experiment‚ the online simulation was used to determine which substances were endothermic or exothermic when dissolved in water. According to the simulation‚ sodium chloride and ammonium chloride was observed to be endothermic. Calcium chloride‚ sodium acetate‚ sodium carbonate‚ and lithium chloride was observed to be exothermic. As sodium chloride and ammonium chloride was observed to be endothermic‚ those two salt substrates was not used in the experiment as the goal of the experiment was to increase
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Manganese (IV) oxide catalyses the decomposition of aqueous hydrogen peroxides. In an experiment 50.0 cm3 of aqueous hydrogen peroxide was mixed with 0.50 g of manganese (IV) oxide. The total volume of oxygen formed was measured every 10 seconds. The results of the experiment are shown in the graph. (i) After how many seconds did the decomposition of hydrogen peroxide finish? (ii) How many moles of oxygen were produced at the end of the decomposition? [At room temperature and pressure
Free Oxygen Oxide Nitrogen
Bellamar Caves are a National Monument that is located in Matanzas‚ Cuba‚ they are a set of cave with more than 23 kilometers of galleries. By the beauty of its gallery and caves‚ they were declared a National Monument. The galleries and passages of the cave started forming about 300 thousand years ago. According to the studies the caves were originally under the sea‚ part of the bat of Matanzas. While they were under sea level‚ these caves were full of water. The tectonic movements caused the area
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April-May ranges from 36~42°C arid mean minimum temperature during winter ranges from 15-24° centigrade. Semi-arid to sub-humid‚ tropical to sub-tropical monsoon type climate with alternate dry and wet periods and calcification (formation of calcium carbonate) are favourable to the formation of black soils. The soils are characterised by dark grey to black colour with 35-60% clay‚ neutral to slightly alkaline reaction‚ high swelling and shrinkage‚ plasticity‚ deep cracks during summer and poor status
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® Copying is permitted according to the Site Licence Conditions only keep it simple science Preliminary Chemistry Topic 2 METALS What is this topic about? To keep it as simple as possible‚ (K.I.S.S.) this topic involves the study of: 1. OUR USE of METALS 2. CHEMICAL ACTIVITY of the METALS 3. PATTERNS of the PERIODIC TABLE 4. QUANTITY CALCULATIONS... the MOLE 5. METALS from their ORES ...all in the context of how Chemistry contributes to cultural development but first‚ an introduction
Free Periodic table Chemical element Atom
d 1. What is the correct formula for the carbonate ion? (a) CH3COO(b) Cl(c) CO22(d) CO32(e) (COO-)2 c 2. What is the name of Fe(OH)3? (a) (b) (c) iron hydroxide iron trihydroxide iron (III) 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
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water and then with the alkali. Rinse with tap water and then with distilled water. Rinse with tap water and then with the acid. Rinse with the alkali. The labels fell off two bottles each containing a colourless solution‚ one of which was sodium carbonate solution and the other was sodium chloride solution. The addition of which solution to a sample from each bottle would most readily enable the bottles to be correctly relabelled? A B C D ammonia hydrochloric acid lead(II) nitrate sodium hydroxide
Free Oxygen Oxide Chlorine
bills will be high because your water pipe has a leak. These are just some of the problems we encounter in our houses‚Primary cure to this problems are sealants.Oyster isn’t just any seafood its shells has avery useful usage.Oyster shells has a calcium carbonate and silicate;the shells also contains many other ingredients including Aspartic acid‚Glycine‚Serine and a whole lot more.Sealants can also be made out of oyster shells‚sealants are viscous material that has little or no flow charecteristics and
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:ABSTRACT The researcher conduct this study due to economics crisis nowadays. It’s aim to create a product of chalkwhich is cheaper and could give the same quality which the commercial one could give through eggshells. This steps was made by the researcher to make a chalk out of eggshells;First she clean the empty eggshell of the chicken through washing‚then when the eggshells is already dry‚ she pound the clean eggshells very well until it will become a powder‚then she get the residue and she separate
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Describe how the presence of substances in the table above: copper(II) sulfate‚ iron(II) sulfate and cobalt(II) chloride) change rate of the reaction. Unit 2 learning Aim C – How fast is your reaction? – Part 4 Chemical equation calcium carbonate + hydrochloric acid calcium chloride + carbon dioxide + water CaCO3(s)
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