Experiment 5 Solution Preparation 1. Why should the solutions be prepared with 0.10M HCl used as solvent? a. What will happen to Fe3+ if the solution was not prepared using 0.10M HCl? b. Give the balanced equation for the 1st hydrolysis of Fe3+. c. What is the color of the product of 1st hydrolysis of Fe3+? d. What is the effect of the product of 1st hydrolysis to the absorbance of the solution? Determination of Analytical Wavelength 2. Why should the
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| | | | A | NaHCO3 – CO2 | It creates bubbles‚ it keeps uncolored | B | HCl and BTB | It changes to a strong yellow liquid | C | NH3 and BTB | It changes to blue liquid | D | HCl and blue dye | It changes green. | E | Blue dye and NaOCI | it first is blue and after add the HCl creates several colors‚ which are yellow‚ blue and green | F | NaOCl and KI | First a soft yellow‚ and after add the starch it changes to a black liquid. | G | KI and Pb(NO3)2 | It changes to a strong yellow
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orange | D | HCI and blue dye | The mixture is green. | E | Blue dye and NaOCI | Prior to adding the HCl the mixture was light blue‚ after the addition of HCl the mixture turns yellow. | F | NaOCI and KI | Prior to adding the starch the mixture turns brown‚ after adding the starch the mixture turns black. Foods tested: American Cheese- No starch‚ Fig Newton- Starch‚ Goldfish Cracker-Starch. | G | KI and Pb(NO3)2 | Mixture turns yellow & the precipitate after an hour lapse in time turned
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synthesis (during while a molecule of water is formed) -Maltose‚ Lactose‚ Sucrose ~ polysaccharides polymers of carbohydrates‚ three or more monosaccharides joined together through the process of dehydration synthesis. -Cellulose‚ Glycogen‚ Starch 3.2.4 Glucose-chemical fuel for cell respiration Lactose- makes up some of the slutes in milk Glycogen- stores glucose in liver and muscles. PLANTS Fructose- found in may fruits‚ makest them sweet Sucrose- often transported from leaves
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amylase • Tube 3 – 3 ml 0.2% amylase + 10 drops of 1.0M HCl • Tube 4 1 2 4 3 – 3 ml 0.2% amylase – place in hot water bath for 5 min Experiment #1: Carbohydrate Digestion • Add 5.0 ml starch solution to each tube • Incubate in 37°C bath for 1.5 hr • Divide contents of each tube evenly into 2 tubes – Lugol’s Test – Benedict’s Test Experiment #1: Carbohydrate Digestion • Lugol’s Test – presence of starch 2 1 1 2 3 4 • add a few drops of Lugol’s
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"CHEMISTRY REVIEW" PROJECT PAGES This Project Page first appeared in the November 1996 issue of Chemistry Review‚ Volume 6‚ Number 2‚ Pages 14 and 15. Chemistry Review is published four times during the academic year by Philip Allan Updates and is a journal for post-16 students. It contains a variety of interesting and colourful articles aimed at 16-19 year-olds taking mainly AS and A2 courses in chemistry. NOTE: Project Page is designed to help you think about your investigation. It is not
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Jocelyne Munguia|Date: 6/12/13| Exp 1: Observations of Chemical Changes|Lab Section: 75426| Data Tables: Part 1: |Chemicals|Well No.|Observations of the Reaction| A.|NaHCO3 + HCl|A2|Tiny bubbles formed around the edges. Under white paper it looked transparent‚ but under black paper there was some white in the middle. | B.|HCl + BTB|A3|The mixture turned yellow instantly. Under white paper the mixture was more of mustard yellow and under black paper it was less of a bright yellow. | C.|NH3 + BTB|A4|The
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pneumoniae does not produce proteases and cannot break down proteins via proteolysis. The fat hydrolysis test was performed to determine whether our bacteria produces lipase‚ an enzyme that breaks down fat. The fat hydrolysis test was positive‚ showing K. pneumoniae produces lipase and can break down fats. The indole test was performed to determine if our bacteria can break down tryptophan via the enzyme tryptophanase
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disassembled to monomers by hydrolysis‚ a reaction that is essentially the reverse of the dehydration reaction. HO 1 2 3 H Short polymer HO Unlinked monomer Dehydration removes a water molecule‚ forming a new bond HO 2 1 H 3 H2O 4 H 4 (a) Dehydration reaction in The synthesis of a polymer H Longer polymer HO 1 2 3 Hydrolysis adds a water molecule‚ breaking a bond H2O (b) Hydrolysis of a polymer HO 1 2
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w w w e tr .X m eP e ap UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Advanced Subsidiary Level and Advanced Level .c rs om *0485738200* BIOLOGY Paper 2 Structured Questions AS Candidates answer on the Question Paper. Additional Materials: Electronic calculator Ruler (cm/mm) 9700/21 October/November 2009 1 hour 15 minutes READ THESE INSTRUCTIONS FIRST Write your Centre number‚ candidate number and name in the spaces provided at the top of this
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