Empirical Formula Definition and Examples

The empirical formula of a compound is defined as the  formula that shows the ratio of elements present in the compound, but not the actual numbers of atoms found in the molecule. The ratios are denoted by subscripts next to the element symbols. Also Known As: The empirical formula is also known as the  simplest formula  because the subscripts are the smallest whole numbers that indicate the ratio of elements. Empirical Formula Examples Glucose has a molecular formula of C6H12O6. It contains 2 moles of hydrogen for every mole of carbon and oxygen. The empirical formula for glucose is CH2O. The molecular formula of ribose is C5H10O5, which can be reduced to the empirical formula CH2O. How to Determine Empirical Formula Begin with the number of grams of each element, which you usually find in an experiment or have given in a problem.To make the calculation easier, assume the total mass of a sample is 100 grams, so you can work with simple percentages. In other words, set the mass of each element equal to the percent. The total should be 100 percent.Use the molar mass you get by adding up the atomic weight of the elements from the periodic table to convert the mass of each element into moles.Divide each mole value by the small number of moles you obtained from your calculation.Round each number you get to the nearest whole number. The whole numbers are the mole ratio of elements in the compound, which are the subscript numbers that follow the element symbol in the chemical formula. Sometimes determining the whole number ratio is tricky and youll need to use trial and error to get the correct value. For values close to x.5, youll multiply each value by the same factor to obtain the smallest whole number multiple. For example, if you get 1.5 for a solution, multiply each number in the problem by 2 to make the 1.5 into 3. If you get a value of 1.25, multiply each value by 4 to turn the 1.25 into 5. Using Empirical Formula to Find Molecular Formula You can use the empirical formula to find the molecular formula if you know the molar mass of the compound. To do this, calculate the empirical formula mass and then divide the compound molar mass by the empirical formula mass. This gives you the ratio between the molecular and empirical formulas. Multiply all of the subscripts in the empirical formula by this ratio to get the subscripts for the molecular formula. Empirical Formula Example Calculation A compound is analyzed and calculated to consist of 13.5 g Ca, 10.8 g O, and 0.675 g H. Find the empirical formula of the compound. Start by converting the mass of each element into moles by looking up the atomic numbers from the periodic table. The atomic masses of the elements are 40.1 g/mol for Ca, 16.0 g/mol for O, and 1.01 g/mol for H. 13.5 g Ca x (1 mol Ca / 40.1 g Ca) 0.337 mol Ca 10.8 g O x (1 mol O / 16.0 g O) 0.675 mol O 0.675 g H x (1 mol H / 1.01 g H) 0.668 mol H Next, divide each mole amount by the smallest number or moles (which is 0.337 for calcium) and round to the nearest whole number: 0.337 mol Ca / 0.337   1.00 mol Ca 0.675 mol O / 0.337 2.00 mol O 0.668 mol H / 0.337 1.98 mol H which rounds up to 2.00 Now you have the subscripts for the atoms in the empirical formula: CaO2H2 Finally, apply the rules of writing formulas to present the formula correctly. The cation of the compound is written first, followed by the anion. The empirical formula is properly written as Ca(OH)2

Causes And Effects Of Revolutions - 1237 Words

The Causes and Effects of Revolutions Revolutions have occurred throughout history and continue to arise even in the present day. Many revolution happens because of the miscommunication between the government and its citizens. In the end, the outcome of revolutions are usually good but, sometimes it might not be what people want. In the following paragraphs, examples of the general causes and effects that creates a revolution will be discussed in order to illustrate how revolutions are mainly caused by the dispute between the regime and its citizen. When a revolution begins, there is always a cause behind it and most of time it s the government s unfair treatment to its citizens. Inequality can come in many different types, such as†¦show more content†¦For example, in the French revolution, the bread prices rise due to the poor harvest of wheat before and during the French revolution and the deregulation of the grain market. Even though bread was expensive, people would still have to purchase and consume it in order to survive because it was the staple food in France. As a result, with the increased price of bread and the unchanged rate of taxation and wages, this caused a famine in France where many people from the lower class died from it. Therefore, it has prompted a mass of people to revolt. Hence, this leads to social inequality. Social inequality is when people in the upper class owns a greater amount of wealth than those who are in the middle and lower class. For instance, in the Chinese revolution, the regime ke pt increasing the taxes on its citizens, causing a disparity between the middle and upper classes. As a result, no matter how much the government increase in taxes, the upper class would always have the money to pay for it since they own a significant amount of wealth, while those who are in the middle class and lower class doesn t have the ability to pay for the large amount of taxes. Therefore, this causes the middle and lower classes to revolt. Despite that the regimes are treating its citizens unfairly in the past, this type of issue still occurs in the present day which causes the many different types of revolutions worldwide. In every

