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Nature of Matter

Nature of Matter. Tiffaney Mathis Adrian P. Defante. Objectives. Knows the weight of an object is always equal the sum of its parts (Standard 1, Strand 3) Knows that different materials can be physically combined to produce different substance (Standard 1, Strand 4)

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Nature of Matter

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  1. Nature of Matter Tiffaney Mathis Adrian P. Defante

  2. Objectives • Knows the weight of an object is always equal the sum of its parts (Standard 1, Strand 3) • Knows that different materials can be physically combined to produce different substance (Standard 1, Strand 4) • Knows the differences and similarities between mixtures and solutions (GLE)

  3. Vocabulary • Mixture • Heterogeneous • Homogenous • Normal Solution • Solubility • Solvent • Solute • Colloid – 1 phase system of two or more components • Surfactant – surface active molecule or linker

  4. Mixtures and Solutions • What is a Mixture • In the broadest sense, Combination of two or more substances not chemically united, NO EXCHANGE OF ELECTRONS • Can be separated physically • Categories • Homogenous • Heterogeneous • Colloidal - Intermediate

  5. Homogenous vs Heterogeneous • Homogenous – mixture is of uniform appearance • Visual Examples • Sugar or salt in water • Why is this homogenous? • Heterogeneous – mixture is of different appearance • Visual Examples • Cookie Dough • What can you see in cookie dough that makes it heterogenous

  6. Colloidal Solutions • What is a colloidal solution • Contains solvent and a solute • 2 or more components or ingredients appearing to be one homogenous phase • Appearance is uniform • What it is NOT • Not a chemical reaction • Components/Ingredients do not mix naturally together Make two things mix together that normally do not

  7. Name some mixtures • Colloidal Solutions • Paint (metal in latex) • Mayonnaise (oil in vinegar) • Soft Drinks (Carbon dioxide in Water) • Normal Solutions • Sugar in water • Salt in water • Air (gasses are the only ideal/true solutions) So what is the difference if these are all mixtures?

  8. Difference between True and Colloidal Solutions Size Mayonnaise Sugar Solution Oil Molecule Sugar Molecule Water Molecule Water Molecule

  9. Vocab Connection Mixture – What is it? Classified into Heterogeneous – What is it? Homogenous – What is it? Between the two classifications are Colloidal Solutions Normal Solutions We can turn a colloidal solution to appear to be normal solution

  10. Lets Cook! – Investigating Mayo Like a chameleon, colloidal solutions can look like normal solutions

  11. Experiment • (1) Mix Sugar and Water • (2) Mix Oil and Water • What’s the difference • Describe these systems with the vocabulary used • (3) Mix Oil and Vinegar • (4) Mix Oil, Vinegar and beaten egg yolk

  12. How to combine two components together that normally do not mix? • Mayo Experiment - concepts enforced • Conclude that oil and water are immiscible and can not be mixed. • Remember the density column • Show that in real life, very few mixtures are true solutions • Expand the understanding that mixtures cannot simply be defined by looking at them • Explain the difference between a colloidal solution and a true solution. References: (1) http://www.iit.edu/~smile/ch9509.html (2) The American Chemical Society

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