Separating Mixtures - XTECBlocs
Compounds vs mixturesPhysics and ChemistryIES Jaume Salvador i PedrolFebruary 2009
CompoundsRemember that a compound is a substance made up from two ormore elements, chemically joined together.This means that compounds will always exist as molecules, notseparate atoms. The diagrams show some molecules of commoncompounds.make up constitute
MixturesA mixture is made from different substances that are not chemicallyjoined together - imagine coloured sweets which can be mixedtogether in a packet, but which are not chemically joined to eachother.The different substances in a mixture can be separated from eachother without needing a chemical reaction, in the way thatdifferent coloured sweets can be picked out and put into separatepiles.A packet of sweets contains a mixture of different colours
Mixture and compoundsMixtures have different properties from compoundsMixtureCompoundDefinite composition – youcannot vary the amount ofeach element in acompound.CompositionVariable composition – you canvary the amount of eachsubstance in a mixture.Joined or notThe different substances are not The different elements arechemically joined together.chemically joined together.PropertiesEach substance in the mixturekeeps its own properties.The compound hasproperties different from theelements it contains.SeparationEach substance is easilyseparated from the mixture.It can only be separated intoits elements using chemicalreactions.Air, sea water, most rocks.Water, carbon dioxide,magnesium oxide, sodiumchloride.Examples
Separating mixturesThe different substances in mixtures are usuallyeasily separated from one another.The method you use depends upon the type ofmixture you have.
Try to guess what is thesuitable method in eachcase.
FiltrationThis is good for separating aninsoluble solid from a liquid (aninsoluble substance does not dissolvein water).For example, sand can be separatedfrom a mixture of sand and waterFiltrationusing chemistry/elements com mix 8.shtml
EvaporationThis is good for separating a solublesolid from a liquid (a soluble substancedissolves in water to form a solution).For example, copper sulphate crystalscan be separated from coppersulphate solution usingEvaporation .Remember that it is the water that evaporates away,not the science/chemistry/elements com mix 8.shtml
Simple distillationThis is good for separating a liquid froma solution.For example, water can be separatedfrom salty water by .Simple distillationThis method works because the liquid evaporatesfrom the solution, but is then cooled andcondensed into a separate container.The salt does not evaporate and so it stays behind.
Fractional distillationThis is good for separating two ormore liquids from each other.For example, ethanol (alcohol) can beseparated from a mixture of ethanoland water byFractional distillation .This method works because the two liquids have different boiling ience/chemistry/elements com mix 8.shtml
Distillation apparatusCan you remember the names of their parts?water outputthermometrecondenserDestillationflaskBunsen burnerdistilledCool water intake
ChromatographyThis is good for separating dissolved substancesthat have different colours, such as inks andplant dyes.It works because some ofthe coloured substancesdissolve in the liquidbetter than others, so theytravel further up the paper.ink stainSeparation of the compounts of the ls/ks3bitesize/science/chemistry/elements com mix 8.shtml
Now, you have to write 5 questions about this topic in orderto ask some classmate Is the carbon dioxide a mixture? Is the carbon dioxide a substance made of molecules? Does a mixture need a chemical reaction to be separate? What happen when a solution is heated? Which part of a salt and water evaporates when it’s heated? What is a molecule? Which of this methods you have to use to .? How many methods of separation you know?
Diagram of separationoil sand saltAdd wateroil sand solution of salt and waterFiltration or decantationsandoil solution of salt and waterdecantationSolution of salt and waterevaporationoilsalt
Separating mixtures The different substances in mixtures are usually easily separated from one another. The method you use depends upon the type of mixture you have. Try to guess what is the suitable method in each case. . Microsoft PowerPoint - separating mixtures.ppt
mixtures 1. Types of mixtures Mixture ppt Source : www.northallegheny.org Accessed: 5/2/20 Extra scaffolding Break activities into manageable chunks Specific grouping Monitor work output in incrementsSeparation techniques ppt Encourage involvement Minimise choices Separating mixtures worksheet 2 Separating mixtures 2. Separation techniques 3.
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 .
separating mixtures. Explain how mixtures can be separated by physical methods, such as mixing, magnetic attraction, evaporation, filtration, distillation, chromatography, and settling. MIXTURES CHALLENGE Put the pictures (on the next page) in the box
mixtures such as drinks, food, and herbal medicines. Describe the appearance and uses of homogeneous and heterogenous mixtures Week 1-3 different techniques to separate mixtures separate desired materials from common and local products. Describe techniques in separating mixtures such as decantation, evaporation, filtering, sieving and using magnet
Fifth Grade: FOSS Physical Science - Mixtures and Solutions Investigation Title and Synopsis Concepts Assessments and TE Page Numbers 1. Separating Mixtures Students make mixtures of water and solid materials (salt, gravel, and diatomaceous earth) and separate the mixtures with screens and filters. They find that
Separating Mixtures – Exam Questions . 2012 - Higher Paper chromatography was used to find the composition of brown ink in a pen. The same liquid, paper and pen were used in each of the three experiments shown. They were started at different times, C first then B and finally A.
Sep 05, 2014 · Separating Mixtures To separate a mixture of olive oil and vinegar, for example, you could decant, or pour off, the oil layer. Or, you might cool the mixture until the oil turned solid. 2.2 Mixtures . Ch.2, Sec.2 Chemistry.ppt Author: Michael Varco Created Date:
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