(14-1) Types of Mixtures

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(14-1) Types of Mixtures : 

(14-1) Types of Mixtures Ms. Rania Abdelbaqi - ATHS/RAK

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Matter Mixtures Homogeneous Mixtures (Solutions) Heterogeneous Mixtures Pure Substance Elements Compounds Ms. Rania Abdelbaqi - ATHS/RAK Suspensions Colloids Mixtures: two or more substances mixed with no fixed composition.

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Homogeneous Mixtures (Solutions) Heterogeneous Mixtures Colloids Suspensions Blended evenly, mixed well. Very small particles (<1nm) Not blended evenly, substances can be distinguished. Big particles (>1000 nm) Settle out. Intermediate particles (1-1000 nm) Don’t settle out. Ms. Rania Abdelbaqi - ATHS/RAK Can be filtered. Can’t be filtered. Mixtures

[A] Heterogeneous Mixtures: : 

[A] Heterogeneous Mixtures: Suspensions: Ms. Rania Abdelbaqi - ATHS/RAK Heterogeneous mixture with Big particles (>1000 nm), settle out of mixture. Salad dressing, muddy water, fresh juices… Not blended evenly, substances can be distinguished.

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Suspensions. Thixotropic suspensions: Ms. Rania Abdelbaqi - ATHS/RAK Contain a solid that settles out from liquid if left undisturbed, but when mixed again, flows like a liquid.

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Colloids: Ms. Rania Abdelbaqi - ATHS/RAK Heterogeneous mixture with intermediate particles (1-1000 nm), don’t settle out. Paints, fog, blood, soaps, milk, marshmallow, smoke, cheese, gelatine, mayonnaise, dust in air…

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Ms. Rania Abdelbaqi - ATHS/RAK Colloids: Dispersing Medium Dispersed Particles

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Ms. Rania Abdelbaqi - ATHS/RAK Brownian Motion: is the jerky, random movements of particles in a colloid, because of particle collisions. Ex: Pollen grains in water.

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Ms. Rania Abdelbaqi - ATHS/RAK Tyndall Effect: is the scattering of light by dispersed particles, in colloids and suspensions.

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Ms. Rania Abdelbaqi - ATHS/RAK Question: Why don’t colloid particles settle out? Answer: The random movements The repulsion between same charges. The smaller size.

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Ms. Rania Abdelbaqi - ATHS/RAK

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Ms. Rania Abdelbaqi - ATHS/RAK [B] Homogeneous Mixtures (Solutions): Substances blended evenly, with Very small particles (<1nm) Solute: substance that dissolves. ex: salt Solvent: dissolving medium. ex: water

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Ms. Rania Abdelbaqi - ATHS/RAK Soluble: a substance that can dissolve. Insoluble: a substance that does not dissolve.

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Ms. Rania Abdelbaqi - ATHS/RAK Miscible: liquid soluble in another liquid. (solution) Immiscible: liquid that separates from another liquid. (suspension)

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Ms. Rania Abdelbaqi - ATHS/RAK

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Ms. Rania Abdelbaqi - ATHS/RAK Part of sea water is heterogeneous: big particles that settle out like dirt. Other part is homogeneous, like salts dissolved in water, evenly blended. Suspensions: Big particles (>1000 nm), settle out, can be filtered. Colloids: medium particles (1-1000 nm), don’t settle out, can’t be filtered. Types of solutions (Table 14-2). All solutions are homogeneous mixtures of two or more substances that are evenly blended.

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Ms. Rania Abdelbaqi - ATHS/RAK Fog as a colloid, would scatter light. When high beams are scattered, they reflect back at the driver making it harder to see. Refer to table (14-1). Refer to slide 10. Brownian motion is caused by collisions between the dispersing medium and the dispersed particles.

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Ms. Rania Abdelbaqi - ATHS/RAK