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Bellringer

Calculate the Density of an object if the Mass is 28.789mg and the volume is 0.00175l. Make sure your answer is in the correct units & sig figs. Bellringer. 5 Minutes to set up lab books for next experiment. Set up experiment 4 in your lab books (1 page)

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Bellringer

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  1. Calculate the Density of an object if the Mass is 28.789mg and the volume is 0.00175l. Make sure your answer is in the correct units & sig figs. Bellringer

  2. 5 Minutes to set up lab books for next experiment • Set up experiment 4 in your lab books (1 page) • Make sure to include table for qualitative observations. • Observations should be in complete sentences. • Blue or black ink only, no pencil • Need safety glasses only today, open toed shoes OK today only. • Take out experiment #5 and pass to center of the aisle.

  3. Chp. #3- Matter I. Classification of Matter Chapter #1, sec. 1.3 and 1.4 Chapter #3, sec. 3.1

  4. MIXTURE PURE SUBSTANCE yes no yes no Is the composition uniform? Can it be chemically decomposed? Colloids Suspensions A. Matter Flowchart MATTER yes no Can it be physically separated? Homogeneous Mixture (solution) Heterogeneous Mixture Compound Element

  5. B. Pure Substances • Element • composed of identical atoms • can’t be separated by physical or chemical means • EX: copper wire, aluminum foil

  6. B. Pure Substances • Compound • composed of 2 or more elements in a fixed ratio • properties differ from those of individual elements • EX: table salt (NaCl)

  7. B. Pure Substances • Law of Definite Composition • A given compound always contains the same, fixed ratio of elements. • Law of Multiple Proportions • Elements can combine in different ratios to form different compounds.

  8. B. Pure Substances Two different compounds, each has a definite composition.

  9. C. Mixtures • Variable combination of 2 or more pure substances. Heterogeneous Homogeneous

  10. Tyndall Effect C. Mixtures • Solution • homogeneous • very small particles • no Tyndall effect – light scattering due to colloids • particles don’t settle • EX: rubbing alcohol

  11. C. Mixtures • Colloid • heterogeneous • medium-sized particles • Tyndall effect • particles don’t settle • EX: milk

  12. C. Mixtures • Suspension • heterogeneous • large particles • Tyndall effect • particles settle • EX: fresh-squeezed lemonade

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