Order these chemical species by increasing pH of an 0.1M aqueous solution of each. That is, imagine making an 0.1M solution of each species. Select 1 next to the species that makes the solution with the lowest pH. Select 2 next to the species that makes the solution with the next higher pH, and so on. Notice that some of the rankings have been filled in for you already. Also notice that water is on the list. For that particular case, just compare the pH of pure water to the pH of the other solutions. Note for advanced students: for all charged species, you may assume the necessary counterions act as neither acids nor bases. species relative pH of 0.1M aqueous solution HF ▼(Choose one) ClO2− ▼(Choose one) HClO2 1 (lowest) H2O 4 NO2− 7 OH− ▼(Choose one) F− 6 HNO2 ▼(Choose one)

Order these chemical species by increasing pH of an 0.1M aqueous solution of each. That is, imagine making an 0.1M solution of each species. Select 1 next to the species that makes the solution with the lowest pH. Select 2 next to the species that makes the solution with the next higher pH, and so on. Notice that some of the rankings have been filled in for you already. Also notice that water is on the list. For that particular case, just compare the pH of pure water to the pH of the other solutions. Note for advanced students: for all charged species, you may assume the necessary counterions act as neither acids nor bases. species relative pH of 0.1M aqueous solution H2C2O4 ▼1 (lowest) H3O+ ▼(Choose one) H3PO4 4 HIO3 2 IO3− ▼(Choose one) HC2O4− 7 H2O 5 H2PO4− ▼(Choose one)

1. For the next few questions, consider a network formed by 500 students in a dorm as the nodes.

The edges in this network represent roommate relationships, i.e. two nodes are connected if they are currently roommates. In this form, the rooms are mostly double occupancy with a few triples and quads.

What is the mode (most frequent value) of the node degrees?

2. Consider the aforementioned roommate network. How many nodes are in the largest clique in the network?

3.Consider the aforementioned roommate network. Would an adjacency matrix of this graph contain mostly ones or zeros?

4.Consider the aforementioned roommate network. Among the following types of network representations, which would be more compact? Adjacency Matrix or Adjacency List?

5.Consider the aforementioned roommate network. Which of the following best describes the connectivity of this graph?

Not connected

Weakly connected

None of the above

Strongly connected

You're a statistics professor and the deadline for submitting your students' grades is tonight at midnight. Each student's grade is determined by their mean score across all of the tests they took this semester.

(The mean is the average of the numbers. It is easy to calculate: add up all the numbers, then divide by how many numbers there are)

You've decided to automate grade calculation by writing a Python program that takes a list of test scores and prints a one character string representing the student's grade calculated as follows:

90% <= mean score <= 100%: "A",
80% <= mean score < 90%: "B",
70% <= mean score < 80%: "C",
60% <= mean score < 70%: "D",
mean score < 60%: "F"

For example, if list1 = [92, 94, 99], it would print "A" since the mean score is 95, and if list1 = [50, 60, 70, 80, 90], it would return "C" since the mean score is 70.

Q1:

Let’s say our research question we want to find the average (mean) wage among all workers in the United States. Let’s say (and this is obviously not a very good method) we go around UC and stop 500 people and ask them what their wage is and calculate the mean wage.

• What is our population?
• What is our sample?
• What is the parameter?
• What is the statistic?
• What are some problems with our sampling method?

Q2:

Identify the scale of measurement: nominal, ordinal, interval, ratio

• Zip codes
• Stock prices
• Item size (small, medium, large)
• Income of households, measured in dollars
• Educational level, recorded as (High School, some college, college graduate)
• Test score (0-100), measuring score on first statistics exam
• Test score (0-100), measuring overall knowledge of statistics
• A video game was previewed to a group of 30 teenagers. The teens were asked to rate the quality of the graphics.

Q3

A paper manufacturer in Country A sells much of its paper in Country B. The manufacturer is paid in Country​ B's dollars, but pays its employees in Country​ A's dollars. The manufacturer is interested in the fluctuating exchange rate between these two currencies. Each trading day in 2005 the exchange rate fluctuated by several basis points.​ (A basis point is 1/100 of a​ percent.) A year of data is collected.

