Chemical reactions proceeding until all the reactants are used is a common misconception. Chemical reactions actually behave differently. The general reaction equation is a A + b B → c C +d D in this equation A and B are the reactants forming the products C and D. However‚ unlike the common thought that the reaction ends when it runs out of A and B it actually does not. In most reactions C and D start to react to form A and B at a certain point as you can see in the equation c C + d D → a A + b
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Mole Examples (Avogadro’s Revenge) 1. 2. 3. 4. 5. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 23 Astronomers estimate that there is a mole (6.02 x 10 ) of stars in the universe. One mole of high school chemistry textbooks would cover the USA to a depth of about 320 km (200 miles). Water flows over Niagara Falls at about 650‚000 kL (172‚500‚000 gallons) per minute. At this rate it would take 134‚000 years for one mole of water 23 drops (6.02 x 10 drops) to flow over Niagara Falls. Avogadro’s number (6
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2.MATERIALS and METHODS 2.1. Nature of Reactants 2.1.1 We placed 3mL of 3 M HCl into each of 3 seperate test tubes. Next we added mossy zinc to the first test tubes‚ Sn granules to the second and Cu filings to the third and compared the rates of evolution of hydrogen gas in each test tube. 2.1.2. We mixed 3mL of 0.02 M KMnO4 and 2mL of 3 M H2SO4 in a test tube and stirred using a glass rod. Next‚ we divided the solution into two. We added 2mL of 0.03 M Na2C2O4 solution to the first half and
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Ashley Silva Lab 7: Three Stooges in Chemical Reactions Objective: The purpose of this lab is to experimentally determine the equilibrium constant‚ Kc ‚ for the following chemical reaction: Fe3+ (aq) + SCN-(aq) ↔FeSCN2+(aq) Background Information: A system is at equilibrium when the rate of the forward reaction is the same as the rate of the reverse reaction. There is no change in concentration for the reactants or products at chemical equilibrium. When the system is disturbed there
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In Mexico there are a lot of famous dishes‚ but some of them don’t have a history behind them. Well in this case mole actually has a history to show. Here you will know how the famous dish of mole started‚ the different kinds of mole and how you prepare mole. Many years ago in the city puebla mexico the famous dish of mole was created. Mole was created by nuns to welcome the archbishop. The nuns didn’t have any food to welcome the archbishop they were so desperate they wouldn’t find something to
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between the end point and the equivalence point is that the end point is just an indicator of when the color changes and titration stops. The equivalence point is when the H+ ions are neutralized by OH- ions‚ which occurs when both are used up in the reaction causing the pH to be 7. The molarity of NaOH from the indicator was exactly .500 M‚ but the molarity for the equivalence point from the second derivative was .688 M. This resulted in a range of roughly 27.3%‚ which is way over the 15% error mark
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amounts of product can be calculated in a chemical process. These calculated products are determined using the limiting reagent‚ (the substance that runs out first which stops the reaction) and are called the theoretical yield. The theoretical yield is the amount of product that should be acquired during the experiment if all aspects go perfectly. However‚ due to experimental errors‚ very few labs do so. These results are called actual yield. The percent ratio between the theoretical and actual yield
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I.Introduction Hydatidiform mole is a tumor that forms in the uterus as a mass of cystsresembling a bunch of grapes. Hydatidiform moles occur during the childbearing years‚ and they do not spread outside the uterus. However‚ a malignancy called choriocarcinoma may start from a hydatidiform mole. In its early stages‚ a hydatidiform mole may look like a normal pregnancy. Diagnosis is based on a history of lack of fetal movement‚ a pelvic examination‚ an ultrasound‚ and a blood test
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normal pregnancy progress into a pathological one. It is characterized by the presence of a hydatidiform mole‚ which the chorionic villi around the fetus degenerate and form clusters of fluid-filled sacs‚ resulting in tumor growth that forms in the uterus as a bunch of cysts resembling grape-like vesicles that are visible to the naked eye. Hydatidiform mole (also known as hydatid mole or mola hydatidosa) is type a gestational trophoblastic disease that results from over-production of the tissue
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Physical and Chemical Reactions Lab #4 Alesa Cannon Objective: To investigate the physical and chemical properties of a pure chemical substance. Procedure: 1. Half-fill one well of a 24-well plate with 6 M HCl and half-fill a second well of the 24-well plate with 6 M NaOH. Suck up these chemicals into their labeled pipets for later use. 2. Perform the following steps on each of the substances to be tested. Complete all tests of one substance and record your observations before proceeding
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