The Crumbling Taj Essay Example for Free

The Crumbling Taj Essay The reaction rate, however, should decrease as the experiment progresses because as the reaction time increases the number of hydrochloric acid molecules present will decrease as they have been reacted to form water calcium chloride and carbon dioxide. The additional water and calcium chloride present as the experiment progresses should decrease the rate of reaction because of decrease in concentration. This should make a graph of the reaction curved as the reaction rate slows down. Kinetic theory is based on the assumption that chemical reactions take place as a result of reacting particles colliding successfully. Successful collisions need a sufficient amount of energy. Particles that posses more kinetic energy than the activation energy are able to react more successfully. The reacting particles all have different kinetic energies due to collisions hanging their speeds. Maxwell and Boltzmann presented the distribution in kinetic energies for two temperatures (high and low) in graphs called distribution curves on which the areas under the curves past the points called energy barriers represent the number of kinetic energies. The bigger the area under the curve, the greater the number of particles with a certain energy that will promote a chemical reaction. Hotter particles have extra kinetic energy after surmounting the number of collisions in unit time. These collisions are more likely to be successful as there would be more than enough energy for them. Although I will not be looking at the factor of TEMPERATURE, I can extend my investigation and experiment the effects of temperature on the rate of reaction. HYPOTHESIS FOR EXPERIMENT 1 COUNTING BUBBLES Counting bubbles is an experiment which I personally think is not very fair. There may be many mistakes in counting the number of bubbles produced for five continuous minutes and so the experiment would not be accurate. Although this experiment isnt so accurate, I think that the results will still show a trend in the pattern of results. I predict that if the concentration of the HCl is doubled then the experiment will happen twice as fast. HYPOTHESIS FOR EXPERIMENT 2 COLLECTING GAS OVER WATER By putting more particles into the reaction, the chance of them colliding increases and so the rate increases. Concentration is a variable that is continuous and independent. I shall test this variable by observing the rate at which hydrogen gas collects over water against the concentration of hydrochloric acid used with CaCO3. I predict that by doubling the concentration of the acid, the rate of reaction will also double. The higher the concentration, the higher the rate of reaction. HYPOTHESIS FOR EXPERIMENT 3 COLLECTING GAS IN A SYRINGE This experiment is very similar to experiment 2 (collecting gas over water) but this experiment is the most accurate out of the three that I will be carrying out. I predict that I will have a very similar type of results and graphs as in experiment 2. I predict that the graph will have more better and accurate trend lines in the graphs showing a curved line of best fit. The higher you raise the concentration the more the particles will collide therefore corrosion of the marble will occur. Plan for the investigation. I will ensure that the goggles are worn throughout the experiments. Care will be taken not to spill any of the acid. Glass will be handled with care to prevent breakages and cuts. If any sort of accident occurs amends will be made with the help of trained technicians. Large volumes of acid will not be carried around to reduce the risk of a spillage. Containers will be kept well away from edges of the benches. Low molar concentration of hydrochloric acid will be used for safety. FAIR TEST To perform a fair test I will do as follows: In the experiment I will measure each substance accurately. I will carry out the experiment at the same room temperature of 20oc each time. I will wash the conical flask with distilled water after each experiment to make sure that there isnt any solution left over from the previous experiment. I will have to stay alert when counting bubbles and will have to concentrate hard. I will also repeat the test again and take the average of the two results to get an average set of results which will be more reliable. By following my fair testing the results will hopefully come out accurate. I will be alert and take the timings accurately for each of the experiments. METHOD FOR EXPERIMENT 1 COUNTING BUBBLES. This is how I will be carrying out my 1st experiment to find out the rate of reaction between marble and hydrochloric acid: When doing my experiments I will use the same procedure throughout. I will first get the necessary equipment that will be needed and will set it up as show below. I will then get 30ml of 0. 