Why Oil and Water Dont Mix

Why Oil and Water Dont Mix You may have experienced examples of how oil and water dont mix. Oil and vinegar salad dressing separate. Motor oil floats on top of the water in a puddle or in an oil spill. No matter how much you mix oil and water, they always separate. Chemicals that dont mix are said to be immiscible. The reason this happens is because of the chemical nature of oil and water molecules. Like Dissolves Like The saying in chemistry is that like dissolves like. What this means is the polar liquids (like water) dissolve in other polar liquids, while nonpolar liquids (usually organic molecules) mix well with each other. Each H2O or  water molecule is polar because it has a bent shape in which the negatively charged oxygen atom and the positively charged hydrogen atoms are on separate sides of the molecule. Water forms  hydrogen bonds between oxygen and hydrogen atoms of different water molecules. When water encounters nonpolar oil molecules, it sticks to itself rather than mingles with the organic molecules. Making Oil and Water Mix Chemistry has tricks for getting oil and water to interact. For example, detergent works by acting as emulsifiers and surfactants. The surfactants improve how well water can interact with a surface, while the emulsifiers help oil and water droplets mix together. Density and Immiscibility Oil floats on water because it is less dense or has lower specific gravity. The immiscibility of oil and water, however, is not related to the difference in density.

Valedictory Speech Essay Example

Valedictory Speech Essay Example Valedictory Speech Paper Valedictory Speech Paper We studied in Great Mercy Academy so we could be equipped with adequate knowledge and skills in preparation for important roles we have to play in society someday, and most specially, to turn into reality the prophecy of our national hero, that we, indeed can be the hope of our beloved country, The Philippines. Now, I could simply say that we are empowered and productive student that could face new challenges towards new horizon. For I believe, that we are now equipped of all the things we need based from the experiences and trainings we had undergone from our Alma Mater. My dear co-graduates, the first step has men successful. Aka nag, the roots of education is bitter, but the fruit it bears IS very sweet. The journey is long and laden with thorns but our accomplishments in this school are very rewarding. The patience and dedication each of us has shown throughout our 6 years in the elementary are those what made us heroes like Jose Racial. Our graduation today is the first of the series of accomplishments that we will surely achieve with the guidance of our parents and people around us. Everything in this world has a beginning. In our case, we have just accomplished the beginning. We have started the first right move. Hence, there is no reason why we should fail in our future undertakings. Of course, we will not have been able to reach this stage without the people who helped us and who, without any reservations and expecting nothing in return, guided us in our quest for knowledge. To them, we owe a lot of gratitude. No amount of words can fully express how much we appreciate what they have done for us. We just hope that we will be able to compensate for all their sacrifices. To our dear teachers who taught us not only the lesson in the book but also taught us lessons in real life, we are most thankful to Mrs.. Angelina Leafy, our adviser who is very supportive to us; Mr.. Keen Garcia who molded our hidden talents into reality, especially in dancing; Ms. Jocosely Descartes, our Home Ionics teacher who taught us the basics of home life; Ms. Connie Jimenez, our Science and MARE teacher who supported us since we were grade 5 until our graduation today; Mrs.. Emily Castro, our Filipino teacher who guided us in our studies and to Ms. Lira Christie Omaha, the lovely teacher of Naps. We are very thankful to all of you. To our parents, who are always beside us since our first day in school, w share with you our first taste of victory. There will be more years of struggle. But we are confident that we will triumph because we have parents like you. We cannot give financial or material things at this point. We can only give you the joy, happiness, and respect that you deserve. Thank you for being responsible parents to us. We shall not be here in this worlds without you. We know the sacrifices you made just to send to send us to school. To this, we are very grateful. To papa and Mama, Tatty. Anovel, mommy, please raise. I have witnessed your sacrifices and struggles in rearing me. Thank you very much. High school life is the first step in our ladder of success. We do not know what will happen next. But if we have an aim, a goal, it will make our dreams come true.

UNIQLO Japan Assignment Example | Topics and Well Written Essays - 500 words

UNIQLO Japan - Assignment Example UNIQLO Company first established its operations in Tokyo area, and soon expanded its business premises to Osaka and other areas of Tokyo (Haghirian, 2009). The company has since improved its operations in Japan and its surroundings as it expands to other nations in the globe. Therefore, the company became known for domestic and holding enterprise that operates to attain various goals and objectives of the company. This has helped the company increase its marketing department and stores to establish other companies of the same brand in other nations (Hasegawa, 2011). It is thought that UNIQLO Company is among the top ten companies considered specialists in retail that is fast in the world market. Internationally, the company has ensured employees in various organizations experience an environment that is favorable for effective and efficient work. This has been found to encourage employees work happily and become more innovative in diverse fields they are working under in the company (Plunket Research Ltd, 2008). The company has also tried to ensure there is a high growth and improved quality of goods and services offered by the company. This has ensured various companies attain requirements of individuals from various communities, backgrounds, nations and ethnic groups. This helps improve standards of living among individuals from various nations. The success of the company has been based on good governance that has been experienced in the organization, and location of the business premises in diverse nations. Strategic placement of companies has been found to influence the success of the company. The company has established its companies in other nations like China, where the processes of growth of the company have been attained successfully. This has been influenced greatly by global market as there is a need to meet changes in technology and the market.

