Chemistry concepts and calculations

a student determines the molar mass of a liquid unknown by the method used in th

a student determines the molar mass of a liquid unknown by the method used in this experiment. She found that the equilibrium temperature of a mixture of ice and water was 1.0 deg…

a student dispensed 20.00 mL of 2x10^-5 M blue #1 solution into a test tube. He

a student dispensed 20.00 mL of 2x10^-5 M blue #1 solution into a test tube. He then added 2.00 mL of NaCl solution and 2.00 mL of 2.50 % bleach solution. a) calculate the molarit…

a student following the procedure in this experiment prepared three solutions by

a student following the procedure in this experiment prepared three solutions by adding 11.50, 23.00, and 34.50 mL of a 7.60 x 10-2 M NaOH sloution to 50.00 mL of a 0.112M soution…

a student following the procedure in this experiment prepared three solutions by

a student following the procedure in this experiment prepared three solutions by adding 11.50, 23.00, and 34.50 mL of a 7.60 x 10-2 M NaOH sloution to 50.00 mL of a 0.112M soution…

a student hangs wet clothes outdoors on a winter day when the temperature is -15

a student hangs wet clothes outdoors on a winter day when the temperature is -15 C. after a few hours, the clothes are found to be fairly dry. describe the phase changes in this d…

a student has a water sample containing 0.503 g of NaH2PO4*H2O dissolved in the

a student has a water sample containing 0.503 g of NaH2PO4*H2O dissolved in the water. Each mole of NaH2PO4*H2O results in 1 mole of PO4 -3 dissolved in the water. The student pre…

a student investigated the effect of changing reactant concentrations on the rat

a student investigated the effect of changing reactant concentrations on the rate of the reaction: H2O2 (aq) + 2 H+ (aq) + 2 I– (aq) ¾® I2 (aq) + 2 H2O (aq). The student made up f…

a student is attempting to dissolve a solid for a recrystalization.the student i

a student is attempting to dissolve a solid for a recrystalization.the student is told how much solid is presentand how soluble the solid is in the solvent at the boiling point of…

a student is attempting to dissolve a solid for a recrystalization.the student i

a student is attempting to dissolve a solid for a recrystalization.the student is told how much solid is presentand how soluble the solid is in the solvent at the boiling point of…

a student is studying the equilibrium described by ng ry, ed A student is studyi

a student is studying the equilibrium described by ng ry, ed A student is studying the equilibrium described by Equation 19. 4. heat + CoSO4 7 H20(s, pink) + 7 SOCl2(1) CoSO4(s, b…

a student mixed 4.00g of zinc (mm=65.4) with 8.00g ofsulphuric acid (mm=98) **mm

a student mixed 4.00g of zinc (mm=65.4) with 8.00g ofsulphuric acid (mm=98) **mm=molar mass** a)how many grams of hydrogen gas will be produced? b)which reactant is the limiting r…

a student places Mg electrode in 1 M solution of MgSO4 and in another beaker pla

a student places Mg electrode in 1 M solution of MgSO4 and in another beaker places Cu electrode in 1 M solution of CuSO4. A salt bridge composed of NaCl connects the two beakers …

a student reacted 0.500 g of Pb(NO3)2 with .750 g of KI according to the reactio

a student reacted 0.500 g of Pb(NO3)2 with .750 g of KI according to the reaction Pb(NO3)2 + 2KI ---> PbI2 + 2KNO3 a) how many moles of Pb(NO3)2 were used? b) how many moles of…

a student reported the following composition of an unknown mixture: 25% NH4Cl, 3

a student reported the following composition of an unknown mixture: 25% NH4Cl, 30% NaCl, and 50% SiO2. Assuming the student's calculations are correct, explain the student error i…

a student started with a stock solution of I2 in methylene chloride, and extract

a student started with a stock solution of I2 in methylene chloride, and extracted the methylene chloride with a 0.20 M I- solution would you expect the student to get similar or …

a student used a 25 ml bulb pipette to deliver an aliquot of glucose solution in

a student used a 25 ml bulb pipette to deliver an aliquot of glucose solution into a flask. The inherent uncertainty associated with the pipette was etched on the glass ((+or-)0.0…

a student wants to determine a student wants to determine a student wants to det

a student wants to determine a student wants to determine a student wants to determine a student wants to determine Ch. Ex. 29c - cp29c_Wavelength from Emission Energy 1 out of 3 …

a student was asked to determine the percentage of each component in a mixture o

a student was asked to determine the percentage of each component in a mixture of PbCl2 and CaCO3 Mass of mixture = 4.85 g Mass of recovered CaCO3 = 3.21 g Mass of recovered PbCl2…

