Dilution Calculations From Stock Solutions in Chemistry

If youre working in a chemistry lab, its essential to know how to calculate a dilution. Review of Dilution, Concentration, and Stock Solutions A dilution is a solution made by adding more solvent to a more concentrated solution (stock solution), which reduces the concentration of the solute. An example of a dilute solution is tap water, which is mostly water (solvent), with a small amount of dissolved minerals and gasses (solutes). An example of a concentrated solution is 98 percent sulfuric acid (~18 M). The primary reason you start with a concentrated solution and then dilute it to make a dilution is that its very difficult—and sometimes impossible—to accurately measure solute to prepare a dilute solution, so there would be a large degree of error in the concentration value. Use the law of conservation of mass to perform the calculation for the dilution: MdilutionVdilution MstockVstock Dilution Example As an example, say you need to prepare 50 milliliters of a 1.0 M solution from a 2.0 M stock solution. Your first step is to calculate the volume of stock solution that is required. MdilutionVdilution MstockVstock(1.0 M)(50 ml) (2.0 M)(x ml)x [(1.0 M)(50 ml)]/2.0 Mx 25 ml of stock solution To make your solution, pour 25 ml of stock solution into a 50 ml volumetric flask. Dilute it with solvent to the 50 ml line. Avoid This Common Dilution Mistake Its a common mistake to add too much solvent when making the dilution. Make sure you pour the concentrated solution into the flask and then dilute it to the volume mark. Do not, for example, mix 250 ml of concentrated solution with 1 liter of solvent to make a 1-liter solution.

Utopi An Island Shaped Like A Crescent - 1081 Words

1. Utopia is an island shaped like a crescent, with eleven miles of sea in-between the top and bottom point that doesn’t have any currents. This sea allows for everyone that lives in Utopia to be able to trade. Entering the bay that surrounds Utopia is dangerous because of the hidden rocks, which are known by the locals, but not by strangers so it is hard for them to enter. There are fifty-four cities, all having the same customs and laws, and all large. The city of Amaurot is near the center of Utopia, which is why it is the city where every year three senators are sent to talk about their concerns. (found on page 45-47) Their geography helped develop their society into one that was isolated from other societies, but very close and similar within its own community. 2. Utopians believe in working hard and working equally. There work day is only six hours, but yet they are very productive. They have plenty of gold and silver, but it does not play a roll in the economy because it is seen as child-like to desire luxuries. Gold and silver are only used to offer to their opponents during war. There is no money, so Utopians always make sure to have more than enough goods so that there is no unfairness. Everyone is trained in agriculture, but everyone has a separate job. 3. Capitalism is an economic system where the trade and industry of a country are maintained and controlled by private owners, rather than the government. Socialism is an economic model of social organization

