Chemistry Project Essay Example for Free

Chemistry Project Essay Caffeine is a naturally-occurring stimulant, found in several plants. Caffeine is water soluble, and is extracted into the brewed cup when preparing tea, coffee, or other caffeinated drinks. The most well-known plants containing caffeine are the tea plant, Camellia sinensis, coffee, yerba matà ©, and guayusa. Although tea is known to have a number of health benefits, heavy caffeine use is known to have unpleasant effects and negative impacts on health, including anxiety and insomnia, and for this reason many tea drinkers seek to moderate their caffeine intake. The amount of caffeine in tea tends to be low, but is high enough to be a matter of concern for people drinking large quantities of tea, as well as people sensitive to caffeine for medical reasons. The Caffeine Molecule How much caffeine is in tea? The caffeine content of tea varies widely from one tea to the next, and depends on how the tea is brewed, but tends to be within the range of 15-70mg per 8 ounce cup. Caffeine can also be measured in terms of milligrams of caffeine per grams of dry tea. A teaspoon of dry tea leaves tends to weigh around 2.5 grams, the amount usually used to make a single cup, although this varies greatly by the type of tea. One study of the caffeine content of teas (after steeping) found that the caffeine content of tea varied from about 3 mg/g to 30mg/g, which would result in a cup of tea containing between 7.5 mg and 75 mg of tea. In most cases, tea has much less caffeine than coffee; a typical cup of coffee contains 80-135 mg of caffeine. However, it is important to note that these figures are per cup, not per serving, and in the case of large serving sizes, and also with espresso and other heavily-caffeinated drinks, the caffeine per serving can be considerably higher. In the U.S. the standard small serving size is 12 ounces. A recent study of commercial coffee vendors in Australia found that roughly a quarter of espresso samples contained over 120 mg of caffeine per serving, about 1/8th contained 167 mg or more per serving, and the highest contained 214 mg per serving. The authors of this study concluded that the most often-cited figures on caffeine content of coffee tend to underestimate the actual caffeine content. How much caffeine is safe to consume? To place these figures in perspective, the current consensus of the American Congress of Obstetricians and Gynaecologists is that it is safe for pregnant women to consume up to 200 mg of caffeine daily. For the general public, the Mayo clinic recommends that 200-300 mg of caffeine daily is safe, but that 500-600 mg daily can cause a number of health problems. If drinking a relatively stronger tea containing 60mg / cup, 8 cups a day would be a safe amount, or 3 for pregnant women. For a weaker tea, with 30mg / cup, twice this amount would still be a safe amount of caffeine. Keep in mind that different people react differently to caffeine, so an amount that is safe or unpleasant for one person may not be healthy for everyone. L-theanine in tea interacts with caffeine In addition to caffeine, tea also contains L-theanine; theanine can interact with caffeine, allowing a smaller dose of caffeine to have a stronger effect in terms of boosting concentration and alertness. This may explain why tea seems to provide a stronger boost in alertness for some people than one would expect from its caffeine content alone. Do black, green, or white teas contain more or less caffeine? Many tea companies, and even some reputable entities such as the U.S. Department of Agriculture, have made misleading generalizations about the caffeine content of broad classes of tea. It is a widespread myth that black tea contains more caffeine than green tea, and another myth that white tea contains the least caffeine of all teas. Studies that have actually examined the caffeine content of a large number of different teas have consistently found that caffeine levels vary more among individual teas than across broad categories of tea such as black, white, green, oolong, or pu-erh. A study published in 2005 in the Journal of Food Science listed, among other things, the caffeine content of 77 different teas, and found a broad range of caffeine content among both green and black teas. Surprisingly, the tea in this study that was found to contain the most caffeine was a white tea, solidly dispelling the myth about white teas caffeine content. A more recent study in the 2008 Journal of Analytical Toxicology examined the caffeine contents of a number of teas, and found that they ranged from 14 to 61 mg per 6 or 8 oz serving, with no observable trend in caffeine concentration due to the variety of tea. Very few tea companies have examined the caffeine content of a large number of samples of their teas; one that