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Matter

Matter. Chapter 2.1. Chapter 2.1. Matter 3 states of matter (technically 4) Physical Change Key words: cutting, grinding, smashing, tearing, boiling, melting, freezing, solidifying, condensing, splitting, cracking, bending, etc. Mixtures – Section 2.2. Mixture :

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Matter

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  1. Matter Chapter 2.1

  2. Chapter 2.1 • Matter • 3 states of matter (technically 4) • Physical Change • Key words: cutting, grinding, smashing, tearing, boiling, melting, freezing, solidifying, condensing, splitting, cracking, bending, etc.

  3. Mixtures – Section 2.2 • Mixture: • A physical blend of two or more substances. • Example: dinner salad with tomatoes or celery, and salt water

  4. Mixtures, cont. • Heterogeneous mixture: • Is one that is not uniform in composition. • Example: salad • Homogeneous mixture (aka solutions): • One that has a completely uniform composition. • Example: salt water

  5. Chapter 2.3 • Elements: • The simplest forms of matter that can exist under normal laboratory conditions. • Elements are represented with a one or two letter chemical symbol. • Example: Na, S, K, Ag, etc. • Compounds: • Substances that can be separated into simpler substances only by chemical means. • Example: NaCl, H2O

  6. Classifying Mixtures Schematic Matter Mixtures Pure Substances Elements Compounds Heterogeneous Homogeneous

  7. Chapter 2.4 • Chemical Reaction: • One or more substances are changed into new substances. • Products: • Substances formed • Reactants: • Starting substances

  8. Chemical Property • Chemical Property: • The ability of a substance to undergo a chemical reaction and to form new substances. • A chemical change alwaysresults in a change of chemical composition. A chemical property is only the ability for a substance to undergo this change. • Example words for a chemical change: burn, rot, rust, decompose, decay, ferment, explode, corrode

  9. Law of Conservation of Mass • Law of Conservation of Mass: • Mass is neither created nor destroyed, it only changes forms. • ALL chemical reactions exhibit this!!

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