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An open flask sitting in a lab fridge looks empty, but we know that actually it is filled with a mixture of gases called air. If the flask volume is 1.50 L, and the air is at standard temperature an
Calculate the potential of a hydrogen ( p= 1.02 atm) electrode in an aqueous solution of HBr (0.05 m ) at 298 K A) assuming ideal solute behavior. B) using the Deby- Huckel equation.
The term solution is synonymous with which of the following. A. compound B. element C. homogeneous mixture D. heterogeneous mixture
Which of the following has the substances arranged from lowest boiling point to highest A. NaCl, C2H6, C4H10, H2O B. NaCl, H2O, C2H6, C4H10 C. C2H6, C4H10, H2O, NaCl D. C2H6, C4H10, NaCl, H2O
A student placed 18.5g of glucose (C6H12O6) in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100
If 15 g of sugar are dissolved in 200 g of water, which of the following terms describes the sugar? A. solvent B. solute C. suspension D. colloid
What happens to the temperature of a liquid as evaporation occurs. A. The temperature of the liquid increases. B. The temperature of the liquid remains the same. C. The temperature of the liquid dec
Which of the following accurately describes the change that occurs when liquid water is frozen into an ice cube. A. A physical change B. A chemical change C. Both a physical and chemical change D. N
A liquid boils when its heat of vaporization is the same as its temperature. D. A liquid boils when its evaporation rate becomes constant.
What is the equilibrium constant, K, value (ignore units) at 441.3 K for the following reaction ? N2(g) + 3 H2(g) ? 2 NH3(g) [Note (all at 25oC): (1) Standard enthalpies of formation for N2, H2, and
Determine the pH at the equivalence (stoichiometric) point in the titration of 30.9 mL of 0.804 M HCOOH by 0.369 M LiOH. The Ka of HCOOH is 1.8 x 10-4.
What is the volume in mL of 0.466 M HCl(aq) needed to reach halfway to the equivalence (stoichiometric) point in the titration of 49.6 mL of 0.789 M trimethylamine (Kb = 6.5 x 10-5).
Which of the following rtansitions in a hydrogen atom would emit radiation having the highest energy. A) n=1 to n=2 B) n=2 to n=6 C) n=6 to n=4 D) n=4 to n=1 E) n=3 to n=2 Please explain the answer
Calculate the pH during the titration of 24.8 mL of 0.736 M HBr(aq) with 0.185 M KOH(aq) after 14.1 mL of the base have been added
Indicate the approximate location (cm-1) in the IR Spectrum where you would expect to see one or two absorptions that distinguish n-butyl, sec-butyl, and isobutyl from each other.
What mass (in g) of iron is needed to evolve 730.5 kJ of heat under standard conditions as it forms iron(III) oxide
What is the sum of the stoichiometric coefficients the formation reaction for methanol (CH3OH). Enter any fraction as a decimal.
The reaction described in Part A required 3.50L of calcium chloride. What is the concentration of this calcium chloride solution
How much heat (in kJ) is needed when 58.9 g of water warms and boils from 47.91 degrees C to 100 degrees C
What mass of silver chloride can be produced from 1.27L of a 0.298M solution of silver nitrate
What is the [H3O+] of a buffer that consists of 0.154 M CH3CH2COONa and 0.645 M CH3CH2COOH. Ka of propanoic acid, CH3CH2COOH is 1.3 x 10-5.
In a second-order reaction the rate constant is 4.00 × 10?4 M?1 s?1. What is the concentration of reactant after 10 min if the initial concentration is 0.800 M
On being heated with potassium ethoxide in ethanol (70 degrees C), the deuterium-labeled alkyl bromide shown gave a mixture of 1-butene, cis-2-butene, and trans-2-butene. On the basis of your knowle
What is the final concentration (in M) of 15.4 mL iron(III) chloride solution with an initial concentration of 1.94 M which is diluted with 19.5 mL of solvent
Calculate the pH of a solution that results from mixing 19.5 mL of 0.145 M HCN(aq) with 22.1 mL of 0.108 M NaCN. The Ka value for HCN is 4.9 x 10-10.