Ubuntu Operating System Assignment Example | Topics and Well Written Essays - 1250 words

Ubuntu Operating System - Assignment Example Ubuntu also gives one the security and comfort in working and storing information online, since it has a password to unlock the administrative actions of one's documents. The password protects against superfluous persons from interfering with the documents. The constantly changing versions of Ubuntu make it a striking technology to apply. Ubuntu Operating System is the newest version of a computer operating system built to cater to the immense role computer plays on man’s daily activities. The system offers new features to its users and improves on their daily know-how in the computer world. Ubuntu is described as a computer structure based on the ‘Debian GNU/Linux distribution’. This unit analyses history, features installation, packages, variants, editions and quality of Ubuntu operating system in detail. Ubuntu was developed as a result of the need of having an efficient system. The earlier systems were not efficient to do the multitasking task, which involved a user performing similar tasks at once. The first version of Ubuntu to be released for public use was on 20th October 2004. Various versions of the Ubuntu system are launched after eighteen months to advance on the effectiveness of the structure. The new versions of the system help in maintaining safety, thus preventing unwanted viruses. The Ubuntu system is being sponsored by Canonical Ltd and a well-wisher named Mark Shuttleworth. The sponsor’s donations led to the formation of the Ubuntu foundation whose main function was to support the development of the latest Ubuntu versions. The features of Ubuntu are that; it is composed of different software packages like the free software. Ubuntu’s design allows it to focus on usability, safety, and dependability.

Future of technology (advantages and disadvantages) Essay Example for Free

Future of technology (advantages and disadvantages) Essay From day to day, our world has been changed gradually from one condition to another. Nowadays, technology has advanced in huge leaps and bounds. We cannot imagine the world without technological advances such as computer, televisions, and machines and so on. However there are some advantages and disadvantages of technology. First, technologies play an important role in society because it makes life easier to live on and makes time less consuming. People do not have to do all the hard labor anymore. For example, many people have washing machines, clothes driers and dishwashers, so the amount of energy needed to wash and dry clothes and wash dishes is greatly reduced. Second, medical science is very progressive and saves many innocent lives. Medical treatment has been going well with the help of technology. Nowadays, hospitals use technology as assistance for operations. However, technology also brings harm to our society. The overuse and development of factory industries causes pollution to our world. For example the use of cars and machines causes smoke that affects the quality of our air and destroys our ozone layer and as a result people suffer illnesses like cancer. Another disadvantage is that technologies create financial problems in families because most technologies are expensive. For example people that do not have a washing machine will have to wash clothes by hand which is time consuming. In conclusion, we cannot stop technology from developing in our society. Nowadays, we as people rely on technology everyday to make our lives simpler. Without modern technology our world would be a tough place to live in.

Influenza Fever :: Journalism Media Studies Ireland Health Essays

Influenza Fever DUBLIN, Ireland--It seems as though this year is not a good year for people as we have the big war going on and at home, people are stuck with a disease that the doctors do not know how to make it stop spreading. The epidemic has reached a boiling point as everyone is affected by this disease and it does not matter whether the person lives in Dublin, Ireland or Frankfurt, Germany, the disease still spreads. People dreaded to hear that they have been infected by that disease, they do not want to hear "influenza" is the disease that they are suffering from. Although the government has put out public notices that the disease is not infectious and tells people of ways to prevent as well as detect the disease, people are still afraid of it. They are in a state of panic as they are trying any means to protect themselves from having the disease. They are even gullible [enough] to believe that a certain type of nutrition tablet could help them to maintain vitality in their system so that [they] could effectively resist the influenza organism. Although, no one really knows how to cure the disease and certainly no one knows what makes one have it and one not, people are still flocking to the store to buy one of these so-called "nutrition tablets". However, this is not the worst case that I have seen since arriving at the infected city of Dublin as this latest trend will boggle anyone who has a sensible mind. A water company has advertised that people should not drink normal water because normal water has micro-organisms that will lead to influenza and only their brand of water is clean and pure and guaranteed to be free from any bacterial impurities. People are lining up at the store that I just passed by to buy the water from this company. Although I think that most of these advertisements about ways to not get influenza are scams, I cannot blame them for thinking that way. The influenza epidemic not only affected the children but also the economy as workers are infected by the disease. In a boot factory where before at lunch time one could see a bunch of girls and women come out taking their lunch break, the factory is now almost empty.

