Tuesday, March 17, 2020
Science Investigation (Chemistry) Rate of Reaction Essay Example Science Investigation (Chemistry) Rate of Reaction Essay Science Investigation (Chemistry) Rate of Reaction Essay Outline: I will investigate the relationship between the rate of a reaction and the amount of catalyst added to the reaction. I will use hydrogen peroxide and speed pu the decomposition of it by adding manganese(IV), MnO2 as catalyst.Fair test:In order to maintain fair test conditions I will control variables that will affect the rate of reaction.The factors that are able to affect the rate of reaction include:* Temperature* Surface Area* Concentration* CatalystSince I am investigating the relationship between rate of reaction and catalysts, the other 3 factors will remain constant throughout the experiment.Temperature: At higher temperatures, the faster moving particles have more kinetic energy. This means they are moving quicker and will collide more often and with more energy, causing an increase in the number of effective collisions.Surface Area: If more surface area is available, the number of particles of the solid reactant available for collision will increase. However, I am d ealing with hydrogen peroxide (liquid) then there isnt a surface area for me to control.Concentration: More concentrated solutions contain more particles in the same space, making them more likely to collide. The increase in the number of collisions with sufficient energy increases the rate of reaction.These explain why I would need to control those factors because they would affect my results dramatically. I will keep them constant:Temperature: room temperature, temperature of hydrogen peroxide (17.C)Surface area: n/aConcentration: 5 volumes (halved the maximum which is 10 volumes, ratio 1:1)However, for room temperature, I will do all experiments in the same room hopefully the temperature remains constant in that one room.Safety:Whilst this experiment is relatively safe, there are still safety considerations that must be adhered to:* Due to the dangerous nature of many of the compounds involved in this experiment, it is important that safety goggles or safety glasses are worn duri ng all tests.* It is equally important to avoid skin contact with the compounds, as some are irritants. This can be done by ensuring that a suitable method is followed precisely so that there are no unexpected events that would lead to skin contact.Accuracy and Reliability:I will take 3 measurements of oxygen produced at each reading I will take. I will then use the arithmetic mean of these measurements in my analysis to calculate average rate of reaction. This should help to minimize unreliable results. Whilst I am doing my experiment, I will note the results down on a table, in order to spot any obvious anomalies.The measurements themselves will be taken as carefully as possible. Time will be measured using the stop-watch (precise to Ã ¯Ã ¿Ã ½0.1 second), volume of gas produced with the gas syringe (precise to Ã ¯Ã ¿Ã ½1 cmÃ ¯Ã ¿Ã ½), the mass of the powdered manganese oxide with measuring balance (precise to Ã ¯Ã ¿Ã ½0.01g) and the volume of hydrogen peroxide with a m easuring cylinder (precise to Ã ¯Ã ¿Ã ½0.5ml)Prediction:I predict that the grater the amount of manganese oxide, MnO2, is added to the solution, the greater the rate of reaction decomposition.The formula for this decomposition is:H2O2 (aq) =; 2H2O (l) + O2 (g)Hydrogen peroxide =; Water + OxygenThe manganese dioxide is present to be acted as a catalyst and as with all catalysts would lower the activation energy required in order for this reaction to take place. In doing so, the rate of reaction will be increased. Since more catalyst is present, it means there are more surface area of the catalyst so more molecules will be able to react faster.Method:1. Set up apparatus as shown in the diagram.2. Use a measuring cylinder to measure 20ml of hydrogen peroxide and use another measure cylinder to measure 20ml of distilled water.3. Measure 0.02g of manganese oxide using a measuring scale (remember to put a paper tower on the scale first so that manganese oxide wouldnt be able to direct ly touch the scale, which might cause malfunction to the scale if manganese oxide goes in the internal of the scale)4. Put the manganese oxide into a flask and put the 20ml of distilled water into the flask as well.5. Reset (push the gas syringe back to 0cmÃ ¯Ã ¿Ã ½ if needed) the gas syringe if needed, and then put the 20ml of hydrogen peroxide into the flask