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ChemistryChapter 2 - Section 1
Chemical Formulas & Equations
Monday, July 9, 2012
Physical or Chemical?
Monday, July 9, 2012
Physical or Chemical?
Monday, July 9, 2012
Physical or Chemical?
Yeast +
Hydrogen Peroxide =
???????
Monday, July 9, 2012
Chemical Reaction?
Monday, July 9, 2012
A process that produces a
chemical change
Chemical Reaction?
Monday, July 9, 2012
Chemical Equations
Monday, July 9, 2012
Chemical Equations
Monday, July 9, 2012
Substances that exist before the reaction begins
Chemical Equations
Monday, July 9, 2012
Substances that exist before the reaction begins
Chemical Equations
Substances that form as a result of the reaction
Monday, July 9, 2012
Describe What is Happening
Monday, July 9, 2012
Describe What is Happening
I use a chemical
equation to know the reactants,
products and proportions
of each substance.
Monday, July 9, 2012
Describe What is Happening
Monday, July 9, 2012
Describe What is Happening
My Chemical Equation can use
words, chemical names,
or formulas.
Monday, July 9, 2012
Using Words
Baking Soda + Vinegar --> Gas + White Solid
Charcoal + Oxygen --> Ash + Gas + Heat
Monday, July 9, 2012
Chemical Names
Acidic Acid + Sodium Hydrogen Carbonate -->
Sodium Acetate + Water + Carbon Dioxide
Monday, July 9, 2012
Chemical Formula’s
CH3COOH + NaHCO3 --> CH3COONa + H2O + CO2
Sodium Hydrogen Carbonate
Acetic Acid
Sodium Acetate
Water Carbon Dioxide
Monday, July 9, 2012
Arrows and Subscript
Monday, July 9, 2012
It’s All a Balancing Act
Monday, July 9, 2012
Conserve That Mass
Monday, July 9, 2012
Conserve That Mass
The mass of the products must be the same as the mass of the reactants in the chemical reaction.
Monday, July 9, 2012
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.
Monday, July 9, 2012
Conserve That Mass
Monday, July 9, 2012
Let’s Try
Tarnishing silver....
Ag + H2S --> Ag2S + H2
SilverHydrogen sulfide
Silver Sulfide Hydrogen
Monday, July 9, 2012
Let’s Try
Monday, July 9, 2012
Let’s Try
Na + AlCl3 --> NaCl + Al KBr + Cl2 --> KCl + Br2
H2O2 --> H20 + O2
Monday, July 9, 2012
Energy in a Chemical Equation
Monday, July 9, 2012
Energy is often released or absorbed during a chemical reaction.
Energy in a Chemical Equation
Monday, July 9, 2012
Energy Released
Monday, July 9, 2012
Energy Released
Where does this energy come from?
Monday, July 9, 2012
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.
Monday, July 9, 2012
Energy Released
Monday, July 9, 2012
Energy Released
When energy is released, the products are more stable, and their bonds have less energy than those of the reactants.
Monday, July 9, 2012
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.
Monday, July 9, 2012
Energy Absorbed
Monday, July 9, 2012
Energy Absorbed
When energy is absorbed, the reactants are more stable, and their bonds have less energy than those of the products.
Monday, July 9, 2012
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.
Monday, July 9, 2012
Energy Released
2H2 + O2 --> 2H2O + energy
Monday, July 9, 2012
Energy Released
2H2 + O2 --> 2H2O + energy
2H2O + energy --> 2H2 + O2
Monday, July 9, 2012
Energy Released
2H2 + O2 --> 2H2O + energy
Energy Absorbed
2H2O + energy --> 2H2 + O2
Monday, July 9, 2012
When thermal energy is gained or lost, special
terms are used….
Monday, July 9, 2012
When thermal energy is gained or lost, special
terms are used….
Monday, July 9, 2012
When thermal energy is gained or lost, special
terms are used….
Monday, July 9, 2012
When thermal energy is gained or lost, special
terms are used….
Absorb thermal energy
Release thermal energy
Monday, July 9, 2012
Endothermic or Exothermic Absorb or ReleaseQuickly or Slowly
Monday, July 9, 2012
Adding ENERGY to the equation
Monday, July 9, 2012
Finished!
Monday, July 9, 2012
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