Surface area of calcium carbonate Essay Example

Surface area of calcium carbonate Essay Example Surface area of calcium carbonate Paper Surface area of calcium carbonate Paper Introduction: The experiment taking place is between calcium carbonate [CaCO3] and hydrochloric acid [HCl]. Calcium carbonate, also known as marble, is a metamorphic rock. This is a rock that is formed over long periods of time under high temperature and pressure. It is also formed when carbon dioxide reacts with calcium hydroxide to produce calcium carbonate. Calcium hydroxide + carbon dioxide calcium carbonate + Water Ca(OH)2(aq) + CO2(g) CaCO3(s) H2O(l) When an acid reacts with a carbonate the products are salt, water and carbon dioxide gas. When hydrochloric acid reacts with calcium carbonate the products are calcium chloride, water, and carbon dioxide. The formula for this reaction is: Hydrochloric acid + Calcium carbonate Calcium chloride + Water + Carbon dioxide HCl(aq) + CaCO3(s) CaCl2(aq) + H2O(l) CO2 As you can see above, in the reaction, the reactants are hydrochloric acid and calcium carbonate, and the products are calcium chloride, a salt, water and carbon dioxide. The speed at which the reactants will create the products is called the rate of reaction. This follows a theory called the kinetic theory. This theory states that all states of matter contain particles, which are constantly moving/vibrating [kinetic energy]. In solids the particles are positioned close together which allows them to vibrate slightly. Between them are strong bonds that hold them together in a fixed place. The particles present in liquid have further distance between them; therefore the forces of attraction are less than in solids. The particles have weaker bonds that allow them to move. The particles in a gas are much further apart than in a solid or liquid, and have very weak bonds that allow them to move quite freely. There are virtually nil forces of attraction between the gas particles. This therefore means that solids would have the slowest rate of reactivity, liquids would me in the middle, and gasses would have the fastest rates of reaction. The factors that would affect the rate of reaction would be: Concentration of hydrochloric acid. The higher the concentration of the acid the faster the rate of reaction will be. This is because there would be more particles of hydrochloric acid present in the reaction; therefore there would be more collisions, which would therefore results in a faster rate of reaction. The following diagram can show this overleaf: As you can see, in the low concentration of hydrochloric acid, there are 5 particles present, compared to 8 particles of calcium carbonate. In the higher concentration however, there are 10 particles of hydrochloric acid present, and the same amount of calcium carbonate particles present. This should therefore double the rate at which carbon dioxide is produced as there is now double the amount of collisions occurring. Catalyst catalysts are useful in a reaction as it speeds up the rate of reaction without being used up. Most catalysts are there to speed up the rate of reaction, however some can slow them down. The ones that speed up the rate of reaction are called activators, and those that slow down the rate of reaction are called inhibitors. For example, in the reaction where the enzyme (biological catalyst) breaks down hydrogen peroxide (H2O2) into water (H2O2) and oxygen (O2), glycerine is sometimes added, this is in order to slow down the rate at which hydrogen peroxide is broken down during storage. Most of the catalysts that are used are transition metals and their compounds, such as the making of margarine, where a nickel catalyst is used. The nickel catalyses an addition reaction, between a double bonded hydrocarbon (alkenes), the oil, and hydrogen. The result is a solid fatty product, which is margarine. By controlling the rate of reaction (i. e. how much catalyst is used) you can also control the solidity of the margarine. A catalyst allows a substance to react more easily by reducing the activation energy. This is where the energy needed in order to break the bonds is reduced. Therefore the particles require less energy to react, and the reaction occurs faster. Catalysts can be compared to getting from a-b in a car. The normal way would be by going through small roads, however using the motorway is like using a catalyst. This is as it takes less energy (petrol) to get there as well as far less time than compared to taking the smaller roads. Temperature when particle collide with each other, they do not always react. This is, as they do not have the sufficient kinetic energy for them in order to stretch or beak the bonds in order to form the products. In some reactions, only the particles with high energy can react. This sort of situation can be compared to a car crash; if two cars hit each other at low speeds, then hardly any damage will be done, however, if the cars hit each other at a higher speed, then a lot more damage would be done to both cars. Mass of calcium carbonate chips when you increase the mass of the chips, it means that there are more particles present for the hydrochloric acid to collide with. This would cause more collisions, which means a faster rate of reaction. Surface area of calcium carbonate chips in a reaction; if one of the reactants is a solid then the surface area of the solid will affect the rate of reaction. This is because the only particles that can collide with each other are the ones at the solid-liquid interface. This is the area in which the surfaces of the marble chips come in contact with the hydrochloric acid. This would therefore mean that the larger the surface area of the marble chips, the more collisions there would be, which a higher rate of reaction is. Diagram A and B are marble chips with the same masses. Diagram be has a higher surface area, and as you can see, there are more marble particles exposed to the surrounding, which would mean that there would be a larger amount of collisions in a given amount of time.

