Name ___________________________________________ Date ___________________________________ Block ____ Experiment 12A Investigating chemical equilibrium ABSTRACT 1. What is equilibrium and how can you tell it has been reached? __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________
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’wetter ’ so that it is less likely to stick to itself and more likely to interact with oil and grease. Soaps are sodium or potassium fatty acids salts‚ produced from the hydrolysis of fats in a chemical reaction called saponification. Each soap molecule has a long hydrocarbon chain‚ sometimes called its ’tail ’‚ with a carboxylate ’head ’. In water‚ the sodium or potassium ions float free‚ leaving a negatively-charged head. Soap is an excellent cleanser because of its ability to act
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conditions of bleach’s stored at different temperatures. Introduction: Chlorine bleaches are made by dissolving chlorine in sodium hydroxide solution. They have a number of uses as they are used to remove colors‚ whiten or disinfectant via oxidation. Many bleaches have strong bactericidal properties‚ and are used for disinfecting and sterilizing as they contain chlorate ions. Sodium Thiosulphate is used in the pH testing of bleach substances as it neutralizes the color-removing effect of the bleach and
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for an example of Hess’s Law. (2pt) 2. If the accepted enthalpy change value for the dissolving of sodium hydroxide in water is −44.2 kilojoules per mole‚ determine the percent error of the experimental value that you calculated in Part I. Show your work. (experimental - actual value) / actual value × 100 % 3. If the accepted heat of reaction for the neutralization of hydrochloric acid with sodium hydroxide is −56.0 kilojoules per mole‚ determine the percent error of the experimental value that
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alternative method of subtraction to find the mass of the sodium chloride directly. Start with a mixture of sand (SiO2)‚ sodium chloride (NaCl)‚ and ammonium chloride (NH4Cl)‚ and use these separation processes: sublimation filtration evaporation First "sublimate" the ammonium chloride (NH4Cl); heat the mixture until the ammonium chloride (NH4Cl) passes into the gaseous phase. The remaining solid will be a mixture of the remaining two compounds‚ sodium chloride (NaCl) and sand (SiO2); these compounds
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nitrogen and halogens – elements that are most of the time the only ones involved in organic compounds. The experiment focused on the Sodium Fusion test‚ which tested for all elements except oxygen. In the test‚ the test compound is broken down into its elements‚ which then bond individually with sodium. The presence of sulfur was tested either with lead acetate or sodium nitroprusside. The presence of nitrogen was tested with ferrous ammonium sulfate and potassium fluoride. The presence of any halogen
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mean by autoprotolysis? 30. Mention uses of H2O2. 31. What is Per hydrol & Hyperol? 32. Lithium reacts with water less vigorously than sodium. Give your reason 33. Explain the Biological importance of Mg & Ca. 34. What happens when Magnesium burnt in air? 35. Describe the importance of Plaster of Paris. 36. Describe the important uses of Caustic Soda‚ Sodium Carbonate & Quick lime. 37. Explain inert pair effect. 38. Give the formula of Borazine. What is its common
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withers. Isotonic environments are preferred by most microbes for the most advantageous growth‚ although some live in slightly hypotonic solutions. (Alonzo‚ 2008) Growth in NaCl Solutions Samples of S. cerevisiae and S. epidermidis were placed into sodium chloride (NaCl) solutions of 1‚ 7 and 15 percent which were supplied in the lab kit. The S. cerevisiae results are as follows. After 24 hours of observation there was a moderate amount of growth in the 1% NaCl solution which had a cloudy overall
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of the solution as soon as it starts to boil. 8) Repeat steps 3‚ 6 and 7 using distilled water. 9) Make observations. Expected results: the boiling point of the salt solution will be higher than the boiling point of the distilled water because sodium chloride is a non- volatile substance and an impurity when added to water. Therefore the substance does not change to vapour under normal heat conditions‚ because the bonds in the substances are stronger so a lot of heat must be applies and this will
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Desiree Trujillo March 6th‚ 2013 Lab # 3 Chemistry 101 Physical & Chemical Properties Purpose To examine the physical and chemical properties of multiple natural chemical substances‚ and to determine which changes are chemical and which are physical. Data Solubility or Reaction | SubstanceName | Color | Odor | Effectof Heat | ColdH2O | HotH2O | LitmusTest | DiluteHCl | DiluteNaOH | Mg | Silver
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