Solutions in Chemistry free essay sample

Increasing the pressure causes the solute to be increased in the solvent, because the pressure forces the remaining gases into the solute. Therefore, pressure increases the solubility of the solution. Increasing the temperature causes the molecules to gain energy; the solvent molecules contact the solute particles more frequently. Increased surface area means that more of the solute is exposed to the solvent, dissolving the solute more quickly. 2 As stated above, the combination of solvents and solutes result in a solution. The solution then has a certain concentration. There are a number of ways to measure the concentration of a solution. There is molarity, parts per million, grams per liter and percent composition. To find the molarity of a solution, you just simply divide the moles of the solute by the liters of the solvent (moles/liters). Percent composition is calculated by dividing the mass of the compound by the total mass (mass of compound/total mass). We will write a custom essay sample on Solutions in Chemistry or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page Parts per million is calculated by finding the mass of the solute in grams and dividing it by the mass of the solvent and solute in grams, and then multiplying it by one million ((grams of solute/grams of solvent+solute)*1,000,000). A certain species of crabs are kept as pets. These crabs are usually salt-water creatures. The owner must realize that this creature must live in a solution of salt water. Salt being the solute and water being the solvent. When combined, these two will make a solution: salt water. Perfect for the crab to live in. However, if the water is too salty, or not salty enough, the crab will most likely die due to the unsuitable environment. The crab can only take so much concentration of the salt water. The owner must use one of the calculations such as molarity to figure out a suitable concentration of salt water for the crab to inhabit. The crab then can survive in the salt-water environment. Another scenario may be when a mother is making lemonade for her children on a hot day; she has to know how to comprise a solution of lemonade. She must realize that lemon water is the solvent and sugar is the solute. If shes smart, shell figure out the molarity of the perfect mix of sugar and lemon water to make the finest of lemonade. 3 Solutions are everywhere, not just in a chemistry classroom. As portrayed above, these things affect everyday life. Solutions are mixes of solvents and solutes. Solutes get dissolved and solvents are the ones doing the dissolving.

Amounts, Percents, and Bases of Percent Problems

Amounts, Percents, and Bases of Percent Problems In early mathematics, students come to understand percents as an amount of the base sum of an item, but the term per cent simply means per hundred, so it can be interpreted  as a portion out of 100, including fractions and sometimes numbers higher than 100. In percent problems in mathematics assignments and examples, students are often asked to identify the three core parts of the problem- the amount, the percent, and the base- wherein the amount is the number taken out of the base by being reduced by a certain percentage. The percent symbol is read twenty-five percent and simply means 25 out of 100. It is useful to be able to understand that a percent can be converted to a fraction and a decimal, meaning that 25 percent can also mean 25 over 100 which can be reduced to 1 over 4 and 0.25 when written as a decimal. Practical Uses of Percentage Problems Percentages may be the most useful tool of early mathematics education for adult life, especially when you consider that every mall has 15 percent off and half off sales to entice shoppers to purchase their wares. As a result, its critical for young students to grasp the concepts of calculating the amount reduced if they take a percentage away from of a base. Imagine youre planning a trip to Hawaii with you and a loved one, and have a coupon thats only valid for the off-season of travel but guarantees 50 percent off the ticket price. On the other hand, you and your loved one can travel during the busy season and really experience the island life, but you can only find 30 percent discounts on those tickets. If the off-season tickets cost $1295 and the on-season tickets cost $695 before applying the coupons, which would be the better deal? Based on the on-season tickets being reduced by 30 percent (208), the final total cost would be 487 (rounded up) while the cost for the off-season, being reduced by 50 percent (647), would cost 648 (rounded up). In this case, the marketing team probably expected people would jump at the half-off deal and not research deals for a time when people want to travel out to Hawaii the most. As a result, some people wind up paying more for a worse time to fly! Other Everyday Percent Problems Percents occur almost as frequently as simple addition and subtraction in everyday life, from calculating the appropriate tip to leave at a restaurant to calculating gains and losses in recent months. People who work on commission  often get around 10 to 15 percent of the value of the sale they made for a company, so a cars salesman who sells a one hundred thousand dollar car would get between ten and fifteen thousand dollars in commission from his sale. Similarly, those who save a portion of their salary for paying insurance and government taxes, or wish to dedicate part of their earnings to a savings account, must determine which percentage of their gross income they want to divest to these different investments.

