Unit 3 assessment O1 Analysis of fertiliser-an extended experimental investigation Background: In this investigation you will analyse the composition of a lawn fertiliser‚ or ‘lawn food’. You may use external sources to help you complete the this section. Q1. Why is each of the elements Nitrogen‚ Phosphorus‚ sulfur and iron included in lawn food? ______________________________________________________________________________________________________________________________
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Purpose: The purpose of the experiment is to calculate the enthalpy change occurring in the first of reaction of sodium hydroxide with hydrochloric acid and sodium hydroxide with ammonium chloride. Using Hess’ Law and the results for the enthalpy change of the first two reactions should give the enthalpy change of the third reaction of ammonia with hydrochloric acid. Procedure: Part 1: Construct a calorimeter of two nested stereophony cups where the cover has a hole to fir a thermometer. Measure
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10 mL graduated cylinder. A stir bar was placed into the 500 mL beaker and the rest of the procedure was performed identical to the above experiment. The concentration of calcium hydroxide was then calculated. Using the known concentrations of hydrochloric acid and calcium hydroxide‚ the equilibrium constant was calculated. Lastly‚ the Gibbs free energy was calculated. Sample calculations can be seen in the Data section of this report. The ΔG values and corresponding temperatures were graphed and
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b. A sample of 0.195 g of potassium was added to 500 cm3 of cold water. When the reaction was finished‚ 100 cm3 of 0.100mol/dm3 hydrochloric acid was added to form solution X. (i) Calculate the number of moles of hydroxide ions formed when the potassium was added to water. (ii) Calculate the number of moles of hydrogen ions in 100 cm3 of 0.100mol/dm3 hydrochloric acid. (ii) Give an ionic equation to represent the neutralization reaction. Q2. Manganese (IV) oxide catalyses the decomposition
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sugar Food Test | Food Items | Observations | Benedict’s Test-Non-reducing sugar.2cm3 of the food was added to a test tube followed by 1cm3 of hydrochloric acid and was boiled for one minute‚ then 1cm3 of sodium hydroxide (NaOH) and Benedict’s solution were added and the solution was brought to a boil. | White BreadCheeseCake | -When hydrochloric acid and bread were mixed together‚ a cream cloudy mixture was formed. When
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Abstract Tamoxifen‚ most commonly sold under the brand name Nolvadex‚ is the most widely used drug in the treatment of breast cancer during both early and late stages. It belongs to a class of drugs known as SERMs (Selective Estrogen Receptor Modulators). SERMs work by blocking the estrogen receptors in breast cells to prevent any binding with estrogen. It is consumed orally as a tablet or as a liquid (Anon.‚ 2017). The following paper discusses the discovery of Tamoxifen‚ its laboratory synthesis
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carbonate and hydrochloric acid. My hypothesis was that if the surface area to volume ratio of calcium carbonate was increased‚ then the rate of the reaction will increase because there are more particles that are accessible by the hydrochloric acid‚ thus more particles that can react with each other. Variables Independent- Surface area of calcium carbonate Dependent- Amount of carbon dioxide produced (cm3) Controls- Amount of calcium carbonate (g) Volume of hydrochloric acid (ml)
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How can we speed up the reaction between Calcium Carbonate and Hydrochloric Acid? Contents 1. Plan  Aim  Equipment  Variable Factors  Prediction  Method  Trial Run 2. Results  Results Tables 3. Analysis and Conclusions  Graphs  Conclusions 4. Evaluation  Accuracy Of Results  Reliability  Improvements  Extending the Investigation 1. Plan Aim I am doing this
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1. Depression plate 2. Sharpie marker 3. Dropper bottles: 1M hydrochloric acid‚ 1M sodium hydroxide‚ ammonia‚ vinegar‚ distilled water 4. pH indicator dropper bottles: bromothymol blue‚ red litmus paper‚ methyl orange‚ phenolphthalein Procedure: 1. Number the wells in the depression plate form 1-6 with the sharpie. 2. Into each well on the depression plate‚ add 10 drops of the following substances: a. Well 1: 1M hydrochloric acid b. Well 2: 1M sodium hydroxide c. Well 3: distilled water
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suitability of phenolphthalein and methyl red as acid base indicators. We found that the equivalence point of the titration of hydrochloric acid with sodium hydroxide was not within the ph range of phenolphthalein’s color range. The titration of acetic acid with sodium hydroxide resulted in an equivalence point out of the range of methyl red. And the titration of ammonia with hydrochloric acid had an equivalence point that was also out of the range of phenolphthalein.. The methyl red indicator and the phenolphthalein
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