Objective: To extract caffeine from tea powder using polar - nonpolar solvent extraction technique. Theory: The technique used to separate an organic compound from a mixture of compounds is called Extraction. Extraction process selectively dissolves one or more of the mixture compounds into a suitable solvent. The solution of these dissolved compounds is referred to as the Extract. Here the organic solvent dichloromethane is used to extract caffeine from an aqueous extract of tea leaves
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Erikson and the Wild Strawberries In the Life Cycle Completed by Erik H. Erikson‚ Erikson talks about the stages in life those stages range from infancy to elderly age. The stages are basic trust vs. basic mistrust‚ autonomy vs. shame and doubt‚ initiative vs. guilt‚ industry vs. inferiority‚ identity vs. identity confusion‚ intimacy vs. isolation‚ generatively vs. stagnation‚ and finally integrity vs. despair. In Wild Strawberries the character Isak Borg goes through all the stages that Erikson
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EXTRACTION OF METALS SUMMARY Most metals exist in compounds in rocks in the Earth’s crust. Many of these ores contain oxides or sulphides of the metals. The compounds need to be reduced to produce the metals as elements. Metals are very useful to us because of their special properties. Reduction means removal of oxygen or gain of electrons. Carbon is a good chemical reducing agent because it readily combines with oxygen‚ but it is only useful for the metals below it in the Reactivity
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speaking up means they will be deported back to their country of origin. Working conditions are of great concern because they face many health risks‚ from being highly exposed to pesticides to having back problems from being bent all day picking up strawberries and other products. Yet not only are the workers highly at risk‚ but so are their families and especially children.
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Experiment 2: Extraction – Evaluation Summary Labs reports must be typed and chemical structures must be drawn with ChemDraw. Report must not exceed three pages (including this page). Page limit does not include any attached spectra or references. ** Deductions for hand written report/structures and exceeding page limit ** Report Breakdown Data/Results: _________________ /10 Discussion: _________________ /10 Report Total: _________________ /20 Other Lab Marks
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I can still taste a bit of the strawberry on my tongue. When Eva kissed me‚ I fully knew she wasn’t sober. I knew it. I could smell the cocktail on her breath‚ hear it in her words‚ and taste it as she pressed her soft lips to mine‚ but there was something about her‚ something in the way her body fit in my arms‚ something in the way she smelled – chocolate‚ peach and that damn strawberry – that made her alluring. And now? Now she sits in the back seat‚ staring at the drops of rain that poured
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Strawberry Hermit Crab - Coenobita perlatus Kingdom - Animalia Phylum - Arthropoda Class - Malacostraca Order - Decapoda Family - Coenobitidae Genus - Coenobita Species - C. perlatus Appearance This terrestrial hermit crab is bright red with small white dots like the color of ripe strawberries. Young hermit crabs tend to be a pale reddish orange‚ as they moult‚ they become more red. They are arthropods which
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SOLVENT EXTRACTION Solvent extraction‚ also known as liquid extraction and partitioning‚ is a method to separate compounds based on their relative solubility in two different immiscible liquid‚ usually water and organic solvent. It is an extraction from one liquid phase to another liquid phrase. Liquid extraction is a basic technique in chemical laboratories‚ where it is performed using a separator funnel. This type of process is commonly performed after a chemical reaction as part of the work-up
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Extraction Report For experience 4c we were supposed to determine which one is the organic layer in three different tubes that has two layers. To determine which is aqueous (water) or organic‚ I used the technique of adding droplets of water to each tube. If the layer is water‚ then the drops of added water will dissolve in the aqueous layer and increase it’s volume. If the added water form droplets or a new layer‚ then it is the organic layer. Tube 1 (water and n-butyl chloride)‚ after adding
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Extraction of metals The History of Metals. Metals have been used by people for many thousands of years. Gold and silver‚ found as native metal‚ were used both as jewellery and as a status symbol - nothing new there. These metals were known in the Stone Age‚ but gold and silver are too soft to be used as tools. The first really useful metal to be discovered was bronze. This began the Bronze Age. Bronze was used extensively for tools and weapons in Asia and Africa from 4‚500 B.C. (6‚500 years
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