Bronsted Lowry Theory of Acids and Bases

The Brà ¸nsted-Lowry acid-base theory (or Bronsted Lowry theory) identifies strong and weak acids and bases based on whether the species accepts or donates protons or H. According to the theory, an acid and base react with each other, causing the acid to form its conjugate base and the base to form its conjugate acid by exchanging a proton. The theory was proposed independently by Johannes Nicolaus  Brà ¸nsted  and Thomas Martin Lowry in 1923. In essence, Brà ¸nsted-Lowry acid-base theory is a general form of the Arrhenius theory of acids and bases. According to the Arrhenius theory, an Arrhenius acid is one that can increase the hydrogen ion (H) concentration in aqueous solution, while an Arrhenius base is a species that can increase the hydroxide ion (OH-) concentration in water. The Arrhenius theory is limited because it only identifies acid-base reactions in water. The Bronsted-Lowry theory is a more inclusive definition, capable of describing acid-base behavior under a wider range of conditions. Regardless of the solvent, a Bronsted-Lowry acid-base reaction occurs whenever a proton is transferred from one reactant to the other. Key Takeaways: Brà ¸nsted-Lowry Acid-Base Theory According to the Brà ¸nsted-Lowry theory, an acid is a chemical species capable of donating a proton or hydrogen cation.A base, in turn, is able to accept a proton or hydrogen ion in aqueous solution.Johannes Nicolaus  Brà ¸nsted  and Thomas Martin Lowry independently described acids and bases this way in 1923, so the theory usually bears both of their names. Main Points of the Bronsted Lowry Theory A Bronsted-Lowry acid is a chemical species capable of donating a proton or hydrogen cation.A Bronsted-Lowry base is a chemical species capable of accepting a proton. In other words, it is a species that has a lone electron pair available to bond to H.After a Bronsted-Lowry acid donates a proton, it forms its conjugate base. The conjugate acid of a Bronsted-Lowry base forms once it accepts a proton. The conjugate acid-base pair have the same molecular formula as the original acid-base pair, except the acid has one more H compared to the conjugate base.Strong acids and bases are defined as compounds that completely ionize in water or aqueous solution. Weak acids and bases only partially dissociate.According to this theory, water is amphoteric and can act as both a Bronsted-Lowry acid and Bronsted-Lowry base. Example Identifying  Brà ¸nsted-Lowry Acids and Bases Unlike Arrhenius acid and bases, Bronsted-Lowry acids-base pairs can form without a reaction in aqueous solution. For example, ammonia and hydrogen chloride may react to form solid ammonium chloride according to the following reaction: NH3(g) HCl(g) → NH4Cl(s) In this reaction, the Bronsted-Lowry acid is HCl because it donates a hydrogen (proton) to NH3, the Bronsted-Lowry base. Because the reaction does  not occur in water and because neither reactant formed H or OH-, this would not be an acid-base reaction according to the Arrhenius definition. For the reaction between hydrochloric acid and water, its easy to identify the conjugate acid-base pairs: HCl(aq) H2O(l) → H3O Cl-(aq) Hydrochloric acid is the Bronsted-Lowry acid, while water is the Bronsted-Lowry base. The conjugate base for hydrochloric acid is the chloride ion, while the conjugate acid for water is the hydronium ion. Strong and Weak Lowry-Bronsted Acids and Bases When asked to identify whether a chemical reaction involves strong acids or bases or weak ones, it helps to look at the arrow between the reactants and the products. A strong acid or base completely dissociates into its ions, leaving no undissociated ions after the reaction is completed. The arrow typically points from left to right. On the other hand, weak acids and bases dont completely dissociate, so the reaction arrow points both left and right. This indicates a dynamic equilibrium is established in which the weak acid or base and its dissociated form both remain present in the solution. An example if the dissociation of the weak acid acetic acid to form hydronium ions and acetate ions in water: CH3COOH(aq) H2O(l) â‡Å' H3O(aq) CH3COO-(aq) In practice, you might be asked to write a reaction rather than have it given to you. Its a good idea to remember the short list of strong acids and strong bases. Other species capable of proton transfer are weak acids and bases. Some compounds can act as either a weak acid or a weak base, depending on the situation. An example is hydrogen phosphate, HPO42-, which can act as an acid or a base in water. When different reactions are possible, the equilibrium constants and pH are used to determine which way the reaction will proceed.

