sodium diazobenzenesulfonate was mixed with a solution of N‚N-dimethylaniline in hydrochloric acid. The first product obtained from the coupling was a bright red acid form of methyl orange called helianthin. In basic medium‚ through the addition of a dilute solution of sodium hydroxide‚ helianthin is converted to the orange sodium salt known as the methyl orange. INTRODUCTION Para-nitrobenzeneazoresorcinol dye and methyl orange belong to a class of dyes known as “azo colors” which contain the
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Rossi/Kuwata Chemistry 222 Spring 2011 Experiment 2: Spectrophotometric Determination of Iron in Vitamin Tablets (Adapted from Daniel C. Harris’ Quantitative Chemical Analysis and R. C. Atkins‚ Journal of Chemical Education 1975‚ 52‚ 550.) Experimental work to be done on February 24 + one hour scheduled on your own Notebook due on March 4 (by 4:00 pm ⇒ 20% late penalty each 24 hour period thereafter) INTRODUCTION In this experiment‚ you will dissolve the iron in a vitamin supplement tablet‚
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the ornithine cycle. This is because urea is less toxic than ammonia and requires less water for elimination‚ meaning urine can be produced and excreted from the body. Moreover‚ urea is a very small molecule and can easily diffuse across permeable membranes such as the capillaries in the glomerulus. The kidney contains numerous functional units called nephrons‚ which produce urine through a series of steps: ultrafiltration of the blood; selective reabsorption of the filtrate and secretion of the
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Fischer Esterification – nucleophilic substitution reaction Strong acid catalyst (concentrated sulfuric acid Purpose of a reflux is to heat a reaction mixture at its boiling temperature to form products‚ without losing any of the compounds in the reaction flask TO HAVE GREAT PERCENT YIELD: As reaction is reversible‚ removal of water or the addition of an excess of one of the reactants (cheaper one) drives the reaction towards formation of ester. (Excess carboxylic acid is used) Adding excess
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CH. 25 1. At which stage of life is the percentage of fluid in the human body highest? Infancy 2. In elderly individuals‚ 75% of body weight is made up of fluid. True False 3. When comparing two individuals of the same body weight‚ the one with more muscle and less fat will have a higher percentage of fluid in their body. 4. When comparing a lean adult female to a lean adult male‚ which will most likely have a higher percentage of body fluid? The Male 5. Fluid imbalances are more common
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Homeostasis A state of balance in the body Whoa Homeostasis “the tendency of a system‚ esp. the physiological system of higher animals‚ to maintain internal stability‚ owing to the coordinated response of its parts to any situation or stimulus tending to disturb its normal condition or function” - Dictionary.com Unabridged (v 1.1) “The ability or tendency of an organism or a cell to maintain internal equilibrium by adjusting its physiological processes.” - American Heritage Stedman’s Medical
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Chapter 2: Patterns in Nature 1. Cell theory • 1590: Dutch grind glass lens (1st compound microscope) • 1665: Robert Hooke uses compound m. analysis thin cork slices as filled with air enclosed in boxes (cells) distinct • 1676: Dutch sees microorganism under microscope from pond water • 1824: French suggest all organisms composed of cells • 1827: Robert Brown (Brownian motion) discovered nucleus in plant cell • 1838: German produced evidence that all organisms made of cells • 1859:
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Title: Chemical Properties of Alkanes. Aim: To test the reactivity of alkanes using cyclohexane as an example. Apparatus/Materials: Cyclohexane‚ liquid alkane‚ aqueous bromine‚ test tubes‚ light source‚ watch glass‚ splint‚ 0.1 MKMnO4‚ concentrated H2SO4‚ dilute H2SO4. Method: Combustion: 1. A watch glass was placed on a benched protection sheet in a fume cupboard and the extractor in the fume on. 2. 4 drops of cyclohexane was placed on the watch glass using a teat pipette. 3. The bottle of
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of Diabetic Coma Diabetes is any disorder of the metabolism which causes excessive thirst and the production of large volumes of urine. A coma is a state of unrousable unconsciousness. (Martin (2002)) There are two types of diabetes: Diabetes Insipidus (DI) is a rare metabolic disorder‚ the symptoms of which are the production of large quantities of dilute urine and an increased thirst. It is caused by a deficiency of the pituitary hormone Anti-diuretic hormone (ADH / vasopressin) which regulates
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compound. Method 1. Clean a platinum or nichrome wire by dipping it into concentrated hydrochloric acid. 2. Hold the platinum or nichrome wire at the hottest or blue part of a non-luminous Bunsen flame. 3. Repeat until the wire does not produce any colour in the flame (note: do not touch the wire‚ as salt in sweat will produce an intense sodium flame). 4. Once achieved‚ dip the nichrome wire in concentrated hydrochloric acid‚ and then dip it into a small amount of the unknown solid
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