able to dissolve some kinds of rocks‚ like feldspar and limestone‚ in a process called carbonation. Many caves begin forming during the process of carbonation. On the other hand‚ any mineral that reacts with oxygen in the atmosphere will produce an oxide. Therefore‚ when an object made of iron is left exposed to the atmosphere it will oxidize and rust will form on the surface. Oxidation produces a reddish-brownish colour. 2. Draw & label a diagram to show how plants and animals break down
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hydroxide (d) (e) iron (II) hydroxide none of these d 3. From the following ionic compounds‚ choose the name-formula pair that is not correctly matched. (a) (b) (c) (d) (e) sodium sulfide ammonium nitrate zinc hydroxide sodium sulfate calcium oxide Na2S NH4NO3 Zn(OH)2 Na2SO3 CaO b 4. How many atoms of hydrogen are in 1.00 mole of water? (a) (b) (c) 6.02 x 1023 atoms 1.20 x 1024 atoms 1.81 x 1024 atoms (d) ( e) 2.41 x 1024 atoms 3.01 x 1023 atoms a 5. How many atoms of carbon are present
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Writing ionic equations for redox reactions You can split the ionic equation into two parts‚ and look at it from the point of view of the magnesium and of the copper(II) ions separately. This shows clearly that the magnesium has lost two electrons‚ and the copper(II) ions have gained them. These two equations are described as "electron-half-equations" or "half-equations" or "ionic-half-equations" or "half-reactions" - lots of variations all meaning exactly the same thing! Any redox reaction
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In medical facilities it is necessary to equips materials and surfaces with a high level of hygiene using antimicrobial agents to protect them against bacteria and other micro organisms to prevent infections caused by bacteria and contribute significantly to reduce health costs. Benefits of nanoscale coatings in this sector include long lasting antimicrobial effect‚ constant release of the active substance‚ effectiveness against bacteria and other micro-organisms‚ no chemical impurities‚ easy processing
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CHLORINE DIOXIDE AND CHLORITE 105 7. ANALYTICAL METHODS The purpose of this chapter is to describe the analytical methods that are available for detecting‚ measuring‚ and/or monitoring chlorine dioxide and chlorite‚ its metabolites‚ and other biomarkers of exposure and effect to chlorine dioxide and chlorite. The intent is not to provide an exhaustive list of analytical methods. Rather‚ the intention is to identify well-established methods that are used as the standard methods of analysis
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Review of Related Literature Chalk is a type of limestone. Air and water do not wear chalk away easily‚ so when chalk is next to the sea‚ it often makes a largecliff. The "White Cliffs of Dover" in Kent‚ England are a good example of this. When chalk is near the top of the ground‚ it often makes chalk hills. Chalk holds water‚ so these chalk hills have a lot of water in them‚ and when the weather is very dry‚ water comes slowly from the chalk. Chalk is mostly formed from the calcareous (CaCO3)
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passed through a converter.The sulphur dioxide is oxidized to sulphur trioxide. 2SO (g) + O (g)→ 2SO (g) b) Optimum conditions used are as follows. (i) temperature: 450。C (ii) Pressure: 1 atmosphere (iii) Catalyst: Vanadium (V) oxide‚ V O c) About 97% conversion occurs under these optimum conditions. 6. Stage III: Production of sulphuric acid a) The sulphur trioxide is first dissolved in concentrated sulphuric acid to form a product called oleum‚ H S O b) Sulphur trioxide is
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the vehicles‚ we suggest installing a 3-way catalytic converter‚ which can oxidize carbon monoxide to carbon dioxide 2CO + O2 ---> 2CO2‚ unburnt hydrocarbons to carbon dioxide and water CxH2x+2 + (3x+1)/2 O2 ---> xCO2 + (x+1) H2O and reduce nitrogen oxides to nitrogen and oxygen 2NOx ---﹥N2 ＋ xO2. Nevertheless‚ the catalytic converter cannot be used on leaded petrol vehicles because Lead will poison the catalyst such as Platinum inside the converter. Indeed‚ there are more possible solutions to
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Beryllium is a hard and brittle alkaline earth metal‚ which is greyish in colour‚ and an excellent thermal and electrical conductor. The melting point of beryllium is 1278°C‚ the boiling point is 2970°C. There is a fine layer of beryllium oxide covering it’s surface so it will not react with water or steam. However‚ it will react with oxygen when heated to around 600°C. Beryllium originally named glucinium‚ which derives from the Greek word “glykys”‚ which means sweet. This is because beryllium
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The Effect of Air Pollution on Human Health Yinghua Cui English 151B - 11 Instructor Terry Taskey May 2‚ 2012 The Effect of Air Pollution on Human Health With the booming of science and technology‚ pollution has aroused wide public concern. Industrial civilization creates tremendous fortune. At the same time‚ automobile exhaust ‚ the burning of waste‚ and a multitude of waste gas is discharged into the atmosphere. Humans live depend on air. Therefore‚ it is undeniable that
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