Master Chemistry with Fun Quizzes & Brain Teasers!

What volume of oxygen gas at STP would be neededto react completely with 1. 55 g of aluminum?
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A) Why weight of water is converted to true volume. What are the three corrections that are considered?
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What is the normal boiling point of a 3.45mol solution of kbr that has density of 1.10gml?(ka for h2o is 0.512c kg/mole)
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During an experiment, the percent yield of calcium chloride from a reaction was80. 34%. Theoretically, the expected amount should have been 115 grams. What wasthe actual yield from this reaction? (5 points)CaCO3 + HCI - CaCl2 + CO2 + H2O1) 90. 1 grams2) 92. 4 grams3) 109. 2 grams4) 115. 3 grams
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Select the correct answer.where are globular clusters usually found?oa. diskob. nucleusoc. interstellar spaceod. halo
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259 mL of gas is collected at 112 kPa of pressure. What will be the volume at standard pressure, assuming the temperature remains constant? Remember, STP is standard temperature (273 K) and standard pressure (1 atm). Round your answer to 3 significant figures. Love you so much if you can answer x
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Justus has a flexible container that holds 200 milliliters of air at a temperature of 300 kelvins and a pressure of 100 kilopascals. Justus wants to decrease the volume of the air inside the container to 100 milliliters. He can do this either by changing the temperature to kelvins or by changing the pressure to kilopascals
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1. A 35. 3 g of element M is reacted with nitrogen to produce 43. 5 g of compo und M3N2. What is (i) the molar mass of the element and (ii) name of the element?
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Which pair of elements has the most similar Lewis structures?N and SN and PF and NeF and Ar
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A container is filled with helium and nitrogen gas. A hole is poked into the container and the gases areallowed to effuse. (A) Which gas would effuse faster? (B) Calculate the rate of effusion of helium tonitrogen gas. (C) If it takes nitrogen gas 22 sec to effuse, how long would it take the helium gas?
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Consider the reaction below. At equilibrium, which species would be present in higher concentration? Justify your answer in terms of thermodynamic favorability and the equilibrium constant. 4NH(g) + 3 O (g) 2N + 6 HO(g) G = -1360 kJ/mol
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How can you prepare 250mL of an aqueous solution using 8. 00g of solidNaOH?
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A soft lump of clay has water run on top of it. Most of the water and clay runs off the table. After a long while, the water is turned off and allowed to dry. There is no clay left; instead, there are small pebbles and other types of components left on the table. Which natural process is this modeling?
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What could be a third quantum number of a 2p3 electron in phosphorus,152252p 3s23p3?A. M = -1B. M = 3c. M = 2D. M = -2
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0. 063L solution of Ba(OH02 is neutralized by 0. 0234L of a 1. 52 M HNO3 solution. What is the concentration of the Ba(OH)2 solution
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How many grams of solute are needed to make 2. 50L of a 1. 75M solution of Ba(NO3)2
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What would be expected effects on people if alpine and tidewater glaciers melted?
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What issue is California facing in regards to its coastline?What are some causes besides natural erosion that are affecting this issue? Cite specific textual evidence from the reading and your research. What techniques are being used to address this issue? Cite specific evidence from your research. How effective do you think these techniques will be?What are advantages and disadvantages of each of the techniques? How do you think the eroding coastline will affect the residents of California?
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The molar heat of fusion for Iodine is 16. 7 kJ/mol. The specific heat capacity liquid Iodine is 0. 054 J/g degrees C. Calculate the amount of energy (in KJ) required to melt 352 g of solid Iodine and then heat the liquid to 180 degrees C? The melting point of Iodine is 114 degrees C
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How could you prepare the following compound using a starting material that contains no more than three carbons? CH3CH2CHCHCH, with an NH2 group attached to the third (from left to right) carbon, a CH3 group attached to the fourth carbon, and an oxygen atom double-bonded to the fifth carbon
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Acetylene (c2h2) is a flammable gas used in welder's torches. Styrene (C8H8) is used to make packing peanuts. What is the empirical formula for each? Describe why the empirical formula might be useful in the lab setting but not useful for predicting the properties and/or functions of materials
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1. Write a mechanism for the E1 elimination reaction of 2-methylcyclohexanol with phosphoric acid. Be as complete as possible and show electron flow for all steps. You should clearly indicate the mechanistic pathways that lead to each of the products formed in the reaction (there is no need to duplicate common steps, but at some point the pathways diverge)
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A sample of iodine-131 has an activity of 200 mCi. If the half-life of iodine-131 is 8. 0 days, what activity is observed after 16 days?0. 5 half livesStep [1]: Determine the number of half lives. x 1285. 88 x10-37mci16 days128 half lives2 half lives80 half lives1 dayStep [2]: Find the final activity. 50. 0 mci200. Mci200. Mci(initial activity)
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If 32.0 g of hcl is to be diluted to make a 4.80 m solution, how much water should be added? question 7 options: 0.18 l 0.92 l 6.7 l 18 l
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