and start the stop watch.6. Observe the gas syringe and take note of the volume of gas (in this case oxygen) produced every 10 sec, 20 sec, 30 sec, 40 sec, 50 sec and 60 sec.7. Repeat step 2-6 for 0.04g, 0.06g, 0.08g and 0.1g of manganese oxide but must clean the flask before using it again.8. After obtaining all of the results, repeat each one 2 more times.Diagram:Pretest:I did a few pretests:0.01g manganese oxide and 10 volume concentration of hydrogen peroxide (20ml):Time (sec)Volume of gas produced (cmÃ ¯Ã ¿Ã ½)00101520203031404150506060By using 0.01g of manganese oxide, the maximum reached is already 60cmÃ ¯Ã ¿Ã ½, therefore I thought if I used 0.1g, the limit of the gas syringe (100cmÃ ¯Ã ¿Ã ½) will be reached with less than 60 sec, so I have decided to try and reduce the concentration and see whether it is a good choice.0.1g manganese oxide and 5 volume concentration of hydrogen peroxide (20ml):Time (sec)Volume of gas produced (cmÃ ¯Ã ¿Ã ½)00101520313040404950566061Later, I tried using only 10ml of hydrogen peroxide but it wasnt enough for my experiment and it caused a limiting factor very soon in the experiment (when I tested 0.04g of manganese oxide) due to the shortage of hydrogen peroxide molecules for decomposing.The second pretest gave me good range of results to use and it didnt reach the gas syringes limit (100cmÃ ¯Ã ¿Ã ½) so that wouldnt limit my results. Also, in the result taking, I realized that I would need a lot of time to refill my catalyst and liquids, therefore I have chosen to only do 0.02, 0.04, 0.06, 0.08 and 0.1. This will give me a good range of results to calculate the rate of reaction and also sufficient for supporting my prediction.Obtaining:Here is the tables of results to show the volume of gas produced using different amounts of catalysts. I will also show the average:0.02g catalyst usedAmount of gas produced (cmÃ ¯Ã ¿Ã ½)Time (sec)Trial 1Trial 2Trial 3AverageAverage Gain in gas produced from previous (cmÃ ¯Ã ¿Ã ½)00000.000.00104343.673.67207687.003.333010111211.004.004014151514.673.675020192019.675.006023232423.333.670.04g catalyst usedAmount of gas produced (cmÃ ¯Ã ¿Ã ½)Time (sec)Trial 1Trial 2Trial 3AverageAverage Gain in gas produced from previous (cmÃ ¯Ã ¿Ã ½)00000.000.00105876.676.672013141313.336.673020191919.336.004029302829.009.675035353635.336.336042414041.005.670.06g catalyst usedAmount of gas produced (cmÃ ¯Ã ¿Ã ½)Time (sec)Trial 1Trial 2Trial 3AverageAverage Gain in gas produced from previous (cmÃ ¯Ã ¿Ã ½)00000.000.001010111110.6710.672022212021.0010.333032303331.6710.674040394140.008.335046484646. 676.676051505050.333.670.08g catalyst usedAmount of gas produced (cmÃ ¯Ã ¿Ã ½)Time (sec)Trial 1Trial 2Trial 3AverageAverage Gain in gas produced from previous (cmÃ ¯Ã ¿Ã ½)00000.000.001018181617.3317.332031302930.0012.673040414140.6710.674048474546.676.005055545554.678.006062616261.677.000.10g catalyst usedAmount of gas produced (cmÃ ¯Ã ¿Ã ½)Time (sec)Trial 1Trial 2Trial 3AverageAverage Gain in gas produced from previous (cmÃ ¯Ã ¿Ã ½)00000.000.001031313331.6731.672045474545.6714.003053525453.007.334060615960.007.005068676767.337.336073727272.335.00I have taken the chance to add in another column (average gain in gas produced from previous reading) to show whether there is a certain pattern.Analysis:My graph clearly shows that as I increase the amount of manganese oxide, I will increase the rate of decomposition of hydrogen peroxide. This supports my prediction fully (prediction: the grater the amount of manganese oxide is added to the solution, the greater the rate of re action decomposition of hydrogen peroxide:H2O2 (aq) = 2H2O (l) + O2 (g))We can clearly see that with the line of best fit drawn the points are not that far away from this line, showing a quite strong relationshipThe rate of the decomposition (when the reaction is at its 20th second) for 0.02g of catalyst used is 0.35cmÃ ¯Ã ¿Ã ½/sec, for 0.04g it is 0.67cmÃ ¯Ã ¿Ã ½/sec, for 0.06g it is 1.05cmÃ ¯Ã ¿Ã ½/sec, for 0.08g it is 1.5cmÃ ¯Ã ¿Ã ½/sec and for 0.10g it is 2.28cmÃ ¯Ã ¿Ã ½/sec. This also supports my prediction because the rate of decomposition is increasing when the amount of catalyst increases. I chose to use 20th second into the reaction to calculate the rate because at the 20th second, all the reactions hasnt yet used up or near used up the hydrogen peroxides, therefore not reaching the point where there arent enough, which will cause a slow down in the rate.In theory, the graph should show a steep gradient at the beginning of the decomposition. By