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Changes and Properties
Physical, Chemical, and Nuclear
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Physical Change
• Form or appearance changes, but the properties of the substance are the same (same melting point, chemical composition, etc.)
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Chemical Changes
• Identities of substances change during a reaction and new substances form
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Nuclear Changes
• Nucleus of the atom changes to form new elements
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Evidence of Chemical Change
• 1. Release of a Gas• 2. Formation of a Precipitate (powdery solid)• 3. Release or Absorption of Energy (heat or
light)• 4. Color Change
**Chemical Reactions
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Properties
• Property – characteristic (way to describe) an object or substance
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Physical Properties
• Those properties that we can determine without changing the identity of the substance we are studying
• Examples:• Hardness• Color• Melting Point• Density
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Chemical Properties
• Describe the way a substance can change or react to form other substances
• Examples• Flammable• Reacts with
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Station
What Happened Physical Chemical Nuclear
Why? (Evidence)
1 Rip paper
2 Fusion – 2 small nuclei combine to form 1 nucleus
3 Mix baking soda and vinegar - fizzes
4 Mix Pb(NO3)2 and NaOH – forms a white precipitate
5 Crumple paper
6 Burn copper – turns black on the end
7 Fission - 1 nucleus splits into several smaller nuclei
8 Dissolve salt in water
9 Melt ice