A 1.0 M solution of a compound with 2 ionizable groups (pKa's = 6.2 and 9.5; 100 mL total) has a pH of 6.8. What are the concentrations of the relevant acid and conjugate base?

Carboxylic Acids. Lipids are a macromolecule we need to survive and many of them happen to contain carboxylic acids. Choose one lipid - could be a particular steroid, fatty acid, or tri-glyceride and discuss its structure and potential reactivity. please cite on source using APA citation format.

QUESTION 1. Cool and condense benzene for storage (F&R 8.38)

At OzChem plant, benzene vapour is processed as a reagent. The plant produces benzene as a vapour (at 5780C, 1 atm), which is cooled and converted to a liquid at 250C in a continuous condenser that operates at 1 atm pressure (the pressure drop is negligible). The liquid condensate from the condenser is transferred at a rate of 150 mol/s into storage tanks. Calculate the rate (in kW) at which heat must be transferred from the benzene in the condenser.

A balloon contains 0.76 mol N2, 0.18 mol O2, 0.031 mol He and 0.026 mol H2 at 749 mm Hg. What is the partial pressure of O2?

Discuss the key differences between template synthesis vs template-free synthesis

The Lennard-Jones potential energy, U(x), is a function of "x" the distance between a pair of molecules. It is frequently called the van der Walls potential between molecules for dipole-dipole interactions. The potential is

U(x) = C12/ x^12 - C6/x^6             [1]

Here we assume for water molecules:

C12 = 9.5 x 104" J•m12

C6 = 1 x 10-76 J•m6.

(a) What is the separation distance (Xs) between two water molecules where the applied force (F) to pull the molecules apart is a maximum. Recall F = dU/dx.

(b) Calculate the maximum force (Fmax) required to separate two water molecules [overcome the cohesive force between the molecules].

(c) If oxygen has a mass of 16 g/mole and hydrogen has a mass of 1 g/mole, using Avodadro's number (6 x 10^23 molecules/mole) and the gravitational force of 9.8 m/s^2, calculate the force of attraction (due to weight) of one water molecule toward Earth.

(d) How does the gravitational force compare to van der Waals force of attraction of two water molecules?

Give the empirical formula of each of the following compounds if a sample contains the following quantities of each element. (Type your answer using the format CO2 for CO₂.)

(a) 0.0455 mol C, 0.039 mol H, and 0.013 mol O



(b) 6.44 g nitrogen and 3.67 g oxygen



(c) 69.9% iron and 30.1% oxygen by mass

Container A holds 732 mL of ideal gas at 2.30 atm. Container B holds 114 mL of ideal gas at 4.30 atm. If the gases are allowed to mix together, what is the resulting pressure?

1. Using a table of standard reduction potentials, standard conditions are assumed.

(a) Arrange the following chemical species: Zn(s), Cl^-(aq), Cu(s), K(s), and H₂(g) in order of their ease of oxidation, from easiest to oxidize to hardest to oxidize.

(b) Arrange the following chemical species: H⁺(aq), I₂(s), Na⁺(aq), Ag⁺(aq), and H₂O(l) in order of their ease of reduction, from easiest to reduce to hardest to reduce.

2. Which of the following reactions is/are product favored?

Zn(s) + I₂(s) ? Zn⁺² (aq) + 2I^-(aq)

2Cl^-(aq) + I₂(s) ? Cl₂(g) + 2I^-(aq)

2Na⁺(aq) + 2Cl^-(aq) ? 2Na(s) + Cl₂(g)

2K(s) + 2H₂O(l) ? 2K⁺(aq) + H₂(g) + 2OH^-(aq)

Match each chemical compound below with its corresponding dominant force.

Note: The best way to approach this problem is to use the chemical name to draw the formula, and then if necessary draw the corresponding Lewis structure.

sulfur difluoride

\hydrogen bonding            dispersion forces            dipole-dipole            ion-ion      

dihydrogen dioxide

hydrogen bonding            dispersion forces            dipole-dipole            ion-ion      

sulfur trioxide

hydrogen bonding            dispersion forces            dipole-dipole            ion-ion      

sodium chloride

hydrogen bonding            dispersion forces            dipole-dipole            ion-ion      

xenon tetrafluoride

hydrogen bonding            dispersion forces            dipole-dipole            ion-ion      

hydrogen fluoride

hydrogen bonding            dispersion forces            dipole-dipole            ion-ion      

ammonium iodide

hydrogen bonding            dispersion forces            dipole-dipole            ion-ion      

10) If a gas sample is heated, which change is expected?

a. Volume would increase.

b. Volume would decrease.

c. Volume is a fixed quantity; it cannot change.

d. The initial and final temperature does not affect volume.

11) If the pressure of a liquid was 600. mmHg, what is its pressure in torr?

12) In a gas, the particles

a. are close to each other.

b. are moving rapidly.

c. attract or repel.

d. All of these statements are true.

13) Suppose we take a 4.0 liter sample of a gas at 1.0 atm and increase the temperature from 22 C to100 C. What will the final pressure be if the volume does not change?

17) What is true about gases when the temperature increases?

a. The gas molecules collide with the walls of the container with more force.

b. The gas molecules move faster.

c. Gas particles hit the walls of the container more often.

d. All of these statements are true.

18) Which statement is incorrect when considering gases?

a. Gas molecules are not in motion at room temperature.

b. The pressure of a gas increases when the gas particles collide with the walls of the

chamber with more force.

c. A reason why molecules of a gas fill a container is that there is no attraction between the

molecules of the gas.

d. Statements 1 and 2 are both false.

19) Which statement is true?

a. When pressure increases, volume increases.

b. When temperature increases, volume increases.

c. When temperature increases, pressure decreases.

d. When the number of moles of gas increases, the pressure decreases.

20) What mass of neon has a volume of 56.0 L at STP?

The formation constant* of [M(CN)4]2– is 7.70 × 1016, where M is a generic metal. A 0.140-mole quantity of M(NO3)2 is added to a liter of 0.890 M NaCN solution. What is the concentration of M +2 ions at equilibrium?

Read the following case study:

Swan is a 14-year-old student at the Sea-Cow School for the Performing Arts. Her goal in life is to be a world-acclaimed ballet dancer. She has been dancing ever since she was 4 years old, when her parents enrolled her in a Ballet for Tots program. Swan’s parents have always encouraged her to pursue her dream of dancing professionally. As a young girl, Swan had the perfect body for a ballet dancer, slim and flexible. Within the last year, Swan has become concerned that she is gaining weight. She heard from friends that smoking cigarettes could help her stay thin, although she didn’t exactly know why. Swan became desperate to control her weight and started borrowing cigarettes from friends. Eventually, she was smoking almost a pack of cigarettes a day and felt edgy and irritable if she went without smoking for more than a few hours. She thought about trying diet pills or even barbiturates to avoid the smell of the cigarette smoke.

Swan’s parents have approached you, the school counselor, because they found rolling papers in her room. Although Swan denies using any other drugs, her parents are convinced that she has been smoking marijuana. 1.) How would you approach this as case as a school counselor? 2.) Do you think Swan is at risk for addiction? 3.)What questions would you ask Swan and/or her parents? 4.)What recommendations would you make?

Write four paragraphs (at least a page) talking about LEAD.

a. Define LEAD, the means of transportation and transformation of LEAD, the sources of LEAD and the effects it has on human beings and the enviroment.