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How does the Rf value of a given metal ion in solution by itself compare to its Rf value when it is in a mixture with other metals ions? Which is the more important interaction: the metal ion with the solvent system and paper or with the metal ions?
How much heat (in {rm kJ}) is evolved in converting 1.00 mol of steam at 140.0 C to ice at -55.C? The heat capacity of steam is 2.01J/g* C and of ice is 2.09 j/g* C.
A balloon containing 34.5 L of a gas at room temperature (25.0 oC) is heated to 73.5 oC. What is the volume of the balloon at this new temperature?
Determine How hot should be the air in a ballon be heated if it has initially a volume of 750. L at the temperature of 20 degree celsius and the final volume must be 1,000.l
Cobalt-60 is commonly used as a source of B-particles. How long does it take for 87.5% of a sample of cobalt-60 to decay, given that the half-life is 5.36 years?
To what volume must 518 mL of 13 M Ca(OH)2 solution be diluted to make a 3 M Ca(OH)2 solution?
Lead(II) sulfide reacts with hydrogen peroxide to form lead(II) sulfate and water. How many grams of hydrogen peroxide are needed to react completely with 265 g of lead(II) sulfide?
Compute the activation energy for this reaction when The half-lives were found to be 161 min at 199 Celsius and 12.5 min at 230 celsius? The isomerization of methyl isocynide follows first order kinetics.
Calculate the new volume of a 7.0Liter balloon if the pressure is reduced from 1.0 atmosphere to 0.80 atmosphere (assume the temperature remains constant)
A sunscreen preparation with a density of 2.82 g/mL contains 3.55% by mass zinc(II) oxide. Each tube is filled with 185.0 mL of sunscreen. If you are the manufacturer and use 5.00 lb of zinc(II) oxide.
A solution of ammonia and water contains 3.00×1025 water molecules and 5.10×1024 ammonia molecules. How many total hydrogen atoms are in this solution?
What is the effect of dissolved soap (soapy water v. plain water) on the pattern of diffusion of blue dye in water?
The mass of 322 mL of hydrogen gas at 4.0 atm and -73°C is 1.21 grams. What is the density of hydrogen gas at STP?
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