"Purification Of Caffeine By Sublimation" Essays and Research Papers

Purification Of Caffeine By Sublimation

SUBLIMATION Sublimation is a technique used by chemists to purify compounds. Typically a solid is placed in a vessel which is then heated under vacuum. Under this reduced pressure the solid volatilizes and condenses as a purified compound on a cooled surface, leaving the non-volatile impurities behind. This cooled surface often takes the form of a "cold finger" (shown in the diagram above). Once heating ceases and the vacuum is released, the sublimed compound can be collected from the cooled surface...

Carbon dioxide, Gas, Liquid 894  Words | 2  Pages

Open Document

Extraction and Sublimation of Caffeine

and Sublimation of Caffeine from Tea Leaves By: Ashley Barnes CH 236 – P8 Experiment 4 & 4.5 Due: 10/15/2014 Table 1. Table of Reagents Discussion The extraction yield refers to the percent of caffeine in the tea leaves at start of the extraction experiment. Tea leaves had 0.55 grams of mass per eight ounce serving. The weight of the extracted crude caffeine was 0.264 grams. Therefore, the extraction yield was 48%. This means that we pulled out almost half of the caffeine in tea...

Caffeine, Extraction, Gas 906  Words | 5  Pages

Open Document

Isolation of Caffeine from Tea Leaves

Extraction of Caffeine from Lipton® Tea Leaves Nathaniel Camangon*, Kaila Bumagat, Franz Mari Burgos, Remigio Callanta Department of Chemistry, College of Science, University of Santo Tomas, Manila, Philippines Abstract This experiment mainly focuses on the extraction of pure caffeine by multiple extraction from commercially acquired tea leaves and determining its purity by melting point determination. A 0.02% yield of pure caffeine was obtained from 10.4978g of tea leaves (4 tea bags)....

Caffeine, Green tea, Liquid-liquid extraction 1966  Words | 6  Pages

Open Document

Extraction of Caffeine

Extraction of Caffeine from Tea Leaves Jaybee Balilea, Sharmaine Baysic, and Maria Anjelette Patricia Belen 3BIO7, Department of Biology, University of Santo Tomas, Manila, Philippines Abstract Extraction is a technique for isolating and purifying organic substances. In this technique, a solution is combined thoroughly with a second solvent that is immiscible with the first solvent. The solute is extracted from one solvent into the other because it is more soluble in the second solvent...

Caffeine, Distillation, Green tea 1572  Words | 6  Pages

Open Document

Extraction of Caffeine from Tea Leaves

Extraction of caffeine from Lipton tea leaves Maria Gianna Beatrice L. Cancio*, Joe Mari Isabella B. Caringal, Rowena A. Chiang, Patricia Deanne del Valle Department of Biological Sciences, College of Science, University of Santo Tomas, España, Manila, Philippines Abstract Caffeine was extracted from Lipton tea leaves by multiple extraction techniques namely solid to liquid extraction and liquid to liquid extraction; the purification by sublimation and melting point determination. Three...

Caffeine, Liquid, Liquid-liquid extraction 2197  Words | 7  Pages

Open Document

Extraction of Caffeine from Tea Leaves

Abstract: Caffeine, (C8 H10 N4 O2) a white, crystalline alkaloid known as a nervous system stimulant found commonly in tea leaves and coffee, can be extracted using the method of sublimation with the use of Methylene Chloride (CH2Cl2) and Sodium Hydroxide; both can repeatedly rinse the green (unroasted) coffee beans from the caffeine. Keywords: Caffeine, Methylene Chloride, Sodium Hydroxide, Anhydrous Sodium Sulfate I. Introduction Caffeine is an alkaloid of the methylxanthine family. Its chemical...

Caffeine, Coffee, Dichloromethane 1191  Words | 4  Pages

Open Document

Extraction of Caffeine from Tea Leaves

Extraction of Caffeine from Tealeaves Perez, Albert Solomon K.*; Quiambao, Marie Angela C;.Pascua, Hanna Harriette R.; Patricio, Maria Roxanne DC.; 2-Chemistry, Department of Chemistry, College of Science University of Santo Tomas España St., 1015, Manila Abstract Caffeine is soluble in both water and organic solvents, solid-liquid extraction and liquid-liquid extraction were used in the experimentation process. Caffeine was extracted using hot water, however, due to its...