looking at th e graph, it does show a steeper gradient at the beginning but not for the line of best fit of 0.02g and 0.04g, this might be because the rate of decomposition is too slow to see any real effect. However, the other 3 lines show a steep gradient in the beginning. The end of the lines (0.06g, 0.08g and 0.10g) all tend to approach a point where it will stop the reaction (can be seen by the curve). The line for 0.10g has the greatest curve. This is because there are most catalyst compared to the others, therefore increases the rate of decomposition the fastest. The manganese oxide has therefore acted as a catalyst and as with all catalysts has lowered the activation energy required in order for this reaction to take place. In doing so the rate of reaction has increased. So the more manganese oxide means lowering the activation energy more effectively. A catalyst basically works like:If without catalyst, the energy for the reaction to take place is relatively high, but if a catalyst is ad ded, the activation energy lowers, therefore enabling the reactants to react with less energy. The activation energy of the reaction is about 75 kJ/mol in the absence of catalyst. The activation energy of the reaction is about 58 kJ/mol if manganese oxide is added to the reaction.However, towards the bottom end of the graph the lines (0.06g, 0.08g, 0.10g) are a lot shallower compared to the start. This shallower lines show that it is finding it hard to produce oxygen at a fast rate because there are not enough molecules left to decompose itself.Some of the results could be wrong, however I can still pull some conclusions from this and one is that we can definitely see that as the amount of manganese oxide increases, the faster oxygen is produced.Evaluation:Overall I think I carried out this investigation to my greatest capabilities.The data that I collected was fairly reliable because of the strong correlation and the accuracy of my experiment was reasonable. It also was enough to s upport my prediction. However, there are some anomalies which might be caused by several errors such as:1. The measuring balance wasnt exactly accurate because sometimes the more I add, the more the mass reading on the balance decreases.2. My reaction time, because even though I try my fastest to obtain the results, I will still be around 0.5 1.5 sec off from the correct time to take the results.There was also a big problem:As soon as the Manganese Dioxide touched the Hydrogen Peroxide, oxygen was produced straightaway. So I lost quite a lot of gas before we put the bung on. I tried to counter this problem by adding the hydrogen peroxide last because liquid is easy to transfer to the flask compared to transferring manganese oxide because the powder might possibly stick to the top of the flask and unable to go down to the hydrogen peroxide. Also, I started the countdown the second the bung was fitted on properly as soon as the oxygen was going up the flask.A major cause for concern on accuracy was the reading of the overall measurement of the oxygen produced but also the measurements of hydrogen peroxide and water used for the experiment. So if these miss-readings were carried out through the whole investigation then my results will be quite a long way out.Looking back on experiment I believe that there are many ways to improve it. One way is the accuracy of the measuring of the catalyst this can be done by requesting a new scale which should not have any chances of any faulty measurements. This would make every measurement of catalyst I take virtually no faults at all.My graph is very basic and one way to improve this will be to increase my range of tests, this will allow me to know where exactly the point where no more oxygen can be created is. Maybe doing until 2 minutes (120 sec) will allow me to locate where it is. I think the timing was as accurate and reliable as it could be, but only a second or third experiment would back that up fully. The equipment we used was reasonable but not the best, but for the conditions we were based in it was the best we were going to get.I could investigate on what type of catalysts is more effective for the speeding up of the decomposition of hydrogen peroxide. Possible catalyst selections include:* Manganese IV oxide (MnO2)* Zinc oxide (ZnO)* Lead IV oxide (PbO2)* Aluminium oxide (Al2O3)* Iron III oxide (Fe2O3)* Copper II oxide (CuO)* Copper III oxide (Cu2O)This might help me understand more about catalyst and what type of metals are best for catalysts, such as: transition metals.I could investigate on the concentration of hydrogen peroxide and keeping the catalyst constant, and also I can investigate on the effects of pH with rates of reaction.
