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Chemistry: The Study of Matter and its Transformations

Explore the composition of matter and the changes it undergoes through physical and chemical processes. Learn about the different states of matter, elements, compounds, mixtures, and the laws that govern them.

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Chemistry: The Study of Matter and its Transformations

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  1. Chemistry The study of the composition of matter and the changes that matter undergoes.

  2. Matter Anything that has massand takes up space.

  3. Mass The amount of matter an object contains.

  4. Physical State (see Table 2.2) Solid: definite shape and volume Liquid: Takes on shape of container, definite volume Gas: Fills any space; compressible

  5. Gas vs. Vapor A vapor is the gaseous state of a substance that is generally a liquid or solid at room temperature (i.e.water vapor).

  6. Substance Matter with a uniform and definite composition (also called a pure substance). All samples of a substance have identical physical properties.

  7. Compound OR Substances can be either Element C Al2O3-Cr

  8. Elements Simplest forms of matter. Building blocks for all other substances. Cannot be separated by chemical means. Represented by a one- or two-letter chemical symbol.

  9. Compounds Can be separated into simpler substances by chemical means.

  10. Mixture A physical blend of two or more substances. Can be separated by physical means. Compositions may vary.

  11. Homogeneous Mixture Completely uniform composition. Also known as a solution.

  12. Heterogeneous Mixture Not uniform in composition.

  13. Classifying Matter

  14. Physical Property- quality or condition that can be observed or measured without changing the substance’s composition. For example: Color Solubility Hardness Density Melting point Boiling point Physical state

  15. Does NOT depend on the amount of material present (e.g. color, melting point, freezing point, density) INTENSIVE physical property

  16. DOES depend on the amount of material present (e.g. mass, volume) EXTENSIVE physical property

  17. Physical Change- Alters a given material without changing its composition. Cutting Grinding Bending Melting Boiling Freezing

  18. Chemical Reaction One or more substances change into new substances

  19. Reactants Starting substances in a chemical reaction.

  20. Products Resulting substances in a chemical reaction.

  21. The ability of a substance to undergo chemical reactions and to form new substances. Chemical Property

  22. Chemical Changes Result in a change of chemical composition of the substances involved. Most chemical changes are not easily reversed. Ex: Rust, Burn, Rot, Explode, Corrode

  23. Signs of a Chemical Change Signs of a Chemical Change     1. Light and/or Heat 2. Produces a Gas 3. Produces a Precipitate (a solid that settles out of a solution) 4. A permanent, unexpected color change

  24. Law of Conservation of Mass In any physical change or chemical reaction, mass is neither created nor destroyed. The mass of the products is always equal to the mass of the reactants.

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