Childhood Obesity A Public Health Crisis - 1237 Words

Introduction Childhood obesity is a public health crisis in Canada. Research shows that childhood obesity is related to morbidity and mortality in adulthood (Tremblay, 2010). According to one study about 31% of Canadian youth between the ages of 2-17 years are obese and overweight, which put them on a greater risk for developing chronic conditions in their early adulthood years (Vine Elliot, 2014). Children spend most of their time during the day in the schools, hence, it is very important that schools needs to implement interventions related to healthy diet and meals. Furthermore, eating patterns in childhood determines the eating habits in adulthood, so implementation of healthy eating policies in secondary schools is very essential as†¦show more content†¦For example, nutritious standard PPM 150 was implemented in 2011 in Ontario. According to this policy, the food and beverages sold on school premises must meet the specific nutritional requirements (Ontario Ministry of Education, 20 17). The standards is applicable to school cafeterias and vending machines. Furthermore, it limits the bake sales in schools as well, only 10 bake sales per year is allowed (Vine Elliot, 2014). Physical inactivity is another area of concern as it is associated with chronic diseases and obesity. One study shows that about 50% of Canadian youth is not physically active enough and about 90% do not achieve minimum 90 minutes of physical activity per day (Lagarde LeBlanc, 2010). Sedentary life styles, availability of electronic gadgets and lack of motivation are some of the factors that contributes towards physical inactivity among children. Health promotion and Advocacy for Heathy Eating The Ottawa Charter for Health Promotion defines, â€Å"Health promotion is the process of enabling people to increase control over, and to improve, their health (Public Health Agency of Canada, 2014). Canadian Community Health Nursing Standards of Practice defines the scope of community nursing and establish criteria for safe, ethical care and acceptable nursing practice (Stanhope Lancaster, 2011). Furthermore, standards also promotes the community health nursing as a specialty and support ongoing development ofShow MoreRelatedChildhood Obesity Is Becoming A Major Public Health Crisis Essay1375 Words   |  6 PagesIntroduction Childhood obesity is becoming a major public health crisis in both children and adults. The American Heritage dictionary simply defines obesity as a condition of increased body weight that is due to excessive build up of fat in the body. The CDC (Center for Disease Control), use the BMI (Basal Metabolic Index) and CDC growth charts to determine obesity and overweight in adolescents and children. The BMI-for-age percentile is determined by plotting the BMI value. Using this chart, obesity is definedRead MoreBackground and Methodology of the Research Process to Problems in Health Care1003 Words   |  5 PagesProcess to Problems in Health Care Childhood Obesity HCS/465 August 2, 2012 Donald Steacy Introduction The purpose of the paper is to show how to develop and understand methodology of the research process when pertaining to health care. The process consists of retrieving a peer-reviewed article and applying the research methodology to the article selected. 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It occurs when a child is well above the normal weight for his or her age and height (Mayo Clinic, 2014). This enquiry question will mainly focus on children who are obese in New Zealand. Through survey, The 2012/13 New Zealand Health Survey found that 1 in 9 children aged 2–14 years were obese (11%), in New Zealand (Ministry of Healt h, 2014). ChildhoodRead MoreCritical Arguement Analysis Essay812 Words   |  4 PagesENG/215CA October 10, 2011 Patricia Moody Critical Argument Analysis Childhood obesity is an ongoing epidemic in today’s society. This essay will focus on three different professional articles, which are related to childhood obesity. The three articles in this essay are â€Å"Fighting Childhood Obesity,† â€Å"Recognizing and Preventing Childhood Obesity,† and â€Å"Understanding and Acting on the Growing Childhood and Adolescent Weight Crisis: A Role for Social Work.† It will explain how the authors of these threeRead MoreObesity : Obesity And Obesity1637 Words   |  7 Pagesincrease in rates of childhood and adolescent obesity, the health impacts this can have on a child immediately and in the future, and what are the contributing factors to this increase in obese youths. A possible contributing factor is food advertisements that contain poor-nutrient food and are targeted at children. Children and adolescents are constantly exposed to various advertisements on a daily basis. Many studies have suggested that there would be an overall reduction in obesity and overweight ratesRead MoreMedication Can Help Reduce Childhood Obesity Essay841 Words   |  4 Pagesknow that childhood obesity can be very harmful for our nations children. Not only can obesity cause health problems but also psychological problems. In recent years, policymakers and medical experts have expressed alarm about the growing problem of childhood obesity in the United States. While most agree that the issue deserves attention, consensus dissolves around how to respond to the problem. One literature review examines one approach to treating childhood obesity: medicationRead MoreFactors Contributing Factors That Causes Obesity Among Children Essay1364 Words   |  6 Pagescauses of obesity among children in New Zealand? Introduction Childhood obesity is a serious medical condition that occurs when a child is well above the normal weight for his or her age and height (Mayo Clinic, 2014). According to Sameera and Amar childhood obesity is a major public health crisis nationally and internationally, which arises because of the differences in lifestyle consequences among different cultural people in New Zealand (2012). This abnormality can cause various health risks suchRead MoreThe Obesity Epidemic Of Children1437 Words   |  6 Pageslink to obese children The obesity epidemic holds the responsibility to annihilate many of the health benefits that have contributed to the increased durability recognised in the world today. In 2014, approximately 41 million children under 5 years of age were affected by overweight or obesity. Today, progress in extinguishing childhood obesity has been gradual and conflicting. A greater number of children are, even from before birth, on the brink to developing obesity. Children who are not yet atRead MoreFactors Contributing Factors That Causes Obesity Among Children Essay1369 Words   |  6 PagesChildhood obesity is a major health issue that takes place when a child is beyond the average weight for his or her age and height (Mayo Clinic, 2014). According to Sameera and Amar childhood obesity is a major public health crisis nationally and internationally, which arises because of the differences in lifestyle consequences among different cultural people in New Zealand (2012). This abnormality can cause v arious health risks such as diabetes and heart disease (World Health Organisation, 2014)

State-Sponsored Terrorism The Relationship between...