Sunday, March 1, 2020
Significant Events of the Delaware Colony The Delaware colony was founded in 1638 by European colonists from the Netherlands and Sweden. Its history includes occupations by the Dutch, Swedish, British- and the colony of Pennsylvania, which included Delaware until 1703. Fast Facts: Delaware Colony Also Known As: New Netherland, New SwedenNamed After: Then-governor of Virginia, Lord de la WarrFounding Country: Netherlands, SwedenFounding Year: 1638First Known European Landing: Samuel ArgallResidential Native Communities: Lenni Lenape and NanticokeFounders: Peter Minuit and the New Sweden CompanyImportant People: James, Duke of York, William Penn Early Arrivals The first European arrivals in the area occurred in the early 17th century when the Dutch were involved in establishing many trading posts and colonies around the world including in North America. Henry Hudson had been hired by the Dutch to explore the New World in 1609 and he discovered and named the Hudson River. By 1611, the Dutch had established fur trading enterprises with the Native Americans called the Lenni Lenape. In 1614, Fort Nassau, on what is the Hudson River near Gloucester, New Jersey, was the earliest Dutch settlement in the New World. Peter Minuit and the New Sweden Company In 1637, Swedish explorers and stockholders created the New Sweden Company to explore and trade in the New World, under a charter with Swedish king Gustavus Adolphus. Adolphus died in 1632, and his daughter and successor Queen Christina took over the charters administration. Christinas chancellor formed the New Sweden Company in 1637 and hired Peter Minuit. Minuit was a German-born Dutch resident likely of French Huguenot ancestry, who had previously been the governor of New Netherland from 1626 to 1631 and is most well known for the purchase of Manhattan Island. In March of 1638, Minuit and his two ships, Key of Kalmar and the Griffin, landed at the mouth of a river they named Christina, in what is now Wilmington and founded the first permanent colony in Delaware. Annexed to New Netherland While the Dutch and Swedes coexisted for some time, the incursion of the Dutch into New Sweden territory saw its leader, Johan Rising, move against some Dutch settlements. In 1655, Peter Stuyvesant, New Netherlands governor, sent armed ships to New Sweden. The colony surrendered without a fight.Ã Thus, the area that was once New Sweden then became part of New Netherland.Ã British Ownership The British and Dutch were direct competitors during the 17th century. England felt they had a claim to the prosperous New Netherland territory due to the explorations by John Cabot made in 1498. In 1660, with the restoration of Charles II to the throne of England, the Dutch feared the British would attack their territory and forged an alliance with the French against the British. In response, Charles IIÃ gave his brother, James, the Duke of York, New Netherland in March 1664. This annexation of New Netherland required a show of force. James sent a fleet of ships to New Netherland to demand its surrender. Peter Stuyvesant agreed. While the northern part of the New Netherland was named New York, the lower part was leased to William Penn as the lower counties on the Delaware. Penn wanted access to the sea from Pennsylvania. Thus, the territory was part of Pennsylvania until 1703. In addition, Delaware continued to share a governor with Pennsylvania until the Revolutionary War, even though it had its own representative assembly.Ã Beginning the War of Independence In October 1765, Delaware sent two delegates to a congress of the colonies in New York to deliberate on a joint colonial response to recent British measures, in particular, the Sugar Act of 1764 and the Stamp Act of 1765. The two men were landholder Caesar Rodney and attorney Thomas McKean: the two men and assemblyman George Read would continue to play a role in the movement for independence.Ã Delaware declared its independence from Great Britain on June 15, 1776, and signed the declaration of independence with its fellow colonies on July 4. Sources Delaware Facts. Delaware Historical SocietyMunroe, John A. History of Delaware, 5th ed. Cranbury NJ: University of Delaware Press, 2006.Wiener, Roberta and James R. Arnold. Delaware: The History of Delaware Colony, 1638Ã¢â¬â1776. Chicago, Raintree, 2005.
