Detecting starch and sugars in food Essay Example for Free

Detecting starch and sugars in food Essay Aim: To detect the presence of starch and sugars (glucose and fructose) in different food sources. Background: We have many different foods in daily life and many of them contain nutrients like carbonhydrates which are essential to human life. Starch is a polysaccharide, a group of nutrients known as carbonhydrates. Glucose and fructose are monosaccharides, simpler carbonhydrates which are often refered to as sugars. In order to detect the different carbonhydrates content in ranges of food, we used two theories in our experiment. Firstly, starch can react with iodine to create a blue product. Secondly, glucose and fructose are reducing sugars which can be tested by Benedict’s reagent, because the reducing sugars which contain aldehydes group produce red copper(à ¢ ) oxide precipitate when react with Benedict’s reagent. Materials and equipments: 2cm3 of 1% starch solution, 2cm3 of 1% glucose solution, 10 cm3 of 1% iodine solution, 30 cm3 of 1% Benedict’s reagent, small amounts of different type of food (mushrooms, potatoes, bread piece, sweet potatoes, lemon, onion, biscuit, cucumber, tomatoes, peanuts,lettus, tomato sauce, dark green vegetables, milk, cereal), white tile Ten test tubes, test-tube holder, test-tube rack, Nusen burner, Heat-proof mat, safety glasses Procedures: 1. Three drops of 2cm3 of 1% starch solution was placed onto a white tile and three drops of iodine solution was added and observed the solor change. 2. 2cm3 of glucose solution was placed into a test tube and added about five frops of Benedict’s reagent and boiled gently. Observed the color change. 3. Placed small piece of ten foods in ten test tubes and added one drop of water, three drops of 2cm3 of 1% starch to them respectively and orderly. (mushrooms, potatoes, bread piece, sweet potatoes, lemon, onion, biscuit, cucumber, tomatoes, peanuts) Oserved the color change and made records. 4. Placed small pieces of ten foods into ten different test tubes and added one drops of water, five drops of Benedict’s reagent to them in order and respectively. (lemon, lettus, tomato sauce, cucumber, tomato, dark green vegetables, milk, biscuit, cereal, sweet potatoes) And boiled each test tube gently and observed the color change. 5. Made a conclusion based on results. Result 1.In procedure 1, the color of solution changed to blue-black when starch solution reacted with iodine solution. In procedure 2, the color of solution changed to orange-red when the glucose solution reacted with the Benedict’s reagent and was heated. 2.The diagram(fig.1) below shows what I observed directly after the procedure 3 : Food source Color change Mushroom Potatoes Blue-black Bread piece Blue-black Sweet potatoes Purple-blue Lemon Onion Biscuit Blue-black Cucumber Tomatoes Peanuts 3.Then,the diagram(fig.2) below shows what I observed directly after the procedure 4: Food source Color change Lemon Red-orange Lettus Dark purple-red Tomaot sauce Orange Cucumber Red-orange Tomato Orange Dark green vegetable Milk Light orange Biscuit Orange Cereal Orange Sweet potato Red-orange Analysis: 1. In my whole experiment, the procedure 1 and 2 were used as testing thoeries to give us a standard to testify whether certain food source contained certain kinds of carbonhydrates. If in procedure 3 the food turned color near blue or purple, the food must contain starch inside. What’s more, if in procedure 4 the solution in the test tube turned color near red or orange, the food msust contain reducing sugars glucose or fructose. 1. From the information and results I gathered from fig.2, I was able to figure out whether each food contains sugars glucose and fructose or not. The list was shown below(fig.4): From the diagram above we can clearly see that except dark green vegetables all the foods remained contain sugars glucose or fructose. Evaluation: During the experiment, our group made several mistakes and I listed them below to evaluate them respectively. 1. At the beginning of the experiment, during the process of adding water to the washing powder solution to 500cm3. We first ingnored the bubbles above and filled the water till the 500cm3 scale but later on we found the water was much more than 500cm3, so we repeated the experiment from the starting point once again. This time, I controled the water very carefully by pouring it softly along side the walls of the beaker and measuring cylinder to make sure there’s no bubble made during the procedures. My improvement was successful and at the second time we added water accurately to 500cm3. 2. The color of final solution in test tube â€Å"2.5mgdm-3† was as dark as that of the solution with 10mgdm-3and it’s not consistent with the general trend of other solutions. I considered the whole procedure of our experiment thoroughly and thought of two possible errors. Firstly we could have made that firstly we might add more than 5 cm3 standard detergent solution to the test tube. Secondly, because before using the 1000cm3 beaker to heat the test tube we used 500 cm3 beaker at first then we found it too small to hold six test tubes so we removed two test tubes out of the water and then put them into the bigger container. Maybe one of the two previously heated test tube was the â€Å"2.5mgdm-3† one and it’s darker because it has been heated for seconds before others.

