Chemistry Vocabulary - Definitions of Chemistry Terms

Chemistry Vocabulary - Definitions of Chemistry Terms This is a list of important chemistry vocabulary terms and their definitions. A more comprehensive list of chemistry terms can be found in my alphabetical chemistry glossary. You can use this vocabulary list to look up terms or you can make flashcards from the definitions to help learn them. absolute zero - Absolute zero is 0K. It is the lowest possible temperature. Theoretically, at absolute zero, atoms stop moving. accuracy - Accuracy is a measure of how close a measured value is to its true value. For example, if an object is exactly a meter long and you measure it as 1.1 meters long, that is more accurate than if you measured it at 1.5 meters long. acid - There are several ways to define an acid, but they include any chemical that gives off protons or H in water. Acids have a pH less than 7. They turn the pH indicator phenolphthalein colorless and turn litmus paper red. acid anhydride - An acid anhydride is an oxide that forms an acid when it is reacted with water. For example, when SO3- is added to water, it becomes sulfuric acid, H2SO4. actual yield - The actual yield is the amount of product you actually obtain from a chemical reaction, as in the amount you can measure or weigh as opposed to a calculated value. addition reaction - An addition reaction is a chemical reaction in which atoms add to a carbon-carbon multiple bond. alcohol - An alcohol is any organic molecule that has an -OH group. aldehyde - An aldehyde is any organic molecule that has a -COH group. alkali metal s of alkali metals include lithium, sodium, and potassium. alkaline earth metal s of alkaline earth metals are magnesium and calcium. alkane - An alkane is an organic molecule that only contains single carbon-carbon bonds. alkene - An alkene is an organic molecule that contains at least one CC or carbon-carbon double bond. alkyne - An alkyne is an organic molecule that contains at least one carbon-carbon triple bond. allotrope - Allotropes are different forms of a phase of an element. For example, diamond and graphite are allotropes of carbon. alpha particle - An alpha particle is another name for a helium nucleus, which contains two protons and two neutrons. Its called an alpha particle in reference to radioactive (alpha) decay. amine - An amine is an organic molecule in which one or more of the hydrogen atoms in ammonia have been replaced by an organic group. An example of an amine is methylamine. base - A base is a compound that produces OH- ions or electrons in water or that accepts protons. An example of a common base is sodium hydroxide, NaOH. beta particle - A beta particle is an electron, although the term is used when the electron is emitted in radioactive decay. binary compound - A binary compound is one made up of two elements. binding energy - Binding energy is the energy that holds protons and neutrons together in the atomic nucleus. bond energy - Bond energy is the amount of energy required to break one mole of chemical bonds. bond length - Bond length is the average distance between the nuclei of two atoms that share a bond. buffer - A liquid that resists change in pH when an acid or base is added. A buffer consists of a weak acid and its conjugate base. An example of a buffer is acetic acid and sodium acetate. calorimetry - Calorimetry is the study of heat flow. Calorimetry may be used to find the heat of reaction of two compounds or the heat of combustion of a compound, for example. carboxylic acid - A carboxylic acid is an organic molecule containing a -COOH group. An example of a carboxylic acid is acetic acid. catalyst - A catalyst is a substance that lowers the activation energy of a reaction or speeds it up without being consumed by the reaction. Enzymes are proteins that act as catalysts for biochemical reactions. cathode - A cathode is the electrode which gains electrons or is reduced. In other words, it is where reduction occurs in an electrochemical cell. chemical equation - A chemical equation is a description of a chemical reaction, including what reacts, what is produced, and which direction(s) the reaction proceeds. chemical property - A chemical property is a property that can only be observed when a chemical change occurs. Flammability is an example of a chemical property, since you cant measure how flammable a substance is without igniting it (making/breaking chemical bonds). covalent bond - A covalent bond is a chemical bond formed when two atoms share two electrons. critical mass - Critical mass is the minimum quantity of radioactive material needed to cause a nuclear chain reaction. critical point - The critical point is the endpoint of the liquid-vapor line in a phase diagram, past which a supercritical liquid forms. At the critical point, the liquid and vapor phases become indistinguishable from one another. crystal - A crystal is an ordered, repeating three-dimensional pattern of ions, atoms, or molecules. Most crystals are ionic solids, although other forms of crystals exist. delocalization - Delocalization is when electrons become free to move all over a molecule, such as when double bonds occur on adjacent atoms in a molecule. denature - There are two common meanings for this in chemistry. First, it can refer to any process used to make ethanol unfit for consumption (denatured alcohol). Second, denaturing can mean breaking down the three-dimensional structure of a molecule, such as a protein is denatured when exposed to heat. diffusion - Diffusion is the movement of particles from an area of higher concentration to one of lower concentration. dilution - Dilution is when a  solvent is added to a solution, making it less concentrated. dissociation - Dissociation is when a chemical reaction breaks a compound into two or more parts. For example, NaCl dissociates into Na and Cl- in water. double displacement reaction - A double displacement or double replacement reaction is when cations of two compounds switch places. effusion - Effusion is when a gas moves through an opening into a low-pressure container (e.g., is drawn by a vacuum). Effusion occurs more quickly than diffusion because additional molecules arent in the way. electrolysis - Electrolysis is using electricity to break the bonds in a compound to break it apart. electrolyte - An electrolyte is an ionic compound that dissolves in water to produce ions, which can conduct electricity. Strong electrolytes completely dissociate in water, while weak electrolytes only partially dissociate or break apart in water. enantiomers - Enantiomers are molecules that are non superimposable mirror images of each other. endothermic - Endothermic describes a process that absorbs heat. Endothermic reactions feel cold. endpoint - The endpoint is when a titration is stopped, typically because an indicator has changed color. The endpoint need not be the same as the equivalence point of a titration. energy level - An energy level is a possible value of energy that an electron can have in an atom. enthalpy - Enthalpy