Thursday, February 13, 2020
The Cold War and Post-War Economic Recovery - Research Paper Example The Cold War resulted in an arms race between these two countries which lasted as long as the Cold War did. It was this era when one after another highly destructive nuclear weapons were created by both the U.S and the Soviet Union. This arms race did not only terrorize the people of both the countries but also affected the culture of these nations as well (Sakwa, 1999). After the Second World War European nations were in ruins, many cities turned into piles of dust and economies collapsed. U.S and Soviet Union were established as the strongest powers of the world and both of them had different views about the post-war Europe and its rehabilitation which resulted in the Cold War. This document enlightens briefly the history of Cold War and its impact on the Post-War Economic Recovery of the nations. Origins of the Cold War The beginning of Cold War was immediately after the successful alliance of the US and the Soviet Union in the war against Nazi Germany. The conflict took place whe n both the US and the Soviet Union perceived each other as superpowers with their political and economic differences. Soon after the war ended, the conflicts of opinion and differences started to arise regarding how the post-war Europe should be separated. ... Throughout the war, were the times when the atmosphere was relatively calm and there were also times when high tension prevailed between both the countries. Some of the tense periods include the Berlin Blockade that took place between 1948 & 1949, the Korean War which took place between 1950 & 1953, the Cuban Missile Crisis of 1962 and the Soviet war in Afghanistan which took place between 1979 & 1989. In most of these instances, both the US and the USSR supported rival groups and an indirect war was fought between the two nations. Both sides possessed heavy nuclear weapons that could have caused mass destruction. The use of such weapons was not made due to the same reason. Both the countries provided extensive support to any country that was deemed vulnerable or engaged in proxy wars, development of extensive nuclear weapons, rivalry in economic developments or rivalry in sports events. Attempts were made to get support from neutral nations. Stiff competition took place in technolog ical development which was represented by engaging in space race. There was a very high risk of destruction of both the superpowers because of nuclear exchange either by accident or mistake however both the countries sought to prevent any direct attack through agreements. Later on, the economic and military pressure on the Soviet Union was increased by the United States as Soviet Union was not so successful in developing its economy. As a result Soviet Union collapsed in 1991 which heralded the end of Cold War leaving US as the most dominant power of the world. The impact of the Cold War has been quite significant on the American culture and how the post-war economic recovery of the European nations was planned and implemented (Foner, 2009). Post-war Economic Recovery in Europe, Japan
Saturday, February 1, 2020
An introduction into the importance and nature of gastronomic events (Afternoon tea) - Essay Example ion during the period of 1840 and was introduced with the propose of escalating the feel of hunger for a meal that takes place during evening session, especially around the time of 8pm (handpickedhotels.co.uk, 2014). Afternoon tea comprises of various food items such as cakes, sugary pastries, patties along with a cup of tea. This gastronomic event was first practiced as a portion of a socializing event that used to be private in nature and used to be practiced by the female populations of Britain and these females mostly represented the upper class of the society. Later this event was awarded with the status of being a formal occasion as the practice of afternoon tea was exercised by Queen Victoria and the event was recognized as tea receptions. Tea receptions are events that comprise of around 200 guests that visit a home where the event is held during evening hours and these visitors are allowed to be a part of the event whenever they wish to during evening hours. Afternoon Tea Parties in East Sussex. (n.d.). Afternoon Tea venue in East Sussex at Buxted Park Hotel. Retrieved February 15, 2014, from
Friday, January 24, 2020
