1)Which of the following would be expected to be the most soluble in water?

butanol
proanol
propane

2) Liquid hexanol (C₆H₁₃OH) has a normal boiling point of 158 °C and liquid decanol (C₁₀H₂₁OH) has a normal boiling point of 233 °C

(a) In which of the two are the intermolecular forces the strongest?

(b) Which of the two would you expect to have the lowest surface tension at 25 °C?

Consider the titration of 70 ml of 0.25 M hydrazine, N₂H₄ titrated with 0.35 M HBr. ( K_b= 1.3 x 10^-6).

A. Write the reaction equation for above reaction.

B. Calculate the volume of HBr required to reach the end point.

C. Caculate the pH before addition of any acid.

D. Calculate pH after addition of 20 mL of HBrI.

E. Caculate pH after addition of 25 mL of HBr.

F. Caculate pH at the end point.

G. Calculate pH after addition of 59 mL of HBr.

Draw a simple molecular orbital diagram for the following molecules. O₂².... N₂^+.... C₂2- '''a. Is the ion paramagnetic or diamagnetic? b. What is the bond order in the ion? c. Would these ions have longer, shorter, or the same bond length as their neutral counterpart? d. Would these ions have stronger, weaker, or equal bonding strength as their neutral counterparts

Draw a simple molecular orbital diagram for the following molecules. O₂².... N₂^+.... C₂2- '''a. Is the ion paramagnetic or diamagnetic? b. What is the bond order in the ion? c. Would these ions have longer, shorter, or the same bond length as their neutral counterpart? d. Would these ions have stronger, weaker, or equal bonding strength as their neutral counterparts

Draw a simple molecular orbital diagram for the following molecules. O₂².... N₂^+.... C₂2- '''a. Is the ion paramagnetic or diamagnetic? b. What is the bond order in the ion? c. Would these ions have longer, shorter, or the same bond length as their neutral counterpart? d. Would these ions have stronger, weaker, or equal bonding strength as their neutral counterparts

Answer the following and explain your reasoning briefly. a.Increasing temperature changes the activation energy.True or false? b.For a reaction that has the rate lab, rate=k[A]2[B], doubling the concentration of A has what affect on the reaction rate? c.For a reaction with a large negative ΔG (product favored and spontaneous), the rate will [choose one: always, sometimes, never] be fast.

Ni-en complex
If I desire to make these products, and I start with 5 mL of [Ni(H2O)6] 2+ in each case, what is the amount of (en) ligand that should be added to create each of these complexes?

[Ni(H₂O)₄(en)]²⁺

[Ni(H₂O)₂(en)₂]²⁺ :

[Ni(en)₃]²⁺

Calculate the pH for each of the following cases in the titration of 50.0 mL of 0.140M HClO(aq) with 0.140M KOH(aq). The ionization constant for HClO is 4.0*10^-8 which was obtained from this site a) before addition of any KOH? b)after addition of 25.0 mL of KOH? c)after addition of 35.0 mL of KOH? d)after addition of 50.0 mL of KOH? e)after addition of 60.0 mL of KOH ?

Consider a one acre field with a 100 ft high layer of air exactly over the field. Water vapor condenses and forms a 0.1 mm layer of dew on the surface of the field. If the air temperature was 60 oF when the dew forms, what is the final temperature of this layer of air (in oF)?

Assumptions and Values:

• Let the surface of the field be perfectly flat.

• Let the air absorb all heat from the formation of the dew.

• Let the heat of vaporization of water be ∆Hvap = 44 kJ mol

• Let the density of the air be ρair = 1.2 kg m3 • Let the specific heat of the air be Cair = 1.01 J g · oC

1. The observation that the absorbance is linearly proportional to the concentration of dye is a statement of which law?

2. For this question, note that you diluted your prepared drink mix 1:10 before you obtained absorbance values, and therefore your calculated concentration of each dye is 1/10 that of the prepared drink mix. You calculated that the concentration of yellow food dye in the cuvette is 0.0141 mM.  Given that the molecular weight of the yellow 5 dye is equal to 534.36 g/mol. How many grams of yellow 5 food dye were in the 0.235 L solution of drink mix? (Remember that molarity = moles / L and that molecular weight = mass / moles). Choose the closest answer.