is a measure of the amount of energy in a system. entropy - Entropy is a measure of the disorder or randomness in a system. enzyme - An enzyme is a protein that acts as a catalyst in a biochemical reaction. equilibrium - Equilibrium occurs in reversible reactions when the forward rate of the reaction is the same as the reverse rate of the reaction. equivalence point - The equivalence point is when the solution in a titration is completely neutralized. It is not the same as the endpoint of a titration because the indicator may not change colors precisely when the solution is neutral. ester - An ester is an organic molecule with a R-CO-OR function group. excess reagent - Excess reagent is what you get when there is leftover reagent in a chemical reaction. excited state - An excited state is a higher energy state for an electron of an atom, ion, or molecule, compared with the energy of its ground state. exothermic - Exothermic describes a process that gives off heat. family - A family is a group of elements sharing similar properties. It is not necessarily the same thing as an element group. For example, the chalcogens or oxygen family consists of some different elements from the nonmetal group. Kelvin - Kelvin is a unit of temperature. A Kelvin is equal in size to a degree Celsius, although Kelvin starts from absolute zero. Add 273.15 to a Celsius temperature to get the Kelvin value. Kelvin is not reported with a  ° symbol. For example, you would simply write 300K not 300 °K. ketone - A ketone is a molecule that contains a R-CO-R functional group. An example of a common ketone is acetone (dimethyl ketone). kinetic energy - Kinetic energy is energy of motion. The more an object moves, the more kinetic energy it has. lanthanide contraction - The lanthanide contraction refers to the trend in which lanthanide atoms become smaller as you move left to right across the periodic table, even though they increase in atomic number. lattice energy - Lattice energy is the amount of energy released when one mole of a crystal forms from its gaseous ions. law of conservation of energy - The law of conservation of energy states the energy of the universe may change form, but its amount remains unchanged. ligand s of common ligands include water, carbon monoxide, and ammonia. mass - Mass is the amount of matter in a substance. It is commonly reported in units of grams. mole - Avogadros number (6.02 x 1023) of anything. node - A node is a location in an orbital with no probability of containing an electron. nucleon - A nucleon is a particle in the nucleus of an atom (proton or neutron). oxidation number The oxidation number is the apparent charge on an atom. For example, the oxidation number of an oxygen atom is -2. period - A period is a row (left to right) of the periodic table. precision - Precision is how repeatable a measurement is. More precise measurements are reported with more significant figures. pressure - Pressure is force per area. product - A product is something made as a result of a chemical reaction. quantum theory - Quantum theory is the description of energy levels and the predictions about the behavior of atoms at specific energy levels. radioactivity - Radioactivity occurs when the atomic nucleus is unstable and breaks apart, releasing energy or radiation. Raoults Law - Raoults Law states that the vapor pressure of a solution is directly proportional to the mole fraction of solvent. rate determining step - The rate determining step is the slowest step in any chemical reaction. rate law - A rate law is a mathematical expression relating the speed of a chemical reaction as a function of concentration. redox reaction - A redox reaction is a chemical reaction that involves oxidation and reduction. resonance structure - Resonance structures are the set of Lewis structures that can be drawn for a molecule when it has delocalized electrons. reversible reaction - A reversible reaction is a chemical reaction which can go both ways: reactants make products and products make reactants. RMS velocity - The RMS or root mean square velocity is the square root of the average of the squares of individual velocities of gas particles, which is a way of describing the average speed of gas particles. salt - An ionic compound formed from reacting an acid and a base. solute - The solute is the substance that gets dissolved in a solvent. Usually, it refers to a solid that is dissolved in a liquid. If you are mixing two liquids, the solute is the one that is present in a smaller amount. solvent - This is the liquid that dissolves a solute in solution. Technically, you can dissolve gases into liquids or into other gases, too. When making a solution where both substances are in the same phase (e.g., liquid-liquid), the solvent is the largest component of the solution. STP - STP means standard temperature and pressure, which is 273K and 1 atmosphere. strong acid - A strong acid is an acid that completely dissociates in water. An example of a strong acid is hydrochloric acid, HCl, which dissociates into H and Cl- in water. strong nuclear force - The strong nuclear force is the force that holds the protons and neutrons in an atomic nucleus together. sublimation - Sublimation is when a solid changes directly into a gas. At atmospheric pressure, dry ice or solid carbon dioxide goes directly into carbon dioxide vapor, never becoming liquid carbon dioxide. synthesis - Synthesis is making a larger molecule from two or more atoms or smaller molecules. system - A system includes everything you are evaluating in a situation. temperature - Temperature is a measure of the average kinetic energy of particles. theoretical yield - Theoretical yield is the amount of product which would result if a chemical reaction proceeded perfectly, to completion, with no loss. thermodynamics - Thermodynamics is the study of energy. titration - Titration is a procedure in which the concentration of an acid or base is determined by measuring how much base or acid is required to neutralize it. triple point - The triple point is the temperature and pressure at which the solid, liquid, and vapor phases of a substance exist in equilibrium. unit cell - A unit cell is the simplest repeating structure of a crystal. unsaturated - There are two common meanings for unsaturated in chemistry. The first refers to a chemical solution that does not contain all of the solute that can be dissolved in it. Unsaturated also refers to an organic compound which contains one or more double or triple carbon-carbon bonds. unshared electron pair - An unshared electron pair or lone pair refers to two electrons that arent participating in chemical bonding. valence electron - The valence electrons are the atoms outermost electrons. volatile - Volatile refers to a substance that has a high vapor pressure. VSEPR - VSEPR stands for Valence Shell Electron Pair Repulsion. This is a theory used that predicts molecular shapes based on the assumption that electrons stay as far as possible from each other. Quiz Yourself Ionic Compound Names QuizElement Symbol Quiz