Caffeine, Camellia sinensis, Green tea 1798  Words | 7  Pages

Open Document

caffeine

Evidence Homework #1 Topic: Caffeine Preview: Every morning when I wake up the first thing I do after brushing my teeth is walk straight to the coffee pot. I pour myself a hot rich cup of coffee to start the day off. On my way out the door I grab my go cup and fill it up. When I finally get to school I get myself another cup of coffee. How many miller grams of caffeine do you think I have drank at this point? According to the Mayo Clinic a healthy amount of caffeine for an adult is 200 to 300 miller...

Caffeine, Central nervous system, Coca-Cola 966  Words | 3  Pages

Open Document

caffeine

Julia Sellman Neuroscience and Technology Caffeine In America today, nine out of ten individuals consumed caffeine. They were most likely consuming it within either a cup of coffee, some kind of soda, or the latest energy drink available. The effect of caffeine usually lasts about 2 hours and affects the body in multiple ways. It increases production of acidic juices in the stomach, speeds up heart rate, relaxes muscles found in the lungs to make breathing easier, prepares skeletal muscles for action...

Addiction, Adenosine receptor, Caffeine 1038  Words | 5  Pages

Open Document

Caffeine

Caffeine in the diet Email this page to a friend Bookmark & Share Printer-friendly version Caffeine is a substance that is found in certain plants. It can also be man-made (produced synthetically) and then added to food products. It is a central nervous system stimulant and a diuretic (substance that helps rid your body of fluids). Function Caffeine is absorbed and passes quickly into the brain. It does not collect in the bloodstream or get stored in the body. It leaves the body in...

Caffeine, Coca-Cola, Coffee 1322  Words | 6  Pages

Open Document

Caffeine

Caffeine is a naturally occurring compound found in the leaves and fruits of certain plants. Caffeine is found in coffee, tea, cocoa, cola soft drinks and energy drinks. It may also be found in chocolate bars, energy bars and some over-the-counter medications, like cough syrup and slimming tablets. Caffeine has had a long and rich history; humans have been consuming caffeine since the Stone Age. Early peoples found that chewing the seeds, bark, or leaves of certain plants had the effects of easing...

Caffeine, Coca-Cola, Coffea 938  Words | 3  Pages

Open Document

Caffeine

Introduction A. Attention Getter: If you drink some kind of caffeine on a daily basis or close to that often, please raise your hand. Those you without your hands raised make up a rare percentage of today’s Americans. An article published in the Chicago Tribune on October 19, 2011 by Julie Deardorff, stated that nearly 90% of Americans drink coffee on a regular basis. B. Relevance Statement: When asked if you drank coffee or another source of caffeine regularly, the majority of the class raised their hand...

Caffeine, Chicago Tribune, Coca-Cola 1120  Words | 4  Pages

Open Document

Extraction of Caffeine from Thea Sinensis

Extraction of Caffeine from Thea sinensis Abstract Extraction of Caffeine from Thea sinensis main objective is to isolate, purify characterized caffeine from tea leaves. Sublimation technique was used to get the % yield which is 0.07%. The melting point of the standard caffeine with the sublimate is 229°C. Introduction The active ingredient that makes tea and coffee valuable to humans is caffeine. Caffeine is an alkaloid; a class of naturally occurring compounds containing nitrogen and...

Caffeine, Coffee, Green tea 1695  Words | 6  Pages

Open Document

Isolation of Caffeine from Tea

of Submission: November 28, 2012 Experiment No. 1 ISOLATION OF CAFFEINE FROM TEA I. Introduction Caffeine is a very common substance and is found in coffee, tea, soft drinks, chocolate, and "stay-awake" pills such as Vivarin. It can be synthesized or isolated from natural sources. Caffeine constitutes approximately 4% of tea and coffee leaves, and is also found in cola nuts and cacao beans. Caffeine is a member of the class of compounds organic chemists call alkaloids. Alkaloids...

