Grade 7 Science Unit 3: Mixtures And Solutions

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Grade 7 ScienceUnit 3: Mixtures and SolutionsChapter 9: Many useful products depend ontechnology for separating mixtures andsolutions.Name:Section #:1

Separating MixturesMixturesMethod of SeparationExplanation1. Salt WaterdistillationThe water will separate from thesalt2. Muddy Waterdistillation/filtrationThe water will separate from themud3. Nuts and Boltsby handNuts and bolts are differentsizes and easy to separate4. Iron filings and sandmagnetThe iron filings will be attracted tothe magnet.5.Vegetable oil and sandadd water, remove oil,filter water and sandOil separates from water andcan be removed, filtration willremove sand from water6. Vegetable oil and waterfloatation7. Salt and pepperoil and water separate and theoil floats to the top and can be removedSalt will sink in water and pepperwill float.floatationAre the components you have separated still mixtures or are they pure? Explain your answer.Some are now pure substances, but some are not. For example, the water separated byfiltration or distillation is now a pure substance, but the vegetable oil is not a puresubstance.Separation Techniques1.Mechanical SortingUsed to separate the parts of a mixture based on propertiesExamples: floatationand2magnetismsuch as particle size.

2.FiltrationA common way to separate solidparticles from a mixture.to microscopicFilters can have holes of varying sizes smallExamples: coffee filter, oil filter, furnace filter, colander3.EvaporationChanges of state from a liquidUsed to recover a solid4.solutegassolutionfrom aDistillationUses two changes of state:evaporationIt allows you to recover BOTH thesolution.5.to asoluteandcondensationand thesolventPaper ChromatographyUsed to separate the colouredsubstances in a mixture such as inkUsed to separate the solventsin a mixture.3from a

Separation Techniques in the Home (With a partner list as many methods of separation thatyou use.)Colanders, clothes dryers, window screens, coffee percolators, salad spinnersDistillationLabel the diagram below of a distillation apparatus and explain what is happening.CondensationEvaporationThe solution is heated so the solvent evaporates. Once it reaches the top of theflask it begins to cool and condense. The condensing solvent enters the tube andcondenses into the flask on the side. Once all the solvent has evaporated/condensedthe solute will be left in the original flask and the solvent will be in the flask on theright.4

Two types of DistillationSeparates a single solute from its solvent.Simple DistillationFractional DistillationSeparates a mixture of liquids based on their varyingboiling points.5

Grade 7 Science Unit 3: Mixtures and Solutions Chapter 9: Many useful products depend on technology for separating mixtures and solutions. Name: Section #: 2 Separating Mixtures Mixtures Method of Separation Explanation 1. Salt Water 2. Muddy Water 3. Nuts and Bolts 4. Iron filings and sand .

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