Explain what is implied by the assumption that decision-makers are rational? How is the assumption of rationality used in the economic analysis of individual behaviour? In many academic disciplines much is spoken about rationality and rational choices. Economists generally refer to 'rational' choices and that individuals in economic theory are rational. By rational we mean people choose options which they perceive to be the best, given the circumstances they are in. In terms of making rational choices some of the conceivable options for example of going to work would be: Ã · Actually going to work. Ã · Staying at home Ã · Going out shopping Ã · Buying a house Ã · Fly to the moon etc. But with these choices we face constraints and it is these constraints that define our 'feasible' options so flying to the moon would not be a feasible option. Therefore the options we can choose from is called the 'feasible set' and it is our preferences i.e. our likes and dislikes and their relative intensity, which determines which feasible option we choose. When we make a choice it generates 'utility' which is a measure of the emotional experience associated with the outcome of a choice so basically the satisfaction from the consumption of a good. We talk about 'total utility' meaning the total satisfaction a person gains from all units of a commodity consumed within a time period. We also use the term 'marginal utility' which is additional satisfaction gained from consuming one extra unit within a time period. There is a general model of rational choice where economists assume that agents such as decision makers will firstly identify a feasible set of options and then assess the expected utility of each option ... ...tility and therefore the amount of meals must decrease to keep the utility constant. Due to the fact that the consumer will prefer more to less the curve must slope downwards. The slope of each curve does get steadily flatter as we move to the right due to the assumption of a diminishing marginal rate of substitution. For example in this case at point A the consumer will sacrifice a lot of films for few meals because he/she has so many films. Whereas point B he/she has less films relative to meals so willing to sacrifice a smaller amount of films for additional meals. However this kind of economic analysis is based on rational behaviour of consumers. It does not take into account people with maybe addictions such as smokers or people under the influence of alcohol or drugs. In economics we assume rational thinking and behaviour will always take place.
Thursday, January 16, 2020
1.Describe some of the influence of Latin music in the US in the early part of the twentieth century. In the early part of the twentieth century, Latin music influenced the creation of a new type of music, Afro-Cuban Jazz.2.What was the significance of Ã¢â¬Å"Machito and His Afro-CubansÃ¢â¬ ? Ã¢â¬Å"Machito and His Afro-CubansÃ¢â¬ created the genre of Afro-Cuban Jazz and created a bridge between the two cultures, and found success with white people.3.How did Dizzy Gillespie incorporate Latin music into his music? Dizzy Gillespie invited a player from Cuba named Chano, and the two of them worked together.4.What was the Palladium?Palladium was located in mid-town Manhattan. It was a former dance studio, but it was transformed into the home of the Mambo.5.How did the television and films increase the exposure of the US to Latin music? The television and films increased the exposure of the US to Latin music, because it allowed the public to slowly become familiarized with it. Televi sion shows like Ã¢â¬Å"I Love LucyÃ¢â¬ showed that white women and Cuban men could be together. Due to the fact that the men were Cuban, they also played their music on the show as well. 6.How did Latin music influence rock music?Latin music influenced rock music they both had the same chord progression, bass lines and rhythms. 7.Why do you think Latin music had such a great influence on the development of popular music? I believe that the reason why Latin Music had such a great influence on the development of popular music, is because it was new, and its upbeat rhythms made it easy to listen to and encouraged people to dance and have a great time. 8.Do you think that any of the music that you listen to has Latin influences? Why or why not? Yes, I do believe that Latin music has influenced the music I listen to. I listen to Latin artists such as Pitbull, and I enjoy his music very much. At the same time, I listen to a lot of upbeat rhythm songs that have somewhat of a Latin feel to them.
