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Which explains why mixtures can be separated?

Can mixtures solutions be separated? - Mvorganizing

A mixture is made when two or more substances are combined, but they are not combined chemically. The components of a mixture can be easily separated. The components each keep their original properties. The proportion of the components is variable Chromatography can be used to separate mixtures of coloured compounds . As the solvent soaks up the paper, it carries the mixtures with it. Different components of the mixture will move at different rates. This separates the mixture out. How many main ways are there to separate mixtures? Mixtures can be separated using a variety of techniques Distillation is an effective method to separate mixtures comprised of two or more pure liquids. Distillation is a purification process where the components of a liquid mixture are vaporized and then condensed and isolated. In simple distillation, a mixture is heated and the most volatile component vaporizes at the lowest temperature A racemic mixture is a 50:50 mixture of two enantiomers. Because they are mirror images, each enantiomer rotates plane-polarized light in an equal but opposite direction and is optically inactive. If the enantiomers are separated, the mixture is said to have been resolved Heterogeneous Mixtures:-These are the type of mixture in which two or more compounds are mixed unevenly or unequally. For example Oil in water and Sand in water. Methods of Separation of Mixtures. The process or methods of separation of different components of a mixture by the physical method is known as the separation of mixtures

Which explains one reason evaporation can be used to separate a mixture? The desired component has a higher boiling point than the other components. The desired component has a different density from the other components. The mixture is a solution that contains a substance that will crystallize out Filtration is used to separate a solid from a liquid in which it is suspended. Filtration is also used to separate a substance from a mixture because one is insoluble in the solvent and the other is soluble.the separation is due to particle size. 3.for example the separation of sodium chloride from a mixture of sodium chloride and sand The mixture is a solution because it has the same appearance throughout the sample. The mixture is a suspension because it is composed of two different-appearing substances. The mixture is a heterogeneous mixture because one liquid is dissolved in the other. The mixture is a colloid because two different substances can be seen in a small sample

Circle which of the following mixtures can be separated by extraction with an aqueous NaOH solution, and briefly explain why? Mixture 1 Mixture 2 Mixture 3 cola ola bo TOH and and and NH2 NH2 ОН . This problem has been solved! See the answer See the answer See the answer done loading Purpose of Separation of Substances. There are three main reasons why we need to separate mixtures.They are: 1) To remove unwanted particles. A bhel is a mixture of various ingredients like onion, tomato, potato, chillies, etc. Someone who does not like spicy food will remove the chillies to prevent mouth burn.Therefore, separation is necessary to remove the chillies from food A mixture is made from different substances that are not chemically joined. For example, powdered iron and powdered sulfur mixed together makes a mixture of iron and sulfur. They can be separated.. Circle which of the fo briefly explain why? llowing mixtures can be separated by extraction with an aqueous NaOH solution, and Mixture1 Mixture 2 Mixture 3 он and and and HN NH2 NH2 о Mixtures are unlike chemical compounds, because: The substances in a mixture can be separated using physical methods such as filtration, freezing, and distillation. There is little, see Enthalpy of mixing, or no energy change when a mixture forms

Why can some mixtures be separated by chromatography

Filtration is a method for separating an insoluble solid from a liquid. When a mixture of sand and water is filtered: the sand stays behind in the filter paper (it becomes the residue) the water.. An azeotropic mixture cannot be separated into its components by fractional distillation because, when an azeotrope is boiled, the vapor has the same proportions of constituents as the unboiled mixture. Can we separate Azeotropes by fractional distillation explain? We cannot separate the compounds of azeotropic mixture by fractional distillation Chromatography. is the separation of a mixture by passing it in solution or suspension or as a vapor through a medium in which the components move at different rates. Distillation. a purification process where the components of a liquid mixture are vaporized and then condensed and isolated. Evaporation

