procedure‚ pages 118-119. Parts 1-3. Part 1: Melting points of Urea and Cinnamic Acid. Part 2: Melting point of unknown. Part 3: Melting point of Mixture- Urea and Cinnamic Acid (take melting points of mixtures in 1:4‚ 1:1 and 4:1 ratios). Reactions Main Reaction: Not a chemical reaction but a physical reaction. Urea in solid mixed with water melts when heated. Then through filtration and drying‚ the liquid mixture yields the pure Urea. This is the same main reaction for Cinnamic Acid‚ mixtures
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PRODUCTS 1 Urea 2 Di-Ammonium Phosphate (DAP). 3 Calcium Ammonium Nitrate (CAN). 4 Ammonium Sulphates (AS) 5 Single Super Phosphate (SSP) 6 Nitro phosphate (NP) 7 Sulphate of Potash 8 Zinc Sulphate 1. Urea: More than 90% of the world’s production is destined for use as a nitrogen-release fertilizer. Urea has the highest nitrogen content of all solid nitrogenous fertilizers in common use (46.7%). 2. Di-Ammonium Phosphate (DAP): It contains 46% P2O5 and 18% N.
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Permeability: Activity 1: Simulating Dialysis (Simple Diffusion) Lab Report Pre-lab Quiz Results You have not completed the Pre-lab Quiz. 09/20/11 page 1 Experiment Results Predict Question: Predict Question 1: The molecular weight of urea is 60.07. Do you think urea will diffuse through the 20 MWCO membrane? Your answer : c. No‚ not at all. Predict Question 2: Recall that glucose is a monosaccharide‚ albumin is a protein with 607 amino acids‚ and the average molecular weight of a single amino acid
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answer : a. 20 MWCO Correct answer: d. 200 MWCO 4. Avogadro’s number is a constant for the number of You correctly answered: b. molecules. 08/30/14 page 1 Experiment Results Predict Question: Predict Question 1: The molecular weight of urea is 60.07. Do you think urea will diffuse through the 20 MWCO membrane? Your answer : c. No‚ not at all. Predict Question 2: Recall that glucose is a monosaccharide‚ albumin is a protein with 607 amino acids‚ and the average molecular weight of a single amino acid
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35.45 3. Which MWCO dialysis membranes allowed both of these ions through?50‚ 100 and 200 4. Which materials diffused from the left beaker to the right beaker Urea‚ NaCl and glucose diffused 5. Which did not? Why? Albumin‚ because it is too large to diffuse Activity 2: Simulating Dialysis 1. What happens to the urea concentration in the left beaker (the patient)? Its concentration gradient changes and causes it to move down 2. Why does this occur? It happened because the more
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internal environment is regulated to maintain homoeostasis. It is the elimination of the unwanted products of metabolism and of substances present in excess within the organism. Animals excrete nitrogenous waste products such as ammonia‚ uric acid or urea. These or similar products to that produced by the deamination of any excess protein that has been eaten as nitrogenous compounds are formed in metabolism of proteins and nucleic acids. Ammonia is lost by diffusion from small aquatic organisms but
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pores in the membranes. 4/ Avogadro’s number is a constant for the number of : molecules Experiments 20 MWCO : Na+Cl- no diffuse ; Urea no diffuse (9.00 mM) 1/ The reason sodium chloride didn’t diffuse left to right is that : - the membrane pore size was too small 2/ The molecular weight of urea is 60.07 . Do you think urea will diffuse through the 20 MWCO membrane? No‚ not at all ( Predict Ques. 1) 3/ Glucose is a six-carbon sugar. Albumin is a protein with 607
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(test strip matches key on bottle) Amino acid test (with biuret turns purple) Urea test (with‚ 5 grams‚ urease + phenolphthalein turns pink) Salts test (with silver nitrate turns to a white solid) 1 - - + - 2 - + _ + 3 + + + + 4 - - + + 5 + - + + Normal key Glucose – Amino acid – Urea + Salts + Patient number 1 had normal results except for the urea test. Patient number 2 tested negative (-) for glucose and urea tests and
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two different pure solids‚ urea and trans-cinamic acid‚ two compounds with similar melting points. 3- We will then determine the melting point ranges of onemixtures of these two substances‚ and plot the eutectic point diagram to generate a melting point pattern for the two solids. * Experimental procedure a) Equipments: 1- Melting point apparatus 2- Glass tubing 3- Capillary melting point tube 4- Very small‚ finely powdered pure urea‚ pure cinnamic acid and three
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excretion: Skin: Salt and water in sweat Lungs: Removal of CO2 from respiration in every body cell. (CO2 lowers blood pH and can lead to death). Kidneys: Removal of nitrogenous waste in urine. (Too much can lead to kidney stones and bone loss.) Urea is produced from excess amino acids. Nitrogenous Excretion: When proteins are metabolised they produce carbon dioxide and water‚ but also nitrogen-containing products. To metabolise amino acids containing the nitrogen‚ the amino group has to
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