You have 875 mL of an 0.39 M acetic acid solution. What volume (V) of 1.70 M NaOH solution must you add in order to prepare an acetate buffer of pH = 4.36? (The pKa of acetic acid is 4.76.)

(Global Positioning System) and GIS (Geographic Information Systems) both utilize location- based services. What are location- based services and what are some of the exciting new applications of LBS in your opinion? Give an example of how you personally have used related services.

InPython,

Create a list of strings, don’t ask from the user, and return a list with the strings in sorted order, except group all the strings that begin with 'x' first.

e.g. ['mix', 'xyz', 'apple', 'xanadu', 'aardvark'] yields

['xanadu', 'xyz', 'aardvark', 'apple', 'mix']

# Hint: this can be done by making 2 lists and sorting each of them before combining them.

(a) How many grams of CaCl2 are needed to make 250.9 g of a solution that is 30.5% (m/m) calcium chloride in water? Note that mass is not technically the same thing as weight, but (m/m) has the same meaning as (w/w).

-How many grams of water are needed to make this solution?

(b) What is the volume percent % (v/v) of an alcohol solution made by dissolving 117 mL of isopropyl alcohol in 747 mL of water? (Assume that volumes are additive.)

(c) The mass of solute per 100 mL of solution is abbreviated as % (m/v). (The abbreviation % (w/v) is also common.) How many grams of sucrose are needed to make 735 mL of a 34.0% (w/v) sucrose solution?

The total factory overhead for Diva-nation is budgeted for the year at $169,465, divided into four activities: cutting, $18,130; sewing, $34,121; setup, $87,055; and inspection, $30,159. Diva-nation manufactures two types of men’s pants: jeans and khakis. The activity-base usage quantities for each product by each activity are as follows:

Each product is budgeted for 20,000 units of production for the year.

In the television show “The Six Million Dollar Man”, Colonel Austin had superhuman powers. In one episode, he tries to catch a man fleeing in a sports car. We’ll assume in this problem that the distance between them at t=0 is 100 m. The car starts at rest. At t = 0.0 s, the driver notices Colonel Austin. From then on, the car accelerates at 5.0 m s -2 , away from Austin. Sweet, but a bit slow on the uptake, Colonel Austin remains motionless until t = 2.0 s, at which point he begins his pursuit, at a constant speed of 50 m/s. a) How far ahead is the car when Colonel Austin begins to move? b) At what time (t>0) is Austin furthest ahead of the car? And what is that separation? c) At what time(s) does Austin catch the car? d) What is the critical initial separation (all other parameters remaining the same) beyond which Colonel Austin will never catch the car?

Marvel Parts, Inc., manufactures auto accessories. One of the company’s products is a set of seat covers that can be adjusted to fit nearly any small car. The company has a standard cost system in use for all of its products. According to the standards that have been set for the seat covers, the factory should work 1,065 hours each month to produce 2,130 sets of covers. The standard costs associated with this level of production are:

During August, the factory worked only 1,050 direct labor-hours and produced 2,700 sets of covers. The following actual costs were recorded during the month:

At standard, each set of covers should require 2.0 yards of material. All of the materials purchased during the month were used in production.

Required:

1. Compute the materials price and quantity variances for August.

2. Compute the labor rate and efficiency variances for August.

3. Compute the variable overhead rate and efficiency variances for August.

(Indicate the effect of each variance by selecting "F" for favorable, "U" for unfavorable, and "None" for no effect (i.e., zero variance). Input all amounts as positive values.)

QUESTIONS TO ANSWER:

1. Materials Price Variance

Materials Quantity Variance

2. Labor Rate Variance

Labor Efficiency Variance

3. Variable Overhead Rate Variance

Variable Overhead Efficiency Variance

Today’s price of Delta is $150 per share. You are neither bullish nor bearish about Delta, but you believe that the share price will not move by a lot in the near future. To implement your view, you decide to sell a straddle with one month until maturity. An option dealer provides you quotes on one-month Delta options. For a call option with a strike of $150, the dealer quotes you a price of $4.32. For a put option with a strike of $150, the dealer quotes you a price of $4.32. The c.c. risk-free rate is zero. What is the profit to the short straddle if Delta trades at $200 per share in one month?

There are 2 breakevens, what is the high and what is the low? (There should be two answers, one for high and one for low)

Consider the following reaction. 2NO2(g)⇌N2O4(g) When the system is at equilibrium, it contains NO2 at a pressure of 0.722 atm, and N2O4 at a pressure of 0.0521 atm. The volume of the container is then reduced to half its original volume. What is the pressure of each gas after equilibrium is reestablished?