Methods for Separating Mixtures Chemistry for Non-Major

Year 8, Chemistry - Learn Science

Blood is a mixture that can be separated by a machine called a centrifuge into its two main parts: plasma and red blood cells. Homogeneous Mixture. Mixtures having a uniform composition in all through the substance are called Homogeneous Mixtures. For instance - a mixture of salt and water, a mixture of sugar and water, air, lemonade, soft. Some Mixtures That Can Be Decanted . Oil and water: Oil floats on top of water. Decanting the mixture allows the oil to be poured off the water. Gasoline or kerosene and water: This mixture is an example often cited as a safety hazard.Decanting a mixture containing flammable solvents can be dangerous, as the flammable material evaporates and forms dangerous fumes

The constituent elements of a compound can only be separated by means of a chemical reaction that breaks the atomic bonds that bind its molecules. The ingredients of a mixture can be separated by physical means such as sedimentation or decantation Compounds can be separated on the basis of density, physical phase, and chemical affinity - what things tend to stay together due to their chemical structure and properties.. Filtration separates solids from liquids. This is a physical separation based on density. Evaporation is really just creating the conditions for solid precipitation and removal The mechanism involves taking advantage of the unequal density of the particles in the mixture. Oil and water can be easily separated using this technique. Magnetic Separation. When one substance in the mixture has some magnetic properties then this method is quite useful. Strong magnets are commonly used to separate magnetic elements

Why or why not? Explain your answer. b. Briefly describe the procedural steps (step1, step 2, etc.) you would take to separate the components of a mixture of benzoic acid and Na 2 SO 4 and recover the two separated substances. 3. Explain whether the following parts of the mixture separation involved a physical or a chemical change. a. Most natural substances are mixtures. In the graphic on the left there are four substances - water, alcohol, oil, and food color dye. MIXTURES PURE COMPOUNDS: A mixture can be physically separated into pure compounds or elements. A pure compound has a constant composition with fixed ratios of elements

In this regard, why does ink separate in chromatography? Ink is a mixture of several dyes and therefore we can separate those colors from one another using chromatography.When ink is exposed to certain solvents the colors dissolve and can be seperated out. When we expose a piece of paper with ink on it to a solvent, the ink spreads across the paper when the ink dissolves Which statement explains why oxygen can be separated from nitrogen by the fractional distillation of liquid air? A. Oxygen is more dense than nitrogen. B. Fractional distillation is a process of separation of mixtures based on the difference in their boiling points In many cases, mixtures can be interpreted more reliably with PGS than without it, if the analyst understands the assumptions made by the software and the underlying mathematics. This makes PGS an extremely important tool, and one that can help investigators solve many crimes that might otherwise go unsolved

Certain mixtures can be separated physically like filtering, boiling, magnetism, etc. When something is separable by magnetism, it is physically attracted to the magnet. There is no chemical change going on. Compounds, on the other hand, are pure substances that require energy to break.. In the case of iron, it forms ionic compounds so the energy required to break the bonds of 1 mole of the. The mixtures of solid substances with one sublimable material and other non-sublimable material can be separated by sublimation. Examples of sublimable substances- ammonium chloride, camphor, iodine, naphthalene, anthracene etc Lesson Summary. Since mixtures are formed by the physical combining of substances, they can also be physically separated. The most appropriate technique for separating a mixture depends on the type of mixture and the physical properties of the components Mixtures can also be separated by chemical methods which involve selective reaction of one the of the components to form a new substance. The physical properties of the new substance can then be used toseparate it from the mixture. Once separated, a second reaction converts the new substance back to the original component

Distillation uses boiling to separate mixtures of liquid solutions. It takes into account that different substances in the mixture will have different boiling points. For example, if you heat salt water the water in the solution will boil before the salt. The water will then evaporate leaving the salt behind For innumerable reasons. You cannot do without salt in food. How do you get it? You simply buy it. Very easy. Common salt is just an example. It occurs in sea water. It is obtained by evaporating sea water. It is separation of components. How do y.. DAY 2 : Describe the ways on how mixtures can be separated. TOPIC: Techniques in Separating Mixtures Mixtures are made up of two or more substances that are physically combined. soil rocks Techniques in Separating Mixtures One of the major concerns of chemistry is how to utilize and produce pure substance from mixtures. Most substances in a mixture are physically combined, so the ways in.

