Chemistry concepts and calculations

1. A current issue in the Colorado River Basin is A. the cost of diversion of wa

1. A current issue in the Colorado River Basin is A. the cost of diversion of water for irrigation purposes has become prohibitive. Secondary sewage treatment 5 Secondary Primary …

1. A cylinder contains 28.0 L of oxygen gas at a pressure of 1.6 atm and a tenpr

1. A cylinder contains 28.0 L of oxygen gas at a pressure of 1.6 atm and a tenprerature of 288 K. How many moles of gas are in the cylinder? 2. A mixture of helium, nitrogen and o…

1. A cylinder with piston contains 1.00 kg of water at 100°C and 1.00 atm. Half

1. A cylinder with piston contains 1.00 kg of water at 100°C and 1.00 atm. Half of the water is in the liquid state and half in the vapor state. The combined volumes of the two ph…

1. A denaturing agent is a substance that disrupts the three dimensional structu

1. A denaturing agent is a substance that disrupts the three dimensional structure of large molecules such as proteins, DNA, or RNA and leads to their denaturation. The conjugate …

1. A diprotic acid is being titrated with a strong base. A volume of 0.0500 L of

1. A diprotic acid is being titrated with a strong base. A volume of 0.0500 L of 0.0750 M diprotic acid (H2A+) is combined with 0.0150 L of 0.250 M NaOH.   Ka1 for the diprotic ac…

1. A dramatic classroom demonstration involves cooling a balloon from room tempe

1. A dramatic classroom demonstration involves cooling a balloon from room temperature (299 K ) to liquid nitrogen temperature (77 K). Part A If the initial volume of the balloon …

1. A drug is injected in to a region of muscle that has a volume of 0.33 liters.

1. A drug is injected in to a region of muscle that has a volume of 0.33 liters. The muscle is well supplies with blood and the drug is removed from the muscle at a rate that is p…

1. A duck with a mass of 4 kg experiences a drag force of 35 N while flying at 2

1. A duck with a mass of 4 kg experiences a drag force of 35 N while flying at 20 m/s. How much work must the duck do in order to fly 100 km at constant speed? For reference 1 foo…

1. A field geologist carries a dropper bottle of a strong acid, HCI(aq), to help

1. A field geologist carries a dropper bottle of a strong acid, HCI(aq), to help with the identification of samples. A rock is found to give off odorless gas bubbles when a few dr…

1. A first order reaction is seen to go from a reactant concentration of 0.0451

1. A first order reaction is seen to go from a reactant concentration of 0.0451 M to 0.0321 M in 41.8 seconds? How long (in seconds) after the reaction starts will the reactant co…

1. A first order reaction takes 14.3 minutes to be 50.0% complete. How long will

1. A first order reaction takes 14.3 minutes to be 50.0% complete. How long will the reaction take in minutes to be 90.5% complete? Calculate the rate constant for the reaction? 2…

1. A first-order decomposition reaction has a rate constant of 0.0056 yr^-1. How

1. A first-order decomposition reaction has a rate constant of 0.0056 yr^-1. How long does it take for [reactant] to reach 12.5% of its original value? Be sure to report your answ…

1. A fixed amount of gas at 20 degrees Celsius occupies a volume of12.0L under p

1. A fixed amount of gas at 20 degrees Celsius occupies a volume of12.0L under pressure of 650 torr. Calculate its volume at the samepressure when the temperature is increased to …

1. A flask contains 10.0 mL of HCl and a few drops of phenolphthalein indicator.

1. A flask contains 10.0 mL of HCl and a few drops of phenolphthalein indicator. A buret contains 0.190 M NaOH. A) What volume of NaOH is needed to reach the end point of the titr…

1. A friend is interested installing a wireless LAN in her small business. She h

1. A friend is interested installing a wireless LAN in her small business. She has approximately 15 employees who primarily use office automation applications with printed require…

1. A friend is interested installing a wireless LAN in her small business. She h

1. A friend is interested installing a wireless LAN in her small business. She has approximately 15 employees who primarily use office automation applications with printed require…

1. A fuel gas consisting of 94 mole% methane and 6 mole% nitrogen is burned with

1. A fuel gas consisting of 94 mole% methane and 6 mole% nitrogen is burned with 30% excess air in a continuous water heater. Both fuel gas and air enter dry at 298.15 K(25 oC). W…