What Is Glamour Free Essays

Of all the styles of photography in the industry, perhaps the most misunderstood one out there is ? glamour?. By modern definitions, the word glamour means: ? alluring beauty or charm (often with sex-appeal)?. In photographic or modelling terms, ? glamour? , concentrates on a model? s appearance and presentation rather than the clothes she may or may not be wearing. We will write a custom essay sample on What Is Glamour? or any similar topic only for you Order Now It is about creating sexually provocative images, with the model often appearing to be in a constant state of near-orgasm! It is about the attitude, the eroticism, the mood, and sometimes nothing more than a particular look in a model? s eyes. It is also the most popular market where the majority of models can earn a relatively profitable living. There are no height or age restrictions (though you have to be at least 18-years-old before a photographer will even consider working with you on a glamour shoot), nor are there any size issues. All those pesky rules that are associated with the world of fashion simply don? apply, which accounts for the sheer number of glamour models out there. In a sense, it is perhaps the most democratic form of modelling in the industry that exists ? everyone can give it a go! Those models that do succeed in this field reach the top not necessarily by their good looks or stunning figures alone (although both help), but often by the sheer force of their personality and the professional attitude they bring to their work. In recent years, the glamour industry ? once the undisput ed province of the ? Page 3 Model? has been accepted more by the mainstream media due to the rise of the ? lad? s mags? (or ? mid-shelf? magazines), such as FHM and Zoo, to name but a few. Every industry has its stars, the undisputed queen of glamour has to be Jordan (Katie Price), who probably has the most cannily planned career of any model out there. Men want to be with her; women want to be just like her! Jordan has tried just about every entertainment outlet available to any self-respecting celebrity, and like Madonna has marketed herself as a brand to be reckoned with. Unlike other glamour models however who outstay their welcome, Jordan has also wisely seen that her days in this field are numbered, and has moved into fashion with consummate ease ? recently working with top fashion photographer, David Bailey. It has to be stressed however, that Jordan? s career is very much the exception, rather than the rule. One has to think long and hard to find a similar success story ? Sam Fox springs to mind, though the years have proved that she has had none of the enduring appeal or longevity of Ms. Price? s. The irony of the glamour industry, however, is that for many models, it is anything but glamorous! For the majority, it is about the inevitable travelling (be prepared for a lot of it! ) to and from shoots in cold, inhospitable studios and locations ? as well as the inevitable dangers present for impressionable young women on the road to fame and fortune. It doesn? t help, of course, that the term for ? glamour? has been hijacked by the more extreme ends of the industry to make porn sound more palatable as a product for both photographers and models alike. This lazy and convenient categorisation of the industry itself to label everything that is neither fashion nor wholesome, as ? glamour? , leads to inevitable confusion. We can? t tell you the number of first-time models we? ve worked with, who? ve either assumed that ? glamour? meant ? porn? , or that it involved some kind of nudity. On the other hand, weve also encountered models who? ve assumed that ? glamour? simply meant nothing more than wearing lingerie (nope, thats modelling lingerie, which isnt the same thing at all). So the long and the short of it is this: glamour modelling can range from lingerie to nude work, but it does NOT insist on nudity of any kind ? implied or otherwise. What a model is prepared to reveal is based sole on the requirements of a photographer offering work, but more importantly, it is dictated exclusively by what is agreed between both parties beforehand. Finally, glamour is not about how much you see, but how much you think you are going to see? How to cite What Is Glamour?, Essay examples