3. Given that the mass of the red dye in 0.5 g of prepared drink mix is equal to 0.00089 g, what percent mass does this represent? (Percent mass = (mass of dye / mass of powder ) * 100%)  

4. Given that the mass of the yellow dye in 0.5 g of prepared drink mix is equal to 0.0018 g, what percent mass does this represent? (Percent mass = (mass of dye / mass of powder ) * 100%)

5.The concentration of red food dye in the prepared drink mix can be calculated from Beer's law (absorbance = path length (1 cm) * extinction coefficient * concentration). Using the extinction coefficient for the red dye calculated in experiment 2 and the absorbance of the drink mix at 500 nm, calculate the concentration of red food dye. Choose the closest answer.

6.For this question, note that you diluted your prepared drink mix 1:10 before you obtained absorbance values, and therefore your calculated concentration of each dye is 1/10 that of the prepared drink mix. You calculated that the concentration of the red food dye in the cuvette is 0.0089 mM. Given that the molecular weight of the red 40 dye is equal to 496.42 g/mol. How many grams of red 40 food dye were in the 0.235 L solution of drink mix? (Remember that molarity = moles / L and that molecular weight = mass / moles). Choose the closest answer.

7.The concentration of yellow food dye in the prepared drink mix can be calculated from Beer's law (absorbance = path length (1 cm) * extinction coefficient * concentration). Using the extinction coefficient for the yellow dye calculated in experiment 2 and the absorbance of the drink mix at 420 nm, calculate the concentration of yellow food dye. Choose the closest answer.

8.The equation for a straight line representing the absorbance of the red dye at the peak absorbance wavelength as a function of the concentration of the red dye is y = 27320x +0. The slope of the line gives the extinction coefficient. What is the molar extinction coefficient for the red dye?

Calculate the pH at the equivalence point in titrating 0.071 M solutions of each of the following with 0.028 M NaOH.

(a) hydroiodic acid (HI) pH =___

(b) hypochlorous acid (HClO), Ka = 3e-08 pH =____

(c) hydrosulfuric acid (H2S), Ka = 9.5e-08 pH =____

Aqueous sulfuric acid H2SO4 will react with solid sodium hydroxide NaOH to produce aqueous sodium sulfate Na2SO4 and liquid water H2O . Suppose 92. g of sulfuric acid is mixed with 39.9 g of sodium hydroxide. Calculate the maximum mass of sodium sulfate that could be produced by the chemical reaction. Be sure your answer has the correct number of significant digits.

a mixture of 50%He and 50% n2 (by volume) at 300k in a 1L cylinder is compressed in until the volume is reduced by a factor of 4. the final temperature is 500k. find entropy generated

A yellow substance was found to contain 54.5% Carbon, 9.10% Hydrogen and 34.6% Oxygen by mass. What is the molecular and empirical formula for the compound if it has a molar mass of approximately 135g/mole?

A coal particle burns in air at 1145 K and atmospheric pressure. The process is limited by diffusion of the oxygen counterflow to the CO₂ and CO that are formed at the particle surface. Twice as much CO is formed as CO₂. Assume that the coal is pure carbon with a density of 1280 kg/m³ and that the particle is spherical with an initial diameter of 0.015 cm. Under the conditions of the combustion process, the diffusivity of oxygen in the gas mixture may be assumed to be 10^-4 m²/s. If the combustion is instantaneous:

Find an algebraic equation for the combustion rate of oxygen, W_A. State all assumption and boundary conditions.

Determine the time that is necessary to reduce the diameter to 0.005 cm.

mass transfer course