I. Results Started with : 40mL acetic acid 4.005g PHPB 2.00g trans-stilbene 1.54g KOH 13mL methanol 21mL ethylene glycerol 2.726g stibene dibromide produced Actual yield : 0.818g diphenlacetylene Melting Point : 62 - 75 degrees Celsius II. Discussion The experimental melting point range of our purified product was 60 degrees Celsius when researched‚ but when done experimentally was only. This began around the right range‚ but ended up being much higher than the literature value
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Biology exam Endocrine system: Hormones: chemical messengers that coordinate the body’s activates. Substances secreted by cells that act to regulate the activity of other cells in the body. They are part of the endocrine system and they are slow acting but have a longer affect than neurotransmitters. Functions: * regulate growth‚ development‚ behavior‚ and reproduction. * Maintain homeostasis * Regulate metabolism and water and mineral balance * Respond to external stimuli
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DNA molecule at a particular place called restriction sites. Restriction enzymes also recognize a specific sequence of nucleotides‚ which vary between 4 and 8 nucleotides‚ in particular‚ palindromic. These restriction enzymes were kept in a 50% glycerol buffer that does not freeze at -20 oC. The four available enzymes used for this experiment were EcoRI‚ AvaI‚ HincII‚ and RsaI. The lengths of the DNA fragments from the restriction digests are used to map the relative locations of the four available
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A&P II – Test 3 – Rider Urinary System: Q 1. a) What are the different parts of urinary system. The 2 kidneys‚ The 2 ureters‚ the Urinary Bladder and the Urethra. b) What is nephron? Name different parts of a nephron. Write absorption and secretion of different parts of a nephron. Nephron: It is the functional part of the kidney‚ encharged of filtration of blood and eliminates the nitrogenous waste of our bodies. The nephron consists of: functional units; two parts: renal corpuscle
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Lab 2: The Chemistry of Life Name _____Aniqa Qureshi_ Insert the chemical symbol in the answer blank for each of the following elements. ___O______ 1. oxygen ___C______ 2. carbon ___K______ 3. potassium ___I______ 4. iodine ___H______ 5. hydrogen ___N______ 6. nitrogen ____Ca_____ 7. calcium ____Na_____ 8. sodium ____P_____ 9. phosphorus ____Mg_____ 10. magnesium ____Cl_____ 11. chloride ____Fe_____ 12. iron In the space below‚ list the chemicals (above) from the MOST
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with taking the 2cm long frog muscle and placing it on the petri dish. Then slicing‚ using the cutting tool‚ the muscle into threes. Immediately after transferring the three muscle parts to three microscope slides and immersing the muscle parts into glycerol. Measuring each frog muscle part and recording before adding the solutions. Then on each slide putting 2-3 drops of one of the solutions (A‚ B and C). Then waiting 30-60 seconds and measuring each strand again and recording
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Science End Of Year Revision: Biology 1. Animal and Plant cells 2. Specialized animal and plant cells 3. The 7 life processes: 4. A group of SIMILAR CELLS is called a TISSUE. A group of DIFFERENT TISSUES forms an ORGAN. A GROUP OF ORGANS working together from an ORGAN SYSTEM‚ or even a WHOLE ORGANISM. CELLS TISSUE ORGAN ORGAN SYSTEM 5. Example of this sequence in plants. …which‚ with other tissues make up a leaf (an ORGAN)… …which‚ with other tissues
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carbohydrates but in different proportions). Fats are the most concentrated supply of kilojoules‚ containing twice as much as carbohydrate or protein. Fats are commonly known as lipids and are made up of two groups of simple substances- fatty acids and glycerol. Some fatty acids can be made by the body. Other fatty acids must be provided by food – these are known as essential fatty acids. These are required for regulating cholesterol metabolism and maintaining cell membranes. Fats are classified as
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soaps a triglyceride - olive oil reacted with a basic solution which was NaOH to form a glycerol molecule and a soap. Soaps have a hydrophilic end‚ which is the carboxylic acid region and a hydrophobic end‚ which is the chain from the fatty acid on the actual soap‚ this is called saponification. It can be reversed by the process of esterification(2). Once each starting material was mixed was hydroxide and glycerol the solutions were heated which helped the chains break apart and become thick and pasty
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a saturated or unsaturated fatty acid esterified to a phosphate group which is also attached to a glycerol molecule (2) only a saturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached (3) only a unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached (4) a saturated or unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached (4) Perisperm differs from endosperm in: (1)
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