# Passage 1 # Can we see (1) ......... the earth is a globe? Yes‚ we can‚ when we watch a ship that sails out to sea. If we watch closely‚ we see that the ship begins (2) ........ . The bottom of the ship disappears first‚ and then the ship seems to sink lower and lower‚ (3) ......... we can only see the top of the ship‚ and then we see nothing at all. What is hiding the ship from us? It is the earth. Stick a pin most of the way into an orange‚ and (4) ......... turn the orange away from you
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PLANNING COURSEWORK- STARCH AND AMYLASE AIM The aim of this coursework is to investigate the effect of temperature change‚ on the rate of hydrolysis of starch catalysed by amylase. PREDICTION I think that as the temperature increases‚ the rate of reaction also increases‚ to a point when it dramatically decreases. On graph 1‚ you will see a sketch of the graph which I expect to be the result of the experiment. SCIENCE REASONING I think my prediction is correct because the rate of
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pH Affecting on Amylase Enzyme Is there a difference in the concentration of pH in the amylase enzyme activity? The null hypothesis would be that there will be no difference in the concentration of pH and alternative hypothesis would be that there will be a difference in the concentration of pH. The predication if that there will be a difference in the concentration of pH. The pH affects on enzyme activities‚ one of the enzyme that was used in the process was amylase. When a serial dilution was
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Tutorial #3 1. The discovery of the cell occurred in 1665. The cell has made great progress in the discovery of how humans and other organisms work. 2. The discovery of genetic material in DNA occurred in 1865. This allowed us to determine different traits in mammals. As well as how we can determine different traits‚ and the percent chance of obtaining these traits. 3. In 1885 the cell culture technique was first developed. This allows us to view cells outside of their environment
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Introduction: The purpose of this lab was to check the time needed for salivary amylase and phosphorylase to produce a negative result and how different concentrations affected those times. Enzymes are biological catalysts that can cause a specific chemical change in any part of the body (Walsh‚ 2002). Many of the reactions that take place within a cell would normally take place at temperatures substantially higher than those present inside a cell (Alberts et al.‚ 2010). Because of this‚ these chemical
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CHEMICAL KINETICS: IODINE-CLOCK REACTION DATE SUBMITTED: 14 DECEMBER 2012 DATE PERFORMED: 7 DECEMBER 2012 ABSTRACT Chemical kinetics involving reaction rates and mechanisms is an essential part of our daily life in the modern world. It helps us understand whether particular reactions are favorable and how to save time or prolong time during each reaction. Experiment demonstrated the how concentration‚ temperature and presence of a catalyst can change the rate of a reaction. 5 runs of dilution
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An investigation on the activation energy for the iodine clock reaction Introduction: The iodine clock reaction is a presentation of chemical kinetics‚ which are the elements that affect the rate of chemical reactions. When the two colorless solutions are incorporated together‚ no reaction can be spotted. But after a short period of time‚ the solution turns into a dark blue solution. The term rate of reaction is stated as the decrease in the concentration of one of the reactions or the increase
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JULIA SELORMEY BIO 111 Iodine Description: Is a trace mineral that your body uses in small amounts to synthesize thyroid hormones that are necessary for regulating the body growth‚ development‚ metabolism and body temperature. Most of the iodine in the body is found in the thyroid gland‚ but is found also in the blood and muscles. The body contains approximately 20 to 30 mg of iodine which is mostly stored in the thyroid gland located in front of the neck. Food sources: Milk is the major
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Investigating the effects of changing concentration: iodine clock reaction. Abstract This is an experiment to show the Iodine Clock Reaction. To create a chemical reaction to see how long it takes for solution to change to a dark blue Color. When changing the concentration of the iodide (K1) and adding distill water to make it up to 5cm³ each time. This is to see if the reaction takes less with less concentration or faster with more concentration added to the peroxodisulphatee. So with the solution
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amount of amylase is the best to produce a better reaction with starch? A 1% solution of amylase‚ made from 0.15g of amylase added to 15ml of water‚ a 2% solution of amylase made of 0.3g of amylase added to 15ml of water‚ and a 0.5% solution of amylase made of 0.75g of amylase to 15ml of water were created. A 0.25% starch solution was also created‚ and 3ml was added to each of the 4 test tubes. 1 drop of iodine was added to each test tube. 4ml of the 1% solution was added to the first test tube‚ 4ml
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