Poem Analysis “Out, Out” Free Essays

Poem Analysis: â€Å"Out, Out-† In the poem, â€Å"Out, Out-â€Å", author Robert Frost starts off his poem by giving an inanimate object, the buzzsaw, a sense of life. Using the literary device, Personification, the buzz saw is being written with characteristics a curious and rather playful child. The buzzsaw acts like once hears the young man’s mother call for supper time, that it wants to eat, so eats the young man’s hand. We will write a custom essay sample on Poem Analysis â€Å"Out, Out† or any similar topic only for you Order Now The buzzsaw takes (Cuts Off) the hand in a rather subtle demeanor, but in truth, it would be a very graphic to behold. Throughout the poem, everything is written in a peaceful and quite tone, even during the violent and gruesome ones to. To add to the fact of the buzzsaw is being personified in the story, the buzzsaw seems to only attack when the mother calls all for supper. The buzzsaw acts like it knows what the meaning of supper time is. Another literary device used in this poem is the process of along with the use of otomotapia(s). Using repetition first to deliver emphasis to the reader of the sounds that buzzsaw would be making, and then the actual sound being written/sounded out in an otomotapia base. The otomotapia in the story would be the grinding sounds made the buzzsaw ripping the through the poor young man’s arm. This quote from the story pretty much sums all that I describe above; â€Å"The saw snarled and rattled, snarled and rattled†¦Ã¢â‚¬  and it continues about three more times over and over. The use of the sound effects gives the once playful buzzsaw a more animalistic approach, making it seem like it is hungry after hearing the key word â€Å"supper†. To conclude, the literary devices used in Robert Frost’s poem are mostly to emphasis and give life to once lifeless piece of machinery. The story, rather bloody and saddening, is a well written example of poetry and depth behind each and every letter/word. The analysis is still to be assessed, but this all gives basic understanding as to what meant behind his more obvious literary devices. How to cite Poem Analysis â€Å"Out, Out†, Essay examples

