1 / 16

Unit 2 Continued

Unit 2 Continued. Matter/Physical vs. Chemical Changes/ Law of Conservation of Mass. Matter. Matter is anything that takes up space and has volume. 3 phases of matter: Solid Liquid Gas. Solids. Shape: tightly packed particles; very ordered Volume: definite volume

lucky
Download Presentation

Unit 2 Continued

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Unit 2 Continued Matter/Physical vs. Chemical Changes/ Law of Conservation of Mass

  2. Matter • Matter is anything that takes up space and has volume. • 3 phases of matter: • Solid • Liquid • Gas

  3. Solids Shape: tightly packed particles; very ordered Volume: definite volume Compressibility: incompressible Examples: coal; sugar; ice

  4. Liquids Shape: less tightly packed, less order, take container’s shape. Volume: indefinite volume Compressibility: low compressibility Examples: water

  5. Gases Shape: particles far apart, no order Volume: indefinite volume Compressibility: very compressible Examples: air, oxygen, CO2

  6. Phase Changes

  7. Entropy • Entropy is a measure of disorder. • The more order the particles have, the less entropic they are.

  8. Entropy Highest Entropy           Lowest Entropy Least Ordered           Most Ordered

  9. Physical Changes • Chemical composition remains the same. • Physical appearance or state of matter may change; but actual properties do not change. • Usually a reversiblechange.

  10. Examples of Physical Change: • Boil • Freeze • Crush • Dissolve • Melt • Bend • Condense • Split • Crack • Grind • Cut

  11. Chemical Changes • When a substance changes into a totally new substance. • The actual chemical composition is changed. • Cannot be easily reversed

  12. Indications of a Chemical Change: • Change in color or odor • Production of a gas (bubbles) • Energy released or absorbed (heat of light) • Formation of a precipitate (solid)

  13. Examples of Chemical Change: • Burn • Rot • Rust • Corrode • Explode • Decompose • Ferment

  14. Law of Conservation of Mass • Matter cannot be created or destroyed • The reactants and products must have equal masses.

  15. Law of Conservation of Mass • Reactants: The starting substances in a chemical reaction. • Products:Substances formed in a chemical reaction.

  16. Law of Conservation of Mass (Reactants)  (Products) Iron + Sulfur  Iron Sulfide 5g + 5g = 10g If you react 5g of iron with 5g of sulfur, 10g of iron sulfide will be produced.

More Related