Caffeine, Distillation, Evaporation 1380  Words | 5  Pages

Open Document

Caffeine Isolation

Isolation of Caffeine in Tea Introduction Today’s world is addicted to coffee and tea for an easy wake up. Both contain caffeine, a drug known for its stimulant properties. Tea, by weight, contains approximately 2-4% caffeine, and the average cup of tea has anywhere from 40 to 120 mg of caffeine (Landgrebe, 327; Mayo Clinic Staff). According to the American Heart Association, caffeine not only stimulates the brain and nervous system, but it releases fatty acids from adipose tissue, and affects...

Aspirin, Caffeine, Camellia sinensis 1429  Words | 4  Pages

Open Document

Extraction of Caffeine from Tea Leaves

Extraction of Caffeine from Tea Leaves Introduction Caffeine is soluble in boiling water and as a result it is easily extracted from tea bags by steeping in hot water. This process leaves behind the water insoluble portions of the tea bag. However, water extracts more than just caffeine, so a final separation is done with an organic solvent that will dissolve primarily caffeine. The organic solvent used in this experiment is Dichloromethane (CH₂Cl₂). Dichloromethane is less polar than water...

Chloroform, Dichloromethane, Diethyl ether 1151  Words | 4  Pages

Open Document

Extraction of Caffeine

Extraction of Caffeine from Tea leaves Casinabe, Antonio Karlo,*Catahay, Jesus Alfonso, Cerdena, O’neil, Cordova, Robelle Department of Biological Sciences, College of Science University of Santo Tomas, España Street, Manila 108 Group 4 2MB Date Submitted: December 13, 2012 ------------------------------------------------- ABSTRACT: The purpose of this experiment is to extract the amount of caffeine present in tea bags. In this experiment, isolation, characterization and purification of caffeine...

Caffeine, Chemistry, Extraction 1896  Words | 7  Pages

Open Document

Extraction of Caffeine from Thea Sinensis

Extraction of Caffeine from Lipton Yellow Label Teal Leaves Arlie Bamiano, Jealine Bernabe, Petrenne Caimbon*, Jhia Caso Department of Biology, University of Santo Tomas Abstract In order to extract pure caffeine from Lipton Yellow Label tea leaves, several extractions and phase transition techniques were employed to 6.5029 grams of sample. Initially, the tea leaves were boiled in water to extract tea from the leaves (Solid-Liquid Extraction). After extracting the tea, several steps of...

Caffeine, Green tea, Laboratory glassware 1592  Words | 7  Pages

Open Document

Caffeine Extraction from Tea Leaves

Extraction of Caffeine from Tea Leaves Marc Tugaoen, Kristine Vanzuela, Rafael Villanueva, Justeen Wong Department of Chemistry, University of Santo Tomas, Manila, Philippines Abstract This experiment has been divided into 4 set-ups, first was the solid-liquid extraction, next was the liquid-liquid extraction, then the sublimation and last was the melting point determination. The solid-liquid and liquid-liquid extraction were both done during the first meeting, the DCM layer was filtered and...

Caffeine, Coffee, Green tea 1390  Words | 5  Pages

Open Document

Extraction of Caffeine from Tea Leaves

EXTRACTION OF CAFFEINE FROM TEA LEAVES ABSTRACT Caffeine extraction from the commercial tea leaves (Lipton Yellow Label Tea) that was done is multiple extraction. 4 tea bags were used in the experiment; tea leaves were weighed having 8.5333 grams. The leaves were boiled in a beaker with 150ml of water; the aqueous tea extract was transferred in a seperatory funnel mixed with DCM (20ml), done thrice. The DCM layer was washed with 20ml 6M NaOH in the seperatory funnel; the organic layer...

Caffeine, Chemistry, Coffee 1109  Words | 5  Pages

Open Document

Isolation of Caffeine from tea leaves

Organic Chem. Lab EXPERIMENT 11: ISOLATION OF CAFFEINE FROM TEA LEAVES COMPOUND PROCEDURE Preparation of Tea Solution: We started out experiment by weighing out 5.023g of tealeaves and 2.008g of calcium carbonate powder. These two substances were mixed with 50ml of water and heated under gentle reflux in a round-bottom flask using a condenser apparatus. The hot solution was then filtered and the filtrate was collected and cooled. Extraction and Drying: ...