has, Camellia Sinensis Tea House, found similar results, that the caffeine level varies widely from one tea to the next, and does not show clear trends of caffeine levels across different varieties of teas. One possible exception to this observation is that matcha is known to contain very high levels of caffeine, consistently much higher than other teas. This is due in part to higher caffeine levels in the leaf used to produced matcha, but it is also due to the fact that, because matcha is a powdered tea, the entire tea leaf is consumed when brewing, so a cup of prepared matcha contains 100% of the caffeine in the leaf. What determines the amount of caffeine in a particular tea? Caffeine protects the tender young leaf buds of the tea plant from being eaten by insects. There are so many different factors influencing the caffeine content of tea, that it is very hard to make generalizations predicting the caffeine content of tea. Caffeine levels vary widely from one particular tea to the next. The only certain way to know the caffeine level of a particular tea is to actually test it in a laboratory. Tea can be made from different parts of the tea plant, and these parts contain different quantities of caffeine. Leaf buds (tips) and younger leaves are higher in caffeine than older, mature leaves. This pattern can be explained by the fact that, for the tea plant, caffeine acts a natural insecticide, serving to protect the plant against being eaten by insects. Since the tips and tender young leaves are most vulnerable to insects, these parts of the plant are highest in caffeine; the older leaves are tougher and thus lower in caffeine. Tippy teas such as Yunnan Gold or Silver Needle White Tea (Bai Hao Yinzhen) are thus higher in caffeine than large-leaf teas such as Lapsang Souchong, a black tea (Souchongs are made of mature leaves) or Shou Mei, a white tea. The varietal (cultivar or specific horticultural variety) of tea plant used to produced tea can profoundly affect caffeine levels in tea. Varietal is independent of type of tea (green, white, black, oolong, etc.), and different types of tea can be produced from the same varietal. Variation in caffeine content among different varietals can lead to teas grown under similar conditions, with similar appearance and other qualities, having different caffeine levels. Roasting can also reduce the caffeine levels in tea. In the 2005 study mentioned above, one particular sample of Hojicha, a Japanese roasted green tea, was found to have less caffeine even than some decaffeinated teas. Oolong teas are usually roasted to varying degrees, and can be lower in caffeine, although like all types of tea, oolong teas vary greatly in caffeine content. It should be noted that the roasting processes both for hojicha and oolongs vary greatly, and the caffeine content of most of these teas has not been extensively studied, so it is not safe to conclude that hojicha or roasted oolong is necessarily low in caffeine. The blending of tea with caffeine-free ingredients to produce flavored teas can result in a lower total caffeine content so long as less total tea leaf is used in the blend. Scenting tea with flowers or flavoring tea with essential oils of plants does not add as much weight as blending with loose herbs, and thus does not lower the caffeine content (by weight) of the blend as much. How you brew tea affects caffeine content The quantity of leaf used and the length of time the leaves are steeped both directly influence the caffeine content of the final cup of tea. Using more leaves and steeping for a longer time both increase the caffeine in the resulting cup. Our page on brewing tea has more discussion of how to brew tea. Can you decaffeinate your own tea by steeping it briefly in water? Short answer: no. A number of sources make the claim that you can decaffeinate your own tea by making a brief infusion in hot water, and then discarding this infusion. Unfortunately, this process does not work; if it did, tea companies would not have to resort to expensive and involved decaffeination processes to produce decaf tea. Caffeine tends to diffuse in hot water at the same rate as many of the chemicals responsible for the flavor and aroma of tea, so if the tea still tastes flavorful, it probably still contains caffeine. Most (but not all) herbal teas contain no caffeine Although caffeine does occur in a number of plants, the overwhelming majority of herbal teas are caffeine free. The most notable exception is Yerba mate. Other plants containing caffeine are very rare as ingredients in herbal tea. In addition to exploring other herbal teas, people desiring caffeine-free tea-like drinks might want to try South African rooibos and honeybush, two plants which are often described as being similar to tea in flavor, health benefits, and manner of production.