1. A fuel gas consists of 75% butane (C 4 H 10 ), 10% propane (C 3 H 8 ) and 15%

1. A fuel gas consists of 75% butane (C4H10), 10% propane (C3H8) and 15% butene (C4H8) by volume. It is to be fed to the combustion chamber in 10% excess air at 25ºC, where it is …

1. A fuel has the formula C 9 H 16 and its combustion is complete (i.e. it combi

1. A fuel has the formula C9H16 and its combustion is complete (i.e. it combines entirely with oxygen to produce CO2 and water). Write down the balanced chemical equation of the c…

1. A function type is defined by the 2. An argument passed to a function can 3.

1. A function type is defined by the 2. An argument passed to a function can 3. If a function does not expect an argument, the function's prototype can be declared 4. To make the …

1. A gas has a volume of 2.90 L, a pressure of 1.33 atm, and a temperature of 24

1. A gas has a volume of 2.90 L, a pressure of 1.33 atm, and a temperature of 24.5 °C. Calculate the number of moles of gas present. ______ mol gas 2. A certain flexible weather b…

1. A gas is___ and assumes of its container whereas a liquid is--, and assumes o

1. A gas is___ and assumes of its container whereas a liquid is--, and assumes of its container a compressible, the volume and shape, not compressible, the shape of a portion b. c…

1. A gas was compressed unde conditions. The original gas pressure r constant te

1. A gas was compressed unde conditions. The original gas pressure r constant temperature was 742 mmHg and the expansion was accomplished by changing the volume from 6.50 L to 4.0…

1. A gaseous hydrocarbon collected over water at a temperature of 21 degree C an

1. A gaseous hydrocarbon collected over water at a temperature of 21 degree C and barometric pressure of 753 torr occupied a volume of 48.1 mL. the hydrocarbon in this volume weig…

1. A graduate student is studying bromobenzene, and decides to take an El mass s

1. A graduate student is studying bromobenzene, and decides to take an El mass spectrum of it. A research scientist suggests that he take the mass spectra at 50 eV, 70 eV and 120 …

1. A has broad and moderately steep flanks and a steep summit. It results from t

1. A has broad and moderately steep flanks and a steep summit. It results from the eruption of a mixture of both lava flows and pyroclastic deposits that contain less fluid materi…

1. A highway has an optional toll lane that drivers may take to reduce the time

1. A highway has an optional toll lane that drivers may take to reduce the time they spend driving. Drivers pay a small fee to enter the toll lane ($0.25). Then, once they leave t…

1. A homologous series of primary alcohols is to be determined by GC. Given that

1. A homologous series of primary alcohols is to be determined by GC. Given that the retention time for ethanol is 1 min, predict the retention times for 1-propanol, 1-butanol, an…

1. A hot solution of a particular compound was allowed to cool to room temperatu

1. A hot solution of a particular compound was allowed to cool to room temperature. After waiting a few minutes, it was noticed that the crystallization had not taken place. Discu…

1. A hot tub with a surface area of 25 ft^2 is filled with water to a deph of 28

1. A hot tub with a surface area of 25 ft^2 is filled with water to a deph of 28 inches. a. what is the volume, in liters, of the water in the hot tub? b. what is the mass, in kil…

1. A human body is: A) a closed system B) an adiabatic system C) an open system

1. A human body is: A) a closed system B) an adiabatic system C) an open system 2. Temperature is: A) a state variable B) none of the above C) a state function 3. Pressure is: A) …

1. A hydrocarbon with six carbon atoms exhibits a proton NMR spectrum with sever

1. A hydrocarbon with six carbon atoms exhibits a proton NMR spectrum with several peaks in the 1.0 - 2.0 ppm chemical shift range in addition to several peaks in the 6.0 ppm chem…

1. A hydrohen atom near an oxygen atom would be [shielded or deshielded] and its

1. A hydrohen atom near an oxygen atom would be [shielded or deshielded] and its signal would be moved [upfiel or downfield]. 2. Aldehyde hydrogens usually show a signal at approx…

1. A key step in the extraction of iron metal from iron ore is: FeO(s) + C0 (g)

1. A key step in the extraction of iron metal from iron ore is: FeO(s) + C0 (g) re(s) + C02 (g) Kp-0.403 at 1000°C What are the equilibrium partial pressures of CO, and CO2(p when…

