Investigating Stoichiometry Essay Example for Free

Investigating Stoichiometry Essay Quantitative Data: The table shows the mass of reactants potassium iodide and lead(II) nitrate, and the mass of the precipitate from the reaction between KI(aq) and Pb(NO3)2(aq). Mass of precipitate from reaction between KI(aq) and Pb(NO3)2(aq) Mass of potassium iodide (à ¯Ã‚ ¿Ã‚ ½0.001g) 1.701 Mass of lead(II) nitrate (à ¯Ã‚ ¿Ã‚ ½0.001g) 1.280 Mass of filter paper (à ¯Ã‚ ¿Ã‚ ½0.001g) 0.798 Mass of precipitate + filter paper (à ¯Ã‚ ¿Ã‚ ½0.001g) 2.525 Mass of precipitate (à ¯Ã‚ ¿Ã‚ ½0.001g) 1.727 Qualitative Data: 1) After pouring the KI(aq) and Pb(NO3)2(aq) solution together into the beaker, a glass rod was used to stir the solution so as to make sure it was mixed properly. However, after stirring, when the glass rod was taken out, there were small amounts of precipitate (PbI2(s)) stuck onto the glass rod, and could not be removed. 2) While pouring the remaining mixture into the filter paper, not all the mixture was poured into the filter funnel and paper. Some of the mixture was stuck in the beaker even after trying to wash it down water and scooping it out with the glass rod. 3) After filtrating the mixture, it was observed that there were some parts of the filtrate that was still yellow in colour, with some PbI2 crystals floating around, which meant that some of the residue (PbI2) passed through the filter paper. Even so, another round of filtration was not carried out. The chemical equation obtained from the reaction above: 2KI(aq) + Pb(NO3)2(aq) 2KNO3(aq) + PbI2(s) Step 1) Using stoichiometry, predict the mass of PbI2(s) formed when a solution containing 1.701g of KI(aq) is mixed with a solution containing 1.280g of Pb(NO3)2(aq): First, the limiting reagent is determined by finding out which reagent produces lesser moles of PbI2. Using Pb(NO3)2: Moles of Pb(NO3)2 = 1.280g Pb(NO3)2 x = 0.0038646176mol Pb(NO3)2 Moles of PbI2 = 0.0038646176mol Pb(NO3)2 x = 0.0038646176mol PbI2 Using KI: Moles of KI = 1.701g KI x = 0.010246988mol KI Moles of PbI2 = 0.010246988mol KI x = 0.005123494 mol PbI2 ?Pb(NO3)2 is the limiting reagent. Second, we predict the mass of PbI2 formed. Mass of PbI2 = 0.0038646176mol PbI2 x = 1.781550067g PbI2 à ¯Ã‚ ¿Ã‚ ½ 1.782g PbI2 Step 2) Now we calculate the actual mass of PbI2 formed. Mass of filter paper = 0.798g Mass of precipitate (PbI2) + filter paper = 2.525g Mass of PbI2 produced = 2.525g 0.798g = 1.727g Step 3) Now we calculate the percent yield. Percent yield of PbI2 = PbI2 x 100% = 96.91358025% à ¯Ã‚ ¿Ã‚ ½ 96.9% Analysis of Results After conducting the experiment, it is found that the percent yield of PbI2 produced was 96.9%, which was rather accurate. However, it was lower than the predicted mass by 3.1%, which could be due to the qualitative results shown above, random errors and inaccuracy of the experiment. When stirring the KI(aq) and Pb(NO3)2(aq) solution, some of the PbI2 precipitate was stuck onto the glass rod used for stirring, and could not be removed without using fingers, which would have contaminated the solution. This resulted in the decrease in the actual mass of PbI2 precipitate measured, causing the percent yield to be slightly lower than the predicted yield. When pouring the mixture into the filter funnel, not all of the mixture was poured into the filter paper as some of it was stuck inside the beaker. Even though water was used to wash some of the mixture stuck in the beaker into the filter paper, not all of the mixture was filtered. The mixture stuck in the beaker and was not filtered would have decreased the percent yield. Finally, when the mixture was being filtered, some of the PbI2 precipitate passed through the filter paper and went into the filtrate. The filtrate was not filtered again, so some of the PbI2 was not calculated into the final mass of PbI2 produced. This would have decreased the percent yield as well. All the above would have contributed to the fact that the percent yield was 3.1% lower than the predicted yield. Conclusion The results from the experiment showed that the percent yield of PbI2 is 96.9%, which is rather accurate. However, due to random errors and the qualitative results shown above, the percent yield is 3.1% lower than the predicted yield. Limitations and Improvements If I could do the experiment again, As some of the precipitate was stuck onto the glass rod and could not be removed by using my fingers, I could have just used a little bit of water to wash it down back into the mixture. This would have decrease the difference in the percentage between the predicted yield and the percentage yield. Even though water was used to wash some of the mixture into the filter funnel, there was still some mixture stuck in the beaker. The process of using water to wash down the mixture could have been repeated over and over until all the mixture is in the filter funnel. After filtrating the mixture once, some of the PbI2 crystals went through the filter paper and into the filtrate in the conical flask. To make sure all the PbI2 precipitate is counted towards the percent yield, the filtrate could have been filtrated again at least 2 more times. This would have increased the mass of PbI2, which would have made the percent yield closer to 100%.