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GCSE Physics Coursework - Resistance of a Wire Coursework Resistance of a Wire Task To investigate how the resistance of a wire is affected by the length of the wire. Theory What is resistance? Electricity is conducted through a conductor, in this case wire, by means of free electrons. The number of free electrons depends on the material and more free electrons means a better conductor, i.e. it has less resistance. For example, gold has more free electrons than iron and, as a result, it is a better conductor. The free electrons are given energy and as a result move and collide with neighbouring free electrons. This happens across the length of the wire and thus electricity is conducted. Resistance is the result of energy loss as heat. It involves collisions between the free electrons and the fixed particles of the metal, other free electrons and impurities. These collisions convert some of the energy that the free electrons are carrying into heat. How is it measured? The resistance of a length of wire is calculated by measuring the current present in the circuit (in series) and the voltage across the wire (in parallel). These measurements are then applied to this formula: V = I  ´ R where V = Voltage, I = Current and R = Resistance This can be rearranged to: R = V I Ohm’s Law It is also relevant to know of Ohm’s Law, which states that the current through a metallic conductor (e.g. wire) at a constant temperature is proportional to the potential difference (voltage). Therefore V  ¸ I is constant. This means that the resistance of a metallic conductor is constant providing that the temperature also remains constant. Furthermore, the resistance of a metal increases as its temperature increases. This is because at higher temperatures, the particles of the conductor are moving around more quickly, thus increasing the likelihood of collisions with the free electrons. Variables Input: †¢Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Length of wire. * †¢Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Material of wire. †¢Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Width of wire. †¢Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Starting temperature of wire. Output: †¢Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   and thus the resistance of the wire. †  †¢Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Voltage across wire. †¢Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Current in circuit. †¢Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Temperature of wire. The variable marked with a * will be varied, the other input variables will be kept constant. The output variable marked with a †  will be measured. Predictions †¢Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  The longer the wire, the higher the resistance. This is because the longer the wire, the more times the free electrons will collide with other free electrons, the particles making up the metal, and any impurities in the metal.

Chick-Fil-A

Chick-Fil-A is a fast food restaurant based off a religious based principle. Truett Cathy the founder of the company always put his religious beliefs ahead of all things. All Chick-Fil-A's are closed on Sundays so that the employees of the company can attend church (Chick-Fil-A). Truett Cathy opened his own Diner at the age of 25. Truett and his brother Ben opened up the Dwarf Grill in Hapeville, Georgia, a suburban area in Atlanta Georgia, in 1946, after Truett Cathy was discharged from the U.S. Army. The two brothers wanted to build the fast food restaurant near a striving company, which was a Ford Auto plant. Hoping that hungry employees would come and buy, and it worked. Truett and Ben noticed when they were serving the customers, they were taking rolls and chicken, turning them into a sandwich. Giving them and ideal for the concept of Chick-Fil-A. Tragedy Truett's brother Ben and another brother were killed in a plan crash but Truett continued to run the Dwarf House which before was the Dwarf Grill. The Dwarf Grill soon became a franchised throughout the Atlanta area (The balance small business). A Chick-Fil-A manager in Texas decided to post a list of banned words and phrases on Reddit. That list of words went viral. Chick-Fil-A has not responded to that list of banned words yet. Eric the manager at the Texas Chick-Fil-A listed the unacceptable slang workplace phrase because he believes in the command: â€Å"You will speak properly when you walk through these doors† (Suhay). The list of words included: â€Å"cuz,† â€Å"Bae,† â€Å"Bruh,† and other urban terms. Also, on that list was the word â€Å"Ebola† because some of the employees have accused people in the establishment of having the deadly disease while working (Suhay). Gottsman suggest that, â€Å"Slang and business really do not go hand-in-hand† (Suhay). Gottsman, who coaches major corporations and university students made a rare appearance to help a group of teenagers learn proper businesses and interview protocols in preparation for college and scholarship interviews. (Suhay). Gottsman says,† It shouldn't matter that this is a fast food establishment. Employees should be ambassadors of the company they work for† (Suhay). Organization behaviors impacts the success of the company. A company that have motivated, engaged employees with clear goals that aligned with the company's strategy, creates a successful company. Organization