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Properties of Matter: Physical & Chemical Changes

Discover the nature of matter, physical and chemical properties, changes in matter, examples, and how to differentiate between physical and chemical changes. Explore the properties and changes of matter in depth!

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Properties of Matter: Physical & Chemical Changes

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  1. Properties and Changes of Matter

  2. The Nature of Matter Matter is anything that takes up space and has mass. You can observe matter easily with your senses . . . rocks, trees, bicycles, air . . . Basically everything and anything! What is matter? ExamplesofMatter: The only thing that wouldn’t be matter would be energy (sunlight, heat, electricity). - no mass or volume so they can’t be matter!

  3. Physical Properties Physicalproperty is a property that can be easily observed without changing the identity of the substance. Examples: • viscosity • conductivity • malleability • hardness • magnetism • melting point • boiling point • density • color

  4. Examples of Physical Properties A. Solubility of a substance is its ability to dissolve. Example: sugar in water B. Conductivity is a material’s ability to allow heat or electricity to flow. Examples: metal = high conductivity wood = poor conductivity

  5. Examples of Physical Properties C. Malleabilityof a substance is its ability to be hammered into a thin sheet D. Melting and Freezing pointsare the temperatures at which a solid becomes a liquid and a liquid becomes a solid. E. Density of a substance is a measure of how close together its particles are. Low density = float High density = sink

  6. Physical Change A change in the appearance, without changing the identity of the material. • Can be reversible, or irreversible • Substance may seem different, but the way the atoms link up is the same. It is a physical change if . . . • It changes shape or size • It dissolves. • Or the substance changes phase.

  7. Chemical Properties Examples of chemical properties . . . Chemicalproperty is any ability to produce a change in the identity of matter. reactivity flammability Corrosive: Eating away, such as a metal by acid Material’s ability to burn in the presence of oxygen. How readily a substance combines chemically with other substances.

  8. Chemical Changes Chemicalchanges occur when a substance reacts and forms one or more new substances. You know a chemical change has occurred when there is. . . • A change in color or odor. • Production of a gas (bubbling). • Formation of a precipitate (solid). • Absorb or release energy (gets hot or cold or light is given off).

  9. Examples of Chemical Changes: Burning Or Combustion: Color change, odor change, Produces a gas, gets hot Rusting: Color change Corroding: Color change Digesting: Color change, odor Change, produces a Gas, releases energy Molding: Color change Decaying: Color change

  10. What kind of change is it? A physical

  11. What kind of change is it? chemical B

  12. What kind of change is it? physical C

  13. What kind of change is it? physical D

  14. What kind of change is it? chemical E

  15. What kind of change is it? physical F

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