Calorimetry and Heat Flow Worked Chemistry Problems

Calorimetry is the study of heat transfer and changes of state resulting from chemical reactions, phase transitions, or physical changes. The tool used to measure heat change is the calorimeter. Two popular types of calorimeters are the coffee cup calorimeter and bomb calorimeter. These problems demonstrate how to calculate heat transfer and enthalpy change using calorimeter data. While working these problems, review the sections on coffee cup and bomb calorimetry and the laws of thermochemistry. Coffee Cup Calorimetry Problem The following acid-base reaction is performed in a coffee cup calorimeter: H(aq) OH-(aq) → H2O(l) The temperature of 110 g of water rises from 25.0 C to 26.2 C when 0.10 mol of H is reacted with 0.10 mol of OH-. Calculate qwaterCalculate ΔH for the reactionCalculate ΔH if 1.00 mol OH- reacts with 1.00 mol H Solution Use this equation: q (specific heat) x m x Δt Where q is heat flow, m is mass in grams, and Δt is the temperature change. Plugging in the values given in the problem, you get: qwater 4.18 (J / g ·C;) x 110 g x (26.6 C - 25.0 C)qwater 550 JΔH -(qwater) - 550 J You know that when 0.010 mol of H or OH- reacts, ΔH is - 550 J: 0.010 mol H ~ -550 J Therefore, for 1.00 mol of H (or OH-): ΔH 1.00 mol H x (-550 J / 0.010 mol H)ΔH -5.5 x 104 JΔH -55 kJ Answer 550 J (Be sure to have two significant figures.)-550 J-55 kJ Bomb Calorimetry Problem When a 1.000 g sample of the rocket fuel hydrazine, N2H4, is burned in a bomb calorimeter, which contains 1,200 g of water, the temperature rises from 24.62 C to 28.16 C. If the C for the bomb is 840 J/C, calculate: qreaction  for combustion of a 1-gram sampleqreaction  for combustion of one mole of hydrazine in the bomb calorimeter Solution For a bomb calorimeter, use this equation: qreaction   -(qwater   qbomb)qreaction   -(4.18 J / g ·C x mwater  x Δt C x Δt)qreaction   -(4.18 J / g ·C x mwater   C)Δt Where q is  heat flow, m is mass in grams, and Δt is the temperature change. Plugging in the values given in the problem: qreaction   -(4.18 J / g ·C x 1200 g 840 J/C)(3.54 C)qreaction   -20,700 J or -20.7 kJ You now know that 20.7 kJ of heat is evolved for every gram of hydrazine that is burned. Using the  periodic table  to get  atomic weights, calculate that one mole of hydrazine, N2H4, weight 32.0 g. Therefore, for the combustion of one mole of hydrazine: qreaction   32.0 x -20.7 kJ/gqreaction   -662 kJ Answers -20.7 kJ-662 kJ

Coal Seam Gas Coal Gas Essay - 1162 Words

Coal Seam Gas What is coal seam gas? Coal Seam Gas (CSG) is a natural methane gas found in coal seams made by coal forming under the earth for millions of years. Countries such as the United States and China have utilised it for energy needs. Methane lines the inside of the coal cracks, pores and micro-pores and is found in the open fractures (cleats) and seams. (1) CSG is also known as Coal bed methane (CBM) and Unconventional Gas. Unlike coal itself, the gas lacks hydrogen sulphide. It is extracted by drilling a steel encased hole into the coal seam known as fracking. The gas is released from the coal as water is pumped out, the water and gas are separated and the gas then compressed into a natural gas pipeline. Where is it found in Australia? The CSG industry in Australia is around 20 years old, with the first business construction of a well occurring in Queensland in the mid 1990s. Australia has substantial identified reserves of CSG occurring in coal basins in Queensland, New South Wales, Victoria, Western Australia, South Australia and Tasmania. (2) The biggest known basin being the Surat basin: which occupies 300,000 km2 of Southern Queensland and Northern New South Wales. (1) Fig 1.0 – The major basins in Australia that hold coal seam gas. (1) What is fracking? ‘Fracking’ (Hydraulic Fracturing) is the technique of mining that extracts oil or gas from the underground via wells drilled into the seam. (3) Steel pipes are then put into the newly drilled hole andShow MoreRelatedCoal Seam Gas2081 Words   |  9 PagesWHAT IS COAL SEAM GAS (CSG)? CSG is a naturally occurring methane gas which is known as Coal Bed Methane (CBM). It is a-by product of ancient plant matter that has formed over millions of years by the same natural processes which produce coal. 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Introduction As the world’s population is increasing, the demand of the energy usage is also increasing and the direct solution is to find and implement newer energy sources. As a consequence, sometimes farming lands are exploited Mining companies are investigating and discovering different types of energy sources to meet the energy demand. One option for a different kind of energy supply is coal seam gas. Coal seam gasRead MoreFossil Fuel And Fossil Fuels1485 Words   |  6 Pagesfossil fuels were formed. Fossil fuels were converted into coal, oil, and natural gas (U.S Department of Energy, 2013). Fossil fuels are considered to be non-renewable energy. Fossil Fuels are considered to be this because they are a one-time energy source. Since it takes millions of years for fossil fuels to form, once they are all gone they are basically gone forever (Alterative Energy, 2015). One type of fossil fuel is coal. Coal is a hard, black colored, rick-like substance that is made up