Most of the countries involved in state-sponsored terrorism make modest attempts to disassociate themselves with terrorist organizations. These countries do this in hopes that the United Nations will not place sanctions. More often than not, these countries continue their support of various terrorist groups. They support the terrorist organization in various ways: financially, training, supplies. Iran has remained the most active state sponsor of terrorism to date (State Department, 2013). Iran supports several different terrorist organizations, including Hamas, Palestine Islamic Jihad, Popular Front for the Liberation of Palestine-General Command and Hizballah. Often times, Iran is involved in the planning and support of different†¦show more content†¦The common definition of state-sponsored terrorism is terrorism practiced by a government against its own people or in support of international terrorism. Currently, there are only four countries that are on the US State Depar tment’s list of State Sponsors of Terrorism: Cuba, Iran, Sudan and Syria. These countries have been accused of providing different types of aid to several different terrorist organizations throughout the world. A country is placed on the State Sponsor list when it has demonstrated to the United States government they frequently give support to terrorist organizations. The United States government automatically places four sanctions on these countries: a ban on arms-related exports and sales, controls over exports of dual-use items, prohibitions of economic aid and various financial and other restrictions (State Department, 2013). Hizballah (Party of God), a Shia Muslim organization, was established in 1982 as a response to the Israeli invasion of Lebanon. Hizballah has several different goals and is funded in many ways. It was not until October 8, 1997 that Hizballah was classified as a Foreign Terrorist Organization, even though they had been linked to several terrorist attacks dating backShow MoreRelatedQuds Force : The Hand Of Iran2699 Words   |  11 PagesHenley-Putnam University 06/29/2015 Author Note Mathew Heazlett is a Master’s Student in the Terrorism Counter Terrorism Studies at Henley-Putnam University. Submitted to the faculty of Henley-Putnam University, this research paper is in partial fulfillment of the requirements for TCT 596.4A, Origins, Evolutions, and trends in Terrorism and the Master’s Terrorism and Counter Terrorism Studies program. Contact Mathew Heazlett at MathewHeazlett@stu.henley-putnam.edu for correspondence regardingRead MoreEssay about The Scourge of Terrorism3471 Words   |  14 Pagesdesires of all humans. A placid emotional state that is individually subjective. Individuals have a right to pursue the happiness they desire. And yet strife, injustice, want, and oppression are what most individuals on earth experience, to varying degrees. These iniquities spawn increasing acts of terrorism and are characteristic of a variety of despondent groups. Will terrorism be a world-wide scourge in the 21st century? What interaction is there between terrorists and the television media?

Resolution of Matter into Pure Substances free essay sample

The purpose of this laboratory was to determine how different substances have different solubilities in a given solvent. This was accomplished using the method of chromatography. The solubility of each substance was first determined by dropping a drop or two of each on a line drawn 2 inches above the bottom of a piece of paper. Then the paper was lightly bent in order to tape both sides of the paper leaving about a 4 centimeter gap so that the sides of the paper are not touching. The paper was then put into a beaker of a hydrochloric acid, ethanol, and butanol mixture, being sure that the paper does not touch the sides of the beaker, and then topped. After the eluting solution has risen to within two centimeters of the top of the filter paper, the paper was removed from the beaker, dried, and was stained with a staining reagent solution containing potassium ferrocyanide and potassium iodide. We will write a custom essay sample on Resolution of Matter into Pure Substances or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page This reagent forms colored precipitates or reaction products with many cations, including all of those used in this experiment. The distance of which the spots moved were determined by calculating the Rf value of each substance. The Rf value is determined by following formula: This experiment was successful overall, given a few errors. This experiment was done twice due to the paper having pen ink marks which interfered with the movement of the substances in the first experiment. During the second trial, it was a little difficult to measure the distance the substances traveled because multiple drops of each were dropped right above each other rather than on top of each other. By the end of the experiment, the distance traveled by each substance and the color changes of each substance was still clear and was able to be measured and recorded.

