Master Chemistry with Fun Quizzes & Brain Teasers!

Deduce the change in entropy of a gas, in kJ, which contains 105 particles after the volume changes to fifty times its original value
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You are asked to make a 1. 5 L solution of. 35 M HCl by diluting concentrated 16. 0 M HCI. Whatvolume of acid would be needed to make the dilution?
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3. A certain nut crunch cereal contains 11. 0 grams of sugar (sucrose, C12H22011) perserving size of 60. 0 grams. How many servings of this cereal must be eaten to consume0. 0350 moles of sugar?
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Ketone 1 gives two different bicyclic products depending on the base used: when treated with potassium tert-butoxide at room temperature, it produces ketone 2, while when treated with LDA at low temperatures and then heated, it produces ketone 3. Write arrow-pushing mechanisms for the formation of both 2and 3and explain why the reaction conditions favor each product
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1: calculate the ph of a 0.25m solution of h3o+2: calculate the ph of a 6.3x10-8m solution of h3o+3: look at your answer for 4 and 5 which one is a base? 4: look at 4 and 5 which one is a strong acidplease show your work
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What is the molarity of a NaOH solution if 25. 0 mi is required to completely neutralize40. 0 ml of a 1. 5 M solution of H2SO4?
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Find the mass of a sample of water if its temperature dropped 24. 8Cwhen it lost 870 J of heat. Hint. Which formula are you going to use? Seeinteractive PPT. Don't forget the unit. Show your work. How much heat is required to warm a 135g cup of water from 15 C to35C? Hint: the water is in a cup so what state of matter and specific heat?Show your work.
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Fossil fuels are the largest contributor of the ___________ gas carbon dioxide. this causes health and environmental issues.question 2 options:inertgreenhousepoisonousblue
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A 3. 245g sample of titanium chloride was reacted with sodium metal, producing sodium chloride and metallic titianium. After the sodium chloride was washed out, the remaining titanium metal weighed 0. 819g. What is the empirical formula of the titanium chloride
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For the same procedure described in the chemical equilibrium lab handout for determining k, 15.0 ml of organic solution was added to 71.0 ml of ki aqueous solution at 307.25 k. both the aqueous and organic solutions were prepared at 298.15 k with the apparent concentration of 0.0716 m for the i-(aq) and 0.0044 for the i2(org) solutions, respectively. after mixing these immiscible solutions, the final concentration of i2 in the organic layer was determined to be 0.00077 m through uv-vis spectroscopy. in a separate experiment, the partition coefficient was found to be k = 0.046 at 301.56k.required:a. determine the approximate equilibrium constant, k without making any temperature correctionb. what is the percentage enor for using the non- corrected k rather than the corrected k?
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(01. 05 MC) During an experiment a thermometer was placed in a beaker containing hydrogen peroxide. The following observations were recorded when yeast granules were added to hydrogen peroxide. Observation 1: Fizzing and bubbling took place. Observation 2: The temperature began to rise. Based on the observation, justify the type of change (physical or chemical) that took place
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4. the bohr equation for the hydrogen atom is en = -2.1810-18 j/n2. what is the energy in j of the lowest excited state?a.2.4210-19 b.1.6610-18 c.5.4510-19 d.2.1810-19 e.2.1810-18
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Benzene at 20C has a viscosity of 0. 000651 Pa. S. What shear stress is required to deform this fluid at a velocity gradient of 4900 s-1 ?
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6. Consider the molecule xylene; and predict its reaction behavior with1. Bromine solution2. KMn043. AlCl3 and CHCI;
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You have a sample of gas with a volume of 22. 4 L, a pressure of 1663 mmHg, and a temperature of 83 C. How many moles of gas are in the sample?
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A 0. 495M solution of nitrous acid, HNO2, has a pH of 1. 83a) Find the percent ionization of nitrous acid in this solution. You may assume the temperature is 25 oC. b) Calculate the value of Ka for nitrous acid. You may assume the temperature is 25 oC. c) Using the value of Ka you determined in b), calculate the pH of a solution formed by adding 1. 0 g of NaNO2 to 750 mL of 0. 0125M HNO2. You may assume the temperature is 25 oC
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4A local pet store expands and begins selling exotic organisms. The exotic organisms areeasy to care for when they are younger, but become very difficult to control as they getolder. The owners often decide to release their new pets into the local environmentrather than continue to care for them. The released animals do not have any naturalenemies and their population expands unchecked. How will this affect the biodiversity ofthe ecosystem?FIt introduces an invasive species, which will increase the biodiversity of theecosystem. It introduces an invasive species, which will decrease the biodiversity of theGecosystem. H It introduces a native species which will not affect the biodiversity of the ecosystem. It reintroduces a native species, which will decrease the biodiversity of theecosystem.
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What volume of 0.8m naoh would be required to titrate 300 ml of 0.6 m phosphoric acid? assume a 1:1 mole ratio.
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Many smoke detectors use americium-241 to detect very small particulates in the air. This is done by using a stream of radioactiveparticles that can be stopped by the small smoke particulate. Which type of radiation is MOST LIKELY used in a smoke detector, asit can be stopped by something this small?
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The other station has a solution of sodium bicarbonate (formula: nahco) and citric acid (formula: hoc(co2h)(ch2co2h)2). na2hco3 (aq) + h3c3h5o7(aq) na3c3h5o7(aq) + h2co3 (aq)type of reaction? ___________________________________the carbonic acid produced in this reaction keeps reacting to produce water and carbon dioxideh2co3 (aq) h2o(l) + co2(g)type of reaction? decompositioniii. notice the symbols inside the parentheses after the formula of the compounds. what do they mean?slgaq
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A sample of lithium sulfate, Li2SO4, has 2. 94 x 1023 atomsof lithium. How many moles of lithium sulfate is the sample?
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Air enters the body through the ________ and travels down the ________ to the lungs. the ______ contracts to allow space for the _________ to take in air. then, the ______ relaxes causing the _____ to release air.
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Find the molarity of 194. 55 g of sugar (C12H22O11) in 250. ML of water
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Please help ill give brainiest red tape can be used to repair a broken taillight a car. In one or two sentences, explain how different colors of light aretransmitted, reflected, and absorbed by this kind of tape. (2 points)
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