Benzene, Caffeine, Distillation 1341  Words | 5  Pages

Open Document

Extraction of Caffeine

Discussion In this experiment, Caffeine was extracted from a commercial tea bag through solid-liquid extraction, and then further purified through sublimation. To begin the extraction, the commercial tea bag containing ~55mg of caffeine was placed in a mixture containing 2.2g of anhydrous sodium carbonate along with 20 ml of D.I. water. The sodium carbonate was placed into the solution to keep the caffeine from becoming slightly acidic(protonated), which would prevent the caffeine from being able to be separated...

Caffeine, Chemistry, Partition coefficient 789  Words | 2  Pages

Open Document

Extraction of Caffeine from Tea Bags

Extraction of caffeine from tea bags ABSTRACT Caffeine extraction from the commercial tea leaves (Lipton Yellow Label Tea) that was done is multiple extraction. 4 tea bags   were used in the experiment; tea leaves were weighed having 8.5333 grams. The leaves were boiled in a beaker with 150ml of water; the aqueous tea extract was transferred in a seperatory funnel mixed with DCM (20ml), done thrice. The DCM layer was washed with 20ml 6M NaOH in the seperatory funnel; the organic layer was dried...

Black tea, Caffeine, Camellia sinensis 2408  Words | 7  Pages

Open Document

Isolation of Caffeine from Coffee

-------------------------------------------------   Isolation of Caffeine from Coffee Date of laboratory work: 10/9/2012 5:00-7:45 Date of report written: 10/15/2012 Introduction: The purpose is to isolate caffeine from coffee by using the organic solvent dichloromethane (CH2Cl2) that is also referred to as direct contact. Calcium carbonate (CaCO3) is used to remove the tannins from the coffee. Afterwards an extraction is used to separate the organic layer (bottom) from...

Caffeine, Chemistry, Distillation 873  Words | 4  Pages

Open Document

Extraction of Caffeine from Tea Leaves

Extraction of Caffeine from Tea Leaves Department of Biological Sciences, College of Science University of Santo Tomas España, Manila, 1028 ABSTRACT: Caffeine is a white crystalline xanthine alkaloid that acts as a stimulant drug. Caffeine is found in varying quantities in the seeds, leaves, and fruit of some plants. It is most commonly consumed by humans in infusions extracted from the seed of the coffee plant and the leaves of the tea bush, as well as from various foods and drinks containing...

Caffeine, Chemistry, Melting point 1526  Words | 5  Pages

Open Document

Caffeine Extraction from Nature's Pride Tea

Weight (g) Tea Leaves 5.5783 Crude Caffeine 0.0246 Empty Beaker 117.5350 Beaker + Crude Caffeine 117.5596 The table above shows the weight of the sample tea leaves, the crude caffeine content in the sample, the empty beaker used in the extraction, and the beaker with the crude caffeine. It is induced from there that for that amount of sample tea leaves, which is equivalent to three bags of Nature’s Pride Tea; there is a 0.0246 g content of crude caffeine for every 3 servings of this tea. ...

Antioxidant, Caffeine, Catechin 831  Words | 4  Pages

Open Document

Caffeine Isoltioan Lab

Chm235LL 2/18/14 Caffeine Isolation Lab I. Abstract Solid crude caffeine was extracted from tea and purified via sublimation. The melting point was experimentally found at 215.9-218.7oC. II. Introduction Caffeine is the most dangerous substance being used in lab this semester, but it’s also one of the most favorite chemicals commonly ingested among college students. The main purpose of this lab was to extract caffeine from a beaker of about 20 ml of tea. Sublimation was an effective and convenient...

Carbon, Carbon dioxide, Carbonate 532  Words | 2  Pages

Open Document

Extraction of Caffeine from Tea Leaves

Extraction of Caffeine from Tea Leaves Santos, Raphael, Samson, Nonia Carla, *Tabora, Brylle, Tan, Kate Michal Department of Biological Sciences, University of Santo Tomas, Manila, Philippines Abstract Tea leaves are natural products that are harvested from agriculture. Caffeine, on the other hand, is a stimulant that has been shown to speed up the time of reaction, increase alertness, and improve one’s concentration. What we did in this experiment was to extract the alkaloid caffeine content from...