Mexico CitysTlatelolco Massacre

Mexico City'sTlatelolco Massacre One of the ugliest and most tragic incidents in the modern history of Latin America took place on Oct. 2, 1968, when hundreds of unarmed Mexicans, most of them student protesters, were gunned down by government police and Mexican army forces in a gruesome bloodbath that still haunts Mexicans. Background For months preceding the incident, protesters, again most of them students, had been taking to the streets to bring the attention of the world to Mexicos repressive government, led by President Gustavo Diaz Ordaz. The protesters were demanding autonomy for universities, the firing of the police chief and the release of political prisoners. Dà ­az Ordaz, in an effort to stop the protests, had ordered the occupation of the National Autonomous University of Mexico, the countrys largest university, in Mexico City. Student protesters saw the upcoming 1968 Summer Olympics, to be held in Mexico City, as the perfect way to bring their issues to a worldwide audience. The Tlatelolco Massacre   On the day of Oct.2, thousands of students marched throughout the capital, and around nightfall, about 5,000 of them congregated at La Plaza de Las Tres Culturas in the district of Tlatelolco for what was expected to be another peaceful rally. But armored cars and tanks quickly surrounded the plaza, and the police began firing into the crowd. Estimates of casualties vary from the official line of four dead and 20 wounded into the thousands, although most historians place the number of casualties somewhere between 200 and 300. Some of the protesters managed to get away, while others took refuge in homes and apartments surrounding the square. A door-to-door search by authorities yielded some of these protesters. Not all of the victims of the Tlatelolco Massacre were protesters; many were simply passing through and in the wrong place at the wrong time. The Mexican government immediately claimed that security forces had been fired upon first and that they were only shooting in self-defense. Whether the security forces fired first or the protesters incited the violence is a question that remains unanswered decades later. Lingering Effects In recent years, however, changes in government have made it possible for a closer look into the reality of the massacre. The then-minister of the interior, Luà ­s Echeverrà ­a Alvarez, was indicted on genocide charges in 2005 in connection with the incident, but the case was later thrown out. Movies and books about the incident have come out, and interest is high in Mexicos Tiananmen Square. Today, its still a powerful subject in Mexican life and politics, and many Mexicans see it as the beginning of the end for the dominant political party, PRI, and also the day the Mexican people stopped trusting their government.

Can social psychology save humanity Discuss Essay

Can social psychology save humanity Discuss - Essay Example Myers also points how â€Å"materialism† and â€Å"consumerist culture† can never provide lasting peace for its pursuers. Myers asserts that material affluence can at best give a temporary surge of happiness. What would give lasting happiness are the following - loving close relationships, adherence to a religious faith, a positive outlook, a stress-free work environment, etc. In effect, a low consumption, non-materialistic way of life could fetch more happiness for the individual and the group. The theory is backed by plenty of statistic. Several surveys have shown that married people are happier than those who are single; more church-goers find inner harmony than non-believers; those involved in community activities find more satisfaction than the rest (Yang, Kleinman, et al., 2007). It is important to recognize the current prevalence of misery and distress across the globe. Statistics show that the financially well-off are only marginally happier than their poorer compatriots. It means that additional wealth that is not essential for survival provides disproportionately low value. The recent decades had seen an increase in the cases of depression and suicide. While societies are getting more affluent, the distribution of wealth remains highly uneven. For example, the gap between the rich and poorer sections of society is wider than ever before. The percentage of people living in poverty had not changed much. Life-threatening epidemics such as malaria and AIDS are rampant in the third world. Teenage suicide rates are at an all time high. Violent crimes have not abated despite legislation to curb them. A large chunk of humanity does not even have access to basic amenities like clean water, electricity and telephone facility. All of the above conditions paint a da rk and discouraging picture of the present human condition. But all is not lost.

Jennifer Weltz Discussion Board Coursework Example | Topics and Well Written Essays - 250 words

Jennifer Weltz Discussion Board - Coursework Example The background image of an open book and presentation of various authors work is informative on the role of the corporation. Furthermore, the placement of functional hyperlink at the top region of the website makes navigation easy. In addition, the information about presented on the website is appropriate for the purpose of the website. Consequently, this among other reasons brings out the purpose of the website. 1. As the president of JVNLA, an organizational that has sold books domestically and internationally for almost two decades, I would like to know what do you look for in an author’s work that makes JVNLA what it is today (Our Team: Jennifer Weltz )? 3. With regard to your speech to the Historical Novel Society Convention that was held in San Diego, Madam President I quote â€Å"†¦I try to help my authors receive what they need to make their books reach their highest potential†. To me this implies that you have a commanding knowledge in realizing what it takes one to be the best author. Do you have any plans to nurture potential authors

Graduation Speech -- Graduation Speech, Commencement Address

"Some people come into our lives and quietly go. Some stay for a while And leave footprints on our hearts And we are never the same again." As I prepared this speech, this quote came to mind as I realized how many of you have left footprints on my heart over the past four years. I have may wonderful memories that I will cherish forever. I remember embarrassing moments when a teacher misunderstood what I said, and then my classmates teased me mercilessly. I remember a time in math class when a student fell asleep and was tied to his chair and chalk dust was thrown all over him. I remember teepee wars and dissecting old smelly eyeballs and cute little minks in biology, staying up all night to finish thesis papers, and taking endless flashcard quizzes. I remember when I was in the hospital my friends visited me and cheered me up. I remember crying together when a coach and two of our peers passed away. We have definitely been through a lot together. But tonight is not only a celebration of the end of high school, it is a celebration of the beginning of our future. Today is the first day of the rest of our lives. Yesterday is not ours to recover, but tomorrow is ours to win or lose. We, the Class of 2006, have chosen "Change The World" as our graduation theme. I think this is the perfect choice for our class, because we will do just that. Our class is very special. We have been leaders in every aspect of our school. Among us are talented athletes, musicians, scholars, artists, actors and actresses. We are skilled in business, family science, agriculture, horticulture, foreign languages, computers, technology, and many other areas. None of us, of course, are good at all of these things, but we are all good at something. Ma... ...odness I'm not a clam or a ham Or a dusty old jar of gooseberry jam! I am what I am! What a great thing to be! If I say so myself Happy every day to me!" We are each unique and have different goals and aspirations. But whether we become a social worker, doctor, auto mechanic, or a politician, we can influence the lives of others in a positive way. Each small thing we do, even just a simple smile or pat on the back, can make a difference to one person. And when we do this daily at school or work or in our family, we are slowly changing our homes, neighborhoods and communities. In the year 2007, at our ten-year reunion, I would like each of us to be able to share how we have left our footprints on the hearts of those around us, and thereby made a difference in our community. We will be able to see how the Class of 2006 has united to change the world.