Meena Alexander Essay Example For Students

Meena Alexander Essay This struggle is the very reason for the writings of memoirs on the parts of Meena Alexander and Sara Suleri. The authors are not very old meaning that a general need to convey the sum of their life experiences has not beset them yet for their lives are obviously not over. While they certainly feel a general urge to impart their knowledge and experiences to the world, the primary objective of their texts is the selfish goal of assistance in their own definitions of themselves and the spaces of womanhood in which they exist. By imprinting this struggle to paper, the authors assist themselves in this definition. While this endeavor into the realm of the self assists the authors of the memoirs, it is not the means by which they elect to connect with their readers. The actual connection required for a higher level of appreciation finds itself within the physical and tangible imagery conveyed by Suleri and Alexandar (Barlow 286). Within their self-definition, these authors assert their own feminine physical nature, and thereby communicate a sense of themselves through their images. The culmination of this defining takes form in Alexanders vivid description of birth and the feel of lips, and my breast beneath (Alexander 167). In turn, the physiological imagery utilized by Suleri bolsters not only her self-image and presence, but also the very tangible and realistic relation of these images in the physical world. In her writing temporal boundaries are transcended through the realistic nature of her images. The reader connects to the text in a sense that in order to appreciate these visions of another persons life and space, one must enter into the described situation for a moment and feel therein, not only the actual description, but also the emotions and views of the author at that precise moment. In the reading of this scene in Meatless Days, to sleep on Ifats bed was milk enough, to sleep in crumbling rest beside her body. Sometimes like water she runs through the sentences of sleep, a medium something other than itself, refracting, innocent of all the algae it can bear and capable of much transmogrification. Her water laps around me almost in reproach (Suleri 186), the reader cannot only envision the bed Suleri discusses, but also, through her control of syntax by means of utilizing the present tense and first person narrative, the understanding of the images of algae, milk, water lapping and crumbling rest evolves to a level of emotional understanding and connection with the view of the author. Through this the space the reader is effectively transcended and the labeling of the other not only disappears, but is never even given a chance to exist. The use of imagery within writing takes on entirely new assets inside works of fiction, primarily in terms of its depth and the convenience of its access in the midst of this medium. The symbolic images of fiction are meant to be interpreted. This much more complex shape of symbolism reflects an art form of expressing the depth and intensity of a given situation through alternative means of literary tools by moving beyond already presented knowledge. This in turn constructs an emotional link between oneself and the text as the reader becomes more psychologically and emotionally involved in the interpretation. In Fasting, Feasting, Anita Desai repeatedly demonstrates her ability to manipulate both of the literary aspects of symbolism, beginning with the more descriptive symbolism as a contrivance through which to better acquaint the reader with the setting and characters of the novel. .u712b6f24bba7767f7991f37c460536ea , .u712b6f24bba7767f7991f37c460536ea .postImageUrl , .u712b6f24bba7767f7991f37c460536ea .centered-text-area { min-height: 80px; position: relative; } .u712b6f24bba7767f7991f37c460536ea , .u712b6f24bba7767f7991f37c460536ea:hover , .u712b6f24bba7767f7991f37c460536ea:visited , .u712b6f24bba7767f7991f37c460536ea:active { border:0!important; } .u712b6f24bba7767f7991f37c460536ea .clearfix:after { content: ""; display: table; clear: both; } .u712b6f24bba7767f7991f37c460536ea { display: block; transition: background-color 250ms; webkit-transition: background-color 250ms; width: 100%; opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #95A5A6; } .u712b6f24bba7767f7991f37c460536ea:active , .u712b6f24bba7767f7991f37c460536ea:hover { opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #2C3E50; } .u712b6f24bba7767f7991f37c460536ea .centered-text-area { width: 100%; position: relative ; } .u712b6f24bba7767f7991f37c460536ea .ctaText { border-bottom: 0 solid #fff; color: #2980B9; font-size: 16px; font-weight: bold; margin: 0; padding: 0; text-decoration: underline; } .u712b6f24bba7767f7991f37c460536ea .postTitle { color: #FFFFFF; font-size: 16px; font-weight: 600; margin: 0; padding: 0; width: 100%; } .u712b6f24bba7767f7991f37c460536ea .ctaButton { background-color: #7F8C8D!important; color: #2980B9; border: none; border-radius: 3px; box-shadow: none; font-size: 14px; font-weight: bold; line-height: 26px; moz-border-radius: 3px; text-align: center; text-decoration: none; text-shadow: none; width: 80px; min-height: 80px; background: url(https://artscolumbia.org/wp-content/plugins/intelly-related-posts/assets/images/simple-arrow.png)no-repeat; position: absolute; right: 0; top: 0; } .u712b6f24bba7767f7991f37c460536ea:hover .ctaButton { background-color: #34495E!important; } .u712b6f24bba7767f7991f37c460536ea .centered-text { display: table; height: 80px; padding-left : 18px; top: 0; } .u712b6f24bba7767f7991f37c460536ea .u712b6f24bba7767f7991f37c460536ea-content { display: table-cell; margin: 0; padding: 0; padding-right: 108px; position: relative; vertical-align: middle; width: 100%; } .u712b6f24bba7767f7991f37c460536ea:after { content: ""; display: block; clear: both; } READ: What Do Christians Believe About Ghosts? EssayAs the narrative progresses, one sees instances of symbolic imagery beckoning the reader to engross himself or herself in the character of Uma, portraying the authors opinion that an emotional connection to the protagonist must transpire. Through the image of, a koel calling in the neem tree piercingly, questingly, over and over again (Desai 25), the reader is allowed a moment to question and consider the meaning of this symbol in the context of Uma as a character, and thereby finds themselves inadvertently, and more importantly, consciously connected to her. A similar evocation of cognizant and emotionally involving thought occurs when hurl themselves at the like heathens in the frenzy of their false religion, and die with small, piercing denotations (Desai 167). The only difference in these two quotes is that the latter one concerns an emotional connection to the novels second protagonist, Umas younger brother, Arun. The importance of these images depends not upon the actual meaning of these symbols, rather upon the realization that the understanding of these symbols requires effort and consideration. In a novel concerned with a culture differing from that of its readers, the establishment of an emotional connection becomes necessary due to the removal of the reader from the characters and text by means of cultural barriers and stereotypes. Through the incorporation of symbolic imagery the reader feels actively involved within the emotions and thoughts of the characters, and becomes much more apt at following the authors gaze, or viewpoint, than situations in which the plot lines are merely narrated (Finke 45).