Entrepreneurship Essay Example | Topics and Well Written Essays - 3750 words - 1

Entrepreneurship - Essay Example The behemoths of Information Technology industry like. Microsoft, Yahoo, Google, the IT giants, are all results of ‘entrepreneurial vision’ of their founders. Who is an entrepreneur? What are the chief causes for the success of entrepreneurs? What are the attributes required for being an entrepreneur? What makes entrepreneurship different from regular business? How does an entrepreneur with very little resources create wealth and value? We will study ‘the entrepreneur’ along with the special strategies; he makes use of, by researching contemporary literature on entrepreneurship. Entrepreneurship is the business idea, the set of practices adopted by an entrepreneur for value enhancement and wealth creation. Entrepreneurship is a break from the past; conception and creation of a unique venture through novel means, and a synergy of strategy, technology, material, and human resources. Entrepreneurship involves a high risk factor as it can’t be forecast with certainty whether a particular entrepreneurship idea would succeed or fail. The results often vary between and extreme success and abject failure. Nevertheless, the entrepreneur, by his inherent nature, keeps on experimenting taking risks, losses and failures in his stride, till he hits upon an idea that clicks. Entrepreneurship has been differently viewed, and hence interpreted differently, over a period of time. In the earlier times entrepreneurship was related to buying and selling of commodities, whereupon a trader took upon himself the buying of a product at a certain price, and selling it for an uncertain price (Di-Masi n.d.). One of the earliest definitions of entrepreneur offered by JS Mill (1848) (quoted by Brockhaus, Sr 2000) as â€Å"one who undertakes to start and conduct an enterprise or business, assuming full control and risks† may have held to be