PNO2= ?? atm

PN2O4= ?? atm

Part C

Go to the Phase Changes tab. Select the particular molecule, and set the temperature to the given values by using the stove to increase or decrease the temperature. Increase the pressure of the cylinder by moving the lid of the cylinder down with the help of the finger. The pressure of the cylinder is indicated by the pressure gauge on the top left corner of the simulation. On the right-hand side of the simulation is the phase diagram for the molecule.

As the molecules collide on the walls of the cylinder, the pressure of the cylinder does not remain constant; it fluctuates slightly as indicated by the gauge.

In the phase diagram, observe the red point. When a particular molecule is selected, set the temperature and pressure condition to the required value. Observe the position of the red point on the phase diagram when the pressure reaches approximately near the required value.

Which of the following conditions will result in the formation of a supercritical fluid?

Check all that apply.

2. Mansfield Company makes wiring harnesses for the automotive industry. Its standard costs for each harness are 2 direct labor hours per unit at $23 of labor cost per hour, and one pound of plastic harness material at $1.25 per pound. Actual manufacturing data for the period are as follows: Number of Units Manufactured 40,000 Number of Direct Labor Hours Used 79,400 Actual Direct Labor Cost $1,746,800 Number of Pounds of Direct Material Used 40,800 Number of Pounds of Direct Material Purchased 41,000 Actual Direct Material Cost $51,000 Calculate Direct Labor Rate Variance __________ Calculate Direct Labor Quantity Variance __________ Calculate Direct Material Price Variance __________ Calculate Direct Material Quantity Variance __________

What are the dangers of nuclear radiation? Is radiation less dangerous than we think? More dangerous? What radiation dangers do you think are worth worrying about, and what are not? What facts and examples support your conclusions?

The 2011 meltdown of 3 reactors at the Fukushima Daiichi nuclear power plant is in the news again this week as the criminal trial against the plant executives comes to a close. How deadly was the Fukushima disaster? (And how does this compare to the deadliness of the earthquake and tsunami that caused it?) Have you heard of Masao Yoshida, and why people consider him the hero of Fukushima?

What is the connection between the Pauli Exclusion principle, the Aufbau principle, the indeterminacy of fermions, electron configurations and quantum numbers. Why is shielding more effective for electrons in orbitals with lower principal quantum number than for electrons within the same shell?

Gas chromatography and the quantitative method of standard addition to constant volume were used to investigate the concentration of 2,4‑dichlorophenoxyacetic acid (a chlorinated phenoxy herbicide) in a water sample from Lake Eildon.

Liquid-liquid extraction using dichloromethane was used to extract 1.00 L of water sample and the combined extracts were made up to 25 mL in a volumetric flask. A 5.00 mL aliquot of the combined extract was added to each of two 10 mL volumetric flasks. To one flask was added 50.00 μL of a 1.150 x 10^-4 M standard solution of 2,4‑dichlorophenoxyacetic acid. Both flasks were then made up to the final volume. The GC analysis of 10.00 μL of injected sample from each flask resulted in peak areas of 245 mV.s and 290 mV.s for the signal in the chromatograms due to 2,4‑dichlorophenoxyacetic acid.

(Relative molar mass of 2,4-dichlorophenoxyacetic acid = 221.04 g.mol^-1)

(i). Calculate the concentration (mol/L) of 2,4-dichlorophenoxyacetic acid in the working standard solution used for quantitative analysis of the analyte

(ii). Write the standard addition equation and identify the terms to be applied

(iii). Apply the standard addition equation and determine the concentration in mg/L of 2,4‑dichlorophenoxyacetic acid in the original water sample from Lake Eildon

(iv). Identify the likely sources of experimental error in the laboratory method and calculate the percentage error in the value for the concentration of 2,4‑dichlorophenoxyacetic acid determined in (iii) (2 + 4 = 6 marks). Briefly, discuss how you would confirm the validity of the value determined in (iii)

(v). Discuss the likely health risks associated with a concentration of 30 μg/L of 2,4‑dichlorophenoxyacetic acid as compared to typical values found in Australian drinking waters

(vi) Discuss the effectiveness of dissolved oxygen to other common water treatment processes to effectively remove 2,4‑dichlorophenoxyacetic acid from Australian drinking waters

1. Give a summary of some of the main ways in which complexity manifests

   itself in physiological systems.

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