Incest Essay -- essays research papers

Incest Incest is one of the most interesting taboos of our time. The definition of incest is a highly controversial topic. Yet, the definition of incest is one of the most important definitions for the people involved, though the law's and psychologists' meanings are not much the same. Incest needs to be similarly defined for the incestuous parties, both by the law and by psychologists. The definition of incest should be determined by the cases of incest. The people who commit incest, and the types of incest should be considered when making this definition for the law. Why incest occurs has a great deal to do with the people and the types of incest. With the definition dissimilar between the law and psychologists, it is very difficult for the involved to do anything about it. The definition is both stated as wrong by law and by most religious morals. According to psychologists, incest is defined as A- any intimate physical contact that is sexually arousing between non-married members of a family." (Justice, pg 25) What this is interpreted as is that sexual intercourse does not need to occur for a situation to be considered incestuous. Stroking, fondling, or even intimately kissing can be considered incest. This is not all true for the law's definition. In Georgia, incest is defined as any sexual intercourse between known relatives, by blood or by marriage, (meaning a step-parent and step-child.) Incest laws basically exist to prohibit marriage or inbreeding between family members, and the sentences are almost never carried out. (Kosof, pg 53) So incest is stated as wrong, but not enforced. The Bible states that incest is wrong, just as the law does. ACursed be he who has relations with his father's wife... Cursed be he who has relations with his sister or half-sister!" (Deu 27:20,22.) Therefore, the definition can be altered to fit the needs of the definer. The different forms of incest are as follows: father-daughter, mother- son, brother-sister, and father-son. Conditions of incest don't always involve intercourse, but still hurt the included. So, the conditions should help to define the firm meaning. "But surely at fourteen, I should have been capable of escaping..." (Armstrong, pg 7) Father-daughter is the most common form of incest. Three-fourths of all reported cases usually involve dad and his oldest daughter. It is usually non-... ...ween mother and father. Mom either denies dad sex, there is a major life crisis, or opportunity knocks. The opportunity for incest occurs when mother is gone all the time and so the daughter assumes the role of the mother. When this happens, there is a need for treatment. This is when the definition of incest is most important. The children are very scared and need confidence. If he/she tells a psychologist or teacher, that person is required by law to tell the authorities. (Kosof, pg 53) When the authorities are contacted, the definition comes into play. The child wants to feel safe, and if their definition of incest doesn't live up to the law's, then the charges could be dropped and the child gets into more problems with incest. Therefore, the background of the incest is very important to the law's definition. By the people involved, the form, and why it occurs are critical to helping the child out when defining the term. The definition of incest by the law should be closer to the definition of psychologists in order to help out the family. AIt is evident that we still know very little about how to treat the sexual offender and the abused child effectively." (Kempe, pg 109)

Analysis of Film Poster for “The Matrix”

