eutectic point. Melting point of a solid is the temperature at which the solid and its liquid form are in equilibrium‚ i.e.‚ molecules move back and forth between the two states at the same rate‚ so both phases remain present. If the temperature of a solid is measured carefully as the solid is heated‚ the temperature will be observed to rise until the melting point (m.p.) of the solid is reached‚ and then the temperature will remain almost constant while the solid melts. The heat absorbed during melting
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started immediately with concomitant formation of a brown precipitate of crude acetanilide. 50ml of water and a magnetic stirring bar were added to stir the reaction mixture and the flask was heated on a magnetic stirring hot plate until all of the solid and oil were dissolved. The temperature of the reaction mixture at this point was close to 100°C‚ the boiling point of water. A few milliliters of hot solution was removed from the flask with a disposable pipette and placed in a test tube. The test
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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‚ 2009). A change of state involves the removal
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added and the mixture was heated to a boil on a hot plate. 0.5mL of water was added to the flask‚ while swirling the flask. The mixture was boiled until the benzoic acid completely dissolved. The total volume of water used was recorded. The black solid that remain in the dissolved mixture was the impurity. 2. A filter was prepared by placing a fluted filter paper in a 3 inch funnel. The funnel was placed onto a 100mL beaker with 5mL of water at the bottom. The filter paper was moistened. The
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| Salman Ishaq 12-E | 1/27/2013 | | BACKGROUND As energy flows from a liquid‚ its temperature drops. The entropy‚ or random ordering of its particles‚ also decreases until a specific ordering of the particles results in a phase change to a solid. If energy is being released or absorbed by a substance remaining at the same temperature‚ this is evidence that a dramatic change in entropy‚ such as a phase change‚ is occurring. Because all of the particles of a pure substance are identical‚ they
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C) After burning the material is not paper anymore. The products of combustion were water‚ carbon dioxide and ashes. 2. i. Platinum a) It’s a solid‚ malleable‚ thin‚ hard b) Platinum wire turns red when heated‚ remains hard and malleable c) The properties remained the same d) There was no permanent
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dsfgsfdhdhfg 9. What does a strong odour indicate about the ease with which the particles in a solid leave its surface? A strong odour in one of any of these soilds would simply mean that the molecules leave the surface easily. 10. From your answer to question 1‚ which of the two types of solids seem to have the stronger forces of attraction? Explain your answer. Camphor has a very strong odor which makes it easy for the particles in the soild leave it’s surface. The particle attraction
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States of Matter Table of Contents Kinetic Molecular Theory Page 3 Diagram of Kinetic Molecular Theory Page 4 Solids Title Page Page 5 Diagram of Particles Page 6 Characteristics of a Solid Page 7 Pictures of Solids Page 8 Q & A Page 9 Liquids Title Page Page 10 Diagram of Particles Page 11 Characteristics of a Liquid Page 12 Pictures of Liquids Page 13 Q & A Page 14 Gases Title Page Page 15 Diagram of Particles Page 16 Characteristics of a Gas Page 17 Pictures
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INTRODUCTION. SOLIDS‚ LIQUIDS AND GASES have properties that are use to describe how they behave‚ e.g. for solids it has a definite shape‚ you can hold a solid rock in your hand. You can push on a solid brick wall. Scientists say a solid is something that has shape. A solid resists any change in its shape. TASKS 2. LOOK AT THE PICTURES BELOW FOR SOLID‚ LIQUID AND GAS AND WRITE DOWN THREE PROPERTIES OF EACH? Wood as a Solid. Solid has a fixed shape Its particles are tightly held together
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precipitation of the protein and is non-denaturing to the protein structure. Important Points to Consider For Ammonium Sulfate Precipitation. • Addition of solid – Add the solid slowly. Simply dumping in the salt at one time will cause the initial concentration to be much higher as the solid dissolves‚ resulting in the wrong protein to be precipitated. Add the solid ¼ at a time while stirring on a stir plate. Conducting this in the cold room. Avoid frothing of your solution‚ this indicates denatured protein
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