Social Status and Feminism in The Great Gatsby Essay -- Feminism Femin

F. Scott Fitzgerald's novel, The Great Gatsby may appear to be a simple tragic romance; however, within the text, Fitzgerald identifies and defines social gaps and importance of wealth. He also presents women within a very separate space as the men. The Great Gatsby allows the reader to enter into the world of wealth and experience the joys and tragedies of being within this certain class as well as allowing the reader to interpret the position of gender inside the class. "Whenever you feel like criticizing anyone,' he [my father] told me, "just remember that all the people in this world haven't had the advantages that you've had" (Gatsby 1). This quote was possibly the backbone of the narrator's actions and character. Through out the novel, the characters that he came into contact with were immediately associated with their money and their association with their given level of wealth. The irony of this opening line is that the poor, or less wealthy, were never really even seen by the narrator. The only people that the narrator saw, according to the reader, are the more wealthy and upper class that were associated with Gatsby's parties. What is even more ironic than the overall absence of the lower classes within the novel is where this neglected level of wealth actually did become part of the novel. Ironically, the only character that lower wealth was associated with was Gatsby. In his past, he was of lower class, but in the actual time when the novel was written, Gatsby was not only representative of wealth, but he seemed to have had the most wealth of all the characters. He was the most prestigious when compared to all of the other characters, yet was the only to have the absence of money in his past. The quote in the p... ...lar practices and thoughts, or he completely redefined them. By doing so, the novel takes on a new identity separate from its tragic romantic cover. Social status and feminism tower over the lost and found love that encompasses this novel.    Works Cited and Consulted: Bewley, Marius. â€Å"Scott Fitzgerald’s Criticism of America.† In Modern Critical Interpretations: The Great Gatsby. edited by Harold Bloom. New York: Chelsea House Publishers. 1986. 11-27. Fetterley, Judith. The Resisting Reader: A Feminist Approach to American Fiction. Bloomington: Indiana UP, 1978. Fryer, Sarah Beebe. Fitzgerald's New Women: Harbingers of Change. Ann Arbor, MI: UMI Research P, 1988. McAdams, Tony. â€Å"Ethics in Gatsby: An Examination of American Values.† In Readings on The Great Gatsby. edited by Katie de Koster. San Diego, California: Greenhaven Press. 1998. 111-120. Social Status and Feminism in The Great Gatsby Essay -- Feminism Femin F. Scott Fitzgerald's novel, The Great Gatsby may appear to be a simple tragic romance; however, within the text, Fitzgerald identifies and defines social gaps and importance of wealth. He also presents women within a very separate space as the men. The Great Gatsby allows the reader to enter into the world of wealth and experience the joys and tragedies of being within this certain class as well as allowing the reader to interpret the position of gender inside the class. "Whenever you feel like criticizing anyone,' he [my father] told me, "just remember that all the people in this world haven't had the advantages that you've had" (Gatsby 1). This quote was possibly the backbone of the narrator's actions and character. Through out the novel, the characters that he came into contact with were immediately associated with their money and their association with their given level of wealth. The irony of this opening line is that the poor, or less wealthy, were never really even seen by the narrator. The only people that the narrator saw, according to the reader, are the more wealthy and upper class that were associated with Gatsby's parties. What is even more ironic than the overall absence of the lower classes within the novel is where this neglected level of wealth actually did become part of the novel. Ironically, the only character that lower wealth was associated with was Gatsby. In his past, he was of lower class, but in the actual time when the novel was written, Gatsby was not only representative of wealth, but he seemed to have had the most wealth of all the characters. He was the most prestigious when compared to all of the other characters, yet was the only to have the absence of money in his past. The quote in the p... ...lar practices and thoughts, or he completely redefined them. By doing so, the novel takes on a new identity separate from its tragic romantic cover. Social status and feminism tower over the lost and found love that encompasses this novel.    Works Cited and Consulted: Bewley, Marius. â€Å"Scott Fitzgerald’s Criticism of America.† In Modern Critical Interpretations: The Great Gatsby. edited by Harold Bloom. New York: Chelsea House Publishers. 1986. 11-27. Fetterley, Judith. The Resisting Reader: A Feminist Approach to American Fiction. Bloomington: Indiana UP, 1978. Fryer, Sarah Beebe. Fitzgerald's New Women: Harbingers of Change. Ann Arbor, MI: UMI Research P, 1988. McAdams, Tony. â€Å"Ethics in Gatsby: An Examination of American Values.† In Readings on The Great Gatsby. edited by Katie de Koster. San Diego, California: Greenhaven Press. 1998. 111-120.