Wednesday, January 8, 2020
The prevalence of childhood obesity has remained a serious matter in the United States over the years despite its recent decline (Centers for Disease Control and Prevention, 2015). Children who are obese can experience the same devastating health effects as adults who are obese Ã¢â¬â cardiovascular issues, diabetes, breathing problems, and so forth. In addition, children who are obese are more than likely to become obese as adults, therefore the development of a health fair that would highlight increased physical activity, increased in consumption of fruits and vegetables, and decrease in the amount of sugar sweetened beverages would be a start in tackling this problem. This single solution may not help reduce rates of childhood obesity in the United States by itself, but public policy action is essential (Robbins, Niederdeppe, Lundell, Meyerson, 2013). A cross-sectional study performed from July 2013 to October 2014 displayed a comparison in the trends since an implementation of a policy Ã¢â¬â specifically a competitive food and beverage policy (Sanchez-Vaznaugh, SÃ ¡nchez, Crawford, Egerter, 2015). The objective was to determine if there was an association between this policy and population-level trends in childhood overweight/obesity. Having a health fair would help push the message out. In another study, the effects of messages describing consequences of childhood obesity was collected from two nationally representative internet based surveys (Gollust, Niederdeppe, Barry,Show MoreRelatedChildhood Obesity : The Prevalence Of Obesity1525 Words Ã |Ã 7 PagesIn recent years, the worldÃ¢â¬â¢s prevalence of obesity in children has increased alarmingly in most of the countries. It is estimated that 170 million of children under 18 years old are overweight, in the US there is a 30% prevalence of obesity, similarly 27% of children in Mexico are obese (OCDE, 2014; GutiÃ ©rrez et al., 2012). In some countries like East Germany, New Zealand, the Netherlands and Canada the prevalence of overweight children had risen by one percentage point each year (Wang LobesteinRead MoreThe Prevalence Of Childhood Obesity Essay1860 Words Ã |Ã 8 PagesThe prevalence of childhood obesity in the United States has greatly increased in the past two to three decades 1, while incidence of obesity has doubled worldwide since 1980 2. Today, the World Health Organization (WHO) estimates over 170 million children and adolescents worldwide are overweight. Particularly in the United States, prevalence of obesity in children has increased from 13.9% in 1999 to 31.8% in 2010 3. After nearly two decades of increase, the rates have started to plateau 4. ThresholdsRead MoreThe Importance Of Childhood Obesity In Canada1072 Words Ã |Ã 5 PagesThe prevalence of childhood obesity is growing at a frightening rate. By definition, children ages 2-17 years of age that are at, or above the 95th percentile for BMI are obese (Centers for Disease Control and Prevention, 2017). On the global scale, Canada is ranked eleventh highest for childhood obesity (OECD, 2014) with more than one in four children in Canada being obese (Public Health Agency of Canada, 2012). 31.5% of Canadian children aged 5 to 17 were overweight (19.8%) or obe se (11.7%) inRead MoreEssay on Childhood Obesity1599 Words Ã |Ã 7 PagesChildhood obesity is one of the most serious public health challenges of the 21st century. The problem is global and is steadily affecting many low- and middle-income families particularly in the United States. The socioeconomic status of these families contributes to the childhood obesity epidemic. 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These analysis help provide a clearer understanding of why obesity is a national epidemic. It is significant as public health officials to know that there are substantial racial differences in obesity among young kids and teenagers in the United States. Among Hispanics for instance, the incidence of obesity was higher in 2011-2012