Mixed Melting Points | Determination of an Unknown Solid | | [Type the author name] | 9/15/2011 | Purpose : The main purpose of this experiment was to identify an unknown compound/substance by performing multiple experimental melting point tests. Pure and impure solids were tested to see what affect pureness/impureness had on a melting point. Background: The melting point of a solid can be used to determine the purity of the solid. Pure samples usually have identical or similar melting
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Sngapore’s seperation from Malaysia was caused by UMNO’s policies. The spotlight of this statement is the correspondance of the seperation of Singapore from Malaysia‚ due to the policies carried out by the United Malay National Organisation. During this post-war period‚ although Singapore was already a part of Malaysia‚ their relationship was uncertain due to the political tension and differences in ideology between Singapore and the Malayan states at that time. It has been reviewed that Source
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matter is neither created or destroyed and it is only rearranged 2. In chemical reactions‚ the molecules stay the same‚ they are just rearranged to form a different substance Mixtures and Substances 1. A pure substance is a substance that consists of only one component and has a definite composition 2. A mixture is two substances that are mixed but not combined chemically 3. A pure substance has only one
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of atom are called mixtures. * Mixtures are made up of groups of atoms called molecules. * Molecules that are made of one type of atom are called simple molecules. Examples: O3 ‚ N2 ‚ S8 * Molecules that are made of more than one type of atom are called compound molecules.
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Purpose: The purpose of the gas chromatography lab is to find out how different substances interact with the surface of a solid. Chromatography is a separation technique that depends on the relative distribution of the components of a mixture between a mobile phase and a solid stationary phase. Chromatography measures the tendency of a substance to interact with the surface of a solid or to remain in a mobile phase. When doing a chromatography lab the mobile phase has to be a substance that is either
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It exists in solids‚ liquids‚ gases‚ and plasmas. You can determine whether an object is a solid or not based on two characteristics. Solids have a definite shape and a definite volume. Solid’s particles are so close together that they cant move and that’s what keeps a solid a definite shape. Little motion can occur in the particle arrangement. Particles in liquids‚ however‚ can move more freely. The particles are close together but are not as tightly packed as solids are. Like solids‚ liquids have
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Alexie not only shines a new light on indian life‚ but reflects upon the similarities and differences that exist between cultures. The film makes use of human emotion‚ situations and relationships to create a dramatic and truthful dynamic of the solid and figurative connections between Native America and White America. Besides these important factors‚ Alexie also touches upon the importance of family and culture. This film is not an ordinary Native American film that many are used to viewing
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substances naphthalene‚ biphenyl and a mixture of C. Data/Observation Sample | Melting Point Range (°C) | | Accurate trialStart Done | Naphthalene | 81 | 85 | Biphenyl | 71 | 73 | Mixture C | 42 | 56 | Questions: 1. The effect of the impurity on the mixture caused the melting point of the mixture to be lowered. 2. The reason why the melting point of a binary mixture is lowered‚ is due to the fact that the mixture of the two components has caused
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2. Put half in a microwave until liquefied 3. How pour mixture mixture or left it flow down the plastic plate down to the finishing place while you time them 4. Do the same to the solid candies 5. record time 6. repeat 2 more times 7. When you are done‚ you might as well eat the candies!! Procedures 1. Put your 4 types of candies into a bowl or a plate 2. Put half in a microwave until liquefied 3. How pour mixture mixture or left it flow down the plastic plate down to the finishing
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1. Solution is a homogeneous mixture composed of only one phase. In such a mixture‚ a solute is a substance dissolved in another substance‚ known as a solvent. Suspension is a heterogeneous mixture in which the particles are large enough to be seen by a microscope or the unaided eye and eventually‚ they settle out of the mixture. A colloid is a substance microscopically dispersed throughout another substance. Unlike colloids‚ suspensions will eventually settle. The suspended particles are visible
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