5.8: Resolution: Separation of Enantiomers - Chemistry ..

Separation Techniques. A separation process or technique is a method that converts a mixture or solution of chemical substances into two or more distinct product mixtures. At least one of results of the separation is enriched in one or more of the source mixture's constituents. In some cases, a separation may fully divide the mixture into. How can we separate a mixture of two miscible liquids Separation of mixture of two or more liquid All the mixtures containing two (or more) liquids can be separated by the following two methods: By the process of fractional distillation. By using a separating funnel. 1. Miscible liquids : Those liquids which mix together in [ Ans: A mixture is a material composed of two or more simpler substances in chemistry. Such materials can be compounds or chemical elements. A mixture of liquids, solids, or gases can be produced. When sugar is put in water, for example, it forms a mixture, then it dissolves to create a solution Solution for 1. Explain how to separate the following mixtures: a. How will you separate naphthalene from sand from the naphthalene- sand mixture Define element, mixture and compound. Explain the differences between pure substances and mixtures. Explain the characteristics of the mixtures. Give some examples of elements, mixtures and compounds. Define the homogeneous and heterogeneous mixtures and give some examples. Explain in general how mixtures can be separated

Separating Mixtures - Medium Demand Questions 1. Pebbles, salt and sand (a) Joanne has a dry mixture of pebbles, salt and sand. She has these four pieces of equipment to help her separate the mixture A recycled can, can appear as a brand new can within of month of the recycling process. Aluminum foil and foil packaging can be recycled, which is a common misunderstanding. Make sure it's free of food debris. This material can be re-processed into aluminum mechanical components, like engine parts. Paint cans, aerosol cans are recyclable

Separation of Mixtures - Different Methods, Examples and FA

  1. No. Filtration is used for simple mixtures like coal and rock. To separate water and sugar evaporate water leaving you with sugarClarification:Yes, you can. By pumping the water through a series.
  2. However, a mixture can be separated again by physical means. Evaporation is one easy method to separate the sugar from the water. If one boils this solution, only the water will evaporate out of.
  3. (ii) The components of a mixture can be separated by simple physical methods. For example, the components of air can be separated by fractional distillation of liquid air. (iii) The composition of a mixture is variable. The composition of air is also variable. It has more oxygen in the country side than in big cities
  4. 1. Milk is a homogeneous mixture (a solution) and not a compound. Explain this statement. Milk is NOT a compound because milk can be purchased with different compositions. Whole, 2%, skim, nonfat are all varieties of milk that can be purchased. Compounds always have a definite composition while mixtures can have any % composition. 2
  5. Explain why the sand can be separated by filtration but salt cannot [1 mark]S 2 A mixture of inks was separated using filter paper. The results of this are below. a

Regarding this, why does ink separate in chromatography? Ink is a mixture of several dyes and therefore we can separate those colors from one another using chromatography.When ink is exposed to certain solvents the colors dissolve and can be seperated out. When we expose a piece of paper with ink on it to a solvent, the ink spreads across the paper when the ink dissolves Mixture is a combination of two or more substances that are not chemically united and do not exist in fixed proportions to each other. Sugar solution is a mixture because it can be separated into sugar and water by the method of evaporation. They show the properties of their constituent components ie., sugar and water because they taste sweet. Explain how chromatography is used to separate components in a mixture. Chromatography separates components in a mixture according to their solubility in the mobile phase and their adsobance to the stationary phase. The mobile phase is the part of the chromatography set up that moves; the stationary phase is the part of the set up that does not. This technique can be used to separate two liquids when they have different freezing points. For example, a mixture of oil and water can be separated by placing it in the freezer. The water will freeze but the oil will not. The ice can be removed leaving the oil behind. Chromatography . Chromatography is a very useful method for separating.

