physical and chemical change when a candle burns we see both physical and chemical change. physical...
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Physical and Chemical Change
When a candle burns we see both physical and chemical change.
PHYSICAL CHANGEWAX MELTING
CHEMICAL CHANGEWAX BURNS
What is a Physical Change?
Physical changes change the appearance of a substance and involve changes in size, shape or phase of matter.
Examples:
MELTINGICE MELTING
EVAPORATIONLAKE STEAMING
CONDENSATIONGLASS SWEATING
FREEZINGICE FREEZING
CHANGE SIZEGLASS BREAKING
CHANGE SHAPEMOLDING CLAY
PHASE CHANGES
What is a Physical Change?
They also occur during the mixing and dissolving of substances.
Examples:
MIXTUREIRON AND SAND
MIXTUREDISSOLVING
SUGAR OR SALT
Physical changes DO NOT change the chemical composition or identity of a substance.
No new substance is formed.
What is a Chemical Change?
In a chemical change:
One or more new substances are formed.
Change is difficult or impossible to reverse.
There is usually an energy change.
OBSERVATIONS
Color Change
Gas/Bubbles
Precipitate
Requires Heat ToHappen
Gives Off Heat
Produces Light
Original MaterialOr MaterialsDisappear
EXAMPLES
Zinc and HCL
Glycerol and Potassium permanganate
Lamp Burning Fuel
Common Examples of Chemical Change
Oxidation • Rusting• Tarnish
Burning Wood
OBSERVATIONS
Color Change
Original Material Disappears
Gives Off Heat
Produces Light
Original Material Disappears
EXAMPLES
Physical AND Chemical Changes
Like the burning candle, physical and chemical changes can be observed in a single process or situation depending on what you are looking at.
Example:PHYSICAL CHANGEBiting A Piece Of Apple
CHEMICAL CHANGEEnzymes and HCL
In Mouth and StomachBreaking Down Food
DIGESTION
Physical AND Chemical Changes
PHYSICAL CHANGEWearing Away of RockBy Water Over Time
CHEMICAL CHANGECarbonic Acid Eating
ThroughLimestone to Make
Caverns
ROCK CYCLE
Like the burning candle, physical and chemical changes can be observed in a single process or situation depending on what you are looking at.
Example:
Application: Physical or Chemical Change
Evaluate each picture as being a Physical or Chemical Change.
How about now?
Cutting an Egg Bending a Nail
Water Condensing Glass Falling and Breaking
Evaluate each passage as being a Physical or Chemical Change.
Application: Physical or Chemical Change
Dissolving sugar in water
Putting butter on hot toast
Clothes drying on a clothes-line
Milk going sour
Iron rusting
Ripping paper
Stomach acid breaking downan apple
PhysicalChange
ChemicalChange
Test your mastery and evaluate each as a Physical or Chemical Change.
Application: Physical or Chemical Change
Mixing Cake Mix Baking Cake Mix
VERSUS
Mixing Alka Seltzer in Water
Mixing Salt in Water
VERSUS