Optical Network Design and Planning

Question: Discuss about the Optical Network Design and Planning. Answer: Network Diagram Figure: 1 Network Diagram The above network diagram portrays that a total of seven personal computer are connected to the network via wired line whereas, one laptop and one tablet computer are accessing the network through the wireless connection. In the above-designed network, diagram has total two routers and two switches. Router 1 is connected to the internet and the second router is connected to router one. Two routers are connected with two switches respectively. Switch one is connected with the router one and switch two is connected to the second router. Three PCs are connected to the switch one, and other three PCs are connected to the second switches which are subnet B and subnet A. The main network administration system is connected with the switch one. A wireless access point also connected with the switch one. A tablet computer and a laptop computer access, the network via access point which is subnet C. The subnet C network, is connected to the internet via switch and router. In the Subnet 3 netwo rk, it has wireless access to the internet. Subnet A System IP Address Subnet Mask Gateway Address PC1 172.22.0.2 255.255.254.0 172.22.0.1 PC2 172.22.0.3 255.255.254.0 172.22.0.1 PC3 172.22.0.4 255.255.254.0 172.22.0.1 Subnet B System IP Address Subnet Mask Gateway Address PC1 172.22.2.3 255.255.255.248 172.22.2.1 PC2 172.22.2.4 255.255.255.248 172.22.2.1 PC3 172.22.2.5 255.255.255.248 172.22.2.1 Subnet C System IP Address Subnet Mask Gateway Address Tablet computer 172.22.2.2 255.255.255.128 172.22.2.7 Laptop PC 172.22.2.6 255.255.255.128 172.22.2.7 The network diagram shows the various entities used in forming the network. The various other devices that need to be added to the network for ensuring the basic functionality are hub, bridge, repeater, central office server, firewall and many more. In order to understand the significant of connecting various devices, the architecture of the network need to be robust. An essential element required in the network is the Hub. Being a non-intelligent device the hub is required in the network to broadcast the data from one computer connected o the network to another device. The hub is added to the OSI model's physical layer. Thus, it has no acknowledgement of the different MAC address of the devices connected to the network. Repeater used in the network will amplify the signal while discarding the noise. Repeaters are required for broadcasting over a long distance to prevent the distorted signal. The firewall system is used for security purpose. A firewall system can be placed or connected the router, switch, or in between the internet and router. A firewall has two type of functions, one is packet filter firewall, and another one is proxy filter firewall. Packet filter firewall is used to filter the network packets, and proxy filter firewall is used to bypass the access system. A proxy server is used in proxy filter firewall to check the authorized access. A repeater can be used to in this network. The chief hardware recommendation of the network for basic functionality is a wireless router, wires based connection, and wireless NIC. The wireless router is required for the providing internet access to the components connected to the network. The wireless router acts as the hub of the wired network. Furthermore, a wired base connection or Ethernet connection is required to provide standard networking function in the network. The most vital part of the wireless network required is the Network Information Card (NIC). Usually, the laptops come with inbuilt NIC card, but in order to connect any personal computer on the desktop with the wireless network, the system must have installed NICs. To implement a wireless network few things must be considered, those are The environment creates major influence in a wireless network system. Before place any wireless access point, the environment should be checked. Application support must be enabled in a wireless network system. The application can be simple office application, like an email application, file transfer application, browsing application. It could be remote patient observing in a doctor's facility or voice telephony in a storeroom. The application prerequisites empower the network designer to indicate the material throughput, innovations and items when outlining the framework. Coverage area describes the place where users access the wireless network. The users might need only connectivity in their application. In addition, deliberately consider whether coverage is required in stairwells, lifts, and parking lots. These are hard-to-cover the area, and it can increase the wireless network device cost. By indicating the appropriate coverage, it can be avoid the extra expense for wireless network devices. Dynamic IP- Make sure to recognize whether the users are stationary or mobile, which gives evidence to incorporating upgraded roaming in the configuration. The user of mobile will move about the facility and possible roaming crosswise over IP spaces, making need to oversee IP addresses dynamically. Few users, in any case, might be stationary, for example, remote desktops. Security system describes the wireless network information sensitivity which will navigate the wireless system. The wireless network designer needs to put an authentication in the wireless network system. A robust firewall system needs to be installed in the network to provide security for communication through the network. Bibliography Simmons, J. M. (2014). Optical network design and planning. Springer. Dziubiski, M., Goyal, S. (2013). Network design and defence. Games and Economic Behavior, 79, 30-43. Ramezani, M., Bashiri, M., Tavakkoli-Moghaddam, R. (2013). A new multi-objective stochastic model for a forward/reverse logistic network design with responsiveness and quality level. Applied Mathematical Modelling, 37(1), 328-344. Quigley, T., MacInnis, A. G., Behzad, A. R., Karaoguz, J., Walley, J., Buer, M. (2015). U.S. Patent No. 9,198,096. Washington, DC: U.S. Patent and Trademark Office. Mayoral, A., Lpez, V., Gerstel, O., Palkopoulou, E., de Dios, . G., Fernndez-Palacios, J. P. (2014, March). Minimizing resource protection in IP over WDM networks: Multi-layer shared a backup router. In Optical Fiber Communication Conf.(OFC) (pp. M3B-1). Andrews, P. E., Harris, R., Plum, D. L. (2013). U.S. Patent No. 8,495,190. Washington, DC: U.S. Patent and Trademark Office. Li, Y., He, P., Hu, Y., Chen, C., Nie, J., Liang, Y. (2015). U.S. Patent Application No. 14/879,950. Tongxing, M. A., Pan, L., Yang, R., Jianguo, D. A. N. G. (2014). U.S. Patent Application No. 14/338,409. Scherzer, T., Scherzer, S. (2013). U.S. Patent No. 8,358,638. Washington, DC: U.S. Patent and Trademark Office

Robotics Essays - Robot, Industrial Robot, R.U.R., Mobile Robot

Robotics Two years ago, the Chrysler corporation completely gutted its Windsor, Ontario, car assembly plant and within six weeks had installed an entirely new factory inside the building. It was a marvel of engineering. When it came time to go to work, a whole new work force marched onto the assembly line. There on opening day was a crew of 150 industrial robots. Industrial robots don't look anything like the androids from sci-fi books and movies. They don't act like the evil Daleks or a fusspot C-3P0. If anything, the industrial robots toiling on the Chrysler line resemble elegant swans or baby brontosauruses with their fat, squat bodies, long arched necks and small heads. An industrial robot is essentially a long manipulator arm that holds tools such as welding guns or motorized screwdrivers or grippers for picking up objects. The robots working at Chrysler and in numerous other modern factories are extremely adept at performing highly specialized tasks - one robot may spray paint car parts while another does spots welds while another pours radioactive chemicals. Robots are ideal workers: they never get bored and they work around the clock. What's even more important, they're flexible. By altering its programming you can instruct a robot to take on different tasks. This is largely what sets robots apart from other machines; try as you might you can't make your washing machine do the dishes. Although some critics complain that robots are stealing much-needed jobs away from people, so far they've been given only the dreariest, dirtiest, most soul-destroying work. The word robot is Slav in origin and is related to the words for work and worker. Robots first appeared in a play, Rossum's Universal Robots, written in 1920 by the Czech playwright, Karel Capek. The play tells of an engineer who designs man-like machines that have no human weakness and become immensely popular. However, when the robots are used for war they rebel against their human masters. Though industrial robots do dull, dehumanizing work, they are nevertheless a delight to watch as they crane their long necks, swivel their heads and poke about the area where they work. They satisfy "that vague longing to see the human body reflected in a machine, to see a living function translated into mechanical parts", as one writer has said. Just as much fun are the numerous "personal" robots now on the market, the most popular of which is HERO, manufactured by Heathkit. Looking like a plastic step-stool on wheels, HERO can lift objects with its one clawed arm and utter computer-synthesized speech. There's Hubot, too, which comes with a television screen face, flashing lights and a computer keyboard that pulls out from its stomach. Hubot moves at a pace of 30 cm per second and can function as a burglar alarm and a wake up service. Several years ago, the swank department store Neiman-Marcus sold a robot pet, named Wires. When you boil all the feathers out of the hype, HERO, Hubot, Wires et. al. a re really just super toys. You may dream of living like a slothful sultan surrounded by a coterie of metal maids, but any further automation in your home will instead include things like lights that switch on automatically when the natural light dims or carpets with permanent suction systems built into them. One of the earliest attempts at a robot design was a machine, nicknamed Shakey by its inventor because it was so wobbly on its feet. Today, poor Shakey is a rusting pile of metal sitting in the corner of a California laboratory. Robot engineers have since realized that the greater challenge is not in putting together the nuts and bolts, but rather in devising the lists of instructions - the "software - that tell robots what to do". Software has indeed become increasingly sophisticated year by year. The Canadian weather service now employs a program called METEO which translates weather reports from English to French. There are computer programs that diagnose medical ailments a nd locate valuable ore deposits. Still other computer programs play and win at chess, checkers and go. As a results, robots are undoubtedly getting "smarter". The Diffracto company in Windsor is one of the world's leading

