Rates Of reaction Essay Example for Free

Rates Of reaction Essay During this experiment I will be investigating if heating limestone and changing the concentration of the acid will affect the rate of reaction. Preliminary work Before doing our main experiment, we will have to conduct another experiment, to see what concentration of acid we will have to use. We done this using 0.1M, 0.5M and 1M of Hydrochloric acid, and 0.1g of powdered limestone, we used powdered limestone, as it would be a fairer test, I think this as all the particles of limestone will be roughly the same size, the particles have a larger surface area than cubed limestone, therefore it will react the quickest. If you were to use cubed limestone it wouldnt be fair as no cube will be exactly the same size. In conclusion to this experiment, 0.5M of acid was the best to use as it had the best measurable reaction time. Equipment The equipment we will be using during this experiment is: *Goggles (to protect the eyes from reactions) *Measuring cylinder (to measure out the acid) *Bunsen burner (to heat the acid to the right temperature) *Test tubes (to hold first experiment in) *Hydrochloric acid (the acid being used) *Powdered limestone (the substance being used) *Triangular stand (to hold the Bunsen burner) *Timer (to time the reaction) *Thermometer (to record the temperature) Diagram Possible Variables The possible variables are: *Temperature of acid- this will determine how quickly the reaction happens e.g. the limestone reacts faster or slower under a certain temperature. When the acid is heated, the particles gain *Amount of Hydrochloric acid used *Amount of limestone used *Surface area of limestone- this will determine how quickly the reaction will happen e.g. If the limestone is cubed or powdered *Concentration of acid- this will determine whether the limestone dissolves faster or slower. Input variable The variable we have decided to change is the temperature as the question we are investigating is whether changing the temperature of the acid will affect the rate of reaction. Input constants During the experiment we will be keeping the amount of hydrochloric acid and limestone used the same because if we use different amounts for each temperature it wont be a fair test, and we wont get the correct results we  are wanting. We will also keep our apparatus the same e.g. the glass beakers, this is because if we have for example a 10cm wide beaker and a 15cm beaker and we use the same amount of acid and limestone, the results will be different as both mixtures have a either larger or smaller space to react in. Output variables During the experiment we will be recording the temperature at the beginning and end of each recording, the time taken for each recording, this will be repeated 3 times (the time taken), and the averages will be calculated for both the time taken and the temperature at the end of each reading. Method *Firstly I will set up my equipment, shown in my diagram on the previous page; I will then tie my hair back and put on the safety goggles to prevent myself from danger. I will then draw a table to record my results on. *I will check to see if anything is around that is able to set alight before lighting the Bunsen burner. When it is alight I will place the glass beaker on top of the wire rack containing the acid and thermometer *When the acid has heated to 20 degrees I will remove the beaker and put the powdered limestone in immediately, as soon as the limestone is in the beaker I will start the timer, when the reaction has finished I will stop the timer and write down the result onto the table. I will then take the temperature of the acid; this will be the reading of the temperature at end. I will repeat this, another two times to make sure its a fair test. *After the first temperature has been completed I will then do the 30 degrees reading, using the same method as above * After the second temperature has been completed I will then do the 40  degrees reading, using the same method as above * After the third temperature has been completed I will then do the 50 degrees reading, using the same method as above *Lastly I will do the 60 degrees reading, using the same method as above. Its important to repeat the experiment a number of times to make sure its a fair test, the more times you repeat it, the fairer the test is going to be. Another way for the test to be fair is to keep all the variables you will not be changing, the same. For example; to keep the amount of acid and limestone used the same. Prediction In this experiment, the theory involved is the collision theory .It is the theory that when the particles get heated, they gain energy, bounce off of each other more often, causing a faster reaction. In this investigation I will be investigating If heating the acid affects the rate of reaction. Results Temp at start (c) temp at end (c) Average temp (c) Reaction time (s) time 2 (s) time 3(s) Average time (s)

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Test without Torture Remember that pig or frog you dissected in the 8th grade? You were probably either completely fascinated by it, extremely repulsed, or just indifferent. Nevertheless, the point was to help you learn about the scientific method as well as getting a hands-on experience in learning about a topic. Dissecting an animal was supposed to help the students with discovering information on their own. However, if this lab is done every year at hundreds of schools, the amount of wasted and discarded animals can add up to millions all for a middle school experiment. In a way, scientists approach the matter of testing on animals in a similar method. It allows for the discovery of new information to help humans progress in life. The subject of animal testing is a controversial topic that is deeply divided among the ethics and practicality of the practice. Scientists generally favor animal testing because it allows for the advancement in medicines and treatments, while animal rights activists question the ethics of testing on animals. When we are sick, we take antibiotics in hopes of getting better. However, there must be a way to ensure that the antibiotic is safe to take in the first place. Health is always an issue and is not about to go away any time soon. It affects not only the human population, but the entire world as well. New diseases and conditions are constantly appearing and in return, doctors and scientists must find a way to counteract these illnesses. Is testing on animals worth the discovery of a new treatment or medication? Without the use of animals for research, we may not have the luxury of vaccines, organ transplants, antiseptic surgery, or treatment for diseases. On the other hand, there is also the aspe... ...ates are inevitable. Is it ever okay for animals to suffer? Would you ever wish excruciating physical pain even on your worst enemy? If your answer is no, then why do we to it to innocent animals? With the new advancements in technology, it is unnecessary to continue exploiting animals in experiments. Computer programs have developed more accurate results on the effect of products on humans than animals have. While millions of animals must be used every year to test a single chemical, updated technology completely eliminates the need for animal testing. This is much more practical economy-wise as well as morally so. We as humans have a duty to preserve the rights of animals and come to the rescue when they are violated. Although the transformation from using live animals to digital computers may be lengthy, taking action is still progressing in the right direction.

