Elephant Toothpaste Every table needs: Trash bag Glasses and gloves for each person Bowl Spoon Once everyone is gloved and has their glasses.
Post on 03-Jan-2016
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Elephant Toothpaste Every table needs:
Trash bag Glasses and gloves for each person Bowl Spoon
Once everyone is gloved and has their glasses on, send someone to Ms. Adabale to get: ½ cup hydrogen peroxide in a bottle Food coloring Dish soap 2 tablespoons of warm water
Go to your table and wait for further instructions!
Decomposition of Hydrogen Peroxide H2O2 H2O + O2 + heat
Catalyst Which of the following is a chemical reaction?1. rusting of iron2. chopping wood3. breaking a glass4. mixing baking soda and vinegar5. Shredding a piece of paper6. baking a cake7. crushing a can8. melting an ice cube9. mixing sand and water10. cooking an egg11. dissolving sugar and water12. burning wood
Chemistry Mini-Lesson: Reactions & Catalysts
Chemical Reaction: process by which atoms or compounds are reorganized into different atoms/compounds. Photosynthesis Reaction
6CO2 + 6H2O + Light C6H12O6 + 6O2
C
C
C
C
C
C
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
H
H
H
H
H
H
H
H
H
H
H
H
C
C
C
C
C
C
H
H
H
H
H
H
H
H
H
H
H
H
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
Reevaluate your list!1. rusting of iron2. chopping wood3. breaking a glass4. mixing baking soda and vinegar5. Shredding a piece of paper6. baking a cake7. crushing a can8. melting an ice cube9. mixing sand and water10. cooking an egg11. dissolving sugar and water12. burning wood
Chemical Reactions Clues that a chemical reaction has taken
place: Something new is visibly produced
Example: baking a cake
A gas is createdExample: baking soda and vinegar
Heat is given off or taken inExample: thermite reactionhttp://www.youtube.com/watch?v=o8gapa8ibK0
Reevaluate your list!1. rusting of iron2. chopping wood3. breaking a glass4. mixing baking soda and vinegar5. Shredding a piece of paper6. baking a cake7. crushing a can8. melting an ice cube9. mixing sand and water10. cooking an egg11. dissolving sugar and water12. burning wood
Reactants and Products Photosynthesis Reaction:
6CO2 + 6H2O + Light C6H12O6 + 6O2
The arrow always points from reactants to products.
Reactants(Starting Substances)
Products(Formed Substances)
Chemical Reactions1. rusting of iron2. chopping wood3. breaking a glass4. mixing baking soda and vinegar5. Shredding a piece of paper6. baking a cake7. crushing a can8. melting an ice cube9. mixing sand and water10. cooking an egg11. dissolving sugar and water12. burning wood
Activation Energy Activation Energy: minimum amount of energy (usually
heat) required to start a reaction.
***For both reactions, activation energy is measured from reactants to peak.
Reaction Progress
Energy
Reactants
Products
XY
X+Y
ActivationEnergy
Products can absorb
energy
Reaction Progress
Energy
Reactants
Products
XY
X+Y
Activation
Energy
Products can release
energy
Products that absorb energy feel COLD (endothermic) Products that release energy feel HOT (exothermic)
Chemistry Mini-Lesson: Reactions & Catalysts
If a reaction doesn’t get enough activation energy, it can’t start! 2 Options
Add more energy Lower activation energy
Catalyst: Lowers activation energy of a chemical reaction resulting in a faster reaction rate
Reaction Progress
Energy
Reactants
Products
XY
X+Y
Without
Catalyst With
Catalyst
Thinking Back… What were the reactants?
What were the products?
Was the reaction endothermic or exothermic?
Was there a catalyst? If so, what?
How do you think changing the amount of hydrogen peroxide would alter the experiment? Yeast?
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