Chemists Institute was contracted by a local food manufacturer to determine if sodium benzoate‚ a common food preservative‚ undergoes significant chemical changes at the pH level encountered in the acidic environment of the stomach. Experimental Method Sodium benzoate was prepared by addition of an equimolar amount of aqueous sodium hydroxide (3 M‚ ~ 20 ml) to a benzoic acid (1.256 g‚ 10.3 mmol) /water mixture (10 ml). Benzoic acid is insoluble in water. The hydroxide base rapidly deprotonates
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Are We Too Dependent on Computers? By: Sabrina Gopar Corro Since their invention‚ people far and wide have become increasingly dependent on computers. Computers have found their way into just about every aspect of our lives‚ and in most cases‚ they make things easier for us. They allow us to work from home‚ socialize with our friends and family who live too far away to visit‚ and they provide a stress relief when we come home from school
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activity of the enzyme catecholase in different pH levels as well as its absorbance in differently concentrated solutions. A spetrophotometer was used to measure the absorbance of the enzyme catecholase in different pH solutions as well as to measure the absorbance of catecholase in solutions with different concentrations of potato juice and phosphate buffers. Absorbance of the enzyme catecholase was at an optimum level when pH was close to neutral. When pH was acidic or basic‚ the catecholase was less
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Objective: To investigate how pH affects the rate of protein digestion Hypothesis: I predict that since pepsin breaks down the material the quickest at a pH of 2 in the stomach‚ test tubes #3 will reduce the greatest because it has pepsin to further break down the egg. Whereas the other test tubes will have a smaller reduction. I think test tube #2 will have the second largest reduction rate and then #6 because they all will have a greater rate at breaking down the material‚ Then‚ I predict the
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condition now is getting darker and dim (perhaps shosw that he lost his courage‚ blurr need support‚ likely to give up)‚ and that’s why he need this mary comes into picyurento help him‚ support him and telling him what to do. The third stanza‚ basically‚ means persona has worked hard no matter what happens( cold dew)to gain the roses‚ by joining hands‚ went to house back and forth and like a beggars‚ begging for roses. He never gives up and keep asking. Not care about anything‚ exhausted or not‚push aside
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pH & Enzyme Action Aim: To inspect the effects of the pH on enzymes. Apparatus: 100 cm³ Beaker 3 – 5cm³ Syringes 2 Test Tube Racks with 8 Test Tubes Stop-watch Ruler Dropping bottle of detergent Marker Pen Masking Tape 400cm³ Hydrogen Peroxide 200cm³ Liver Catalase Solution 100cm³ of following Buffer Solution – pH5 pH7 pH9 pH11 Method: The materials were collected. The test tube rack one with 4 test tubes had been labelled A to D. The 2cm³ of each buffer solution
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-Enduring Love- This text belongs to the novel Enduring Love written by Ian McEwan. The extract is set at the beginning of the novel when Joe retells the events of the accident that will shape Joe and Clarissa’s lives forever. The main theme of the extract is the unexpected turns of life‚ and the binary position between order & chaos. We may relate the former theme with the way that Joe’s life changes in one minute‚ and the feeling of not being able to control the situation. And‚ the latter
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Elvira Goloborodko Science color 11/3/14 You may use any reliable source to investigate and find the information needed to complete this assessment. Recall that personal web pages‚ company advertisements‚ and other similar web based resources may not be reliable. The best resources will be governmental‚ educational‚ or scientific in origin. 1. In your own words‚ explain how Doppler radar works. Describe the properties of electromagnetic
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Abstract Color is everywhere‚ everyday. It can be interesting and helpful to research the ways that color can affect a person’s everyday lives‚ not just for artists and photographers. Different colors can convey feelings and affect a person’s mood and behavior in many ways. The basic research question for this paper is: In what ways do colors affect one’s mood and how can they be used to people’s advantage? These answers can be found by reviewing journals‚ books‚ and articles that feature expert
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John Pamintuan 3-2-13 Pd 6 Favorite Color Essay With all the beautiful colors out there‚ I have to say that my favorite color is blue. Blue symbolizes loyalty that is why it is preferred to wear a blue tie or dress during a job interview and also the reason cops have blue uniforms. This color is present everywhere through the infinite deep sky and ocean releasing a peaceful vibe‚ which you can’t help but relax. It has a wavelength of about 470 nm‚ third shortest after indigo and violet. The
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