if a substance is pure‚ it will have a very specific melting point‚ within one or two degrees Celsius. This is in opposition to a mixed‚ or contaminated substance‚ which will have a broad melting range. Therefore‚ when we mix our unknown with samples of phenacetin and acetanilide‚ whichever mixture has a more accurate melting point will tell us what our unknown is. It is also important to make sure that the resulting melting points are close to what the proven melting points of the substances are
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BIODEGRADABLE SUBSTANCES Biodegradable matter is generally organic materials such as plant and animal matter and other substances originating from living organisms‚ or artificial materials that are similar enough to plant and animal matter to be put to use by microorganisms. Some microorganisms have a naturally occurring‚ microbial catabolic diversity to degrade‚ transform or accumulate a huge range of compounds including hydrocarbons (e.g. oil)‚ polychlorinated biphenyls (PCBs)‚ polyaromatic
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separates an overgrown dry grass paddock is a cyclone fence. If any of the drums falls over and chemicals leak out this can seep through the holes in the fence either cause the dry grass to combust or contaminate the land. If the land was found contaminated the construction of the future community centre would not go ahead. Each hazard that has been found at ABC
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pattern of endlessly repeating lattice of ions they do not exist as a free unit of atoms but in crystal lattices with repeating ions in specific ratios which is why empirical formula is used as a form of identification for defining an ionic-bonded substance. Calculating the empirical formula: To calculate the empirical formula for when two reactants undergoes a chemical reaction‚ the following 5 steps should be taken: 1. Record the masses of all the elements present in a given compound
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derivative of morphine in that the –OH (hydroxyl group) is replaced by an acetyl group‚ -OCOCH3 and has a molecular formula is C21H23NO5 with a molecular weight of 369.42 grams per mole and a melting point of 173°C. Heroin is a schedule I controlled substance meaning it has no medical uses and has a high potential for abuse. Abuse is classified as illegal usage of a drug or excessive use above recommended dosage. Some health effects include nervous system disturbances‚ narcosis‚ asthma and acute pulmonary
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sugar‚ aluminium Heterogeneous : Having non-uniform composition where there are recognisable small pieces of material Impure substances: are mixtures Contaminated with small amounts of one or more other substances Elements: Pure substances which cannot be decomposed into simpler substances Compounds: Pure substances which can be decomposed into simpler substances 2 or more elements E.g. Table salt (sodium chloride)‚ water and elements. Atoms: The particles that make up elements An atom
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presented with an unknown chemical substance‚ identification of that substance is revealed through a seires of tests that involve chemical and physical properties of that substance. Problem: You are given an unknown chemical substance that you need to be able to identify. How are you going to do this? The compound can be either harmful or toxic‚ so what you need to do is test all of its physical and chemical properties‚ and then find out the synthesis of the substance. Qualitative testing and quantitative
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In the left corner‚ behind the filing cabinet was where the drug dealer‚ Joseph‚ stored his illegal narcotics. He had done drugs himself to the point that his mind was a depravity to others. Joseph made a profuse amount of money. He had a myriad range of drugs that he sold. He sold drugs from the simple pain killing drug‚ Ibuprofen‚ to one of the most complicated drugs‚ Meth. Joseph provided these drugs to others from his home even though it was a ramshackle. He was very fervent about his job.
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how matter is classified? Answer: * Pure Subtance * Mixture Q2(NCERT): What is meant by a pure substance? Answer: A sample of matter containing only one substance is called a pure substance. In other words all constituents of the substance are same in their chemical nature. Q3: What are the characteristics exhibited by a pure substance? Answer: 1. A pure substance contains only one kind of atoms or molecules. 2. It is perfectly homogenous 3. It has definite composition
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Retonda Dawson HCA/250 May 2‚ 2014 Amy Foster DRUG ABUSE Drug abuse is one of the leading struggles that people
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