Insecticides essays

Insecticides essays An insecticide is used to kill insects. There are many kinds of insecticides, but organic insecticides are the most commonly used (World Book, 1999). Organic insecticides are split into three different categories: Chlorinated hydrocarbon insecticides, organophosphate insecticides, and carbamate insecticides (World Book, 1999). In this paper, I'll explore how toxic each of these insecticides are, how they affect wildlife, humans, and the environment, and what we can do to help. Some insects, like white flies and mosquitoes, can carry deadly diseases that affect crops, animals and humans. Insects can cause about 5.5 billion dollars in crop and live stock losses every year. Some of the diseases they cause are Cattle Fever and Sheep Scab. The insecticides are used to kill insects and protect livestock (World Book, 1999). Insecticides can also be used on flea treatments for cats, dogs, and other animals (Ackerman, 1996). Organic Insecticides are the most commonly and widely used insecticides. They are synthetic substances made from carbon, hydrocarbon insecticies, organophosphate insecticides (World Book 1999). Chlorinated hydrocarbon insecticides, also know as "organic chlorines", contain chlorine atoms (World Book 1999). Common members of this group are Acaralate, Acarol, Aldrin, BHC, Chlordance, Chlorobenzilate, DDT, dicofol, dieldrin, endosulfan, endrin, heptachlor, kepone, lindane, methoxychlor, mirex, perthen, TDE, and toxaphene (Hamm 1982). They're persistant because after being used once, they can still affect living things for several years. This is because they don't break down chemically so they're found in soil, animal and fish tissue, plants, and water (Hamm, 1982). These, and all persistant insecticides, are trying to be replaced and restricted because they kill bird, fish, and other animals (World Book, 1999). Organophospahte Insecticides contain phosphorus atom (World Book, 1999). Common members o...

The Role of Observations in the Everyday Life Assignment

The Role of Observations in the Everyday Life - Assignment Example What follows are some of my recollections from these occasions. Last week I went to the mall to observe people through a different lens. Our mall is multi-storied and has a variety of shops that one can peruse. A mall is a social place where people from all walks of life come to talk and be themselves. One often associates the mall with teenagers, but I was surprised to notice the number of older people that were there as well. In order to get a good picture of the mall, I sat on a bench outside the food court. From here, I was able to watch people eating, as well as shopping. Teenagers, quite predictably, were loud and boisterous. As I watched, however, I noticed quite a few elderly people using the mall as a place to walk. It was great to see them out in a social atmosphere enjoying some exercise. There was a great deal of non-verbal communication taking place. I noticed the teenagers could seemingly communicate with each other across table simply by their facial expressions. In addition, I did notice a lot of text messaging taking place. This is quite different than I would have thought, but I suppose it makes sense in today’s world. This impacted their interaction by limiting the amount of actual talking that was taking place. In this particular setting, the interaction was quite informal. There were simply groups of people enjoying a day out with their friends. It was refreshing to watch so many people leaving the cares of this world outside and enjoying a few hours of quality time with their friends and family. The assumption I take from this is that social events are needed in our society. There are a lot of distractions in our daily life, and the time we spend with those close to is very important. The impressions I formed involve the notion that communication styles are changing rapidly. Teenagers are moving towards more non-verbal communication, while older adults still prefer to talk face to face. It will be interesting to see how this plays out in the future.  Ã‚