1 a The diagram shows the parts of a hydrogen atom. [pic] Use words from the list to label the diagram. electron group nucleus symbol (2) b Hydrogen can be used as a clean fuel for cars. i When hydrogen burns in air‚ it reacts with another element. Complete the word equation for this reaction. hydrogen + ................... → water (1) ii Suggest one reason why hydrogen is called a clean fuel. (1)
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one nitrogen double bond‚ a hydroxyl group‚ and no ions. Blue No.1 contains nitrogen and chlorine ions and N(C2H5)CH2. 2. In the Introductory Activity‚ the developing solvents were 2% sodium chloride aqueous solution and 2% isopropyl alcohol aqueous solution. Draw separate molecular diagrams of how sodium chloride and isopropyl alcohol would interact in water. Identify the types of intermolecular attractions within each
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properties. With two hydrogen atoms sticking to an oxygen atom in a tetrahedron shape‚ water is considered as a polar molecule. Because oxygen is very electronegative‚ it pulls hydrogen’s electrons towards it‚ causing oxygen to become partial negative. The hydrogen atoms then will have fewer electrons towards its own nucleus‚ therefore making it partial positive. Since positive charge and negative charge attracts each other‚ the molecular formation of H2O will result hydrogen bonding. Each water
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chemical change. The second reaction occurred as a result of solid magnesium reacting with hydrochloric acid. The reaction produced heat and bubbles‚ both indications of a chemical change. A wood splint was used to determine that the gas produced was hydrogen gas‚ hence the other product is magnesium dichloride. In the third reaction‚ ammonium carbonate was heated to decompose into two gases‚ due to the absence of anything solid or liquid following the reaction. A wood splint was used to determine that
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OxidatiOn and ReductiOn OxidatiOn & ReductiOn 9.2 9 Introduction to oxidation and reduction Redox equations Some common oxidising agents and reducing agents (EXT) 9.3 Reactivity 9.4 Voltaic cells 19.1 Standard electrode potentials (AHL) 9.5 Electrolytic cells 19.2 cORe 9.1 Electrolysis (AHL) TOK Are oxidation numbers real? I remember contemplating on the nature of reality back in Chapters 2 and 4‚ with regard to electrons and hybridization respectively
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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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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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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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An example would be the reaction between silicon and hydrogen‚ where each silicon has an electron octet and each hydrogen has an electron duet. With that ratio being four hydrogen atoms bonding to each silicon atom‚ the empirical formula can be computed to be SiH4. In this experiment‚ I will write chemical equations using Lewis symbols and Lewis structures to represent
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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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