polychlorinated biphenyl‚ pyridine‚ 2‚4‚5-T‚ and parathion. PCB The first chemical to be effected by the fire is the PCB (polychlorinated biphenyl). This chemical is used as an electro conductor in the transformer and cools the transformer. PCB contains hydrogen‚ carbon and chlorine. This chemical can cause skin irritation and redness of skin in its original form if skin contact does occur. The LD50 for PCB is 8500 – 11‚900 ppm. Exposure to PCB can cause defatting and chlorance. Both of these are from
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graduated cylinder X Water ¡V deionizer (distilled water) X 0.1M cobalt (II) chloride hexahydrate X 95% ethanol X 0.1M cobalt (II) chloride hexahydrate dissolved in 95% ethanol X zinc X 1M hydrochloric acid solution X 0.1M copper (II) sulfate solution X 0.5M sodium hydrogen carbonate solution X 1M ammonia solution X magnesium X 1M sodium hydroxide solution X ammonium chloride Procedure: A. Be sure to always start with clean‚ dry test tubes‚ equipment
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Physiological Adaptation of Fish to Its Environment BIO101 March 11‚2013 Physiological Adaptation of Fish to Its Environment All organisms around the world are sparsely distributed depending on the environment that best suited to their modes of survival. Organisms undergo adaptation – an evolutionary process where they became well-suited to a particular
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concentrations of chlorine dioxide in the air or in water. The measurement of chlorine dioxide in biological materials is not commonly used because of the rapid conversion of chlorine dioxide to chlorine-containing metabolites‚ such as chlorite and chloride ions. Abdel-Rahman et al. (1980b) developed a method to quantitatively and qualitatively measure the metabolites of chlorine dioxide (e.g.‚ ClO2-‚ and ClO-) in biological fluids. These biomarkers can be used to indirectly measure chlorine dioxide
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Edexcel A2 Chemistry Questions and Answers Contents Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Unit 4 Rates‚ equilibria and further organic chemistry Multiple-choice questions ..............................................................................7 Structured questions . . . . . . . . . . . .
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27) Na2O 28) CaF2 29) BP 30) Al2O3 1) magnesium sulfide 2) potassium bromide 3) barium nitride 4) aluminum oxide 5) sodium iodide 6) strontium fluoride 7) lithium sulfide 8) radium chloride 9) calcium oxide 10) aluminum phosphide 11) potassium sulfide 12) lithium bromide 13) strontium phosphide 14) barium chloride 15) sodium bromide 16) magnesium fluoride 17) sodium oxide 18) strontium sulfide 19) boron nitride 20) aluminum nitride 21) cesium oxide 22) rubidium iodide 23) magnesium oxide 24)
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neutralized base for example hydrochloric acid and sodium hydroxide form sodium chloride and water. Neutralization with a base weaker than the acid results in a weakly acidic salt. An example is the weakly acidic ammonium chloride‚ which is produced from the strong acid hydrogen chloride and the weak base ammonia. Conversely neutralizing a weak acid with a strong base gives a weakly basic salt sodium fluoride from hydrogen fluoride and sodium hydroxide. Acids are often used to remove rust and other
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The reason that Sodium gives electrons when reacting with a substance such as Chloride instead of sharing electron in a reaction such as the Hydrogen and Oxygen forming water molecules can be found in the type of bond in each example reaction. Before I can identify the contrasting characteristics of each reaction‚ I must first acknowledge the reason atoms react with one another in the first place. Each element has a certain number of valence electrons‚ an example being Sodium having one valence electron
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The Earth’s atmosphere has changed over billions of years‚ but for the past 200 million years it has been much as it is today. We are‚ however‚ causing our atmosphere to change by human activity. Burning fossil fuels and deforestation are two examples of human effect on the environment. Composition of the Earth’s atmosphere The composition of air You need to know the proportions of the main gases in the atmosphere. The Earth’s atmosphere has remained much the same for the past 200 million years
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types of reactions: 1. addition of oxygen 2. removal of hydrogen 3. increase in valency (how easily an atom can combine with other chemical species) Reduction → the gain of electrons → always happens at cathode (negative electrode) → think catHode (H2 produced in the electrolysis of water xp) An oxidising agent is a substance that allows oxidation (the loss of electrons) to occur by being reduced (by taking in those electrons) e.g. hydrogen peroxide (hair bleaching)‚ oxygen (respiration) Real Life
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