Personal Life and William Hazlitt Free Essays

Many people say will say that â€Å"money cannot buy happiness. † Nineteenth-century author, William Hazlitt, wrote â€Å"On The Want of Money† to put forward his belief that a life without money is a life full of misery. Hazlitt uses negative diction, parallelism, and specific syntax to show that a person could not lead a happy life without money. We will write a custom essay sample on Personal Life and William Hazlitt or any similar topic only for you Order Now In his writing, Hazlitt uses negative diction to discuss the importance of money in one’s life.. Hazlitt uses words like â€Å"crabbed† â€Å"morose† and â€Å"querulous† to show the discontent one would feel without money. With his gloomy word choice, Hazlitt establishes a negative tone and gives his audience a clear idea of what a miserable life one would have without money. Doing this, he suggests the idea that the poor have no control of their lives because they don’t have the money to change the way their miserable lives. Equally important, Hazlitt uses parallelism to stress the importance of money in a happy life and show the dreadful instances a person in poverty can go through. He states that living without money, â€Å"it is to live out of the world, or to be despised if you come into it†¦it is to be scrutinized by strangers, and neglected by friends†¦Ã¢â‚¬  By doing this, Hazlitt explains how a person without money cannot possibly be happy, because he or she will be disliked by everyone around them. The dark mood set by all of the examples Hazlitt gives portrays what Hazlitt thinks a life without money would be: difficult, lonely and overall unhappy Furthermore, Hazlitt uses specific syntax to prove his point that one without money cannot possibly be happy. He uses one long sentence that stretches from lines 2 to 47 to put an emphasis on the fact that people without money lead a life filled with misery. Hazlitt’s use of the lengthy sentence represent all of the never-ending obstacles one without money faces. Hazlitt’s purpose in doing this is to accent his idea that a person without money does not lead a happy life. By using one long sentence instead of many shorter ones, Hazlitt makes the reader feel hopeless and as if they were drowning in their distress Overall, Hazlitt uses negative diction, parallelism and syntax to show his belief that money is what gives you happiness in life. By stating so many examples and employing his strategies, Hazlitt makes reader feel deprived of their hope of being happy in this world without money, which is exactly what the author’s purpose was. To be without money is to be â€Å"†¦dissatisfied with every one, but most so with yourself.. † How to cite Personal Life and William Hazlitt, Essay examples