behavior can help a company perform well (Managing People and Organizations 8). It is important when working in an establishment, speaking well and clearly to the customers possess as good communication skills. Communication allows us to form connection. Influence decisions and motivate change. Decisions that the leaders make tend to help mold the culture of the company. Making the wrong decisions can have a great impact on the business or organization. Leaders have a responsibility to make the right decisions for everyone involved. Truett created a successful business at Chick-Fil-A's because of a highly effective business model. He created something bigger than himself based on his leadership style. â€Å"They've experienced a more than 10% sales increase almost every year since launching in 1946. Franchisees retention rate has been 96% for nearly 50 years, while the corporate staff retention rate has hovered at 95-97% over the same time period† (Forbes Magazine). Letting your employees know that you are there for them is team building practice. Chick-Fil-A believes that all business leaders can introduce growth and development for their own companies. The company encourages its staff to develop different programs; plans and support them by providing budget necessary class, books, training and conferences to help with team building within the company. Chick-Fil-A is one of the largest privately-owned restaurant chains with 1,450 restaurants in 38 states, with its charitable sponsor of religious and community groups world wide (Vivian). Building trust, mitigating conflicts, encouraging the communities and increasing collaboration is what Chick-Fil-A does. Every single Chick-Fil-A is closed on Sundays; Truett Cathy says, â€Å"Our decision to close on Sundays was a way of honoring God and directing attention [on] things [that are more] important than [the] business† (Vivian). Spending time with family and having time to recover from a hard week of work; helps the moral of the employees to have a common goal, allowing bonding to happen more organically and far more effectively for the company. The successful chain has used it success to commit to education. Earning $25 million dollars in Leadership Scholarships, the company has allocated $1.4 million of that to be awarded to its team members of the fast food chain (Vivian). Team building expands not only to the employee but the customers too. Cow Appreciation Day is a day costumer get to dress up like a cow and receive a free chicken sandwich. The appreciation day is to show their thanks to the loyalty of the customer's. Because of the team building this company haves not only for their employees but for the customers; they have a large and growing base of Chick-Fil-A fans around the world (Vivian). Process gain plays an important role in team building it is part of the performance improvement. That is when people work together and not independent (Management People and Organization 268). Chick-Fil-A is always trying new things with their staff that can generate good vibes among the employees, which benefits the business. Team togetherness builds results for the business long term. Socializing and making friends in the workplace is a great way to increase productivity in the company. Its increases morale in the workplace and a better way of solving everyday workplace issues. When a business provides team building activities together, employees have a better understanding of others weakness, strengths and interest.This helps with better understanding to work together on future progress, which is vital to the company. Chick-Fil-A has build Social Facilitation, this happens when the employees and staff are motivated to look and feel good to others and maintain a positive image (Management People and Organization 269). Chick-Fil-A has established team efficacy, it shares beliefs that can be organized and execute the behaviors in it company (Management People and Organization 269). Improving productivity can be a difficult thing to do in a business. You can not always tell which solutions are right for the company. Trying solutions one at a time can be time consuming and expensive. The best approach is to take steps that are necessary to get your staff and employees on board. One approach Chick-Fil-A will plan to try and that is broaden their appeal to the Millennial market. The Millennials will broaden Chick-Fil-A's national and, ultimately, international growth plans (Horovitz). Chick-Fil-A also plans to replace all of it's current salads and replacing them with an entirely new salad, focusing on fresh ingredients (Horovitz). The company will introduce new wraps and post calorie counts on new menu boards (Horovitz).  This fast food restaurant knows that it needs to be able to look at what is working well and where there is room for improvement. The workers of a business are the ones who are immersed in the production processes on a daily basis, so empowering them on developing ideals for improvement for the company, is always a great thing to do. Workers who feel empowered are more likely to demonstrate increased productivity. Chick-Fil-A has exceptional service, quick service and cleanliness because of the hard workers. Many of the franchisees offer training classes for their employees to earn certificates in managing food, labor cost managing conflicts in restaurants and other areas of expertise with in the company.

