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Which of the following represents a physical change in matter?
Select one:
a. A substance solidifies at 75°Cb. A substance produces a gas when heatedc. A substance burns when heatedd. A substance changes color when exposed to air.
Explain (using chemical equations) why NaOCl (bleach) is not terribly effective at killing bacteria in pools or tubs where the water has become acidic over time.
50.00 mL of 0.10 M HNO2 (nitrous acid, Ka = 4.5 ´ 10-4) is titrated with a 0.10 M KOH solution. After 25.00 mL of the KOH solution is added, the pH in the titration flask will be
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
What is the solubility in mg per ml of BaF_2_ a. in pure water b. in water containing 5.0mg/ml KF?
Write net Bronsted equations and determine the equilibrium constants for the acid-base reactions that occur when aqueous solutions of the following are mixed.
Gallium consists of two isotopes of masses 68.95 amu and 70.95 amu with abundances of 60.16% and 39.84%.
A sample consisting of various gases contains 3.4 10-6 mole fraction of radon. This gas at a total pressure of 33 atm is shaken with water at 30°C. Calculate the molar concentration of radon in the water.
Calculate the mass of the solvent (CCl4) in kg. Use the molality calculated in question 2 and the solvent mass calculated in question 3 to determine the number of moles of solute present in this solution.
Suppose you take a 25.00 mL sample of this hydrochloric acid solution. You then titrate it with a 0.1477 M sodium hydroxide solution.
Titanium () chloride, a substance used in catalysts for preparing polyethylene, is made by high-temperature reaction of vapor with :2TiCkl4+H2 yielding 2TiCl3+2HCl. How many grams of are needed for complete reaction with 150 of at 450 and 785 pres..
Calculate Kc for the reaction 2CCl4(g) + O2(g) [3] 1.75 moles of H2O2 were placed in a 2.50 L reaction chamber at 307C. After equilibrium was reached, 1.20.
How can I make up 100ml of a solution containing Compound A (solid, purity of 83.7%) at 90 ug/ml and compound B (liquid, density 1.12 and purity of 90.5) at 30 ug/mL for HPLC reference standard.
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