Alkaloid, Caffeine, Chemistry 631  Words | 3  Pages

Open Document

Extraction of Caffeine from Tea Leaves

the extraction of caffeine from tea leaves to determine its % caffeine. The extraction process selectively dissolves one or more compounds in a mixture into an appropriate solvent. In this experiment, it was visible in the process wherein the components of the tea leaves were dissolved in two solvents, water and dichloromethane (DCM), with DCM used for multiple extractions. The organic layer was evaporated and the determined % caffeine was 0.12%. Furthermore, the purified caffeine was subjected to...

Black tea, Caffeine, Camellia sinensis 2313  Words | 7  Pages

Open Document

Isolation of caffeine from tea leave

Isolation of caffeine from tea leave Abstract:- Introduction:- Caffeine is probably the most commonly used addictive drug. This drug is found in a number of things ingested by people. It belongs to a group of nitrogen bases called purines. Because caffeine possesses these base-like properties, it is described as an alkaloid. They usually taste bitter and often are physiologically active in humans. The structure of caffeine is shown below. Figure 1: Structure of Caffeine In this experiment...

Caffeine, Chemical substance, Chemistry 699  Words | 2  Pages

Open Document

The Separation and Purification of Organic Compounds

The Separation and Purification of Organic Compounds Sunshine Marie Introduction Each year, many thousands of new or unknown organic compounds are prepared or extracted from natural sources such as plants, fungi and animals. In order to identify an unknown organic compound or the components of a mixture of organic compounds, it is necessary firstly to separate and purify the compounds. At any given temperature, a certain number of molecules of a substance in the liquid state have sufficient...

Chemistry, Distillation, Ethanol 1710  Words | 6  Pages

Open Document

Caffeine

1-1 EXPERIMENT 1 ISOLATION OF CAFFEINE FROM TEA In this experiment you will isolate caffeine from tea leaves and prepare the salicylate derivative. Introduction This experiment illustrates the isolation of a naturally occurring product from plant material -- caffeine from tea leaves. The experiment will provide experience in handling relatively small amounts of material and at the same time you will be exposed to several techniques and procedures which are fundamental for survival in an organic...

Caffeine, Chemistry, Coffee 1680  Words | 9  Pages

Open Document

Water Purification

What is water purification? Water purification generally means freeing water from any kind of impurity it contains, such as contaminants or micro organisms. Water purification is not a very one-sided process; the purification process contains many steps. The steps that need to be progressed depend on the kind of impurities that are found in the water. This can differ very much for different types of water. In which ways is polluted water treated? Settling Before the purification process begins...

Activated carbon, Drinking water, Oxygen 1905  Words | 6  Pages

Open Document

Disadvantage of Caffeine

Computing Caffeine Informative Speech John Cedrick D. Balaguer BSIT 3 English 3 : Speech and Oral Communication Skills 1st Semester S.Y. 2013 – 2014 July 17, 2014 1 of 1 Caffeine has been used widely around the world over centuries, and today it is estimated that 80% of the world’s adult population consumes caffeine in one form or another. What is it about caffeine that has made it so popular? To begin with, one of the first characteristic effects of caffeine is its ability...

Caffeine, Central nervous system, Coffee 989  Words | 4  Pages

Open Document

Caffeine Addiction

 Caffeine Addiction 1,3,7 –trimethylxanthine, also known as caffeine, is considered the most commonly used psychoactive drug in the world (Caffeine). Caffeine stimulates the central nervous system, eases fatigue, increases energy, and improves concentration and focus (Staff). “When purified, caffeine produces an intensely bitter white powder that provides a distinctive taste in soft drinks” (Caffeine). An addiction, is when a person ingests a substance, or engages in an activity that...

Addiction, Caffeine, Coffee 1259  Words | 4  Pages

Open Document

Caffeine Synthesis

Paper Many Americans have included caffeine as a part of their daily diet whether they realize it or not. In fact, “caffeine is the most consumed psychoactive substance in the world” (Ruxton How is this instead (Caffeine is especially common throughout…) 15). It is found very especially commonly throughout every day foods and consumed mostly though through coffee, tea, soda, and chocolate (Spiller 200). Many Americans participate in the use of caffeine; it is estimated that 90% of adults...

