Master Chemistry with Fun Quizzes & Brain Teasers!

What is the volume of a 2. 00 M solution that contains 3. 75 moles of solute?
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An analytical chemist is titrating 68.3ml of a 0.3400m solution of aniline c6h5nh2 with a 0.6100m solution of hio3. the pkb of aniline is 9.37. calculate the ph of the base solution after the chemist has added 42.1ml of the hio3 solution to it.
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A metal Q forms an oxide when 10. 4g of it reacts with 7. 48dm of oxygen gas at 27C and a pressure of 100KPa. (i) Determine the formula of the oxide(ii) Calculate the percentage by mass of oxygen in the oxideAtomic masses[ Q=52. 0 O=16. 0]
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The industrial production of hydroiodic acid takes place by treatment of iodine with hydrazine N2H4: 2I2 + N2H4 = 4HI + N2 a) how many grams of I2 needed to react with 36. 7 g of N2H4? b) how many grams of HI are produced from the reaction of 115. 7 g of N2H4 with excess iodine?
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What's the theoretical yield of oxygen from the oxides present in 1. 00 kg sample of lunar soil?
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Solution A Solution BParticle Size of Salt large clumps tiny grainsTemperature of Solvent cold water hot waterLevel of Agitation slow stirring fast stirringWhat conclusion can be drawn from these solutions?A. Solution A will take less time to dissolve, because gently stirring will allow it to combine more evenly. B. Solution B will take longer to dissolve and might have some undissolved salt remaining at the bottom of the solution due to the high temperature. C. Solution B will take less time to dissolve, because hot water will cause some of the salt to evaporate. D. Solution A will take longer to dissolve and might have some undissolved salt remaining at the bottom of the solution due to the low temperature
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How many grams of silver is produced if 83.4 grams of lithium react
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Differentiate between tagatose and leloir pathways
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832 J of energy is used to raise the temperature of an unknown metal from 65oC to 71oC. If the specific heat of the metal is 0. 466 J/g*C, what is the mass of the metal sample? g (five sig figs)
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A compound is made up of 94. 5 g of aluminum and 199. 5 g or fluorine. Determine the empirical formula of the compound. HELPPPP
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Using an experimentally determined value (1. 81010) of Ksp, determine the value for the reaction quotient 'Q' if Ag2CrO4 will precipitate when 5. 00 mL of 0. 0040 M AgNO3 are added to 4. 00 mL of 0. 0024 M K2CrO4
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The evaporation heat of mercury is 296 kJ/ kg. Calculate how much heat needs to be provided to change 50 g of this substance into vapour at its boiling point
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If you apply 1,200 Newtons of force to an object and move it 8 meters, how much work do you do on the object?
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The acid dissociation constant (Ka) for benzoic acid is 6. 3 10 ^-5. Find the pH of a 0. 35 m solution of benzoic acid.
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How many moles of chlorine gas react when 320. 5 grams of aluminum chloride is formed?
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Itea city is considering different water purification methods for the water supply. which fact would help inform the city if cost wasa significant constraint? (1 point)iterreverse osmosis systems are more expensive because of the chlorine treatmentsitenolon exchange systems are more expensive because of the chlorine treatmentsiteno reverse osmosis systems are more expensive because of the use of filters that need replacementitenolon exchange systems are more expensive because of the use of filters that need replacementitemiten
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A. describe the following heat equations, and identify the indicated variables. i. q = mct; identify c. ii. q = mlvapor; identify lvapor iii. q = mlfusion; identify lfusion
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If the pressure of a 7. 2 liter sample of gas changes from 735 torr to 800 torr and the temperature remainsconstant, what is the new volume of the gas? (6. 62 L)
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An unknown gas with a mass of 205 g occupies a volume of 20. 0 L at 273 K and 1. 00 atm. What is the molar mass of this compound?
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Certain amounts of the hypothetical substances A2 and B are mixed in a 3. 00 liter container at 300. K. When equilibrium is established for the reaction the following amounts are present: 0. 200 mol of A2, 0. 400 mol of B, 0. 200 mol of D, and 0. 100 mol of E. What is Kp, the equilibrium constant in terms of partial pressures, for this reaction
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How much heat is required to warm 400. g of ethanol from 25.0c to 40.0c
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Problems with understanding what happens when things burn
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What is the mass of 6. 02 x 10^22 molecules of fluorine gas at stop
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How many grams of Gold (Il) Sulfate were reacted if 4. 6 x 1022 atoms of Gold were produced? 3 Ca + AU2(504)3 =->3 CaS04 +2 Au
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