Blood Transfusion free essay sample

The purpose of this module is to teach the clinical RN the basics of blood, how to administer a blood/blood component transfusion safely, and the hazards of transfusion related to blood administration. This module is indicated for teaching purposes based on the fact that the NHS requires at least quarterly review of blood usage, oversight of blood transfusion practices, documentation of blood transfusion errors, and evidence of corrective actions taken. Results of one study found that individuals lack of knowledge and training, along with inadequate policies and procedures, were the key elements in more than 350 blood transfusion-associated deaths (Bower amp; Craig, 1997) What is a Blood Transfusion? A blood transfusion is a safe, common procedure in which blood is given to you through an intravenous (IV) line in one of your blood vessels. Blood is transfused either as whole blood (with all its parts) or, more often, as individual parts. The individual parts include red blood cells, platelets, clotting factors, and plasma. Each year, almost 5 million Americans amp; British need a blood transfusion. While most blood transfusions go well, mild complications can occur and serious problems may develop. The Individual Parts Defined Red Blood Cells -the most numerous blood cell, about 5,000,000 per microliter. Red blood cells make up about 40% of our total blood volume, a measure called the hematocrit. Their color is caused by hemoglobin, which accounts for nearly all of the red cell volume. Hemoglobin is the critical protein that transports oxygen from our lungs to the tissues. Red blood cells are normally shaped as round, biconcave discs. Red Blood Cells Image obtained from http://embryology. med. unsw. edu. au/Notes/heart20. htm) Platelets -the smallest of the three major types of blood cells, are only about 20% of the diameter of red blood cells and the normal platelet count is ~150,000-350,000 per microliter of blood. The principal function of platelets is to prevent bleeding. Platelets (Image obtained from http://ouhsc. edu/platelets/Platelets/platelets%20intro. html) Clotting Factors -proteins in the blood that control bleeding. Plasma -a pale yellow fluid that consists of about 92% water and 8% other substances, such as proteins, ions, nutrients, gases, and waste products. It is a colloidal solution which is a liquid containing suspended substances that do not settle out of solution. Most of the suspended substances are plasma proteins, which include albumins, globulins, and fibrinogen. Plasma volume remains relatively constant. Normally, water intake through the digestive tract closely matches water loss through the kidneys, lungs, digestive tract, and skin. Plasma (which is in the yellow) Image obtained from : http://www. mhhe. com/biosci/esp/2001_saladin/folder_structure/tr/m1/s2/ Brief History of Blood Transfusions 665 The first Blood transfusions of record take place. Animal experiments conducted by Richard Lower, an Oxford physician started as dog-to-dog experiments and proceeded to animal-to-human over the next two years. Dogs were kept alive by the transfusion of Blood from other dogs. 1795 In Philadelphia an American physician, Philip Syng Physick, performed the first known human Blood transfusion, although it was not published. 1818 James Blundell, a British obstetrician, performed the first successful transfusion of human Blood to a patient for the treatment of postpartum hemorrhage. Therefore, a group A individual can receive blood only from individuals of groups A or O (with A being preferable), and can donate blood to individuals with type A or AB. * Group B – has only the B antigen on red cells (and A antibody in the plasma). Therefore, a group B individual can receive blood only from individuals of groups B or O (with B being preferable), and can donate blood to individuals with type B or AB. * Group AB – has both A and B antigens on red cells (but neither A nor B antibody in the plasma). Therefore, an individual with type AB blood can receive blood from any group (with AB being preferable), but can donate blood only to another type AB individual. * Group O – has neither A nor B antigens on red cells (but both A and B antibody are in the plasma). Therefore, a group O individual can receive blood only from a group O individual, but can donate blood to individuals of any ABO blood group (i. e. A, B, O or AB). If anyone needs a blood transfusion in an extremely dire emergency, and if the time taken to process the recipients blood would cause a detrimental delay, O Negative blood can be issued. Blood Administration * Obtain Signed Consent for the administration of blood products * Check the Drs Order * Determine Clients Allergies and previous transfusion reactions (this can be assessed by simply asking the client if they have had a transfusion before and how they tolerated it) * Obtain baseline vitals and then per hospital/institution policy * Utilize #18 gauge needle * Check Crossmatch Record With 2 Nurses: * ABO- Group * RH Type * Clients Name, Date of Birth and Medical Number * Expiration Date * Administer Immediately- do not store the blood or leave it. If for any reason the blood/blood components are not to be hung, blood may be sent back to Blood Bank (check hospital policy and procedure as most institutions require that blood/blood products must be administered within 30 minutes upon receipt) * Do not warm the blood unless there is a risk of hypothermic response- Then Only by specific blood warming equipment * Never add any medications to blood products * Infuse each unit over 3-4 hours but no longer than 4 hours   Transfusion Reactions Occurs in the first 10-15 minutes or first 50 cc of Blood Reactions can be ALLERGIC, FEBRILE, or HEMOLYTIC (Utilize the Acronym AFH for memorization purposes)   ALLERGIC Signs and Symptoms include the following: * Facial flushing * Hives * Rash FEBRILE Signs and Symptoms include the following: * Fever * Chills * Anxiety * Headache * Tachycardia * Tachypnea HEMOLYTIC Signs and Symptoms include the following: * v Blood Pressure * Tachypnea * Fever * Chills * Apprehension * Headache * Tachycardia * Chest Pain or Lower Back Pain Recent Facts amp; Statistics Regarding Transfusions * Hemolytic transfusion reactions occur in 1 per 40,000 transfused units of packed RBCs. Nonhemolytic febrile reactions and minor allergic reactions are the most common transfusion reactions, each occurring in 3-4% of all transfusions. Nonhemolytic febrile reactions and extravascular hemolysis are observed more commonly in patients who have developed antibodies from prior transfusions. * Anaphylactic reactions occur in 1 per 20,000 transfused units. * Due to improved preventative measures, the incidence of GVH disease is less than 0. 15% * Transfusion-related acute lung injury complicates 0. 1-0. 2% of all transfusions. Risk of transfusion-related hepatitis B is 1 per 50,000 units transfused. Risk for hepatitis C is 1 per 3000-4000 units transfused. * Risk of transfusion-related HIV infection is 1 per 150,000 units transfused. (Kardon, 2009) What do you do if you suspect a Transfusion Reaction? STOP the transfusion immediately * Maintain the line with Normal Saline VERIFY patient identification * Hospital armband, Typenex band, and blood bag must be identical NOTIFY the patients physician STAT * Treat the signs per Drs order and Monitor Vitals * If requested by the physician, initiate transfusion reaction work up NOTIFY Blood Bank STAT Check the Policies/Procedures of the facility at which you are employed * You may have to bag the blood component, IV tubing, filters and all labels in a biohazard bag and it may have to be submitted/returned back to the laboratory as further testing of the components may be clinically warranted (It is a standard policy at Maricopa Medical Center that those components are submitted back to the lab as routine Microbiology cultures are performed to ensure the sterility of the blood) * Additional forms may be required to complete (i. . Transfusion Reaction Forms) * Further samples may be collected from the patient (i. e. Urine, blood samples, etc.