CHEMICAL REACTIONS 8.5E – Investigate how evidence of a chemical reaction indicate that a new...
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CHEMICAL REACTIONS
8.5E – Investigate how evidence of a chemical reaction indicate that
a new substance with different properties has formed
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CHEMICAL REACTIONS:
Elements can combine to form new substances
Substances can be broken down into simpler substances
Atoms are re-arranged NOT created or destroyed
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CHEMICAL REACTIONS:Formulas and equations express what happens
What is written is a recombination of those atoms
Ex. O2 + 2H2O 2H2O
This “rearrangement” shows that new substances with new properties has been formed
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Remember: Law of Conservation
Mass of Reactants = Mass of Products
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CHEMICAL CHANGES
A change that produces new substances
Properties of the substances change
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Signs (Evidence) of a Chemical Change
Gas is formed/released
Change in odor
Change in temperature
A precipitate forms
Light is produced (flame, bioluminescence, glow sticks, explosions)
Change in color (unexpected)
Sound
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Common Misconception Alert!
Temperature change due to adding or removing heat does not represent a chemical change.
For example, melting or freezing is a change of state which is a chemical change.
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Specific examples that a chemical change has occurred:
GAS- baking soda and vinegar
COLOR CHANGE- rust
HEAT- fireworks (combustion)
SOLID- lead nitrate + potassium iodide = lead iodide (a precipitate)
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Gas is Formed
Elephant’s Toothpaste
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Gas Production
Flammable Water
Water = H2O. The batteries split the
H2 and the O. H2 = hydrogen.
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Change in Color
Steve Spangler – Color Change
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Change in Odor
Rotten Egg Lab
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A Precipitate is Formed
Golden Rain
Golden Rain Part 2
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Light is Produced
Surprize Fire
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Change in Temperature
X on Fire!
Thermite Reaction
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Several Examples in One
Multiple Reactions
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HW:
Read through the “Chemical Reactions” packet.
On the last page is a table to complete. Use the reading to help you fill in this table.
Due next class
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Now let’s observe a chemical reaction!
This is the student version of notes – what reaction we are doing is a surprise – you will just have to come class !