burning a candle - kyrene school district / best schools ... 31... · burning a candle •after...
TRANSCRIPT
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BURNING A CANDLE
• After melting, is the wax still
wax?
Yes, so Physical Change
• After burning, is the candle wick
still a candle wick?
No, so Chemical Change
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MR. BEAN MEETS CHEMISTRY
• As you watch the
video of Mr. Bean,
what are some
indicators of a
chemical change
(chemical reaction
that you notice)?
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SolidFixed VolumeFixed Shape
Least Kinetic Energy
LiquidFixed Volume
No fixed shapeModerate
Kinetic Energy
GasNo Fixed VolumeNo Fixed Shape
Most Kinetic Energy
Melting
BoilingEvaporating
Freezing Condensing
Sublimation
Deposition
Remember: States of matter changes are physical changes. The identify of the substance
stays the same.
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Physical and Chemical Properties of Matter
Physical Properties/Changes Chemical Properties/Changes
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Graphite — the layered structure of the carbon atoms gives graphite its physical properties.
The pattern of the atoms gives the
substance its physical properties.
Physical Properties
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Physical Properties
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Physical Changes– can be observed without changing the identity
of the substance( color, hardness, melting point & density)
– is only a change in any physical property of a substance
– matter can change from one state to another (liquid to a gas)
Some physical changes would be• boiling of a liquid• melting of a solid• dissolving a solid in a liquid • grinding or crushing• Condensation - when gas
becomes a liquid
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Physical Properties and Changes Recap
• The characteristics of a substance that can be observed without changing the identity of the substance are called physical properties.▫ Examples:
Color Shape Texture Volume Mass Density
• A physical change is any change in any physical property of a substance, not in the substance itself.▫ Examples
Breaking a piece of clay Stretching a rubber band Melting ice into liquid water Dry Ice sublimating into gas
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Chemical Properties and Chemical Changes
• Chemical properties of a substance are defined by the chemical changes it undergoes.
• Chemical changes transform the substance into a new identify.
• Chemical change or chemical reaction is the transformation of one or more atoms or molecules into one or more different molecules.
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Chemical Properties and Changes
• Chemical properties describe how substances can form new substances.
• A chemical property is any of a material’s properties that becomes evident during a chemical reaction.▫ Examples:
Combustibility (ability to burn) Easily oxidized (ability to rust) Toxicity (level of harm to organisms) Reactivity with other chemicals Types of chemical bonds that will form
• The change of one substance into another substance is called a chemical change.▫ Examples:
The burning of wood The rusting of iron Mixing baking soda and vinegar to produce carbon dioxide
gas
Physical and Chemical Changes
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Indicators of a
Chemical Change
• Color Change▫ Can be tricky to interpret▫ Some color changes are just a
mixture, not a chemical change Physical change – mixing food
coloring into water (mixture) Chemical change – iron
rusting due to oxygen (something new)
• Gas produced▫ Has to be a new substance, not
boiling!• Temperature change
▫ Gets hot – exothermic reaction▫ Gets cold – endothermic
reaction• Precipitate formed
▫ A solid is formed when reacting two or more fluids
• Odor change▫ A new smell!
• Light or sound production▫ Boom!
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Physical vs. Chemical
• Examples:
– melting point
– flammable
– density
– magnetic
– tarnishes in air
physical
chemical
physical
physical
chemical
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• Examples:
-rusting iron
-dissolving in water
-burning a log
-sublimation
-grinding spices
Chemical and Physical Change Practice Quiz #1
Chemical
Physical
Chemical
Physical
Physical
Practice Quiz #1; Practice Quiz #2
Physical vs. Chemical
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COMPLETE CHEMISTRY PACKET USING ONLINE
TEXTBOOK
Mr. Ganey’s Webpage Science Booknotes (Textbook) Chemistry Textbooks
Matter and Energy Textbook Chapter 2
Extension:
Make vocabulary flash
cards from Chapter 1
Study Guide (#1-18)
and Chapter 2 Study
Guide (#1-10)