3. Introduce the concept of a mixture. A mixture is formed when two or more substances are combined, but those substances are not changed. The components of a mixture (such as the marbles, sand, and water) can be separated based on their physical properties using a variety of techniques. Note: students shoul a mixture and of vinegar in water can be separated by - Chemistry - TopperLearning.com | iduxjbrr. Starting early can help you score better! Separation of Solid-Liquid Mixtures. This video explains evaporation to separate solid-liquid mixtures. Separation of Liquid-Liquid Mixtures - Part 1 One example of a mixture is air. Air is a homogeneous mixture of the gaseous substances nitrogen, oxygen, and smaller amounts of other substances. Mixtures are unlike chemical compounds, because: The substances in a mixture can be separated using physical methods such as filtration, freezing, and distillation They can however be separated by chemical methods. (b) Mixtures: (i) Mixtures are formed by simply mixing two or more constituents. There are no chemical reactions between the constituents. (ii) The properties of a mixture are same as those of its constituents. (iii) The components of a mixture may be present in any ratio

Which explains one reason evaporation can be used to

If these liquids have very different boiling points, when the mixture starts to boil, the vapor is rich with the molecules of the more volatile component. This phenomenon is often used to separate mixtures using simple distillation, where a mixture of two miscible liquids is heated and the vapor is then condensed back to liquid and collected Use knowledge of solids, liquids and gases to decide how mixtures might be separated, including through filtering, sieving and evaporating. Demonstrate that dissolving, mixing and changes of state are reversible changes. Concepts supported. Children will learn: That there are various techniques that can be used to separate different mixtures Mixtures are everywhere. The definition of a mixture is a combination of different things that are not chemically bonded. For example, when we bake a cake, it's a result of a mixture of eggs, flour, sugar, and other ingredients. Mixtures can also be much simpler than that. Any time two or more items are combined, a mixture is formed

What type of mixtures can be separated by filtration

A heterogeneous mixture is a mixture in which the components of the mixture are not uniform or have localized regions with different properties. Different samples from the mixture are not identical to each other. There are always two or more phases in a heterogeneous mixture, where you can identify a region with properties that are distinct from those of another region, even if they are the. Let the mixture rest and the oil and water will separate. An emulsifying agent (emulsifier) is any substance that keeps the parts of an emulsion mixed together. Is sugar water a colloid solution or suspension? The sand sinks to the bottom. The sugar-water is a homogenous mixture while the sand-water is a heterogeneous mixture Musk realized there's no real reason why full-size autos can't be manufactured according to the same design philosophy. That is, Mr 'Make The Machine That Makes The Machine'. Reason of Giga Press. Finding these sorts of efficiencies is an Elon kind of job

Define element, mixture and compound. Explain the differences between pure substances and mixtures. Explain the characteristics of the mixtures. Give some examples of elements, mixtures and compounds. Define the homogenious and heterogeneous mixtures and give some examples. Explain in general how mixtures can be separated Individual components of a mixture can be separated out by a number of methods. These are: gravity separation: If the various components of the mixture have different gravity, they will form. Sand can be separated from the mixture of sand and salt by dissolving salt in water and then by filtration. Separation of salt: Real Lab Procedure: Transfer the filtrate in the beaker into a china dish and strongly heat it. After some time, the salt is left as a residue in the china dish; transfer it into another watch glass.. Mixtures of solvents are employed to achieve optimum separation by TLC. When using solvent mixtures it should be kept in mind that addition of only a minor amount of a polar solvent can result in a large increase in the eluting power of the mixture. Table 2. Solvents for chromatography Less Eluting Strength (less polar solvents Can be applied in the separation of volatile compounds and gaseous mixtures Usually carried out at room temperature so heat-sensitive compounds can be safely analyzed using the techniqu