Autobiography

My name is Andrew Windiest, I was born in Redding, California, a mid-sized city located in the most northern part of the Sacramento Valley. I have four brothers named Alex (14), Jordan (21), Nathan (25), and Tyler (28) along with two sisters, Courtney (29) and Samaritan(26). My Dad's name is Neil Windiest (60) and my Mom's name is Katharine Buchanan (49), they were never married and I don't remember them ever being together. Vie grown up most of my life in Dixon, CA where my mom lived up until three years ago when she moved to Elk Grove. Most of my friends that have known me since I was really young are in Dixon.My dad lives in Red Bluff, CA, up near Redding and that's where I spend most of my time right now. In the future I hope to get out of the valley, although I like some areas of it, I like mountainous areas a whole lot more. I am now attending Elk Grove Charter School as a senior and hope to gain on all my missing credits and graduate this year. I really enjoy the outdoors and it is where I like to spend my time whenever I get the chance. I love fishing and would fish everyday if I could, I have spent many, many hours on the river enjoying the peacefulness. Another thing I enjoy is working on cars, particularly my own.I like high performance cars and love the freedom of driving. I enjoy hiking mountains a lot and like adventures. I climbed Met. Lessen Peak when I was six years old. My Dad has a house on the Oregon coast in Coos Bay. We go up there and ride the sand dunes and it's a lot of fun. My dad bought me my first car it's a eagle's Talon. My dad has had two of these cars previously except his were all wheel drive. These cars have lots of horse power for how big the engine is because they are turbocharged. This a short story of my previous life and my life now and I hope to add many more memories to my life story. Autobiography I attended La Immaculate Primary School, Muffles College High School graduating with a Diploma in Academic Business, Muffles Junior College graduating with an Associate Degree in General Studies, university of Belize graduating with a Bachelor f Science Degree in English Education, and presently studying at Galen university to acquire a Master's Degree in Business Administration. I have always been a rather quiet individual at home, at work, and at school. Accustomed to being around primarily adults, I am mature for my age and most of my friends are males.My hobbies are reading, cooking, baking, and listening to music. Occasionally, I watch some television if I am bored. I did well in school, as I always read ahead and researched even before school opened. I spent my vacation reading all my school codebooks and highlighting the information I deemed Important, while my friends spent theirs traveling or enjoying themselves. In College, I used to spend more time with my friends. We woul d play cards and dominoes and eventually I became a great domino player.I have been encouraged to enter competitions, but I just play for the center of attention. I am more of a behind the scenes type of person, preferring to observe than step to the forefront. I was never one who saw myself with a family and did not want to be tied down by the constraints of a husband and children. Although I absolutely adored children, I assumed I'd never have any children or marry. However, as I grew older my mentality changed and I met someone whilst studying for my Bachelors.After three years of dating, I had a daughter. Shortly after the birth of my daughter, due to an accident, my partner died and I ended up becoming a single mother at the age of 21 . I found myself balancing being a mother, studying and working, always looking for a better job so to make more money to give my daughter a better life than I had. I'm proud to say this new role suits me. I'm driven, not only to do great things f or myself, but to spur my daughter on to even greater ones.What I achieve in life, I do it for my daughter. I do not consider myself a genius, but I study hard or seek help when