Article summary Example | Topics and Well Written Essays - 500 words - 1

Summary - Article Example ing solar power (CSP) and photovoltaics (PVs) – and notes that while these types seek at the maximization of solar energy, they have different approaches (Hamer 1). The considered questions in the article are related to the primary types of solar energy, the suitability of solar energy in heating water and the benefits that zero net energy constructions give to consumers. In this line, Hamer states that the world’s global energy needs will be largely dependent on the use of solar devices to harness light and heat from the sun for the generation of electricity via photovoltaic cells, owing to the declining prices of solar collectors. This reason is also largely supported by the sunny forecasts put on solar energy and a resemblance of the electricity system to the internet, having no particular center of activity, except for the photovoltaics integrated into roofs and windows. Consequently, Hamer states that there is an increase in the production, but, a subsequent decline in purchasing costs of PVs; hence, likely to have a significant impact on the installation of PVs and access to electricity. This would then classify solar energy for the many uses that electricity can be put to such as heating of water. PVs are also environmentally friendly as they produce no greenhouse gases or atmospheric emissions as a technology. Therefore, it presents itself as the most likely choice of renewable energy technology for embracing by the public (Hamer 1). Finally, a proposal for zero net energy buildings is given in which the Department of Energy is considering producing houses that consume no energy on net rate, but, incorporate numerous technologies for future homes, including the solar thermal and photovoltaics. In this article, the core theme as presented by Haugen is that of the effective production of electricity through solar energy. First, the energy is described as clean and reliable by the National Renewable Energy Laboratory (NREL), as a counter for myths over

Parent Teacher Behavior

Parent Teacher Behavior The correlation of a good parent and teacher relationship Parents and teachers constitute two of the most important information sources of young childrens social skills. However, Parents and teachers often are very influential adults in childrens lives, and thus they can provide important perspectives and information concerning childrens behavior. Parents are unique compared to other adults in that they often have observed their childrens behavior across time and across diverse situations. It declared that parents often are aware of subtleties in their childrens behavior and are able to observe them in different contexts, and, therefore, they should be included in the assessment of their children. Inclusion of mothers, fathers, and teachers as assessors allows for comparisons regarding their agreement about childrens behavior across situations with consideration of physical location as well as with sensitivity to differential behavioral values. (Mouly, 2000) In research it has been found that teachers benefit from involvement with parents. Teachers who had high involvement with parents indicated that they were more proficient in instructional and professional activities, devoted more time to instruction, and maintained better parent relationships than did teachers who had little contact with parents. As a result of these reciprocal benefits of parent-teacher relationships, others have encouraged the use of home school collaboration programs to help modify childrens academic and social behavior in school. (Slavin, 2005) Parents play an important role in an exceptional childs life and must inform teachers of their special conditions since no two children are alike. (Mouly, 2000) Teachers can be very helpful in supporting a childs treatment once parents inform them about the disorder. Parents can provide information to the teachers and school personnel about their childs medication or other special needs. From here, teachers can provide parents with occasional progress reports. Even if a child is not active at school, teachers should be informed that treatment can improve the childs ability to learn. However, misunderstandings between student, parent and teacher are common, but can be lessened with early communication between parent and teacher. The first contact between parent and teacher should be made before problems arise with the student. Parents can get involved in school activities in many ways, they can assist teachers with class once a week, volunteer to talk to the class on a particular topic, help with field trips or donate supplies for special events or projects. Some techniques that have effectively been used when working with parents of exceptional students are as follows, effective use of home liaisons, teachers who go on visits with home liaisons to enhance communication between school and parents, treating the parents with respect, encouraging their continued assistance with their childs education, and complimenting them on participation in their childs education. Some other suggestions for improvements that could be made are, training parents specifically in their roles in Individual Education Plans and School Evaluation Teams; obtaining through interviews and observations, viewpoints and feelings of parents; communication through media forms (announcements about appropriate meetings); guest speakers for parent meetings who would give in depth training concerning parental rights, early intervention, and transition plans; all teachers should be required to make personal contact with parents even if there is no apparent intervention neede d, this will keep the door of communication open; activities taught at school that would have a parent participation component included at home. It is very important that teachers help the parents of exceptional children to learn their rights. (OCD, 2005) Some of these parents dont know them at all and some only know bits and pieces that seem misconstrued. Teachers are required to have the parents sign their parental rights at all the meetings with the Diagnostician that would be concerning the childs education. It would be helpful for the parents to know and understand what they are signing for them to feel more comfortable. Most parents are kind of scared to sign things that they are unsure about, and then they are tense and unable to really make the best decisions about their child. (Slavin, 2005) In conclusion, I feel that working with parents of exceptional students will cause a mix of emotions. You are required to be on your toes at all times and they expect you to know everything, but as long as you treat them with respect and follow the simple guidelines from this paper, you shouldnt have a problem. You just have to keep in mind that you are teaching their pride and joy exceptionalities and all. References Mouly, G. (2000). Psychology for effective teaching. New York: Holt, Rinehart and Winston. OCD Resource Center, (n.d.). Child adolescent ocd. Retrieved Mar. 20, 2005. Slavin, B. (2000). Learners with exceptionalities. Ford, D. (1996, Aug 05). Good parent-teacher relationship benefits children. College ofAgriculture and Home Economics, Retrieved Mar 20, 2005 Jones, D. (1997, Mar ), Working with navajo parents of exceptional children. Communication is the key. Retrieved Mar. 20, 2005, from Children, Youth and Family Establishing a parent-teacher relationship. (1998).