Separation Of Mixtures Flashcards Quizle

  1. 11) A substance that can't be chemically broken down into simpler substances is A) a homogeneous mixture. B) an element. C) a heterogeneous mixture. D) a compound. E) an electron.Answer: B 12) A substance composed of two or more elements in a fixed, definite proportion is A) a homogeneous mixture. B) a heterogeneous mixture. C) a compound
  2. like size and shape to separate the pretzels from the mixture. However, even mixtures such as saltwater or lemonade may be separated by physical means. You will learn how to separate mixtures later in this companion. Try Now Take a little time to investigate some mixtures. 2. 3. 4. For this activity, you will need the following supplies
  3. Yes, air is a mixture because it is make up or more than one substance and those substances can be separated. Want to learn more, or understand why people are confused about whether air is a mixture or a compound? We'll explain in the article below
  4. and can be separated manually (i.e. through sorting, filtering, etc.). What if I told you that a mixture is created anytime two or more different substances or items are combined? Now do you think any of my lunch items would be considered a mixture? Why or why not? Students will participate in quiet group discussion. 4. Based on their knowledge o
  5. g the salt is all dissolved in the water, you can pass the mixture through a filter paper in a filter funnel to separate the sand. Boil off the water to get dry salt. Do it gently to avoid splattering. Recover the water (assu
  6. solutions and how they can be separated . Students will then go back to their ideas from activity one and further explain mixtures and solutions. Students will then research activities (historically and/or contemporarily) that affect the local watershed and provide examples of substances that create mixtures and solutions and how they affect loca
  7. liquids can be separated by distillation because the 12Which statement explains why Br2 is a liquid at STP 20At room temperature, a mixture of sand and water can be separated by 1)The proportions of components can vary. 2)Each component gains new properties

4.6. Separating enantiomers Organic Chemistry 1: An open ..

Characteristics of mixtures. Mixtures can be characterized by being separable by mechanical means e.g. heat, filtration, gravitational sorting, centrifugation etc. Mixtures can be either homogeneous or heterogeneous': a mixture in which constituents are distributed uniformly is called homogeneous, such as salt in water, otherwise it is called heterogeneous, such as sand in water Mixtures can be physically separated by using methods that use differences in physical properties to separate the components of the mixture, such as evaporation, distillation, filtration and chromatography. Which separation method used when attempting to separate a mixture depends on what kind of mixture it is (what states of matter are present. Separation of enantiomers Resolution of racemates The resolution of racemates is the separation of an equimolar mixture of enantiomers by physical or chemical methods.Usually, the separation is carried out after a preceding conversion of the enantiomers into diastereomers, because, as a result of their practically identical chemical and physical properties, entantiomers cannot be separated.

3. Circle which of the following mixtures can be Chegg.co

Mixtures A combination of two or more pure substances that are not chemically combined. substances held together by physical forces, not chemical No chemical change takes place Each item retains its properties in the mixture They can be separated physically Chem4kids.co Chromatography is a process for separating components of a mixture. To get the process started, the mixture is dissolved in a substance called the mobile phase, which carries it through a second substance called the stationary phase.. The different components of the mixture travel through the stationary phase at different speeds, causing them to separate from one another Question: A mixture of p-nitrophenol and o-nitrophenol can be separated by steam distillation. The o-nitrophenol is steam volatile, and the para iosmer is not volatile. Explain. Base your answer on the ability of the isomers to form hydrogen bonds internally. My answer: Phenols are compounds with an OH group attached to an aromatic carbon A mixture can be solid , liquid or gas. Soil is a solid mixture , milk is a liquid mixture whereas air is a gaseous mixture. The mixtures are separated into their components for various purposes such as : (1) To remove an undesirable component. We make a cup of tea by boiling tea leaves in water and then adding sugar and milk Answer: The given mixture can be separated using the following process. Magnetic Separation: Using magnetic separation the iron fillings can be separated from the given mixture. In this a magnet is hover just above the mixture, since iron is a magnetic substance it is attracted by magnet and stuck with it. By this first of all iron fillings are.