• Identify whether the data are cross sectional or a time series.
• Give a name to each variable and indicate if the variable is​ categorical, ordinal, or numerical​ (if a variable is​ numerical, include its units if​ possible)
• List any concerns that you might have for the accuracy of the data. Select all that apply.

1. The recorded exchange rates might not be accurate for 2005.
2. The fluctuations of the exchange rate in 2005 might not be typical of other years.
3. The exchange rate is dependent on the country in which the data is recorded.
4. There are no concerns regarding the accuracy of the data.

Q4: A bakery is trying to decide what makes a loaf a bread sell. There are three locations of this bakery and they gather data at all three locations. They measure the volume of the loaf and whether or not it has nuts in it. They then time how long it takes the loaf to sell. What are the cases? (unit of observation) List the variables and the scale of measurement

Q5:

• Why is the median not an acceptable measure for nominal data?

• Why is the mean not an acceptable measure for ordinal data?

• In a strongly skewed distribution, would you prefer the mean or the median?

Q6:

Clara asked twenty-one people what their favorite number is. Please calculate the most complex yet appropriate measure of central tendency for the following data:

7, 3, 0, 7, 8, 2, 1, 2, 7, 6, 10, 6, 7, 1, 10, 0, 6, 8, 10, 3, 1

Are the following functions satisfiable?
If the function is satisfiable, with a single line containing 4 comma-separated values, each of

which is either True or False, for x, y, z, v in this order. For example, you would submit: True,False,True,False.

If the function is not satisfiable, use the laws of propositional logic to prove that the function is a contradiction.

a) xy ̄+zv
b) (x+y)(x ̄+z)(y ̄+z ̄)(x+v)
c) xx ̄+yy ̄+zz ̄+vv ̄
d) (x+y)(x+y+z)+not(x+y+z)not(x+y+z+v)

A system of N identical, non-interacting particles are placed in a finite square well of width L and depth V. The relationship between V and L are such that only 2 bound states exist. What is this relationship? Hint: What is the requirement on E for a bound state? For these two bound states, what is the expected energy of the system as a function of temperature? The result only applies when T is low enough so that the probability of populating a state with E>V is very small. In this range of temperatures, what is the constant volume c(T)? Again for constant volume, what is the change in entropy between two temperatures?

make a simple sketch of the complete, static system. Label buildings and structures by name. Label elevations of each building or structure in terms of water column or to ground level at the base of the tower.

Use continuity equation (Q = V * A). A pipe with 4.026 inch ID is carrying 100gpm. Calculate the velocity (fps) of the water in the pipe.

A farmer replaces the 4-inch pipe in the listed problem with a 1.610 inch ID pipe. What is the velocity given that Q = 100gpm?

Use the equation Q = V * A. What diameter of pipe is required if the velocity (V) has to be maintained at 7fps and the Q = 25gpm?

You are titrating 110.0 mL of 0.050 M Ca2 with 0.050 M EDTA at pH 9.00. Log Kf for the Ca2 -EDTA complex is 10.65, and the fraction of free EDTA in the Y4– form, αY4–, is 0.041 at pH 9.00. PLEASE ANSWER ALL PARTS: A, B, C, D, AND E.

(a) What is K\'f, the conditional formation constant, for Ca2 at pH 9.00?

(b) What is the equivalence volume, Ve, in milliliters?

(c) Calculate the concentration of Ca2 at V = 1/2 Ve.

(d) Calculate the concentration of Ca2 at V = Ve.

(e) Calculate the concentration of Ca2 at V = 1.1 Ve.

Exercise 18.62

Calculate E∘cell for each of the following balanced redox reactions.

Part A

O2(g)+2H2O(l)+4Ag(s)→4OH−(aq)+4Ag+(aq)

Express your answer using two significant figures.

E∘cell = 

  V  

Part B

Br2(l)+2I−(aq)→2Br−(aq)+I2(s)

Express your answer using two significant figures.

E∘cell = 

  V  

Part C

PbO2(s)+4H+(aq)+Sn(s)→Pb2+(aq)+2H2O(l)+Sn2+(aq)

E∘cell =      v