Extraction of Caffeine from Tea Leaves using Dichloromethane (CH2Cl2) Abstract The extraction of caffeine (C8H10N402) was done in two parts. The first procedure used was solid-liquid extraction which was done by boiling the tea leaves in 100 ml. distilled water for 5-10 minutes. The filtrate was acquired and was extracted again by liquid-liquid extraction using dichloromethane (CH2Cl2). The combined DCM (CH2Cl2) was washed and dried to yield crude caffeine. The crude caffeine was purified
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The sculptors who created Blue Woman in Black Chair and Untitled (Large Man) used many aspects to give life and meaning to their creations. Lines are used distinctly in both sculptures. The artists take advantage of space when creating their pieces along with a little naturalism. One sculptor uses color on his figure. Their technique‚ although different‚ brings individuality and texture to their works. The Blue Woman in Black Chair is a natural art piece created by George Segal. It is a woman who
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List of Tables iii Introduction iv INGREDIENTS 1.0 Mobile Phones 1 2.0 Speech CODEC 1 3.0 DSP in Medicine 3.1 Hearing Aid 3 3.2 The Acquisition of a blood pressure signal 4 3.3 IIR filters to extract alpha activity from EEG signal 5 4.0 ADAPTIVE ARRAY IN SMART ANTENNA TECHNOLOGY 6 4.1 TYPES OF SMART ANTENNA 7 4.2 ADAPTIVE ARRAY SYSTEMS 8 4.3 BASIC WORKING MECHANISM 9 4.4 BENEFITS OF SMART ANTENNA TECHNOLOGY
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Light Absorption by Photosynthetic Pigments in Silver Beet Abstract The aim of the experiment was to determine the absorption of differing wavelengths of light by individual pigments in the vegetable silver beet. Pigments were extracted from silver beet leaves and separated into chlorophyll a‚ chlorophyll b‚ and carotene via chromatographs. Chlorophylls were then separated and an absorption spectra created using results obtained from a spectrophotometer. It was clear there were two distinct peaks
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Scattering of Light | The scattering of light is an important observation in our daily life. The way light scatters off molecules in the atmosphere explains why the sky is blue and why the sun looks red at sunrise and sunset. This is because of the scattering of light. | | | Tyndall Effect A beam of light or laser‚ invisible in clear air or pure water‚ will trace a visible path through colloidal particles. This is known as the Tyndall effect after its discoverer‚ the 19th-century British
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Photosynthesis Maria Diaz March 12‚2012 Pre-Lab Questions 1. Which two variables are controlled in a similar manner? The two variables that can be controlled in a similar manner are CO2 & the light level. 2. How can you get the results to the investigation faster? You can get the results to the investigation faster by adjusting the speed at the bottom of the water weed simulation. 3. How will you be able to determine the rate of photosynthesis in this simulation
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energy saving of street lights with light depending resistor. Nowadays‚ human has become too busy and he is unable to find time even to switch the lights wherever not necessary. This can be seen more effectively in the case of street lights. The present system is like‚ the street lights will be switched on in the evening before the sun sets and they are switched off the next day morning after there is sufficient light on the roads. But the actual timings for these street lights to be switched on are
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PHOTOSYNTHESIS LAB Alyssa Wright VARIABLE: LIGHT INTENSITY AIM: to investigate the effect of light intensity (lux) on the amount of oxygen produced (number of bubbles) HYPOTHESIS: I predict that the rate of oxygen produced increases‚ as the light intensity increases‚ but only to a point. I predict this will happen because the plant will have enough carbon dioxide and water to keep up with the amount of light that there is. When there is less light intensity‚ photosynthesis will happen
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Acapulco Leaves Acapulco (Cassia alata) also known as “bayabas-bayabasan” and “ringworm bush” in English‚ this herbal medicine is used to treat ringworms and skin fungal infections. • Calamansi • Infused Oil (Olive oil‚ dried herbs) an infused oil consists of carrier oil (also known as vegetables oil‚ base oils‚ or fixed oils‚ are used to dilute essential oils and absolutes before applying to the skin.) that has been permeated (infused) with one or more herbs. The benefit to using an infused
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boiling tube * anti- bumping granules * forceps * test tube holder * white tile * leaf to be tested (hibiscus leaves are excellent) * 90% ethanol * iodine/potassium iodide solution PROCEDURE: The video above shows the steps in Testing a Leaf for the Presence of Starch. The Procedure outlined below is slightly different. 1. Remove a green leaf fom a plant that has been exposed to sunlight for a few hours 2. Half-fill a 250cm3 beaker with water. Heat the water until
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