Separation of a Mixture
Separation of a Mixture
Objectives
In this lesson, students will have an opportunity to synthesize the previous lesson’s content in a practical lab setting. They will use their knowledge of physical properties and mixtures to separate a heterogeneous mixture. Students will:
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differentiate between a pure substance and a mixture.
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create a lab procedure that enables them to separate a suspension based on the physical properties of its components.
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recognize that magnetism is a physical property of iron.
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recognize that solubility in water (at a given temperature) is a physical property of sodium chloride.
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recognize that sand does not dissolve in water, differentiating it from sodium chloride.
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perform a separation lab, following proper instructions and safety protocol.
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recognize that salt water is a solution and can be separated physically.
Essential Questions
Vocabulary
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Element: Pure substance consisting of one type of atom.
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Compound: Pure substance consisting of two or more different atoms.
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Mixture: Two or more different substances not chemically combined.
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Colloid: A heterogeneous mixture that exhibits the Tyndall effect.
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Magnetism: The force of attraction or repulsion between various substances, especially those made of iron and certain other metals; ultimately it is due to the motion of electric charges.
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Suspension: A heterogeneous mixture that has particles large enough to settle out.
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Solution: A homogenous mixture in which the particles are very small.
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Homogeneous Mixture: A mixture with a uniform composition.
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Heterogeneous Mixture: A mixture with a non-uniform composition.
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Element Symbol: An abbreviation for an element’s name found on the periodic table.
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Compound Formula: Represents the combination of two or more elements in fixed proportions. Subscripts designate the number of atoms of each element.
Duration
90 minutes/2 class periods
Prerequisite Skills
Materials
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goggles
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hot plate
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tweezers
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magnet
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large tongs
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oven mitt, hot pad, or protective glove
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water
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graduated cylinder (10-25 mL)
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weigh boats (4)
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100 mL Erlenmeyer flask
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funnel
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filter paper
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evaporating dish with mixture (75-150 grams)
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glass stir rod
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Separation of a Mixture–Student activity sheet (S-8-5-3_Separation of a Mixture Student.doc)
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Separation of a Mixture–Teacher activity sheet (S-8-5-3_Separation of a Mixture Teacher.doc)
Related Unit and Lesson Plans
Related Materials & Resources
The possible inclusion of commercial websites below is not an implied endorsement of their products, which are not free, and are not required for this lesson plan.
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Filter paper photo: http://seattlecentral.edu/faculty/ptran/pix/fold.jpg