1. A lab assistant organizing a cabinet used to store general reagents used in l

1. A lab assistant organizing a cabinet used to store general reagents used in laboratory spot tests, discovered six unlabeled bottles containing two clear liquids, three containi…

1. A lab tech adds 0.20 mol of NaF to 1.00 mL OF 0.35 M cadmium nitrate, Cd(NO3)

1. A lab tech adds 0.20 mol of NaF to 1.00 mL OF 0.35 M cadmium nitrate, Cd(NO3)2. Which of the following statements is correct? Ksp=6.44x10^-3 for CdF2. a. Cadmium fluroide preci…

1. A labile ion undergoes rapid ligand exchange. a. True b. False 2. A trans iso

1. A labile ion undergoes rapid ligand exchange. a. True b. False 2. A trans isomer has identical ligands opposite to each other. a. True b. False 3. How many unique isomers are p…

1. A labile ion undergoes rapid ligand exchange. a. True b. False 2. A trans iso

1. A labile ion undergoes rapid ligand exchange. a. True b. False 2. A trans isomer has identical ligands opposite to each other. a. True b. False 3. How many unique isomers are p…

1. A labile ion undergoes rapid ligand exchange. a. True b. False 2. A trans iso

1. A labile ion undergoes rapid ligand exchange. a. True b. False 2. A trans isomer has identical ligands opposite to each other. a. True b. False 3. How many unique isomers are p…

1. A large quantity of chemical energy is stored in a gummy bear, which is prima

1. A large quantity of chemical energy is stored in a gummy bear, which is primarily sugar, C12H22O11. When a gummy bear is placed in molten KClO3, the sugar is oxidized according…

1. A light bulb contains a mixture of argon and kryton gases at a total pressure

1. A light bulb contains a mixture of argon and kryton gases at a total pressure of 615 mmHg. If the pressure of argon is 443 mm Hg, the pressure of krypton gas must be ---? a. 10…

1. A list is a collection that __________. a. associates keys with elements b. a

1. A list is a collection that __________. a. associates keys with elements b. assigns an index to each of its elements c. is implemented by the JList class d. none of the above 2…

1. A main group element with the valence electron configuration 3s 1 is in perio

1. A main group element with the valence electron configuration 3s1 is in periodic group ____ It forms a monatomic ion with a charge of _____ 2. If an element with the valence con…

1. A male patient, age 24, is admitted to the ER after an acute barbiturate over

1. A male patient, age 24, is admitted to the ER after an acute barbiturate overdose. Results from an arterial blood gas are as follows. Evaluate the information to determine resp…

1. A mass hung on a string that is wrapped around an axle on a wheel produces a

1. A mass hung on a string that is wrapped around an axle on a wheel produces a tension in the string of 6.00 N. The axle has a radius of 0.050 m. The wheel has a mass of 4.00 kg,…

1. A mass of 0.1212 g of an unknown acid is dissolved in a total volume of 25.00

1. A mass of 0.1212 g of an unknown acid is dissolved in a total volume of 25.00 mL. The 25 mL sample is titrated with 0.050 M NaOH. The titration data is shown in the Table . a.U…

1. A mass on a long hanging spring oscillates vertically with no damping Choose

1. A mass on a long hanging spring oscillates vertically with no damping Choose the equilibrium position to be y 0 and up to be the positive time t = 0, the velocity is 3.0 m/s do…

1. A metal sample weighing 124.10 g and at a temperature of 99.3°C was placed in

1. A metal sample weighing 124.10 g and at a temperature of 99.3°C was placed in 42.87 g of water in a calorimeter at 23.9°C. At equilibrium the temperature of the water and metal…

1. A metal sample, at 20. degree Celsius, has a heat capacity of 0.25 J/C. How m

1. A metal sample, at 20. degree Celsius, has a heat capacity of 0.25 J/C. How much heat it must absorb to increase its temperature to 53 degree Celsius? 2. In a coffee-cup calori…

1. A metal that weighs 5.75g is 50.0degrees Celsius. When placed into calorimete

1.     A metal that weighs 5.75g is 50.0degrees Celsius. When placed into calorimeter with 25.00mL of waterat 23.0 degrees Celsius the temperature of rose to 27.0 degreesCelsius. …