem
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Table T Important Formulas and Equa
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SCIENTIFIC NOTATION RULES How to Wr
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1. 7,485 6. 1.683 2. 884.2 7. 3.622
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Significant Figures Rules There are
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Rule 3: A final zero or trailing ze
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16) 3.88 x 10 = 3 17) 3004 = ____4_
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15) 8000 ÷ 4.62 = __________ 16) 0
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2. One cereal bar has a mass of 37
Page 42 and 43: 1. How many meters are in one kilom
Page 44 and 45: Dimensional Analysis This is a way
Page 47: Converting Real Things Table 1 Usin
Page 50 and 51: http://www.learner.org/interactives
Page 53: Electrovalence Don't get worried ab
Page 56: P N P N
Page 60 and 61: www.youtube.com/watch?v=jtYzEzykFdg
Page 62: In the space below, write the unabb
Page 70 and 71: Increases Atomic Size Increases Top
Page 72 and 73: Electronegativity Increases Electro
Page 74 and 75: Create groups for these Scientist a
Page 76 and 77: Radioactivity was discovered my Ant
Page 78 and 79: The students will learn how ionic c
Page 80 and 81: Metallic bounding Notes Lattice- a
Page 82 and 83: Covalent H - O 2+ H20,OH, H30 1,2,3
Page 84 and 85: Name Formula Charge Dichromate Cr
Page 86 and 87: Bent Bent Octahedral Square Planar
Page 88 and 89: The Mole www.youtube.com/watch?v=As
Page 90 and 91: Mole Conversions The Three Steps to
Page 96 and 97: Step 5 Balance the hydrogen atoms n
Page 98 and 99: 6) ___ Mn(NO 2 ) 2 + ___ BeCl 2 __
Page 100 and 101: Categories of Reactions All chemica
Page 102 and 103: 1) NaOH + KNO 3 --> NaNO 3 + KOH 2)
Page 104 and 105: Balancing Equations Practice Proble
Page 107 and 108: Percent Yield Practice Problems fro
Page 109 and 110: Liquids Liquids have a definite vol
Page 111 and 112: Changes of State When a solid is he
Page 113 and 114: Boyle’s Law States that for a giv
Page 115 and 116: Example http://www.youtube.com/watc
Page 117 and 118: Formula and Usage V 1 / T 1 = V 2 /
Page 119 and 120: Gay-Lussac’s Law States that if a
Page 121 and 122: Example http://www.youtube.com/watc
Page 123 and 124: Notes PV = nRT P = pressure V = vol
Page 125: Unit 5 Chapter 13 States of Matter
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Edward Valadez

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