meter at various soil water ratios and with or without calcium chloride. Method and Materials Samples of sedentary soil‚ 3:2 soil‚ sand‚ organic matter and compost‚ 100ml vials(x12)‚ bottle of distilled water‚ analytical balance‚ pH meter‚ 2 buffer solution of known pH‚ 0.25M calcium chloride solution. Results Table 1- Average pH measurement for the given soil/water ratio in both without 0.01M calcium chloride and with 0.01M calcium chloride for different soil types. Note: The groups
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Stoichiometry Practice Problems Be sure to balance all equations before you start calculating! Answer key is at the end. 1) Lithium hydroxide reacts with hydrobromic acid to produce lithium bromide and water. If you start with ten grams of lithium hydroxide‚ how many grams of lithium bromide will be produced? 2) Ethylene (C2H4 ) reacts with oxygen gas to produce carbon dioxide and water. If you start with 45 grams of ethylene‚ how many grams of carbon dioxide will be produced?
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chloride + Aluminium sulphate → Barium sulphate + Aluminium chloride (iii) Sodium + Water → Sodium hydroxide + Hydrogen Answer (i) (ii) (iii) Question 3: Write a balanced chemical equation with state symbols for the following reactions. (i) Solutions of barium chloride and sodium sulphate in water react to give insoluble barium sulphate and the solution of sodium chloride. (ii) Sodium hydroxide solution (in water) reacts with hydrochloric acid solution (in water) to produce sodium chloride solution
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Agents and Bonding Admixtures. It would damage the concrete or occur some reduction in compressive strength. Question 2 (a) -Different burning temperature -Different fineness of grinding -Add the cement powder with other materials‚ i.e. calcium chloride‚ flyash or silica fume‚ to produce special cements. (b) A reaction generates considerable amount of heat and cause the cement stiffen within a few minutes after mixing with water. * Can be overcome by adding water‚ but low overall
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ICSE X | CHEMISTRY Board Paper – 2015 ICSE Board Class X Chemistry Board Paper – 2015 Time: 2 hrs Max. Marks: 80 Answers to this Paper must be written on the paper provided separately. You will not be allowed 10 write during the first 15 minutes. This time is to be spent in reading the Question Paper. The time given at the head of this paper is the time allowed for writing the answers. Section I is compulsory. Attempt any four questions from section II. The intended marks for questions or parts
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sparingly soluble salt is used. The dissociation reaction is KHC4H4O6 (s) ⇌ K+ (aq) + HC4H4O6- (aq) and the solubility product constant‚ Ksp‚ expression can be written as Ksp = [K+][HC4H4O6-] As KHC4H4O6 dissociates‚ it gives the same amount of HC4H4O6- and K+ ions‚ so the Ksp expression may be rewritten as the square of [HC4H4O6-]‚ i.e. Ksp = [HC4H4O6-]2 The hydrogen tartrate ion‚ HC4H4O6-‚ acts as a weak monoprotic acid. The concentration of HC4H4O6- can be determined by titrating
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drinks right when you need it. Hot-Can is non-toxic and non-flammable‚ and 100% recyclable. 1.How does Hot-Can work? Hot-Can has developed a special double-chambered aluminium can which contains the beverage in the outer chamber and holds water and calcium oxide (quick lime) separately in the inner chamber. When the seal at the bottom of the can is depressed and broken‚ the water mixes with the quicklime‚ starting an exothermic reaction that heats the contents of the outer chamber by 50-55°C in just
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magnesium sulfide‚ MgS‚ is soluble + any other cation = low solubility (insoluble) zinc sulfide‚ ZnS‚ is insoluble hydroxide OH- + alkali ions (Li+‚ Na+‚ K+‚ Rb+‚ Cs+‚ Fr+)‚ Sr2+‚ Ba2+‚ Ra2+‚ Tl+‚ and H+(aq)‚ and NH4 = soluble strontium hydroxide‚ Sr(OH)2‚ is soluble + any other cation = low solubility (insoluble) silver hydroxide‚ AgOH‚ is insoluble (forms a precipitate) Phosphate (PO43-)‚ Carbonate (CO32-)‚ Sulfite (SO32-) + alkali ions (Li+‚ Na+‚ K+
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with chromate to form an equilibrium and produce some dichromate and water. This reaction will cause the amount of chromate to decrease in order to form more products and the equilibrium will shift to the right. c) The NaOH‚ specifically the hydroxide‚ would react with the dichromate and push the equilibrium toward reactants. This would increase the amount of reactants and decrease the amount of dichromate being formed in the equilibrium. The solution would be yellow because there would be more
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cleaners‚ metal cleaners and rust removers. A variety of maintenance chemicals contain these compounds. Alkali maintenance chemicals like degreasers‚ oven cleaners and drain openers contain bases such as Sodium Hydroxide (NaOH)‚ Potassium Hydroxide (KOH)‚ Sodium Metasilicate (Na2SiO3)‚ Ammonium Hydroxide (NH3(aq)). Special salts like Sodium Lauryl Sulfate‚ ammonium ethoxysulfate are formulated into carpet shampoos‚ hand soaps and carwash detergents to provide more efficient cleaning. What is a pH buffer
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