Unit 304 Promote Children and Young People’s Positive...

Unit 304 Promote children and young people’s positive behaviour 1.1 Summarise the policies and procedures of the setting relevant to promoting children and young people’s positive behaviour. The policies and procedures of the setting relevant to promoting children’s and young people positive behaviour covers a range of six sectors these are †¢ Behaviour policy †¢ Code of conduct †¢ Rewards and sanctions †¢ Dealing with conflict and inappropriate behaviour †¢ Anti-Bullying †¢ Attendance Behaviour policy A guideline to all staff on how pupil’s behaviour should be managed. It is important that this policy is constantly being applied to ensure full safety of the pupils; this is why all staff must be familiar with this policy.†¦show more content†¦The main policies relating to behaviour will be the behaviour policies but other policies will also have an impact for example the health and safety policies, child protection policies and anti-bullying policies. All adults in school are expected to act as good role models and to behave in a consistent manner. We make sure that good behaviour is recognised and praised as well as praising children for good work, effort and achievement. Recognitions for good behaviour can be any of the following. A smile and a compliment and verbal praise Phone calls home to parents to give praise about how well their child has done. Post cards can be sent home relating to how well their child is doing. Vivo can be given; children can save these up and buy things from our vivo shop like pens pencils chocolate etc. When they save a lot of vivo then can then buy more expensive item like iPods, mobile top-ups and a whole range of different things. Certificates are awarded for student of the week and also for students who have achieved awards for things like sport performing arts and in all other aspects of school work. 1.2 Evaluate how the policies and procedures of the settings support children and young people to: Feel safe Make a positive contribution Develop social and emotional and skills Understand expectations and limits When planning indoor and outdoorShow MoreRelatedUnit 304 Promote Children and Young People’s Positive Behaviour1100 Words   |  5 PagesOutcome 1 1.1 Obtain a copy of your schools behaviour policy and summarise it, write briefly on the main points of the policy including: a) Code of conduct Our policy has high expectations for both staff and pupils, I have highlighted the expectations in my policy attached, see DKB 1 and DKB 2. b) Rewards and sanctions See level 2 c) Dealing with conflict and inappropriate behaviour See level 2 d) Anti bullying We have a detailed policy regarding anti bullying whichRead MorePsychology and Young People Essay1551 Words   |  7 PagesName________________________ Assessment Plan 304 Promote children and young people’s positive behaviour Evidence requirements | Complete() | 1.Signed completed assessment plan (in plastic wallet) | | 2.Review of City and Guilds | | 3.Discussion with Assessor | | 4.Completed assessment form | | 5.Reflective journal | | 6.Checklist signed and completed | | Assessment plan issued date by: | Assessor:Learner: | Date: | | Assessment plan submission plan agreed by: | Assessor:Learner:Read MorePromote Children and Young Peoples Positve Behaviour1470 Words   |  6 PagesTeaching and Learning Unit 304- Promote children and young people’s positive behaviour Written Assignment 1 Assessment Criteria 1.32.13.5 | In this assignment I will be looking to demonstrate my knowledge of three different assessment criteria. Firstly I will be looking to explain the benefits of all staff consistently and fairly applying boundaries and rules for children and young people’s behaviour. I will then look to explain how the application of boundaries and rules for behaviour complies with theRead MoreAdvocacy Core Units 301 304 Learner pac Essay27222 Words   |  109 PagesPack to accompany Core Modules 301 302 303 304 Purpose and Principles of Independent Advocacy Providing Effective Independent Advocacy Support Maintaining the Advocacy Relationship Providing Advocacy to a Range of Different Groups of People  © Kate Mercer Training www.katemercer-training.com 1 Learner Resource Pack  © Kate Mercer Training www.katemercer-training.com 2 Welcome to the learner pack which will support you throughout core units 301-304 which are part of the qualification (7566)Read MoreEthics of Information Communication Technology (Ict)27618 Words   |  111 Pages239 ETHICS OF INFORMATION COMMUNICATION TECHNOLOGY (ICT) Paper prepared by Tengku Mohd T. 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