Individual Cultural Variables Role in Inter-Cultural Communication Essay

Individual cultural variables are very important to comprehend intercultural communication. Justify the statement with the help of three individual cultural variables. Solution: The following three individual cultural variables show that these variables have great importance in intercultural communication: Time: Time has great importance in our daily life in communication. But different cultures of the world value it differently. One should be aware of the different perception of time in different cultures in order to communicate effectively. Its importance can be seen in the following points: * People of Asian countries usually like to take nap in the afternoon while in some western countries, they just wake up at that time. * In developed countries like France, America, Canada etc the shops, markets and restaurants remain open for whole night but in developing countries like India, Pakistan etc they just remain opened till midnight mostly. * The developed countries value their time a lot. They consider their time as money. They are mostly straight forward and just try to reach at the point. * Similarly different people also have different view point about the weather. They like different seasons. One should keep in mind the perception of the people about the weather before communicating. Like people in Pakistan usually get hyper because of the hot weather. So, one should talk tactfully in order to keep the communication effective. * People of the Muslim countries usually take a break for prayers. So, while conducting a meeting with a Muslim, a person should keep in mind the prayers timing. * People of the Pakistan don’t follow time strictly on different festivals and occasions like marriages, parties etc. But in America, they usually try to conduct the event right on time. Dress: The dresses of the individuals also tell a great deal about that person and his culture while communicating. Its significance is explained in the following points: * Whenever a person gives a speech in some seminar, it is must for him to wear clean clothes and according to the custom of that country. A good dress always conveys a clear non-verbal message to the recipient. * If you wear the dress according to the culture of the visiting country, this will attract the persons of that country when you communicate with them and create the good reputation of yours in the mind of the people. * We also have to wear the clothes according to the fashion of the society. An up to date person always gets the attention of the people. * In Pakistan, we have four provinces, each province has its own traditional dress style. We should try to wear the clothes according to the culture of that province to win the hearts of that community. * The color of the dress should be chosen with great care and according to the occasion. Like in Pakistan, people usually wear white dress on the funeral ceremony. They don’t like if someone wear colorful dress on the fun eral ceremony. Food: People of the different societies have different tastes for food. The following points show its importance in the communication: * One should be very much careful about the food before going in any country. Like Muslims have to take great care in choosing the HALAL food before eating in any foreign country. * If you are conducting a party for the foreigners, then you should keep in mind their tastes and eating habits. The selection of the dishes should also be according to the guest’s choice. * People in Asian countries eat spicy food while western countries prefer to eat junk food. Similarly pork is forbidden in Middle Eastern countries. It’s very much hard to find beef in India. A person should be well aware of the eating habits of a country before visiting it. * Chinese people like noodles and rice a lot. They mostly use sticks to eat their food. One should also be aware of the eating and table manners of the country before going for any visit. * Some people like to take small bite and eat slow while some people eat fast. Some people eat with right hands while some eat with left hands. So all these things should be kept in mind before having a dinner with a person. This helps a great deal in developing an understanding level.