a student ways an empty flask and stopper in find the mass to be 54.868g. she th

a student ways an empty flask and stopper in find the mass to be 54.868g. she then adds about 5 ml of unknown liquid and heats the flask in a boiling water bath 100°C. after all t…

a stunning stranger across the table then spoke: \"Hi, my name is Jerry. I\'m a

a stunning stranger across the table then spoke: "Hi, my name is Jerry. I'm a wealthy SMU student. Could you help me determine the specific gravity of my piece of metal?". The stu…

a stunning stranger across the table then spoke: \"Hi, my name is Jerry. I\'m a

a stunning stranger across the table then spoke: "Hi, my name is Jerry. I'm a wealthy SMU student. Could you help me determine the specific gravity of my piece of metal?". The stu…

a total of 0.400 L of hydrogen gas is collected over water at 18 C. The total pr

a total of 0.400 L of hydrogen gas is collected over water at 18 C. The total pressure is 742 torr, if the vapor pressure of water at 18 C is 15.5 torr, what is the partial pressu…

a turbine operates by the impact of a high velocity jet of steam against the tur

a turbine operates by the impact of a high velocity jet of steam against the turbine blades. The steam leaves the turbine at a lower velovity. For the turbine depicted, steam from…

a typical Body contains 6 liters of blood. The hemoglobin content of blood is ab

a typical Body contains 6 liters of blood. The hemoglobin content of blood is about 15. grams / 100 milliliters of what the approximation molecule weight of hemoglobin is 64500 mi…

a u-tube has a semipermeable membrane in the middle. the left side has a pure li

a u-tube has a semipermeable membrane in the middle. the left side has a pure liquid. the right side has a concentrated solution. what can be observed about the liquid levels? a. …

a value of geathan Select one semperature ranges are found in nothem hemaphere i

a value of geathan Select one semperature ranges are found in nothem hemaphere igh pressue systen b. nthem hemisphere low presu system b. particularly cloudy a d. southern hemsphe…

a value of geathan Select one semperature ranges are found in nothem hemaphere i

a value of geathan Select one semperature ranges are found in nothem hemaphere igh pressue systen b. nthem hemisphere low presu system b. particularly cloudy a d. southern hemsphe…

a vial containing a sample of finely powdered iron ore is found to weigh 9.8117

a vial containing a sample of finely powdered iron ore is found to weigh 9.8117 g. After most of the ore sample was poured into a beaker, the nearly empty vial weighed 6 9.6075 g.…

a volume of 44 L. is filled with 2.0 moles of helium. What is the ballaes, if 3.

a volume of 44 L. is filled with 2.0 moles of helium. What is the ballaes, if 3.0 moles off heliom gas are added, to give a total of 5.0 muoles FNOURE7 Avogedro's aw M 8.7 Calcula…

a warm hotplate, and heat gently. After 3-4 minutes, transfer the beaker to a ce

a warm hotplate, and heat gently. After 3-4 minutes, transfer the beaker to a ceramic pad using beaker tongs, and allow any un-dissolved solid to settle and the beaker and its con…

a weak acid is 5% ionized at equilibrium. Therefore, we can say that the ionizat

a weak acid is 5% ionized at equilibrium. Therefore, we can say that the ionization reaction is ____ favored because ___ a. product; the amount of products << the amount of …

a weather balloon is inflated to a volume of 28.9 L at a pressure of 753 mmHg an

a weather balloon is inflated to a volume of 28.9 L at a pressure of 753 mmHg and a temperature of 25.0•C. The balloon rises in the atmosphere to an altitude where the pressure is…

a weighed amount of sodium chloride is completley dissolved in a measured volume

a weighed amount of sodium chloride is completley dissolved in a measured volume of 4.00M ammonia solution at ice temperature, and carbon dioxide is bubbled in. Assume that sodium…

a weighed amount of sodium chloride is completley dissolved in a measured volume

a weighed amount of sodium chloride is completley dissolved in a measured volume of 4.00M ammonia solution at ice temperature, and carbon dioxide is bubbled in. Assume that sodium…

a weighed amount of sodium chloride is completley dissolved in a measured volume

a weighed amount of sodium chloride is completley dissolved in a measured volume of 4.00M ammonia solution at ice temperature, and carbon dioxide is bubbled in. Assume that sodium…

a weighed amount of sodium chloride is completley dissolved in a measured volume

a weighed amount of sodium chloride is completley dissolved in a measured volume of 4.00M ammonia solution at ice temperature, and carbon dioxide is bubbled in. Assume that sodium…

a x c The organic compound Di-t d/ibis/view.php?id-2907077 /12/2016 06:00 PM 36.