Bead Bar Network Paper

Bead bar specializes in making beads jewellery for the customers. They have three divisions’ namely studios, franchises and bead bar on board that requires to be connected for synchronization of activities. It is required to create a network design and the appropriate topology which would be of good to the company for communicating the requirements and sharing information to keep in synchronization with the current state of the business.The network topology would be discussed which would make the communication feasible and possible with regard to all the physical and network barriers.The network design is the architecture which would give a clear picture of the interconnection of devices and the departments to facilitate the sharing of business information. The final section discusses the pros and cons of the proposed topology in question. Background information of Bead Bar: Bead Bar as an organization is departmentalized into three divisions namely studios, franchises and bea d bar on board. The present situation does not create a network among the divisions and thus creates inconsistencies in information sharing and knowledge about the company as a whole, at any given point of time.A computer network would facilitate the process of getting the entire job done for every customer at a lesser time than usual. It would make sure that information regarding ones choice and preferences would be catered and stored for future benefits. The network would enrich the communication among the divisions which in turn would facilitate greater workability and functionality in operation. Recommendation overview: The network recommendation for the Bead Bar could be capitulated into LAN and WAN.The internal network within the divisions would have a LAN network; however the inter-department communication would be made possible using WAN. Creating a LAN would create an internal network which can be made possible for connecting the personnel in the very department itself. For the LAN network, switches and hubs are used for connecting the sole division itself and for WAN routers are used for interconnecting each other. Explanation of the Network Design: All the three divisions of the company are interconnected using the network cable in a wired network using both LAN and WAN.Using LAN the computers are interconnected within the office or building premises so that all the employees are able to get information on demand. The head office has a central server where all the information us stored in the database. The other offices are also networked using the LAN technologies. The switch is two layered and used to take care of the storing and forwarding mechanism as stated in Tanenbaum (2003). Using WAN the network connections are using the public data services and get connect to internet and using VPN technology, using login credentials.Network Topology: The LAN technology follows a star topology with hubs. The interconnecting devices used facilitate the use and share of information. The hubs are used to store and forward the information. Star topology is used which would facilitate the efficient use of network resources (Star Topology). Advantages of the architecture: †¢ Having a star topology would make it less expensive in relation to mesh topology. †¢ In a star, each device needs only one link and one I/O port to connect it to any number of other devices (Forouzan, 2003).†¢ It makes the star topology easy to install and reconfigure with time and need. †¢ Star topology requires far less cabling and any additions, deletions and moves involve only one connection between that device and hub. †¢ It is quite robust in nature; if one link fails the others do not cease to operate. This factor also enhances the fault identification and fault isolation. †¢ As long as the hub is in working condition, it is quite easy to monitor link problems and bypass defective links. †¢ A WAN is used for connecting to the i nternet so as to get connected with the other departments across geographic locations.†¢ VPN technology is used to validate the user of the network so that the connection established is secure in nature. It would use the login name and password facilities to enable a secure way of handling data. †¢ A database server is used so that all the information is stored centrally and all the users access the information using their credentials. †¢ The VPN also makes sure that not all users would be able to access all for ms of data an data security and integrity is restricted using the login credentials. Drawbacks of the architecture:†¢ The VPN technology would be quite expensive to implement (VPN). †¢ The cost of switches and hubs would be costly. †¢ The use of websites where all the computers are used for accessing directly the internet would have made the architecture more accessible but security would have been less. Even the cost of web server would be incu rred quite high. Conclusion The primary objective to connect has been taken into account and the network topology has been discussed to give shape to the entire network for interconnecting with the various divisions in the company.The network architecture and the drawbacks associated with it are thoroughly examined for its feasibility and communication. The network topology would have an upper hand on the drawbacks and is quite sufficient to inter-connect the enterprise to capitalize on its resources. References/ Bibliography Forouzan A. Behrouz (2003). TCP/IP Protocol Suite, second edition. Tata McGraw Hill. Physinfo (2006). Network Topologies. Retrieved October 26, 2007 from http://physinfo. ulb. ac. be/cit_courseware/networks/pt2_1. htm