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Nickel (II) chloride dissolves in water to form a lightgreen solution. What species (ions) are present in solution i.e.,what is "swimming around" in the aqueous solution? writh the formulas.
Predict the initial rate if [NO]= 0.30 M and [H2]=0.15 M What would happen to the initial rate of the reacton if[NO]=0.60 M and [H2]=0.15 M instead. Does your result make sense interms of order of r
What is the hydroxide ion concentration of an aqueous 0.00370 M caffeine solution? The most basic nitrogen atom in caffeine has a Kbof 4.1x10-4
We completed a lab in which we titrated vinegar. We poured 50mL water into an Erlenmeyer flask to which we added 2 drops of phenolphthalein and 1 mL vinegar.
What are the freezing and boiling points of a solution that contains 10.0 grams of naphthalene, C10H8, dissolved in 50.0 grams of benzene?
Magnesium metal has a specific heat of 1.04. A 70g sample of Mg at a temp of 99.8 degrees C is added to a beaker containing 50.0g of water at 30.0 degrees C. What is the final temperature.
Assuming that a drop is 0.05 mL, how many drops of a 0.10 M KI solution must be added to 100 mL of 0.010 M Pb(NO3)2 to just get aprecipitate to form? (That is, how many drops of KI are required
Pure benzene has a normal freezing point of 5.50 degrees C. A solution containing 11.4 grams of a molecuar substance dissolved in 150.0 grams of benzene (kf = 5.12 degrees c/m) has a freezing point
What is the hydroxide ion concentration of an aqueous 0.00370Mcaffeine solution? The most basic nitrogen atom in caffeine has aKb of 4.1x10-4
0.300 moles of an unknown monobasic weak base are added 1.50L of water. The resulting solution has a pH 8.6. What is theKa of the conjugate acid of the unknown base? Assume no change in volume.
A reaction rate increases by a factor of 2470 in the presence of acatalyst at 32°C. The activation energy of the original, uncatalysed, pathway is 69kJ mol-1. What is the activation energy of th
Consider the structure of valinomycin, why can it transport ions across cell membranes and disrupt the ionis balance of the cell?
Why is a large steroid molecule such as oestrone able to cross the cell membrane and a smaller steroid molecule sich as adrenaline can not?
If a chemical reaction: A + B → C + D isendothermic, what is the sign of ΔH for the reaction? Would the temperature recorded in the calormeter well for such a reaction increase or decreas
What is the molarity of a KOH solution prepared by dissolving1.350g KOH in enough water to make a solution with a total volumeof 250.0 mL?
Vinegar is a dilute solution of acetic acid. A 15.64 mLsample of vinegar with a density of 1.06g/mL requires 24.80 mL of 0.469 N KOH for titration. What is the percent by mass of acetic acid in vine
Calculate the average H-S bond enthalpy in H2S(g) given that the standard enthalpies of formation of H2S(g), H(g) and S(g) are-20.1, 218.0, and 223.0 kJ/mol, respectively.
Calculate the entropy change for converting 1 mol of mercury vaporat 650 K to liquid mercury at 500K. The molar heat capacitiesof Hg(l) and Hg(g) are 28.0 and 21.0 J/K.mol, respectively.
One of the fastest super computers cab perform about 12 teraflpos. Determine how manyseconds it would take this computer to count a mole of things.
A helium filled water balloon is launched from the ground where the pressure is 752mmHg and temperature is 21c. Under these conditions it's volume is 75L.
The osmotic pressure of blood is 7.65 atm at 37 ?C. What mass ofglucose (C6H12O6, molar mass = 180.2 g/mol) is needed to prepare5.00 L of solution for intravenous injection?
Suppose that a particular moment during the reaction, molecularhydrogen is reacting at a rate of 0.044M/s. At what rate is ammonia being formed?
A yellow compound dissolved in methylene chloride is added toa chromatography column. The elution is begun using petroleum ether as the solvent.
What is the rate constant for the first order decay of acertain radioactive isotope if the concentration drops from 0.50Mto 0.050 M in 1.0 years?
A mixture of NaCl and sucrose (C12H22O11) of combined mass10.2g is dissolved in enough water to make up a 250ml solution. The osmotic pressure of the solution of the solution is 7.32 atm at250C. Cal