a substance (Moore‚ Stanitski & Jurs‚ 2009). Freezing point is the fixed temperature at which a pure liquid converted into crystalline solid. Melting point is the fixed temperature at which a crystalline solid converted to a liquid (Ebbing & Gammon‚ 2010). The melting point of a solid and the freezing point of its liquid is the same. It is the temperature at which the rate of freezing of its liquid is the same as the rate of melting of a solid under a given applied pressure (Whitten‚ Davis & Peck
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chemists not only to identify the compound‚ but also to establish its purity. To determine the melting point two temperatures were noted. The first was the point at which the first drop of liquid formed among the crystals; the second was the point at which the whole mass of crystals turned to a clear liquid. And the melting point was recorded from this range of melting (Pavia‚ 2005). The melting point indicates purity in two ways; the purer the material‚ the higher its melting point. And‚ the
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PROPERTIES OF SOLUTIONS A solution is a mixture of materials‚ one of which is usually a fluid. A fluid is a material that flows‚ such as a liquid or a gas. The fluid of a solution is usually the solvent. The material other than the solvent is the solute. We say that we dissolve the solute into the solvent. Some solutions are so common to us that we give them a unique name. A solution of water and sugar is called syrup. A solution of sodium chloride (common table salt) in water is called brine
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(¡ÆC) Observation Unmelted White salt First liquid appear point 122 Grainy and shiny white Becoming all liquid 125 Clear B. Melting point of unknown #42 1st trial Temperature (¡ÆC) Observation Unmelted Shiny light yellow crystal First liquid appear point 99 Grainy yellow Becoming all liquid 101 Clear 2nd trial Temperature (¡ÆC) Observation Unmelted Shiny light yellow crystal First liquid appear point 95 Grainy yellow Becoming all liquid 97 Clear C. Melting point of mixture (Unknown
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INTRODUCTION A mixture can simply be defined as a substance that is made up or consists of two or more elements and/or compounds that are physically combined but that have not reacted chemically to form new substances. A mixture may be a solid‚ liquid‚ gas‚ or some combination of those states. Mixtures can be found almost every wher in our everyday lifes and some common examples are * sand and water * salt and water * sugar and salt * Due to the fact that mixture are not chemically
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fully precipitated 4. To learn the principals of powder material synthesizing through room temperature solid phase method & liquid phase method directional growing crystal form of precipitation Experiment Principals 1.the process of precipitation forming constitutive crystal ion accumulating growing forming nuclei sediment particals amorphous precipitation crystal nuclei 2. the classification of precipitations amorphous precipitation‚ particle diameter smaller than
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Filtration is commonly the mechanical or physical operation which is used for the separation of solids from fluids (liquids or gases) by interposing a medium through which only the fluid can pass. Oversize solids in the fluid are retained‚ but the separation is not complete; solids will be contaminated with some fluid and filtrate will contain fine particles (depending on the pore size and filter thickness). Filtration is also used to describe some biological processes‚ especially in water treatment and sewage
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Title: Liquids and Solids Purpose: The experiment will help determine two important physical properties‚ boiling and melting point‚ of liquids and solids. Procedure: Before starting the experiment I gathered all materials appropriate for the experiment and prepare a safe environment for my experiment. I record the boiling point of the Isopropyl Alcohol and the melting point of powdered Acetamide with lab equipment such as the thermometer‚ capillary tube‚ beaker‚ test tube‚ and burner fuel
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possessed many advantages and disadvantage‚ both from the process itself and from the final part produced. Observing the process step by step it was noted that the tasks carried out by the operator were not very difficult (i.e compacting sand‚ pouring liquid metal) and so giving the advantage of only requiring a low skill level. However‚ although the process did not involve a large amount of skill it was observed to be very labour intensive and took a long time to complete one cycle of the process (around
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This is defined as a substance dispersed evenly throughout another substance. A colloid consists of two phases in its entire substantial form which are a dispersed phase of the solution and a continuous phase. A colloidal system may be solid‚ liquid or gaseous in form. Some colloids are translucent which causes particles to be scattered throughout the colloid‚ whilst other colloids may be opaque or have a slight color. PROPERTIES (Particle Visibility‚ Particle Distribution‚ Filterability
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