Fashion marketing Essay

Fashion marketing over the years has changed considerably. This has been due to number reasons which include culture, lifestyles, technology and the media. A case student of a student will be used. Culture is a link between â€Å"three components: what people think, what they do, and the  material products they produce† but also has the property of â€Å"shaping behaviour and  consciousness within a human society†Ã‚   (Hofstede, 2001) Fashion marketing and culture are closely linked.  People who are members of the same culture, most of the times have an unwritten code  between them for many sectors of their life – social and private. Eskimos are a great example  of such â€Å"unusual habits†, which offer their wife to their visitor during the first night and they  simply mean â€Å"Thank you† with this gesture. Moreover, people around the world use different  movements of their face, hands and body to express their feelings and a foreign student might  feel embarrassed, annoyed or shocked when encounters incidents like the one mentioned  above or ones that are totally new and beyond his expectations. Read more: Fashion essay A Student may face  difficulties to adapt to the climate of the new country as well, which might be too warm or  too cold for the standards of his home town. Additionally, the food most probably will be  different and this may make him feel sick or enthusiast about this. The most important aspect  of a foreign student’s life will be the educational system and fashion, which may differ from  the relationship between teacher and student, to the way the courses are being taught and  gaining employment in the fashion industry due to different cultural norms and values. The  general   rule of thumb at this point is that, after a period of time, â€Å"the culture abroad may  now come the ‘normal’ way of living† . The feelings, that have arisen from this whole  situation of encountering a new culture, are distinctly different to what had been witnessed in  Bulgaria. The most efficient way for a foreigner, student or traveller, before come into  contact with another culture is to be prepared about the variation among cultures and fashion  trends. One must notice that if a stranger meets another culture, but put aside any egoistic  feelings that might have, which do not let him understand the different lifestyles among  people, will only gain from this interaction. Nowadays, that many countries become multi-  cultural, it is important for the locals and the foreigners to try cooperating with each other in  order both of them to live smoothly together. (Hofstede, 2001) The term â€Å"fashion† holistically covers a plethora of different trends and styles. It has been  observed in the UK that many people dress to impress and others dress for attention purposes.  Youngsters in the UK are becoming more and more fashionable and are becoming conscious  of new trends and styles. People in the UK always strive to look their best which is  painstakingly different to what it is like in Bulgaria where they seem reasonably content with  whatever they wear. Whether people in the UK dress smartly, wearing the latest designer  labels that cost a fortune or whether they wear black Gothic clothes and cover their faces in  thick make up, they take pride in their appearance which seems like a cultural norm in the  UK.   (Connor, 1997)

What Is Defending The Holy Land - 1095 Words

Defending the Holy Land Israel’s Iron Doom missile defense system has made making peace with its neighbors outdated. Israel has created a hi-tech weapon system with the support of the United States, that has saved many lives and property damage, but at the strategic level, the invention also causes damage by allowing Israelis to pump up their sense of victimhood. This allows the Israeli government to achieve limited military operation. The Iron Dome will not return peace to the residents of southern Israel, nor the Palestinians in the Gaza Strip and the West Bank. Israel is the very embodiment of Jewish continuity: It is the only nation on earth that inhabits the same land, bears the same name, speaks the same language, and†¦show more content†¦It would be the world’s only dual mission system, which operates in all weather conditions, including low clouds, rain, dust storms, or fog. It provides an effective defense solution for countering rockets, artillery and mortars as well as aircraft, helicopters, unmanned aerial vehicle (UAVs) and precision guided missile (PGMs). It took less than four years to develop the Iron Dome system from an idea to the drawing board to combat readiness. The Iron Doom can handle several threats simultaneously, proficiently and only intercepts incoming rockets when it is considered a serious threat and also can distinguish and intercept rockets and artillery shells headed for population centers within a 43.4-mile range. (Press, 2014) The cost of launching a missile from the Iron Dome at a threat ening rocket has been reported to cost anywhere from $20,000 to $100,000. (Press, 2014) Rockets fired at Israel cost between a few hundred to a few thousand dollars. In 2010, the US government, with the Obama administration backing, contributed $205 million toward its development. 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