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TOPIC: Solutions and Solubility Do Now : check out test grades

TOPIC: Solutions and Solubility Do Now : check out test grades. Matter. Pure Substanc es. Mixtures. Elements. Compounds. Homogeneous Mixtures. Heterogeneous Mixtures. Classification of Matter. VIDEO. Mixtures – can be separated by physical means.

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TOPIC: Solutions and Solubility Do Now : check out test grades

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  1. TOPIC: Solutions and SolubilityDo Now: check out test grades

  2. Matter Pure Substances Mixtures Elements Compounds Homogeneous Mixtures Heterogeneous Mixtures Classification of Matter VIDEO

  3. Mixtures – can be separated by physical means • Heterogeneous Mixture: See visibly different regions • Particles random • Settles upon standing • Scatters light (it doesn’t shine through) • Homogenous Mixture (aka SOLUTION): particles too small to see • Particles evenly distributed • Particles do not settle • -translucent (light shines through)

  4. CuSO4(aq)

  5. Water is often used as a solvent Not everything dissolves in water • Soluble = dissolves in water = aq • Insoluble = doesn’t dissolve in water • Miscible = 2 liquids that dissolve • Immiscible = 2 liquids that don’t dissolve

  6. How can you tell….?!!!?? • Like Dissolve Like • Water is polar, so most polar compounds will dissolve in water • Things that dissolve in water • Soluble ionic compounds – use Table F • Acids - start with H except H2O H2O2 • ex HCl • Bases - metal + OH and NH3 • ex. NaOH • Polar covalent molecules • Remember polar = asymmetrical = poles nonpolar = symmetrical = no poles

  7. Determining if an ionic compound is soluble (aq) or NOT • LOOK AT TABLE F • LiOH • Cu(NO3)2 • AgCl2 • MgS • NaS2 • KOH • aq • aq • Insoluble = s • Insoluble = s • aq • aq

  8. Solubility = the max amount of solute that can be dissolved in a solvent • Many solidsand gases dissolve in water • As you increase the temperature, you can dissolve more solid • Does this work the same with gas? • NOT the same for gases – as you increase temp, gas molecules KE • To get gases dissolve, decrease temperature and increase pressure

  9. Summary: Factors Affecting Solubility • Nature of the solvent and the solute: LIKE DISSOLVES LIKE • Temperature • Pressure (for systems with gases)

  10. Solubility curves show the relationship between solubility and temperature. • Can you guess which of these compounds are gases?! How do you know?!

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