Caffeine, Coffee, Drink 1722  Words | 5  Pages

Open Document

Caffeine Study

What is the content difference between energy drinks and coffee and are they safe? There are hundreds of different brands of energy drinks being marketed and their caffeine content per can or bottle ranges from just 50 mg to as much as 505 mg (Weise, 2008). Energy drinks are most commonly consumed by people 11-35 years old (Ballard et al., 2010). Energy drink companies can say anything they want about energy and performance effects of the drinks, and while some energy drinks are banned in some...

Caffeine, Coca-Cola, Coffee 1993  Words | 7  Pages

Open Document

Speech on Caffeine

Title: Caffeine Specific purpose: To inform my audience what exactly caffeine is, where it comes from, the benefits of caffeine and the negative effects of caffeine. Introduction A. Attention material: Do you ever feel like you will never make it through the day without caffeine? Is your first thought in the morning to get yourself a cup of coffee before you can even get your day started? B. Tie to the audience: I am sure that most of you do consume at least one form of...

Brain, Caffeine, Central nervous system 885  Words | 3  Pages

Open Document

Caffeine Analysis

to introduce my self first. My name is David Cho * Caffeine is used to provide a "boost of energy" or a feeling of being more alert. It's often used to stay awake longer and many people feel as though they "cannot function" in the morning without a cup of coffee to provide caffeine and the boost it gives them. 9 in 10 Americans consume some form of caffeine regularly, making it the most popular behavior-altering drug. * Caffeine is a naturally occurring substance. It is part of a group...

Blood sugar, Caffeine, Coca-Cola 884  Words | 3  Pages

Open Document

Extraction of Caffeine from Tea leaves

Isolation, purification and characterization of alkaloid caffeine from tea leaves Date Submitted: September 3, 2014 Abstract Caffeine is one of the main constituents of tea leaves. In this experiment, 0.0039 g of pure caffeine was isolated from tea leaves. This was done through solid-liquid extraction followed by multiple liquid-liquid extraction. Then crude material obtained was then purified by sublimation. The isolated caffeine was subjected to thin layer chromatography (TLC)...

Benzene, Caffeine, Coffee 1976  Words | 5  Pages

Open Document

Informative Caffeine

Caffeine Topic: Caffeine General Purpose: To inform Specific Purpose: At the end of my speech, my audience should understand the beneficial effects of caffeine, the negative effects and discuss what are considered safe levels of caffeine consumption. Thesis Statement: The three areas I will cover in my speech are the beneficial effects of caffeine, the negative effects and discuss what are considered safe levels of caffeine consumption. Introduction Attention-Getter: If you...

Caffeine, Coffee, Effect 824  Words | 3  Pages

Open Document

Protein Purification

Introduction Protein purification is the series of processes to isolate a single type of protein from a complex mixture. This is vital to extract and characterize the protein of interest. However, before doing so, it is important to release the protein from the subcellular organelles. This step is also known as homogenization. This step can be done with the use of blender. As the solution was homogenized, it may undergo saltation or acidation to remove impurities such as calcium anions. Hexane...

Assay, Bicinchoninic acid assay, Bradford protein assay 1222  Words | 5  Pages

Open Document

Extraction of Caffeine

note: A09-010A The quantitative determination of caffeine in beverages and soft drinks using UV wavelength spectroscopy Introduction Caffeine is a naturally occurring alkaloid which is found in the leaves, seeds or fruits of over 63 plants species worldwide. The most common sources of caffeine are coffee, cocoa beans, cola nuts and tea leaves and the worldwide consumption of products derived from these natural materials means that caffeine is one of the most popular and commonly consumed drugs...

Caffeine, Coca-Cola, Coffee 1381  Words | 5  Pages

Open Document

Caffeine as a Teratogen

Teratogenetics: Caffeine as a teratogen Chase Palmer Fremont High School Hansen p.4 Abstract The purpose of this paper is to identify the teratogenetic affects of caffeine in unborn children and breast feeding children. The following topics will be discussed: Risk of congenital anomalies, risk of spontaneous abortion, risk of low birth weight and preterm labor as well as, the critical period of the teratogen, short term and long term affects, and the changing danger of the teratogen relating...

