Most chemical reactions have an optimal activity; they work best under specific conditions. Enzymes‚ for example are most active at specific temperature and PH. In humans enzymes are most active at the regulated body temperature of 37 degrees Celsius and PH. All homeostatic mechanisms use negative feedback feed back to maintain a constant value (called the set
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Background The melting point of a compound is the temperature at which the solid is in equilibrium with its liquid. A solid compounds changes to a liquid when the molecules acquire enough energy to overcome the forces holding them together. A mixture melting point is useful in confirming and used to indentify an unknown compound‚ which we will be doing in this particular experiment. Purpose Measure the melting points of pure benzoic acid and pure mandelic acid. Determine the eutectic composition
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yeast catalase reacting with hydrogen peroxide (H2O2). To address the latter question a series of experiments were conducted. The various temperatures experimented with were as follows: 22 degrees Celsius (room temperature)‚ 0 degrees Celsius (freezing)‚ 100 degrees Celsius (boiling)‚ and 37 degrees Celsius. Along with variations in temperature‚ the experiment involved different amounts of the two solutions being used. Using a spot plate containing 12 wells the different mixtures of hydrogen peroxide
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ABSTRACT/ SUMMARY After preliminary heating‚ the sample is cooled at a specified rate and examined at intervals of 1°C for flow characteristics. The lowest temperature at which movement of the specimen is observed is recorded as the pour point. INTRODUCTION In the cloud point experiment‚ waxes will appear and thickens the oil and clogs fuel filter and injectors in engines. The wax also accumulates on the cold surfaces and forms an emulsion with water. The appearances of cloud point determine
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the reaction of Barley alpha-amylase and starch. The predicted optimum temperature and pH is 50-60 degrees Celsius and pH of 5-6. To test this hypothesis‚ a starch solution was mixed with the amylase and then tested for absorbance‚ using a spectrophotometer‚ at several different temperatures and pHs. From these experiments it was concluded that the optimum temperature was 55 degrees Celsius and the optimum pH was 5. these results lead to the conclusion that the Barley seed is best suited to be in
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catalase would be most active at around 37 degrees body temperature. This means that in this experiment catalase would be most active in the water bath that is at 40 degrees Celsius. METHOD Before the experiment could be started the following apparatus needed to be obtained: Cork Borer Water Baths at 3‚20‚40 and 60 degrees Celsius Potato Ruler Stopwatch Detergent Hydrogen Peroxide Now that all this apparatus has been obtained‚ it is possible to start the experiment. Eight test tubes will be
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accordingly o get the mass of the calorimeter and that of the water. The lab instructed on the amounts of water and salt to be used. The initial temperature of the water in the KOH reaction was 22.8 degrees Celsius and the final temperature of the mixture determined from the graph was 37.0 degrees Celsius. The graph of the KOh showed it to be an exothermic salt and the KNO3 to be and endothermic salt because of the change in the temperature indicating either absorbing or giving off of heat by the salts
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colorless viscous liquid‚ with nasty characteristics odor. The physical properties are the following: Boiling point is 101 degrees Celsius‚ melting point is -29 degrees Celsius‚ relative density (water=1): 1.14‚ vapor pressure ‚ kPa at 20 degrees Celsius :3.7‚ relative vapor density (air=1): 2.1‚ flash point: 35 degrees Celsius‚ c.c. auto ignition temperature: 417 degrees Celsius‚ and explosive limits volume % in air: 7.3 -63. Toxic properties for Nitromethane: Very hazardous in case if ingestion
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Mashrek International School Investigate the Factors that Affect the Rate of Respiration in Yeast. (Temperature) Fawzi El Ansari Biology HL Title: Investigate the Factors that Affect the Rate of Respiration in Yeast. (Temperature) Aim: The aim of this experiment is to investigate the effect of changing the temperature on the rate of respiration in yeast. This will be done by placing equal amounts of yeast in each beaker that contains the same pH solution. Each beaker will be mixed with glucose
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The mass of Gliese 581 is 30 percent of the mass of the sun. Luminosity means how bright something is‚ and the luminosity of Gliese 581 is .2 percent of the Sun’s luminosity. From this information‚ we know that Gliese 581 is a very dim star! There are three confirmed and two other possible planets that orbit Gliese 581. Each of these five planets are close to the star and have a circular orbit. The planets orbiting Gliese 581 were named in the order they were discovered and are named Gliese e‚ Gliese
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