homework for week of jan 24-28 mon s. learn chemical vs. physical change tues c. lab day chemistry...
TRANSCRIPT
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Homework for week of Jan 24-28Mon
S. LearnChemical vs. Physical Change
TuesC. Lab Day
Chemistry Current Event due Thursday
Weds Review
Th Bond Test
FriCSA
Present
Progress Reports 1 week from today
• Please place Balancing Equations 101 out to be collected.
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•Explain the difference between
Physical Change Physical Change
andand
Chemical ChangeChemical Change
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Physical Change
A change in a substance that does not change
the identity of the substance.
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Physical Change
Examples:
•Ice melting
•Ripping paper in half
•Mixing ice tea mix in water
•Chewing your food
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Chemical Change
A change in a substance that results in a new
substance being formed.
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Chemical Change
Examples:
•Burning a match
•Cooking food
•Rust forming
•Digesting food
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Physical Change or Chemical Change ? You decide..
Chemical changeBurning the wick of a birthday candle
Physical changePutting salt on the icy sidewalk
Physical changeThe melting wax on a candle
Chemical changeBaking a cake
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Physical Change or Chemical Change ? You decide..
Physical changeColoring in a coloring book
Chemical changeBleaching your hair
Physical changeCutting your hair
Physical changeSawing a piece of wood
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Chemical changes create
new substancesnew substances.
New substances are the result of a
chemical reactionchemical reaction.
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Mg(s) + 2 HCl(aq) → MgCl2 (aq) + H2(g)
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Another example :
Electrolysis of water produces new substances known as
Hydrogen and Oxygen gasHydrogen and Oxygen gas
(H2) (O2)
2H2O(l) --> 2H2(g) + O2(g)