1M hydrochloric acid and will put it into the conical flask. To make sure the volumes of acid and water were right we will measure the volumes of each in a measuring cylinder to be accurate. To make sure the mass of marble chips are right we would measure them on the electronic balance to one decimal place. I will then get 2grams of marble chips (roughly the same size) and I will gently put the marble chips into the solution of hydrochloric acid and will spontaneously close the conical flask with the delivery tube that is attached to a bung at the end. As soon as I close the top of the flask, I will start the stopwatch and I will start counting the bubbles, which will be coming out from the test tube. I will record the number of bubbles produced each minute up to five minutes. The bubbles that will be produced will indicate how much CO2 is being given off by the reaction between CaCO3 and 2HCl. I will carry out this experiment again for Distilled water, 0. 5, 1. 0, 1. 5 and 2 molar to see how the concentration affect the rate of reaction. I will keep the amount of marble chips and hydrochloric acid the same for every test I carry out so it would be fair. At the end I will also carry out this experiment on distilled water so I can compare the two substances. In this experiment I will have to concentrate all the time as I will have to count the bubble for five minutes and will have to make sure that I dont miss out on counting a single bubble. After the experiment is over, I will carry out the experiment again to confirm my results and to make sure that I was counting the bubbles correctly. This picture shows how I am going to set-up my experiment and I am going to count the bubbles that come out of the test tube. METHOD FOR EXPERIMENT 2 COLLECTING MEASURING GAS This is how I will be carrying out my 2nd experiment to find out the rate of reaction between marble and hydrochloric acid: When doing my experiments I will use the same procedure throughout. I will first fill the tub with tap water about half way up and fill the measuring cylinder with water and then turn the measuring cylinder upside down into the tub of water so the cylinder would still be filled with water. By doing this, we will create a slight margin of error because some of the water will be displaced when doing this although it will be very little. Then we will clamp the measuring cylinder in place. We will change the size of the cylinders; however, this will not make the test unfair. We then will put the delivery tube under the cylinder so the air from the experiment could displace the water. To make sure the volumes of acid and water were right we will measure the volumes of each in a measuring cylinder to be accurate. I will then get 30ml of 0. 1M Hydrochloric acid and put it into the conical flask. To make sure the mass of marble chips are right we would measure them on the electronic balance to one decimal place. As soon as we put the Marble chips and the acid in the conical flask and close it with the bung which will be attached to a delivery tube; we will immediately start the stopwatch. We will see how long it takes (In seconds) for the measuring cylinder to fill up with 100cm3 of Carbon Dioxide gas. We will carry this experiment out on a range of different concentrations of Hydrochloric acid. I will be carrying out this experiment on 0. 5M, 1. 0M, 1. 5M and 2. 0M to see how the concentrations affect the rate of reaction. I will also use distilled water to compare it against the hydrochloric acid. After the experiment is over I shall carry out a retest to confirm my results and I will take the average out of the two results. Below it show exactly how the experiment was set up. METHOD FOR EXPERIMENT 3 SYRINGE TEST This is how I will be carrying out my 3rd experiment to find out the rate of reaction between marble and hydrochloric acid: When doing my experiments I will use the same procedure throughout. I will first get the necessary equipment that will be needed and will set it up as show below. In this experiment I will again experiment the time it will take for the syringe to fill up with 100cm3 of Carbon Dioxide gas. Although this experiment will be very similar to Experiment 2, this will be more accurate as the equipment used will be more appropriate. I would assume the results in this test to be very similar to Experiment 2 so I will change the amount of Marble chips and the volume of the Hydrochloric acid to experiment what different it makes. I will used 5 grams of marble chips and 50 cm3 of Hydrochloric acid in this test but will used the same range of concentrations which are, 0. 1M, 0. 5M, 1. 0M, 1. 5M, 2M and will also use distilled water. I will do the same, starting of with 0. 1M Hydrochloric acid and put it into the conical flask. As soon as we put the Marble chips and the acid in the conical flask and close it with the bung which will be attached to a delivery tube; we will immediately start the stopwatch. We will see how long it takes (In seconds) for the measuring cylinder to fill up with 100cm3 of Carbon Dioxide gas. After the experiment is over I shall carry out a retest to confirm my results and I will take the average out of the two results. Table of Results for the method of counting the bubbles. Mass of marble /g Concentration of HCl in 30cm3 / M Time In Mins Bubbles collected Expt. 1 Bubbles collected Expt. 2 Bubbles collected Average Initial temperature / oC 2g Distilled water 1 2 3 4 5u.

