Chemistry 2.1
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Transcript of Chemistry 2.1
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ChemistryChapter 2 - Section 1
Chemical Formulas & Equations
Monday, July 9, 2012
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Physical or Chemical?
Monday, July 9, 2012
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Physical or Chemical?
Monday, July 9, 2012
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Physical or Chemical?
Yeast +
Hydrogen Peroxide =
???????
Monday, July 9, 2012
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Chemical Reaction?
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A process that produces a
chemical change
Chemical Reaction?
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Chemical Equations
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Chemical Equations
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Substances that exist before the reaction begins
Chemical Equations
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Substances that exist before the reaction begins
Chemical Equations
Substances that form as a result of the reaction
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Describe What is Happening
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Describe What is Happening
I use a chemical
equation to know the reactants,
products and proportions
of each substance.
Monday, July 9, 2012
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Describe What is Happening
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Describe What is Happening
My Chemical Equation can use
words, chemical names,
or formulas.
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Using Words
Baking Soda + Vinegar --> Gas + White Solid
Charcoal + Oxygen --> Ash + Gas + Heat
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Chemical Names
Acidic Acid + Sodium Hydrogen Carbonate -->
Sodium Acetate + Water + Carbon Dioxide
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Chemical Formula’s
CH3COOH + NaHCO3 --> CH3COONa + H2O + CO2
Sodium Hydrogen Carbonate
Acetic Acid
Sodium Acetate
Water Carbon Dioxide
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Arrows and Subscript
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It’s All a Balancing Act
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Conserve That Mass
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Conserve That Mass
The mass of the products must be the same as the mass of the reactants in the chemical reaction.
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Conserve That Mass
The mass of the products must be the same as the mass of the reactants in the chemical reaction.
Atoms are never lost of created in a chemical reaction; however they do change partners.
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Conserve That Mass
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Let’s Try
Tarnishing silver....
Ag + H2S --> Ag2S + H2
SilverHydrogen sulfide
Silver Sulfide Hydrogen
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Let’s Try
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Let’s Try
Na + AlCl3 --> NaCl + Al KBr + Cl2 --> KCl + Br2
H2O2 --> H20 + O2
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Energy in a Chemical Equation
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Energy is often released or absorbed during a chemical reaction.
Energy in a Chemical Equation
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Energy Released
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Energy Released
Where does this energy come from?
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Energy Released
Where does this energy come from?
You have to think about the chemical bonds of the reactants and the products, in order to answer this question.
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Energy Released
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Energy Released
When energy is released, the products are more stable, and their bonds have less energy than those of the reactants.
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Energy Released
When energy is released, the products are more stable, and their bonds have less energy than those of the reactants.
The extra energy is released in different forms: light, sound, thermal energy.
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Energy Absorbed
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Energy Absorbed
When energy is absorbed, the reactants are more stable, and their bonds have less energy than those of the products.
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Energy Absorbed
When energy is absorbed, the reactants are more stable, and their bonds have less energy than those of the products.
The extra energy needed to form the products can be supplied in the form of electricity, light, sound, thermal energy.
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Energy Released
2H2 + O2 --> 2H2O + energy
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Energy Released
2H2 + O2 --> 2H2O + energy
2H2O + energy --> 2H2 + O2
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Energy Released
2H2 + O2 --> 2H2O + energy
Energy Absorbed
2H2O + energy --> 2H2 + O2
Monday, July 9, 2012
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When thermal energy is gained or lost, special
terms are used….
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When thermal energy is gained or lost, special
terms are used….
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When thermal energy is gained or lost, special
terms are used….
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When thermal energy is gained or lost, special
terms are used….
Absorb thermal energy
Release thermal energy
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Endothermic or Exothermic Absorb or ReleaseQuickly or Slowly
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Adding ENERGY to the equation
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Finished!
Monday, July 9, 2012