Homeostasis Essay

What is homeostasis? Homeostasis is the mechanism in our body that regulates and maintains a stable and constant environment. This enables our body to respond to changes in the environment around us as. The homeostatic mechanisms in our body, observe and monitor conditions and will then make a judgment whether to change the way the body functions is order to adapt to the outside surroundings better. The main organs involved in homeostasis are; the brain, liver, skin and kidney’s. The skin is involved as its acts as a protective layer and also regulates body temperature. The liver breaks down harmful substances and the kidneys regulate water levels and waste products. In the brain the hypothalamus controls everything and changing them to fit into the outside surroundings. Negative feedback is also linked in as it is the process of homeostasis. It is negative because it is in a negative situation and will not kick it unless there’s something wrong. Body temperature When we exercise the body has to work harder, the body temperature would increase this is due to organs having to work harder to get oxygen to muscles. The metabolic rate that produces more energy has to increase in order for more energy to be released. The heart has to pump more blood around the body in order to deliver oxygen to the working muscles so they can carry on working at that capacity. What mechanisms are there to cool the body down? Sweating-glands are stimulated to release sweat Liquid turn into gas Vasodilation-your body carries most of the heat energy around your body There are capillaries underneath your skin that can be filled with blood if you get too hot This brings the blood closer to the surface of the skin so more heat can be lost, this is why we look red when we’re hot. What mechanisms are there to warm the body up? Vasoconstriction-this is the opposite of vasodilation The capillaries underneath your skin get constricted (shut off) so less heat is lost Piloerection- this is when the hairs on your skin stand up The hairs trap a layer of air next to the skin which is then warmed by the body heat. Heart rate The heart rate is controlled by the autonomic nervous system. This system however, is split into two, the sympathetic nervous system and the parasympathetic system. The sympathetic system is in charge of speeding up the heart rate when it’s needed and the parasympathetic system is there to slow the heart rate down. There are many reasons why heart rate could increase; the main and obvious reasons are fear, stress and exercise. Exercise is one of the main reasons why heart rate would increase as when we exercise we need more oxygen to travel to our working muscles. Oxygen is only carried in the blood and the main organ for the blood pumping around the body is the heart. This is when the sympathetic nervous system comes in; the receptors tell the brain that we are doing exercise and then the brains sends a message to the heart to pump faster, in order for more oxygen to be transported in the blood to the working muscles. When we are not doing exercise we have a ‘pace maker ’ of the heart. This ‘pace maker’ called the Sino atrial node keeps a regular heart beat. We have tested our Sino atrial node by first of all doing exercise to see our risen heart rate, mine was 13. After 5 minutes of rest our Sino atrial node should have kicked in and our regular heart beat will be taking place, mine was now 11. The negative feedback system Change in the body’s external environment, the brain receives a message – exercise Change in body’s internal system Receptors detect change and send messages to the brain The brain organises internal and external body changes to bring the environment back to normal Breathing rate Breathing rate is determined by the amount of breaths taken during a certain  period of time. This can increase during exercise or any physical activity or trauma. The way in which the body recognises this is by the chemo-receptors. They send a message to the brain, which then sends a message to the heart to pump more blood by beating faster, this is because they have detected a change in the amount of carbon dioxide that is circulating the body. When the chemo-receptors detect a high level of carbon dioxide, they send a message to the brain to increase or decrease breathing rate in order to get rid of carbon dioxide or to replenish the amount of oxygen in the body. What happens next is very clever in the fact that the body recognises that during exercise we need more oxygen. Therefore messages in the form of nerve impulses are sent to the diaphragm causing it to contract. When the diaphragm contracts it lowers itself in order for the ribs to expand and move upwards so there is inc reased space for the lungs to inflate. The muscle that allows the ribs to move up and out is called the inter costal muscle. This process of breathing rate is called inspiration. When we exhale the reverse happens to what has just been explained. The diaphragm relaxes and returns to its original position. The inter costal muscle that allows the ribs to move up and out also relaxes and returns the ribs to their stationary position. This process is known as expiration. Blood glucose Blood glucose is simply the control of sugar levels in the body, and determines when the body needs more glucose (sugar) or when it needs less. The part of the body that controls the glucose is the pancreas. The pancreas releases insulin which is made to lower blood sugar levels when it gets too high but can also create glucagon that brings the blood sugar levels up when they are too low. Blood sugar levels mainly are affected and altered by the food we eat. Before a meal our blood sugar levels will be running low but after we’re eaten our blood sugar levels will be a lot higher, and in many cases will need the help of insulin to bring them down to the normal level, between 4 and 8ml, if we have consumed too much. The process of how we get the sugar is from the food we eat, mainly by the carbohydrates we consume. Carbohydrates are taken into the body by the food, and are then digested and changed into glucose that the body can use for energy. During exercise blood sugar levels will fall below our normal, so our body receptors say ‘level of glucose in the body is too low’ and therefore will tell the pancreas to produce glycogen to bring our sugar levels back up.