Personal Writing The Day of Surprise Essay Example For Students

Personal Writing: The Day of Surprise Essay Personal Writing: The Day of Surprise Essay Thats so cool! I exclaimed. In my hand was a Valentines Day card which folded to make a spaceship. I was in a Hallmark card shop with my father, looking at cards for the upcoming holiday. If I got you that card now, then it wouldnt be a surprise later, my father logically stated. But its neat! See, it folds into a spaceship. Ill get it for you but just act surprised for your mother when you open the card. Okay dad, I answered as we walked up to the counter. My father paid for the card and we left the store. Classmates would give everyone Valentine cards. Some extremely generous kids would even attach candy to the cards. It didnt matter if you hated each other, on Valentines Day everyone put aside their differences and even presented cards to the children nobody liked. That one day of love seemed to unify the worst of foes through love and forgiveness. I could hardly wait for that day to come. As the night before Valentines Day had rolled around, anticipation had escalated to an all time peak. Nevertheless, it was all set aside as my parents once again started to fight. My brother and I were sent to the car in the garage so that we would not witness them fighting. We knew the routine. I was scared and I could still hear angry voices dueling back and forth. My brother was a senior in high school and even he seemed frightened when they fought. Although he tried to hide his fear, I knew he was afraid when my father would go on a rampage. An hour passed by and my brother and I decided to go back inside. The house was still. A pin could have dropped and we would of heard it. My father had gone to lay down in his bed. This action was suggested by the marriage counselor that my parents had been visiting. Whenever my father got angry, he was supposed to rest until he calmed down. The problem was that he would lay down after he had let out all his anger, verbally or physically. My mother came downstairs. She had gathered some stuff together. Come on, get your jackets and get in the car. After we went to our rooms to get our coats, we went outside and got into our old station wagon that my brother used to drive to school. My brother put the car in neutral and coasted out of our driveway and down the hill. At the bottom of the hill he turned the ignition and drove to a friends house to stay for the evening. My mother called my father from there. I was down in the basement with the two children of the family, talking to them. I mentioned that my parents might get divorced, but in my stomach I knew they wouldnt. How could my parents even discuss such a thing on Valentines Day? Besides, we were talking about my mother and my father. Divorcing only happens to other kids parents. I felt comforted as I drifted off to sleep. The next morning when I woke up, I was sick to my stomach. My allergies to the familys two Siamese cats must have acted up. My mother told me we were going home so to get dressed. We arrived home shortly. As we drove into the driveway I noticed all of the curtains were shut. Room with a view Essay We opened the door and stepped into the dark house. I looked around for my father but he wasnt there. I had learned that my father went to stay with a coworker. Where did Valentines Day go? Had I missed it? The whole idea of Valentines Day is to celebrate love and togetherness. Yet the decision to separate had come on this day of unity. I felt nauseous. My mother comforted me and told me my fathers move was temporary. However I now knew what was happening; this change was permanent. Its for the better, my mother told me. .

Should Children Be In Competive Sports At A Young Age Essays

Should Children be in Competive Sports at a young age? Let American Consumer Counseling Help you Get Out of Debt! Should Children be in Competive Sports at a young age? Many American parents struggle to answer the puzzling question of what the appropriate age children should start to participate in competitive sports. A subject like this is puzzling because there are many issues that must be addressed, because it is controversial. Some American parents push their children too far, too young. The average American child usually will start to participate actively in competitive sports between the ages of six and twelve and can be unhealthy to a child's development (CWG 131). The question at what age a child should start, has a different answer for each individual child. Parents often fail to realize that their child may not be physically ready for competitive sports, even though the child is ready. I believe that a child should participate in sports only if he is wanting too participate and is not pushed by their parents. Every parent has a different way of looking at, if their child is ready to start. If a six year little boy wanted to start playing football, the child may not be fully capable of handling such strength and tension that might cause a life long injury (Koppett 294). Some parents may think he is ready, but is probably not. Determining whether or not a child is ready for competitive sports can sometimes be difficult to answer, because to determine if they are ready a child must be mentally ready also. Sports not only take physical strength, but a child must have psychological capacity to get them through such strenuous activity. A child may sometimes become scared when participating in sports. For example, A mother of an eight-year-old Peewee Football player explained, "The kids get so scared. They get hit once and they don't want anything to do with football anymore. They'll sit on the bench and pretend their leg hurts..."(qtd. In Tosched A32). This quote is a true statement because if a six-year-old child is playing peewee football with an eight-year-old, the eight-year old is a lot bigger that the six year old is and he could cause physical hurt to the six-year-olds tiny body. The psychological part of the story would be that the child would be so scared that he might get hurt which causes physical hurt as well as mental hurt and may scar the child for the rest of their life, when that child could of been the next pro-football player of the next century. A child should not be competitive at an early age, they should be having fun and playing the sport in wanting to and not being pushed to do so. When I was younger, I participated on the swim team so I was introduced to Compton at the age of six. My parents never pushed me to do well, they always made sure that I was having fun and that it did not matter if I win or lose. I think every parent should understand, if their child is going to start competing at a young age, that the child is having fun and not getting criticized for their mistakes when they lose.