Affect, Breastfeeding, Caffeine 964  Words | 3  Pages

Open Document

Caffeine Speech

Speech Outline Title: Caffeine Specific purpose: To inform my audience about the effects and health issues of caffeine. Thesis: Caffeine can have many different effects on the body depending on the amount of consumption. Introduction A. Attention Getter – How many of you here consider yourself caffeine addicts? How much soda do you drink a day? One bottle? Two cans? More? How about coffee? B. Thesis statement – Caffeine can have many different effects on the body depending on the amount...

Caffeine, Coffee, Diet of Japan 770  Words | 3  Pages

Open Document

water purification

Introduction Water is necessary to life but it can be unhealthy too. In general, the water quality is poor in developing countries like Kenya. Water is a vector of diseases like yellow fever, diarrhea… Water purification is very important in these countries but people don’t have a lot of time to spare, they work or they are in the field and in general women must spend a significant amount of time walking to collect water. So we need to find a quick, easy, and economic solution that is as...

Bacteria, Escherichia coli, Microbiology 2041  Words | 7  Pages

Open Document

CAffeine

The Effects of Caffeine 1 The Effects of Caffeine and Placebo on Computer Typing Skills St. Olaf College May 14, 2009 The Effects of Caffeine 2 Abstract This study examined the effects of caffeinated versus caffeine-free CocaCola and Diet Coke on the speed, accuracy, error and words per minute of typing skills. 30 undergraduate students participated in the experiment for academic credit for an introductory to psychology class. The participants consumed their choice of soda and were...

Caffeine, Clinical trial, Coca-Cola 2800  Words | 13  Pages

Open Document

Caffeine

Caffeine, the stimulant in coffee, has been called “the most widely used psychoactive substance on Earth .” Synder, Daly and Bruns have recently proposed that caffeine affects behavior by countering the activity in the human brain of a naturally occurring chemical called adenosine. Adenosine normally depresses neuron firing in many areas of the brain. It apparently does this by inhibiting the release of neurotransmitters, chemicals that carry nerve impulses from one neuron to the next. ...

Action potential, Brain, Cerebellum 467  Words | 2  Pages

Open Document

Caffeine vs Sleep

Caffeine and Sleep • Sleep Topics Caffeine has been called the most popular drug in the world. It is found naturally in over 60 plants including the coffee bean, tea leaf, kola nut and cacao pod. All over the world people consume caffeine on a daily basis in coffee, tea, cocoa, chocolate, some soft drinks, and some drugs. Because caffeine is a stimulant, most people use it after waking up in the morning or to remain alert during the day. While it is important to note that caffeine cannot...

Alertness, Caffeine, Chocolate 625  Words | 3  Pages

Open Document

Purification of Water

Purification of Water Domestic: Distillation - In the process of distillation water is heated and evaporation takes place, whereby water changes back to water when cooled; this process is called condensation. The condensed water is the purest form of water, free from microbes, and impurities. Boiling - Boiling is the best and simplest method to purify water. After straining the water twice through clean muslin cloth, it is boiled for ten minutes lo kill the microbes present in it and also remove...

Boiling, Condensation, Distillation 1395  Words | 5  Pages

Open Document

Experiment 15 the Purification of Water

Experiment 15 The Purification of Water Date Performed: 9/25/2012 Joe Shmoe Date Submitted: 9/26/2012 Chemistry 1046L-sec07 Lab TA: Blankity Blank Purpose: The purpose of this experiment is to learn about the various processes by which water is processed and treated. This experiment will involve removing chemical impurities in water through using techniques such as absorption spectrophotometry, sample collection, serial dilution, filtration PH and graphical analysis. If this...

Acid, Chemistry, Concentration 1022  Words | 4  Pages

Open Document

Sublimation of Dry Ice in Water

Science Project : Sublimation of Dry Ice in Water Christopher Drake Dana Smith Panut Panusiri Ehsan Subhani Period 4 Honors Chemistry Mr. Mattson Table of Contents Purpose 3 Experimental Questions 4 Preliminary Research ...