Video: Purpose of Separation of Substances: Reasons, Examples and

Mixtures - Particles and mixtures - GCSE Chemistry (Single

Types of Distillation - Distillation is a unit process widely used operation in chemical industries all over the world to separate components of a mixture. Distillation is a process of liquid evaporation and converted into vapor and recondense and collected in a vessel. In the manufacturing process, distillation is a commonly used unit operation as a part of the solvent recovery process (SR. They can only be separated by chemical methods. The substances that mixtures are made up of, are mixed physically and can be separated easily by physical methods like filtration, distillation, etc. Compounds are pure substances. Mixtures are impure substances. They are said to have fixed properties. They do not have fixed properties Q: If you buy a can of paint at a paint store, a store employee may put the can on a shaker machine to mix up the paint in the can. What type of mixture is the paint? A: The paint is a suspension. Some of the components of the paint settle out of the mixture when it sits undisturbed for a long time. This explains why you need to shake (or stir) the paint before you use it

Characterization and Application of a New Optical Probe

Solved: Circle Which Of The Following Mixtures Can Be Sepa

Air is a homogeneous mixture of different gases which can be separated by suitable methods. Therefore, it is a mixture and not a compound. Question 47. Observe the apparatus shown and answer the following questions. Identify the apparatus; Design an activity to use this apparatus to separate the mixture of mustard oil and water To separate the constituents of the mixture we can use the following steps: The first step is to pass the mixture through a filter paper. This will separate out a mixture of sand and iron filings from the salt solution. Now, pass a magnet over the mixture of sand and iron filings. The iron filings will be attracted to the magnet Mixtures are different from compounds because mixtures can be separated without using chemical reactions. If we think of particles, we can see the difference between mixtures and compounds in diagrams below. Each shape in the diagram is an atom. An element has only one type of atom. A compound is made of different atoms joined by a chemical bond An azeotrope is a mixture of two or more liquids that cannot be separated by the process mentioned above. It is also known as a constant boiling mixture. When it is boiled, the resultant gaseous form or vapor has the same composition, or ratio of components as the liquid state, which is why separation isn't possible the normal separation method Raoult's law plot for a mixture of hexane and heptane. Xhexane = 1 - Xheptane. Ptotal is the sum of the Raoult's law plots for the two pure compounds, indicating that this solution behaves ideally. An ideal solution is one whose vapor pressure follows Raoult's law throughout its range of compositions

Paper Chromatography Introduction The purpose of this experiment is to observe how chromatography can be used to separate mixtures of chemical substances. Chromatography serves mainly as a tool for the examination and separation of mixtures of chemical substances. Chromatography is using a flow of solvent or gas to cause the components Continue reading Paper Chromatography Repor A mixture is formed when two or more substances are physically mixed together. A compound is formed when two or more substances are chemically combined through a chemical reaction. The components of a mixture can be separated with relative ease, whereas the components of a compound are almost impossible to separate without a chemical reaction Or you can access here as well. Investigation #2 Separating Mixtures In this investigation students mixed three different substances, Diatomaceous Earth (the remains of millions year old, sea-dwelling microorganisms that have decomposed into a predominantly silica-based substance), gravel, and kosher salt into three separate cups containing 50 ml of water each (a) A mixture of the two dipeptides J and K is analysed by gas chromatography followed by mass spectrometry (GC-MS). Explain why J and K can be separated by gas chromatography and why mass spectrometry using electrospray ionisation does not enable you to identify them. Gas chromatography explanation ____ Draw particle representations for the following: A mixture of iron (Fe) and sulfur (S) A compound of iron (Fe) and sulfur (S) Explain why a magnet can separate iron atoms from the mixture but not from the compound. Consider the four containers below. Which of these are mixtures? _____

How would you separate the components of a mixture and

Components in a mixture can be separated by physical methods only. Centrifugation can be used for separating a heavier insoluble solid, present in an - insoluble solid-liquid mixture. The filter paper made into a cone & placed in a funnel for filtering out the solid particles in a solid-liquid mixture should be moistened before placing You are going to read an article about mixtures and solutions. This article will help you be able to describe various mixtures and solutions and ways you can separate them. You will also learn about elements and the periodic table. After you read the article, please answer the following questions using complete sentences. 1