Chinas Boxer Rebellion of 1900

The Boxer Rebellion,  a bloody uprising in China at the turn of the 20th century against foreigners, is a relatively obscure historical event with far-reaching consequences that nevertheless is often remembered because of its unusual name. The Boxers Who exactly were the Boxers? They were members of a secret society made up mostly of peasants in northern China known as I-ho-chuan (Righteous and Harmonious Fists) and were called the Boxers by the  Western press; members of the secret society practiced boxing and calisthenic rituals that they thought would make them impervious to bullets and attacks, and this led to their unusual but memorable name. Background   At the end of the 19th century, Western countries and Japan had major control over economic policies in China  and had significant territorial and commercial control in northern China. The peasants in this area were suffering economically, and they blamed this on the foreigners who were present in their country. It was this anger that gave rise to the violence that would go down in history as the Boxer Rebellion. The Boxer Rebellion Beginning in the late 1890s, the Boxers began attacking Christian missionaries, Chinese  Christians  and foreigners in northern China. These attacks eventually spread to the capital, Beijing, in June 1900, when  the Boxers destroyed railroad  stations and churches and laid siege to the area where foreign diplomats lived. It is estimated that that death toll included several hundred foreigners and several thousand Chinese Christians. The Qing Dynastys Empress Dowager Tzu’u Hzi  backed the Boxers, and the day after the Boxers began the siege on foreign diplomats, she declared war on all foreign countries that had diplomatic ties with China.   Meanwhile, a multinational foreign force was gearing up in northern China. In August 1900, after nearly two months of the siege, thousands of allied American, British, Russian, Japanese, Italian, German, French and Austro-Hungarian troops moved out of northern China to take Beijing and put down the rebellion, which they accomplished. The Boxer Rebellion formally ended in September 1901 with the signing of the Boxer Protocol, which mandated the punishment of those involved in the rebellion and required China to pay reparations of $330 million to the countries affected. Fall of the Qing Dynasty The Boxer Rebellion weakened the Qing dynasty, which was the last imperial dynasty of China and ruled the country from 1644 to 1912. It was this dynasty that established the modern territory of China.   The diminished state of the Qing dynasty after the Boxer Rebellion opened the door to the Republican Revolution of 1911 that overthrew the emperor and made China a republic. The Republic of China,  including mainland China and Taiwan, existed from 1912 to 1949. It fell to the Chinese Communists in 1949, with mainland China officially becoming the Peoples Republic of China and Taiwan the headquarters of the Republic of China. But no peace treaty has ever been signed, and significant tensions remain.

Corporate Governance Of The Uk And The Us - 2418 Words

Introduction (The Telegraph, 2015) This quotation was made by Sir Adrian Cadbury, who is recognized for his report on corporate governance in the year 1992 (Adeney, 2015). In the past decades several events, such as company failures and frauds had shown the importance of corporate governance in countries like the UK and the US. Different scandals including Maxwell, Polly Peck and Enron led to different approaches in corporate governance within these countries (Monks; Minow, 2004 p. 1). In contrary for country X, this topic wasn’t that significant. This was a result of the lower economy compared with UK and US. As from now, with the growing economy and the wish to access to capital markets, it’s important to establish some approaches of Corporate Governance. This information document gives an overview and analysis of the approaches from Corporate Governance currently used in the UK and the US as well as a discussion of events and situations that influenced the development of the Corporate Governance code. This document provides a critical appraisal of the values of corporate governance in practice. Definition and history of Corporate Governance Corporate Governance can be defined as a Regarding to the OECD, corporate governance tries to balance the interests of companies’ stakeholders, as well as supporting the access to capital for long term investment (OECD, 2015). There is no significant point of time Corporate Governance started. The need of CorporateShow MoreRelatedCorporate Governance Around the World: a Comparison of the Us, Uk and Other European Models1193 Words   |  5 PagesWhat is Corporate Governance and why is it necessary? 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