point of both pure substances and five mixtures of different ratios. The purpose of the second section was to identify an unknown sample by measuring its melting point and mixing it with two known substances and comparing them. The results suggest that the eutectic point is closest to the weight % ratio of 10/90 naphthalene to biphenyl and the unknown sample is acetamide. Introduction: One way to establish the purity of a substance is to measure its melting point. A pure substance will have a sharp
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opportunity to investigate the physical and chemical properties of pure chemical substances and analyze the experiment results. Procedure: In the beginning of the experiment‚ I filled two 24-well plates half way with the given chemicals and sucked up these chemicals into their labeled pipets for later use. Following this‚ I performed a number of steps on each of the four test tubes and recorded observations of the different substances including odor‚ color‚ reaction to heat‚ the effects on the red and blue
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Substance abuse amongst women who are of the childbearing ages has risen in the United States‚ in fact substance abuse is much higher in this age group than with any other age group. While this is a problem within itself already‚ the problem worsens when a woman who was already abusing drugs gets pregnant. It should be assumed that taking drugs during a pregnancy is extremely dangerous‚ not only to the fetus but also to the mother. Pregnancy is proven to be harsh on the mother’s body‚ but when illicit
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Chemistry •Matter • • • States Properties Classification Chemistry is the study of the composition‚ properties and structure of matter. it is considered “the central science”; blending at one extreme into physics‚ mathematics‚ engineering and sometimes into earth and life Chemistry Is the study of the matter‚ its classification‚ composition‚ properties and structure; the changes it undergoes‚ the energy transformation that goes with the change‚ and the laws and principles governing such changes
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Educational and Counselling Psychology and Special Education‚ University of British Columbia‚ Vancouver‚ Canada School of Population and Public Health‚ University of British Columbia‚ Vancouver‚ Canada Abstract: Introduction: Alcohol (AUD) and other substance use disorders (SUD) are common among adolescents. The CRAFFT (Car‚ Relax‚ Alone‚ Forget‚ Friends‚ Trouble‚ 1999) was developed as a brief screening instrument for adolescents to measure AUD and SUD. This systematic review examines the psychometric
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molecular level when a substance melts; to understand the primary purpose of melting point data; to demonstrate the technique for obtaining the melting point of an organic substance; and to explain the effect of impurities on the melting point of a substance. Through the experimentation of three substances‚ tetracosane‚ 1-tetradecanol and a mixture of the two‚ observations can be made in reference to melting point concerning polarity‚ molecular weight and purity of the substance. When comparing the
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A reaction is a chemical process in which substances decomposes‚ or combines with other substances. In this case it is synthesis chemical process which creates new products. However‚ the rate of a reaction can be altered either faster or slower depending on certain variables. These variables are concentration‚ temperature‚ surface area‚ and catalysts. A reaction can be made faster or slower with a variation in the concentration of reactants; a reaction goes faster when there is an increase in concentration
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chloride and calcium carbonate then calculate the percentage by mass of each component recovered from the mixture. The other purpose of this experiment was to show us the students the concepts associated with physical and chemical properties of substances. Me and my lab partner‚ obtained a mixture of a un known proportion from the instructor and then flow the guide line in our lab manual to separate the mixture by applying the separation method motioned in our lab manual pages 33-40 . In this
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mixtures were collected and tested by different individuals in the lab in order to find the eutectic point of biphenyl. Unknown substances were then tested using the mixture melting point method in order to determine their identities. INTRODUCTION The melting point of a solid is the temperature where the substance changes from a solid to a liquid state. Using known substances and determining their melting points is a way to establish the purity of and to identify a sample. This lab demonstrates the
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6-4-2013 A pure substance or chemical substance is a material that is homogeneous. It has consistent properties throughout the sample.” Pure substances can be described by both physical and chemical properties”. Physical properties can include‚ color‚ odor‚ melting point‚ boiling point‚ and solubility in various solvents‚ etc. The observation of these physical properties does not involve any chemical change in the substance‚ it is still the same. Meaning it is still the same pure substance it was before
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