The Amount of Hours Required to Pass the Bar Exam

The Amount of Hours Required to Pass the Bar Exam When you sit down to study for the bar exam, it is likely you will get a bunch of feedback from other law students and friends as to how much you are supposed to study for the exam.  I have heard it all! When I was studying for the bar exam, I remember people proudly claiming they were studying twelve hours a day, leaving the library only because it closed. I remember folks being shocked when I told them I was taking Sundays off. How was that possible? There was no way I was going to pass! Shocking news: I passed- only studying until about 6:30 p.m. in the evenings and taking Sundays off. How much you need to study for the bar exam is a critical question. I have seen people understudy and fail, for sure. But I have also seen people over-study for the exam. I know, hard to believe, right? Over-Studying and Burnout Can Cause You as Many Problems as Under-Studying When you over-study for the bar exam, you are likely going to burn out quickly. You need adequate time to rest and recover when you are studying for the bar. Studying every waking hour of every day is going to lead you down the road of not being able to focus, being overly exhausted, and just not being a productive studier. For most of us, we cannot productively study that many hours a day. We need breaks to rest and rejuvenate ourselves. We need to get away from the desk and the computer and move our bodies. We need to eat healthy food. These things all help us do better on the bar exam, but they can’t be done if you are studying twenty-four hours a day, seven days a week (okay, I know that is an exaggeration, but you get what I mean). So How Do You Know How Much to Study? Perhaps it is easy to tell if you might be over-studying, but how can you tell if you are studying enough? This is a very personal decision, one that takes a lot of reflection on the process. I think a good first parameter is that you need to study about 40 to 50 hours a week. Treat the bar exam like a full-time job. Now that means you need to actually study 40 to 50 hours a week. That doesn’t count hours that you are chatting with friends in the library or driving to and from campus. If you aren’t sure what 40 to 50 hours a week of work really feels like, try tracking your time (since you will have to do that at your future law job anyway!). What you may find when you do this exercise is that you aren’t actually studying as many hours as you thought you were. That doesn’t mean you add more study hours; that means that you need to be more efficient with your study time. How can you maximize the number of hours you are on campus working? And how can you maintain focus during those hours? These are all critical questions to get the most out of your days. What If I Can Only Study Part Time? How Many Hours Do I Need to Study Then? Studying part time is a challenge, but it can be done. I encourage anyone studying part time to study at least 20 hours a week and study for a longer preparation period than the typical bar prep cycle. If you are studying for the bar for the first time, you may need to think carefully about making enough time to review the substantive law and also to practice. You may find yourself eating up all of your limited study time by just listening to lectures. But unless you are an auditory learner, listening to lectures isn’t going to get you very far, unfortunately. So be smart about which lectures you listen to (just the ones you think will be most helpful). If you are a repeat taker, best to leave those video lectures alone when you have only limited time to study. Instead, focus on active learning of the law and practice. It is possible that not knowing enough law was the reason you failed, but it is also likely that you failed because you didn’t practice enough or didn’t know how to execute the bar questions in the best possible way. Figure out what went wrong and then develop a study plan that will allow you to get the most out of your study time. Remember that it isn’t really about how much you study, but the quality of the study time you put in.

Paganism and New Ageism Essay Example | Topics and Well Written Essays - 3500 words

Paganism and New Ageism - Essay Example As the discussion highlights Paganism encourages worship of godheads that are similar to the medieval Pagan godheads that thrived in an age of anarchy, and the New Age movement presents a complex mix of occult, science, belief in extraterritorial beings that exist in a different plane and â€Å"Enlightened Masters† to resemble Gnosticism. This essay argues that it is best to avoid the Pagan and New Age religiosities because they present a potential for even greater anarchy than is apparent in a world that predominantly subscribes to the monotheistic doctrines.This paper declares that  over the past decades, North America and the Western World have witnessed a substantial increase in the number and diversity of New Religious Movements and new forms of religious life. This is probably because of the fact that with the emergence of a new world, religion must now adapt to new realities. Now, religion is a private matter; more of a matter of choice than it used to be, and religio n must now cope with advanced capitalism. Information is now far more readily available for the masses with the freedom to question and to think.  God who deliberately divided His people into followers of Judaism, Christianity and Islam tolerate the slaughter and the butchery that are the result of His messages to humanity?  Are any of the three of those that presented messages about monotheism imposters and Satanists?... Information is now far more readily available for the masses with the freedom to question and to think. According to Partridge (2006), notions of wellbeing are now important for spiritual health and individuals search for that which satisfies them most in their interaction with the world around them. The reality associated with suffering in a world in which God, an omnipotent being, the all-powerful and the all-knowing Creator, should and could have prevented despair creates a certain lack of satisfaction with the established religious doctrine, especially the monotheistic religious doctrine (Davy, 1997, pp. 1 – 20). After all, how could a merciful monotheistic God who deliberately divided His people into followers of Judaism, Christianity and Islam tolerate the slaughter and the butchery that are the result of His messages to humanity? Are any of the three of those that presented messages about monotheism imposters and Satanists? How can one believe in the truth of events tha t unfolded many thousands of years ago? Why is it impossible for this God, who has the power to create, to maintain all of His creations in dignity and satisfaction in a world that He created and if there is an omnipotent God, why does he delight in the slaughter and destruction of His creation? Many questions and doubts haunt many followers of the three monotheist religious doctrines and the history of monotheism spread over many thousands of years presents many flaws, contradictions, abhorrent notions and notions that defy logic. A study of Armstrong (2011), Stark (2003), Bianchi (1975) and Paterson (2004) lends some support to the previously mentioned doubts. Davy (1997) suggests that a failure to remain satisfied by the notion