a x c The organic compound Di-t d/ibis/view.php?id-2907077 /12/2016 06:00 PM 36.8l100 12/12/201601:28 AM Print Calculator Periodic Table on 3 of 32 Incorrect neral Chemistry 4th E…

a) (5 points) Use the following bond energies to estimate the value of the stand

a) (5 points) Use the following bond energies to estimate the value of the standard heat of formation (AH 5. of gas phase ammonia from its elements in their standard states. N2(9)…

a) -1153 kJ b) -1124 kJ c) -1395 kJ d) -1199 kJ a) -765 J/mol K b) -410.9 J/mol

a) -1153 kJ b) -1124 kJ c) -1395 kJ d) -1199 kJ a) -765 J/mol K b) -410.9 J/mol K c) 763.8 J/mol K d) -252.5 J/mol K a) 4023 J/mol K b) -761 J/mol K c) 3258 J/mol K d) -4788 J/mol…

a) 0.01M CH3COONa Weak base CH3COO- + H2O CH3COOH + OH- Kb = [CH3COOH

a) 0.01M CH3COONa Weak base CH3COO- + H2O <--------> CH3COOH + OH- Kb = [CH3COOH][OH-]/[CH3COO-]= 5.71×10^-10 at equillibrium [CH3COOH] = x [ OH-] = x [ CH3COO- ] = 0.01 - x…

a) 0.0400 mol of PH3 gas (MM=33.9976 g/mol) effuses through an orifice in 35 sec

a) 0.0400 mol of PH3 gas (MM=33.9976 g/mol) effuses through an orifice in 35 seconds. How much nitrogen will effuse thru the same orifice in 35 seconds under identical conditions?…

a) 0.10 M NH4Cl b) 0.10 M H3BO3 c) 0.10 M Na2CO3 d) 0.10 M Na2CO3 mixed with 0.1

a) 0.10 M NH4Cl b) 0.10 M H3BO3 c) 0.10 M Na2CO3 d) 0.10 M Na2CO3 mixed with 0.10 M NaHCO3 Give an exmaple of how one of these pH values would be used for the evaluation of equili…

a) 0.20 cm b) 1.7 cm c) 8 cm d) 6.4X103 cmm 2) Here are three isotopes of an ele

a) 0.20 cm b) 1.7 cm c) 8 cm d) 6.4X103 cmm 2) Here are three isotopes of an element: 13C a. The element is: b. The number 6 refers to the c. The numbers 12, 13, and 14 refer to t…

a) 1 kg of steam contained in a horizontal frictionless piston and cylinder is h

a) 1 kg of steam contained in a horizontal frictionless piston and cylinder is heated at a constant pressure of 1.013 bar from 125 C to such a temperature that the volume doubles.…

a) 12% b) 133% c)75% d.) 100% How many moles of O are there i yo have 2.40 a.) 6

a) 12% b) 133% c)75% d.) 100% How many moles of O are there i yo have 2.40 a.) 6.02x10 b) 1.2 x 10 d.) 8 For the molecule AlHs what is the ouidation number for A a.) o b.) +1 C.) …

a) 40 (9) Use the Hess\'s law for the following processes: ak, =-802 kJ (i) CH4

a) 40 (9) Use the Hess's law for the following processes: ak, =-802 kJ (i) CH4 (g) + 202 (g) CO2 (g) + 2 H2O (g) (ii) H2O (g) H2O (l) CH4 (g) + 2O2 (g) CO2 (g) + 2 H2O (l) (iii) (…

a) 8.17 b)1.17 c) 5.83 d) 0.82 e) 5.01 2. The pH of a 0.15 M aqueous solution of

a) 8.17 b)1.17 c) 5.83 d) 0.82 e) 5.01 2. The pH of a 0.15 M aqueous solution of NaBrO (the sodium salt of HBrO) is 10.7. What is the Ka for HBrO? a. 1.3 × 10-12 b. 8.9 × 10-4 c. …

a) A + B -> 2C, delta H 1 2C ->A + B, delta H 2 = ? Delta H 2 =? b) A calorimete

a) A + B -> 2C, delta H1 2C ->A + B, delta H2= ? Delta H2=? b) A calorimeter contains 25.0 mL of water at 12.5 degrees C. When 2.30 g of X (a substance with a molar mass of …

a) A 0.250m3 tank contains 200mol of ammonia at 20C. Heat is added until tempera

a) A 0.250m3 tank contains 200mol of ammonia at 20C. Heat is added until temperature rises to 40C. Determine the amount of heat. b) One mol of ammonia at 8.6 bar, 100C, is cooled …

a) A 0.90 mu L sample of an equal volume mixture of 2-pentanone and 1-nitropropa

a) A 0.90 mu L sample of an equal volume mixture of 2-pentanone and 1-nitropropane is injected into a gas chromatograph. The densities of these compounds are 0.8124 g/mL for 2-pen…