Start Discovering Solved Questions and Your Course Assignments
TextBooks Included
Active Tutors
Asked Questions
Answered Questions
If you were to remove 30 spheres from the jar containing the mixture (assume you get a representative distribution of colors), what would be the total mass of spheres left in the jar?
If the densities of 20%, 50% and 70% solutions are 0.69 and 0.58 and 0.49 g/mL, respectively, and the denisty of the unknown solution is 0.50 g/mL, what is the approximate concentration of the unkno
On a recent trip out of the country a chemistry professor found a golden-colored metal coin at a flee market. The person selling the coin priced it at $200, claiming it was pure gold.
If the sun is a distance of 1.5 x 108 km from Earth, how many minutes does it take sunlight to reach earth if light travels at 186,000 miles each second?
Describe a common buffer system and elution method in ion exchange chromatography. What are the salt ions in the elution buffer good for?
How much heat would be given off per mole of NaOH if 4.6g of NaOH dissolves to give off 755J of heat? How many grams of NaOH are needed to produce 88 kJ of heat? Please explain the steps to get the
The native conformation of a protein represents the lowest energy state of the polypeptide. Would you expect it to be always true? Explain.
How many grams of nitrogen monoxide are produced when copper metal reacts with nitric acid to form water and 5.92 g of copper(II) nitrate in addition to the nitrogen monoxide?
For analysis, a short peptide seven residues long is treated with FDNB, followed by complete acid hydrolysis and amino acid chromatography. What are the products of these steps?
Describe the use of light absorbing reagents in amino acid chromatography.What are these reagents used for?Name two reagents that are commonly used and describe how they react with amino acids.
What is the strongest base that may exist in water? What happens to stronger bases? (Use methoxide, CH3O1-, as an example.)
What is the new pH of the solution after 6.50g solid sodium hydroxide is added to 1.00L of the solution and dissolved. (Assume there is no appreciable volume change with the addition of the solid.)
The heat of vaporization of water is 40.66 kJ/mol. Assuming sweat is 100% water, how much heat is removed from your body through the evaporation of 1.86 g of sweat?
How does the average mass for a sphere in this sample compare with the average mass of the sample that consisted just of the blue spheres? How can such different samples have their averages turn out
Phenol is a common organic compound that may be used as a disinfectant. Its pKa in water is 10.0 while in methanol its pKa = 14.4. Is it a stronger acid in water or methanol? Explain the difference
You take a 25.00 g ice cube (temperature -20 EC) and place it in 225.00 g of water at 22 EC. What will the temperature of the water be when the ice cube has just melted. Assume the specific heat cap
Consider the combustion of ethylene, C2H4 (g) + 3 O2 (g) ------> 2 CO2 (g) + 2 H2O (g). If the concentration of C2H4 is decreasing at the rate of 0.025 M/s, what are the rates of change in the co
What is the theoretical yield of hydrogen gas when 12.5g of sodium metal reacts with an excess of water, while also producing sodium hydroxide? (need balanced equation). What is the limiting reactan
What is the molarity of a sodium carbonate solution if it requires 35.2 mL of this solution to completely react with 17.4 mL of 0.985M copper(II) nitrate solution? (balanced equation)
How much heat would be given off per mole of NaOH if 4.6g of NaOH dissolves to give off 755J of heat? How many grams of NaOH are needed to produce 88 kJ of heat?
A 0.204 g sample of a CO3^2- antacid is dissolved with 25.0 mL of a 0.0981 M HCl. The hydrochloric acid that is not neutralized by the antacid is titrated to a bromophenol blue endpoint with 5.83mL
The electron affinity of nitrogen is a +7 while those for carbon and oxygen are !122 and !141 kJ/mole, respectively. Why is it even reasonable to suggest nitrogen having a positive electron affinity
You are on the Starship Enterprise and the person in charged of preparing the weapons that are being used in a battle with the Klingons.
You take stoichiometric amounts of 2-heptene, C7H14, and oxygen in a sealed 1.500 L flask and allow them to react. The reaction goes to completion. The pressure in the flask after the reaction is me