Separating solids from liquids - filtration - Separating

Mixtures 1-3 Separating a Dry Mixture 1. Taking Mixtures Apart pg 11 • How would you separate a mixture of marbles, corks, and nails? • Would a screen be useful for separating a mixture of gravel and diatomaceous-earth powder? Explain. • Would filter paper be useful for separating a sugar and water solution? Explain Mixture is a combination of two or more substances that are not chemically united and do not exist in fixed proportions to each other. Sugar solution is a mixture because it can be separated into sugar and water by the method of evaporation. They show the properties of their constituent components ie., sugar and water because they taste sweet.

Mixture can be separated into its constituents by physical process. Compounds can be separated into its constituents by chemical process. Solid Sol: Alloys, gems, coloured glass: 2. Mixture shows the properties of its constituents. The properties of a compound are entirely different from its constituent elements . Sol: Paints, inks, eggs white: 3 Explain why , air is considered a mixture and not a compound. ← Prev Question Next Question Air is a homogeneous mixture of different gases which can be separated by suitable methods. Therefore, it is a mixture and not a compound. ← Prev Question Next Question →. The solvents can be chosen depending on the distribution coefficient of the chemical components that are going to be separated. Figure 2: Apparatus for Extraction First, the aqueous liquid mixture that is going to be separated is added Different Methods Used to Separate a Mixture of Oil and Water. Now that we know why these two compounds do not mix, let us now discuss some of the methods that are used to separate oil and water. Freezing. One of the easiest ways to separate oil and water is by freezing. As we all know, water becomes ice when it is subjected to low temperatures

Describe how water could be used to separate a mixture of pentane and ethanol. Answers. Add water to the mixture in a separating funnel. Ethanol dissolves in water while does not. Allow the mixture to separate in two layers. Explain why the metals magnesium and aluminium are good conductors of electricity b) Other than cost, give two. Tabitha Patrick/E+/Getty Images. Milk is not a pure substance; it is considered a mixture because it does not occur naturally on its own. It is a mixture that combines mostly water, sugar, fat and proteins. Most substances found in the world are not pure substances but are a combination of various chemicals and compounds Decantation can also separate solid and liquid mixtures by allowing gravity to pull the solid fragments to settle at the bottom of the container. In laboratory situations, decantation of mixtures containing solids and liquids occur in test tubes.To enhance productivity, test tubes should be placed at a 45° angle to allow sediments to settle at the bottom of the apparatus Air is a mixture, but not a compound because air can be separated into different components such oxygen, nitrogen etc through the process of fractional distillation. Also, air shows all the properties of gases present in it Mixtures are made up by combining pure substances. The pure substances do not lose their identity in the mixtures. There are can be a large number of mixtures formed by mixing the pure substances

Some mechanical mixtures can be separated by hand. Others are made of parts too small to separate by hand. There are different ways that you can separate mechanical mixtures: • sorting • floating • settling • using a magnet • using sieves and filters • dissolving 1. Sorting The simplest way to separate mechanical mixtures is by sorting Mixtures Matter that consists of two or more substances that are not chemically combined is called a mixture. Mixtures are classified according to how well they are mixed. Heterogeneous mixtures are the least mixed. The particles of this mixture are large enough to be seen and to separate 4. Draw particle representations for the following: A mixture of iron (Fe) and sulfur (S) A compound of iron (Fe) and sulfur. (S) 5. Explain why a magnet can separate iron atoms from the mixture but not from the compound. Page 1 of 3 (a) A mixture of milk and water can be separated by filtration. (b) A mixture of water and oil can be separated by distillation. (c) Filtration will separate wheat from husk (d) Camphor and sand are mixed together. By heating, camphor will sublime and the vapours can be collected. This will leave behind sand