Accounting case study Essays

Accounting case study Essays Accounting case study Essay Accounting case study Essay Dear Mr Han I am writing this letter to explain how the profit and loss account and balance sheet that you have received works. I would like to start off by explaining what the purpose of a profit and loss account is. This makes an accurate calculation of the profit or loss made by the business over a certain period of time. Depreciation in the profit and loss account is the loss in value of the assets in the business over a period of time. For example if there is a car or a van in the business the value of the car will depreciate over the years and will not be worth as much when it comes to selling it. The trading account is the basic process of a business. This shows how much profit the organisation makes by this basic business process, not including other costs that the business may incur. Some things that you would find in a trading account are: * Sales receipts for sales for the year * Sales returns amount paid back to customers when items are returned * Purchases for a manufacturing organisation this is the value of raw materials purchased; for a service business it would be the cost of items bought to sell to customers or used to provide a service to customers. The costs of goods sold are calculated by opening stock + purchases purchase returns closing stock. This is shown on my example profit and loss account. Overheads are things like rent and rates and they do not change throughout the year no matter how much they sell, there is also an example on my profit and loss account. Gross profit is calculated by the net sales cost of goods sold. Net profit is calculated by gross profit all other costs that the business incurs. I would like to explain the different kinds of income and expenditure that businesses incur. Expenditure is any money spent on any costs of the business, such as: * Rent * Wages * Petrol Drawings and the cost of fixed assets are not classed as an expense and do not appear in the profit and loss account. Income is the money that the business is earning for example through sales. Capital income is money or value contributed to the business by the owner to get it started or buy equipment. They can receive money through rent received, which is when a business has a property that they rent out to another business, which then gives them income every month, commission received is when the business may sell a product o a service on behalf of another organisation and then they may receive commission for selling the other businesses products or services. This is an explanation on how you know that the accounts balance. Capital + net profit the amount the owner has paid off = less drawings. So net assets and less drawings are the two figures on the accounts that have to be the same for the account to balance. I hope that this letter has helped you figure out how the profit and loss accounts and balance sheet works. Yours sincerely Hannah Clark

Make green tech, not green legislation Research Paper

Make green tech, not green legislation - Research Paper Example Google has had a track record of getting into trouble over privacy issues. This article pertains to the most recent trouble that Google faces on this issue. Google faces investigation from regulators in the U.S.A and Europe over its bypassing of the user privacy settings on Apple’s Safari Web browser. Bypassing of the privacy settings by Google was through the use of enabling special codes that allowed Google to maintain a track of computer and mobile users. Google says it will cooperate with the investigation and has stopped the use of these special codes and the tracking of computer and mobile users. However, Google had earlier taken the stand that the advertisement cookies through which the security was bypassed, was to provide features that the users themselves had enabled. In addition, it was also earlier stated that personal information of the users was not collected by the generated advertisement cookies. (2).

Strengths, Weaknesses and Plan of Action of an Analysis Essay

Strengths, Weaknesses and Plan of Action of an Analysis - Essay Example I have also been able to use a variety of sentence structures like simple, compound and complex sentence structures which help articulate my thoughts in a proper manner. Very short paragraphs keep the reader interested. I am also able to, as it shows by my draft, discuss both the sides of the issue so that the reader may be able to get a better idea about the positive and negative aspects of the issue at hand. It seems that I am very efficient in the presentation of my draft as the tone remains the same and all textual evidence is properly cited. It seems that I have been unable to specify a specific audience for my text. This may have led to some confusion for the reader as to for whom the text is really intended for. The text is not confusing in itself, but still, there should have been audience specification. I have not used any metaphors. The text seems to be less literary and more philosophical, which is something that many readers who are looking for some scholarly text might get disappointed about. Also, I have not used any external source which may have been necessary to back up my opinion. I have generalized the issue according to my own opinion, and there is no external source to support my argument. Other than these points, I have not come to know any noticeable weakness in the structure, layout and presentation in my text by way of my instructor’s and peer’s feedback. The first thing I need to revise is that I should incorporate some external sources in my text to back up my argument. I think it is very important as one is able to give more evidence to support one’s point of view. This involves research, and I must be able to do this by looking up for literary sources in the library and over the internet. I must, however, first consult my instructor to determine whether an external source is actually required in the first place. The second thing that I need to think upon is specifying my audience.