From a distance the first thing that would be noticed by a passing audience would be the title of the poster. It would catch the viewer's eye with its striking green colouration and large bold font. Its central position in the poster would draw the audience's attention and bring them closer so they can pick out the smaller information, which in turn would lead to the desire to see the film or not. The use of the upper case makes the title stand out from the rest of the poster and would act as the focal point of the advertisement. The type of font used in this case sharp and modern, would denote the genre of the movie, which again would influence the people and pick out a specific target audience. Director: The directors name on my poster is situated above the title, so presumably would be the next thing the viewer would focus upon. A famous, well-established director such as Spielberg would sell a film by reputation alone. Their previous films using various genre would appeal to a target audience that wouldn't have normally seen the film. Their success widens the target audience and draws in people outside the specified genre, making more money for the producer's etc. Images: Images are probably the most important element of most types of advertisement. The use of images gives a more interesting and less boring way of getting the same message across that text would. Also because people are more susceptible to images and remember them easier, designers use this to inform and sell films by incorporating pictures into the poster. The type of imagery used again highlights a target audience, using their likes and dislikes, to create a demand for the film and make them want to watch it. The fact that my only form of imagery is in text and the use of numbers was done purposely, as I chose to integrate the main theme of the film, which is computers and science fiction, by using what could be described as ‘computer language'. The mystery invoked by this type of imagery would entice viewers into watching the film to understand the relevance of it because they are only given small pieces of information. Also the fact that the images can only really be read from close proximity, would mean that people would have to move closer to see, meaning they have to study the poster harder, which would lead to more information being processed, meaning they will have a better understanding of the movie. Actors/Actresses: The actors and actresses are important in widening the target audience further, their past roles and performances in movies will influence people into viewing the film. Most designers would use the upper case letters to advertise the cast as it stands out and would be more noticeable, they would use a contrasting colour from the back ground and they would position the most famous star on the left of the poster as viewers read from left to right. In my poster Keanu Reeves is the first name to appear on the poster, as he is the most famous. It is important to select cast that will appeal to as wide a target audience as possible, with Reeves and Moss, it does just that. They are both younger actors that would appeal to both sexes with their looks and sexual allure. People relate to stars, they either want to be with them or want to be them. Laurence Fishbourne, however, would attract the older viewers, as he is an older more classical actor, people wouldn't necessarily want to be him or be with him, they would more likely admire him for his acting ability. Critic's Quote: The critic's quote is a significant part in the layout of a film poster as it gives the reader a supposedly unbiast opinion of the film. The critic's quote is filled with hyperbolic language and positive words that would make the movie out to be the best film ever. This would help sell the film as no one would want to see a movie that was given a bad review because people are influenced by success. In my quote I used upper case letters within the sentence because it adds to the hyperbole and it highlights the positive words in the quote. The fact that it is directly under the cast's names was done so that they would read the quote after the cast and work their way down the poster, building an opinion about the film and its view-ability. Who actually gave the quote is important too, as their success as a movie magazine, newspaper etc, would promote the movie and would again target a specific audience, in my case using Empire magazine, a ‘movie buff' type of person. Because the average consumer doesn't really know much about movies, the fact that they are being told by an ‘expert', will influence their decision to pay their money to see the film. Certificate: By putting an age limit on the film you pick out a certain target audience. With having such a certificate as 15 advertised on the poster, you appeal to a younger audience with a ‘disposable income', mainly students and adults that don't have families or money that is spoken for. A certificate is there to give the viewers a rough guess as to its violence content, the language used and to what sort of extent the film has sexually explicit scenes in it. Although by putting an age limit on the movie, it doesn't stop younger or older audience attending. Producers: This element of the film poster can be both beneficial and detrimental to its success as a film poster. By using a producer's quote you attract a target audience by association, people who have seen earlier films will make the connection with its success or with its failure. This is potentially where this piece of information can be harmful. If the viewers make the link with a prior films achievements, this can help with the advertised films selling capability. However, if people make a negative link with the previous film they are less likely to watch it, as they will be put off by the last films performance. Conclusion: Altogether I feel my poster works reasonably well, I think it uses most of the key elements that a film poster has to possess in order to inform and to sell the movie to the public. The colouration is eye catching and modern and I feel I incorporated the main theme and essential taster of the movie within it. However if I was to repeat the exercise again I would change, improve and add a few things. I would have more than one critic's quote to broaden the target audience even further, this would be achieved by maybe having a well known newspaper write a review on it, making the film review be seen by a whole range of people, as more buy newspapers than movie magazines. I would also choose to have an actual image included in the poster, as the text that is the imagery in my poster may not be as memorable as pictures may be. To show the public of this movie's success I would probably decide to have the awards, Oscars etc that the movie had won or been nominated for, as this would attract an audience that wouldn't have normally bothered.