I need it. I always attempt tasks first and then seek help when I realize that I really do not know what I'm doing, or I cannot do it on my own. I still have that independent nature strongly embedded. Presently, my goal is to graduate with honors and obtain a scholarship for a PhD. Furthermore, having met someone and getting engaged, I look forward to marrying and having two more children. Autobiography Inspirations come from many avenues. My inspiration came when I was 16 years old in the form of a 3 pound baby boy measuring the length of a ruler. Being a young adolescent myself, this was a very trying time for me. My son was born almost three months early and could very easily have not survived. The birth of my first child is what changed my life forever and shaped me into the person I am today.At the age of seventeen I was attending high school, being a mother to my son, and working away from home as a waitress; all the while missing my little boy beyond words. I knew right then what I wanted to do with my life. I wanted to watch my son grow. I wanted to not only be his mother but also his teacher.As my life moved forward my family grew. I was lucky enough to have the privilege to stay at home with my children. During this time I decided that caring for children and helping them grow was what I wanted to do. I started doing child care for a few of my friend’s children and absolutely fell in love with it. This is what I have always done and is something that has always come completely natural to me. Being responsible for a child’s growth while watching them learn and mature right before my eyes is an amazing feeling and a blessing.My children are now all in school full time which has me feeling ready to share the passion I have in caring for, nurturing, and teaching children with others. After I complete my CDA coursework my goal is to become a preschool teacher. I feel with current education with child development and the love I have for watching children’s developmental growth this will be a great future for me.

Characteristics Of A Social Worker s Identity Essay

Value systems are crucial in constructing a social worker’s identity. They facilitate how approaches social justice issues. Values and ideologies construct social problems but also social responses. Social workers must assess values that shape the intervention process as this will influence the type of social change made. As a critical social worker, I will operate on the core value of non-judgment which is align with the social work code of ethics, history and mission statement. Theories emerged in social work due to a shift from a subjective to objective approach involving scientific philanthropy (textbook). It provides objectivity when dealing with a client’s situation which is align with the core value of non-judgment in practice. A social work theory tries to explain and make predictions about a phenomenon (lecture). The ecological theory, a conventional approach, places individuals at various levels of impact. This theory tries to understand the relationship between people and their environment (Textbook). Social workers who use this perspective, incorporate empathy and reflection in their practice. It will aid in sorting emotions from logic in the intervention process (lecture). The structural theory, a progressive approach, focuses on the non-visible structural elements such as social class, race, and gender. One can go beyond the analysis of the intermediate family and community, and focus on socio-economic factors (textbook). It helps to see the concept ofShow MoreRelatedRace And Ethnicity : Biological And Sociological Factors980 Words   |  4 Pagesphysical characteristics (which usually result from genetic ancestry). Race presumes shared biological or genetic traits, whether actual or asserted and the category to which others assign individuals on the basis of physical characteristics. Races are assumed to be distinguished by skin color, eye color or hair type. 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