Carbon, Carbon dioxide, Dry ice 1864  Words | 7  Pages

Open Document

caffeine and placebo effect

Caffeine and the Placebo Effect Plants produce caffeine as a protective pesticide, paralyzing feeding insects. This powerful substance has been used as a stimulant for centuries. The use of caffeine as an energy booster dates back to the Stone Age through coffee, tea and cocoa. Synonymous with caffeine, coffee has grown into a $70 billion industry with no signs of slowing down. It's a good source of antioxidants, a social atmosphere, and a legal stimulant. Coffee drinkers come back for more because...

Addiction, Alertness, Caffeine 782  Words | 5  Pages

Open Document

A Double-Edged Sword - Caffeine

Caffeine: A double-edged sword Introduction: Nowadays, caffeine is well known as the most popular and widely consumed drug. We can find it from foods and drinks, even many medications contain this substance, it is pervasive in our daily lives. Caffeine is one kind of rapidly absorbed organic compound. It is classified as stimulant witch can increase alertness and energy levels for a short period of time (website). Caffeine can be used as pharmacologic substance as well, for example, it is...

Abortion, Caffeine, Cancer 1430  Words | 5  Pages

Open Document

The Truth About Caffeine 1

The truth about caffeine How many of you here consider yourself caffeine addicts? How much coffee do you drink a day? One cup? Two cups? More? If you crave caffeine to get you through the day, you're not alone. About 68% of Americans say they're hooked on coffee this year, compared with 64% last year, according to the National Coffee Association. But of course, Caffeine and related compounds are found not only in coffee, but also in tea, soft drinks, and chocolate. Most...

Addiction, Caffeine, Camellia sinensis 751  Words | 3  Pages

Open Document

Role of Students in the Purification of the Society.

TOPIC: Role of students in the purification of the society. TABLE OF CONTENTS TOPIC: Role of students in the purification of the society * Purpose of education. * Students and their role in the society. * Current situation of the society. * Students' reformers in the past. * Students' role in the purification of the society. * Conclusion ...

Education, Role, Social network service 1518  Words | 5  Pages

Open Document

The Effect of Caffeine on Body Temperature

Introduction The aim of this experiment was to determine the effect of caffeine on resting body temperature. This has to do with homeostasis, which is the maintenance of equilibrium. In other words, it is a stable body state. Homeostasis refers to the process of keeping the internal body environment in a steady state, when the external environment is changed (Homeostasis 2). Humans are warm-blooded creatures that generate body heat internally and maintain body temperatures at a fairly constant...

Adenosine, Adenosine receptor, Caffeine 1931  Words | 6  Pages

Open Document

Isolation of Caffeine from Tea

Experiment # 1 Isolation of Caffeine from Tea I. Introduction Organic compound can be separated and can be obtained from a mixture of compounds by chemical, physical or mechanical means using the process called Extraction. One or more of the mixture compounds can selectively dissolve into an appropriate solvent in the process of extraction where dissolved compounds is referred to as Extract. The experiment comprises the solid-liquid extraction, the liquid-liquid extraction and distillation...

Chemistry, Ethanol, Evaporation 1248  Words | 5  Pages

Open Document

Caffeine and its effects on the human body

consume caffeine every day of the year. Caffeine is the ingredient that makes the public crave coffee, soda, chocolate and many other caffeine-carrying products. Americans consume about 45 million pounds of caffeine each year. In the United States, coffee drinkers drink an average of 2.6 cups per day. Total caffeine intake for coffee drinkers was 363.5 mg per day - this includes caffeine from coffee and other sources like soft drinks, food and drugs. Non-coffee drinkers get plenty of caffeine as well:...

Caffeine, Coffea, Coffea arabica 1437  Words | 4  Pages

Open Document

Caffeine and Its Effects on Your Brain

Caffeine is a drug that helps people stay awake or alert. It is also known as trimethylxanthine, a naturally occurring chemical stimulant. The formula for caffeine is C8H10N4O2. It shares several traits with famous drugs like amphetamines, cocaine and heroin. It uses the same biochemical mechanisms as these drugs to stimulate brain function. Caffeine has its benefits, but it also has several draw backs. In this paper, we will explore these and come up with an answer to “is it worth it?” Adenosine...

Adenosine triphosphate, Brain, Caffeine 1430  Words | 4  Pages

Open Document

Become a StudyMode Member

Sign Up - It's Free