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A certain dry mixture contains only three compounds- silver nitrate, magnesium chloride, and barium nitrate. When 1.253 g of the mixture was added to excess water, 0.114 g of dry precipitate was rec
What happens to the pressure inside a closed container if the number of moles inside the container is increased while the temperature is maintained constant?
Bromothymol blue, ka = 1.6 x 10^-7, is yellow in its protonated form (HX) and blue in its ionized form (X-). At what PH will bromothymol blue be a perfect green color?
Why is it an important concept that atoms generally appear in whole number molar ratios to each other in chemical compounds, and in general, would you expect that students would find this ratio to b
Why is it an important concept that atoms generally appear in whole number molar ratios to each other in chemical compounds? What does this tell us about the nature of matter?
How does the experimental empirical formula of hydrated alum compare to the actual empirical formula? Make sure to list your reference for the actual empirical formula of hydrated alum.
What is the rate constant of a first-order reaction that takes 367 seconds for the reactant concentration to drop to half of its initial value?
A student added calcium ion, ca2+ to an aqueous solution and observed formation of a precipitate. Addition of HNO3 had no effect on the precipitate. What anion wa present in the original solution?
A system of propane and n-butane exists in two phase vapor / liquid equilibrium at 10 bar and 323 K. The mole fraction of propane in the vapor phase is 0.67 and 0.40 in the liquid phase.
What is the longest wavelength of light that can be emitted by a hydrogen atom that has an initial configuration of 7p1? Give your answer accurate to three significant figures.
If the electron in a hydrogen atom undergoes a transition from an n = 6 level to an n = 4 level, what is the wavelength of the radiation emitted? Give your answer accurate to three significant figur
What is the maximum kinetic energy of an ejected electron if platinum metal is irradiated with 174-nm light? The threshold wavelength for a platinum metal surface is 212 nm.
Caffeine (C8H10N4O2) is a stimulant found in coffee and tea. If a solution of caffeine in chloroform (CHCl3) as a solvent has a concentration of 0.0900 m, calculate the the percent caffeine by mass
A certain substance, intially present at 0.500 M, decomposes by second-order kinetics with a rate constant of 4.00 x 10-1 L/mol min. Calculate the time (in minutes) required for the system to reach
Oxalic acid (H2C2O4) is a useful primary standard for standardizing solutions such as potassium permanganate (KMnO4). In a particular standardization experiment 29.00g of oxalic acid, is titrated wi
A solution of household bleach contains 5.25% sodium hypochlorite, NaOCl, by mass. Assuming that the density of bleach is the same as water, calculate the volume of household bleach that should be d
Classify these oxides as acidic, basic, amphoteric, or neutral. P4O10, At2O7, Al2O3, SnO2, MgO, Li2O, CO, NO. Begin by classifying the element (other than oxygen) in each oxide by where it appears o
A 0.50 mol sample of oxygen gas is confined a 0° C in a cylinder. The initial pressure in the cylinder is 1.0 atm. If the gas is compressed by a piston so that the final volume is 57.3% of the i
A sample conaining both HCl and HNO3 had a density of 1.083g/ml. A 30.00 ml amount of this sample required 25.78 ml of 0.3248 M NaOH for titration. Another 30.00 ml amount of this sample required 24
A gaseous system undergoes a change in temperature and volume. What is the entropy change for a particle in this system if the final number of microstates is 0.680 times that of the initial number o
What is the pH of a solution created by mixing 368.0 mL of 0.175 M Hydrochloric Acid, HCl, with 231.0 mL of 0.318 M Sodium Hydroxide, NaOH?
For a Voltaic Cell involving Pb as the anode and Ag as the cathode, what would be the initial voltage of the cell if the initial concentration of Pb2+ was 0.5M and Ag+ was 0.1M
The solubility of CO2 in water at 25°C and 1 atm is 0.034 mol/L. What is its solubility under atmospheric conditions? (The partial pressure of CO2 in air is 0.00055 atm.) Assume that CO2 obeys
What would be the effect on your calculated mass percent recovery of Cu if you did not completely react the Mg in the reaction mixture? Briefly explain.
An element has 3 stable isotopes with natural abundances of 11%, 17%, and 72%. The masses of those isotopes are 19.9, 21.9, and 22.9 amu respectively. What is the average atomic mass of this elemen