Marijuana Should be Legalized Essays - 1357 Words

This is a topic that has become a bit of concern amongst people in the past few years. Marijuana has been illegal since the early 1900’s, but lately scientists have figured out that there are some uses of marijuana that could benefit people in need, people who are sick of deadly diseases such as aids, multiple sclerosis, and cancer. These are all diseases that are hard for anyone to go through, especially without aid that helps the pain and misery from ceasing. Prohibiting marijuana has just made things worse, by increasing the price of marijuana, the illegal usage, and the money spent on trying to cease its use. Abraham Lincoln once said two quotes about prohibition, â€Å"Prohibition goes beyond the bounds of reason in that it attempts to†¦show more content†¦There are no positive results associated with the use of alcohol and tobacco at all. Could this be an indication that the determining factor in the legalization of marijuana has very little to do with the assumed negative effects? Alcohol is one of the most life-threatening, mind-altering, motor-skill impairing substances in existence. Alcohol abuse destroys a person’s liver and wreaks havoc on the entire body. In many cases, it takes very little alcohol to impair a driver’s ability to operate a vehicle and threaten the lives of other people on the road. It seems to me that alcoholics are a much bigger threat to society than â€Å"pot heads† will ever be, regardless of the legalization of marijuana, yet alcohol is still legal along with the infamous cancer on a stick substance, know as cigarettes (America n Civil Liberties Union). Cigarettes are another readily available substance that yields absolutely no positive effects. Cigarettes not only kill the people who smoke them, but they also kill the people around those who smoke them. They also contribute to the depletion of oxygen from our air. There is only one possible explanation for the fact that these deadly poisons have not been banned. The government is making a fortune on the sales and tax revenues of cigarettes. The tobacco industry clearly values the American dollar more than a human life. How does the government justify the legalization of a deadly drug like tobacco, while at the sameShow MoreRelatedShould Marijuana Be Legalized?849 Words   |  4 Pageswhether marijuana should be legalized. Around 23 states have legalized marijuana for medical and recreational use. In the state of Illinois, medicinal use of marijuana has been passed on April 17, 2013. Since January 2014, patients are able to obtain marijuana with a doctor s recommendation. The new debate is whether marijuana should be legalized for the general public as a recreational drug. Although some believe that marijuana is harmless, and that it has beneficial medicinal uses, marijuana shouldRead MoreShould Marijuana Be Legalized?1715 Words   |  7 PagesMarijuana in Society Cannabis, formally known as marijuana is a drug obtained from the tops, stems and leaves of the hemp plant cannabis. The drug is one of the most commonly used drugs in the world. Only substances like caffeine, nicotine and alcohol are used more (â€Å"Marijuana† 1). In the U. S. where some use it to feel â€Å"high† or get an escape from reality. The drug is referred to in many ways; weed, grass, pot, and or reefer are some common names used to describe the drug (â€Å"Marijuana† 1). Like mostRead MoreShould Marijuana Be Legalized?1489 Words   |  6 Pagescannabis plant or marijuana is intended for use of a psychoactive drug or medicine. It is used for recreational or medical uses. In some religions, marijuana is predominantly used for spiritual purposes. Cannabis is indigenous to central and south Asia. Cannabis has been scientifically proven that you can not die from smoking marijuana. Marijuana should be legalized to help people with medical benefits, econo mic benefits, and criminal benefits. In eight states, marijuana was legalized for recreationalRead MoreShould Marijuana Be Legalized?1245 Words   |  5 PagesMarijuana is a highly debatable topic that is rapidly gaining attention in society today.   Legalizing marijuana can benefit the economy of this nation through the creation of jobs, increased tax revenue, and a decrease in taxpayer money spent on law enforcement.   Ã‚  Many people would outlaw alcohol, cigarettes, fast food, gambling, and tanning beds because of the harmful effects they have on members of a society, but this is the United States of America; the land of the free and we should give peopleRead MoreShould Marijuana Be Legalized?1010 Words   |  5 PagesThe legalization of marijuana became a heated political subject in the last few years. Twenty-one states in America have legalized medical marijuana. Colorado and Washington are the only states where marijuana can be purchased recreationally. Marijuana is the high THC level part of the cannabis plant, which gives users the â€Å"high† feeling. There is ample evidence that supports the argument that marijuana is beneficial. The government should legalize marijuana recreationally for three main reasonsRead MoreShould Marijuana Be Legalized?1350 Words   |  6 Pagespolitics in the past decade would have to be the legalization of marijuana. The sale and production of marijuana have been legalized for medicinal uses in over twenty states and has been legalized for recreational uses in seven states. Despite the ongoing support for marijuana, it has yet to be fully legalized in the federal level due to cultural bias against â€Å"pot† smoking and the focus over its negative effects. However, legalizing marijuana has been proven to decrease the rate of incrimination in AmericaRead MoreShould Marijuana Be Legalized?1231 Words   |  5 Pagesshows the positive benefits of marijuana, it remains illegal under federal law. In recent years, numerous states have defied federal law and legalized marijuana for both recreational and medicinal use. Arizona has legalized marijuana for medical use, but it still remains illegal to use recreationally. This is absurd, as the evidence gathered over the last few decades strongly supports the notion that it is safer than alcohol, a widely available substance. Marijuana being listed as a Schedule I drugRead MoreShould Marijuana Be Legalized? Essay1457 Words   |  6 PagesSHOULD MARIJUANA BE LEGALIZED? Marijuana is a drug that has sparked much controversy over the past decade as to whether or not it should be legalized. People once thought of marijuana as a bad, mind-altering drug which changes a person’s personality which can lead to crime and violence through selling and buying it. In the past, the majority of citizens believed that marijuana is a harmful drug that should be kept off the market and out of the hands of the public. However, a recent study conductedRead MoreShould Marijuana Be Legalized?1596 Words   |  7 Pages But what needs to be known before a user can safely and completely make the decision if trying Marijuana is a good idea? Many do not want the drug to be legalized because they claim that Cannabis is a â€Å"gateway drug†, meaning it will cause people to try harder drugs once their body builds up a resistance to Marijuana, because a stronger drug will be needed to reach a high state. This argument is often falsely related to the medical si de of the debate over legalization. It is claimed that this wouldRead MoreShould Marijuana Be Legalized?985 Words   |  4 PagesLegalize Marijuana Despite what people believe about marijuana, it hasn’t once proved to be the cause of any real issue. It makes you wonder what the reason as to why there is a war on drugs. Why is marijuana the main concern? Since the time that alcohol and tobacco became legal, people wonder why marijuana isn’t legal yet. The fact that marijuana is illegal is mainly caused by the amount of money, jobs, and pride invested in the drug war. Once the government starts anything, they stick to it. At