Comedy Tragedy Essay

Comedy Tragedy EssayWhen you are looking for a comedy tragedy sample essay you will find that there are many of them available. You can find them on the internet as well as through school to be used as samples in classrooms.When you are selecting a tragedy sample essay you need to make sure that you look at the quality of the work. There are some of them that are very high quality and some that are not very good.The funny part about writing a tragic story is that it can get quite dark and complicated. It is a really difficult task because you have to really think of ways to bring humor into the piece. You also have to make sure that the story you are going to use is something that will stand out and tell a great story.When you are looking for a comedy tragedy sample essay you will find that there are many of them available. You can find them on the internet as well as through school to be used as samples in classrooms. You should be sure that you select the one that fits your style.T he first thing that you should do when you are looking for a tragedy sample essay is to find the story that you want to use. You need to sit down and write it out. This way you will be able to see how the whole essay should flow.When you are looking for a comedy tragedy sample essay you will find that there are many of them available. You can find them on the internet as well as through school to be used as samples in classrooms.When you are looking for this type of essay youwill want to write it in a dramatic manner. You should think of ways to make the story more interesting. You should think of ways to bring the story to life.When you are looking for a comedy tragedy sample essay you will find that there are many of them available. You can find them on the internet as well as through school to be used as samples in classrooms.