Computer Hacking :: essays papers

Computer Hacking Precis of 'Who's reading your E-mail" The article exposes the vulnerability of computer data and of corporations with the popularity of the Internet. The Internet can allow hackers access to any computer in the world, with understated ease. Break-ins can go virtually undetected. Major corporations and government security departments have acknowledged that hacker break-ins are out of control. Some companies are too fearful to join networks because of this. Software programs brought out to deal with the growing problem, such as firewalls, are no longer totally effective. New technology has been developed such as ''Pilot Network Services' (offering supervised Internet access); 'Netranger' (a monitor device used by Pentagon) and 'Encrypton' (software that jumbles messages). The basics of computer security (using difficult passwords, and guarding of data) are not being met in a disturbingly large number of American companies surveyed. A new bill demands that system operators become responsible for security. Hackers can be prosecuted (with subsequent heavy penalties) only if the exposed company has actively shown that it was security conscious. Further more, exposed companies are liable to other companies if their lack of security precautions allowed their computer network to become an opening for other company break-ins. Companies are dis-inclined to report breaches in security as it denotes a poor image and highlights their vulnerability. Clients demand security, and lack of it will send them elsewhere. Billions of dollars annually is spent on protection devices. Others are utilizing the expertise of former convicted hackers to fine tune and update their security features. It is a case of befriending the enemy in order to learn more. These hackers come out of goal with a ready market for their expertise, and great financial rewards. The explosion of the Internet use, and networks around the world have brought with it a need for greater security consciousness amongst its users and systems operation managers. Technology needs to be constantly updated in the war against the ever-growing insidious and malicious hacker. Precis of 'Hackers: Taking a byte out of computer crime' by W. Roush. Roush discusses the changing face of computer crime with the advent of the modem and stricter laws. The article touches on the effect these changes are having on hackers themselves, and the measures that are put in place to deal with the problem. It also explores the common ground which hackers and computer security experts agree on. In the 1960's the dictionary definition of a hacker was that of a "computer virtuoso". Hackers comprised of young, computer literate and rebellious gangs vying for the status symbol image and thrill of breaking into a computer network. This all changed with the popularity of the modem and an increasing

Proverbs for Cultivation of Minds Essay

Proverbs have been used in various cultures around the world: Chinese; English; and African are among the most common. According to Chinua Achebe in the book â€Å"Things Fall Apart†, African proverbs are described by the Igbo people as †the palm oil with which words are eaten.† In this culture, palm oil is a symbol of tradition and is commonly served at respected greetings and special events. When relating palm oil to proverbs, it shows that they too symbolize the same traditions and used for special circumstance to speak with great importance. Throughout â€Å"Things Fall Apart† various proverbs are used to teach the cause and effect of decisions, warn against certain events, and poetic words to find meaning. These types of proverbs are the most traditional and prominent ways of teaching in the Ibo culture. Another prominent way in the Igbo culture is trying to obtain a high rank. So, proverbs are used to explain what actions to execute to obtain such a thing.The saying ‘if a child washes his hands he could eat with kings,’ is an example of how Igbo culture uses proverbs to teach the culture the result of different ways of life. It does this by illustrating the privilege one can obtain when he surrounds himself with wealthy, wise, or dominant people in the culture, and mimicking mannerism they have. The cause, washing one’s hands, is following the mannerisms of the higher ranked individuals;the effect, eating with kings, is getting the privilege to be with those individuals. The book backs up its claim with the proverb ‘A man who pays respect to  the great paves the way for his own greatness.’ However, it is not always positive things that come of situations. It is thought to be one of the wisest things, in Igbo culture, to use a proverb as a warning. These proverbs state not only not to do something, but to ponder the results of doing whatever action that may be. In chapter eleven, the proverb ‘A man who makes trouble for others is also making trouble for himself,’ gives a clear example of a proverb saying ‘don’t make trouble for others,’ but also ‘the effect of that is one that is wanted.’ These proverbs tend to be very simplistic because they are intended to make  a person think about their actions, not the words or meaning of the proverb. Another example of a warning proverb is in chapter fifteen that states: ‘Never kill a man who says nothing.’ Proverbs used in this way have no need for a logical timeline of events or deep explanation because the words mean exactly what’s intended. Not all proverbs are clear in their meaning, however. These proverbs tend to be more poetic and metaphorical. All people learn in different ways, no matter what the culture. Some learn best by experience. Metaphorical proverbs are intended to use common scenarios to form general conclusions about life around them. The proverb ‘When a mother-cow is chewing grass its young ones watch its mouth,’ uses the commonality and understanding of a calf watching its mother eat, to explain that children often follow in the footsteps of their mother. The proverb does not state those words specifically, but when read, connections to watching one’s own mother do tasks, comes to mind. Proverbs that are more poetic can have similar meanings to other types of proverbs, just in a more creative way. Proverbs can be used to show cause and effect by stating direct result, can be used to  warn and provoke thought for certain actions, or be used metaphorically to encourage deeper meaning to an everyday situation. For these different reasons, proverbs are one of the most effective ways of teaching in the Igbo culture because each kind of proverb is explained various ways and supports different kinds of thinking. It is the result of the thinking that creates wisdom, wisdom that creates understanding, and understanding that makes a culture continue to grow in learn as time goes on; just like the Igbo culture.

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