victorayumba

(a) Classify the following elements as metals or nonmetals. (Selectall that apply.)
metals: non-metals:
Bi Rn C Bi Rn C
Ca Mg Ge Ca Mg Ge
Ba Si Au Ba Si Au
Ti Br Te Ti Br Te

(b) The distinction between metals and nonmetals is really not aclear one. Some elements, called metalloids, are intermediate intheir properties. Which of these elements and other elements in theperiodic table would you classify as metalloids? (Select all thatapply.)
At Li Sb
Si I Na
V Te Hg
As Al B

Which elements are semiconductors? Identify the elements that behave as semiconductors by dragging them into the container. At Po Bi Pb I Te Sn S Se B C N Al Si P Ga Ge As Sb

Collect and Organize
We are asked to identify elements that behave as semiconductors. Review your knowledge of the periodic table to answer this question.

Analyze
We know the elements on the left of the periodic table are metals and elements on the right are nonmetals. If we remember correctly, we know there is a group of elements that are called metalloids. If these elements are highlighted in the periodic table, they form a staircase that separates the metals from the nonmetals. So where is that staircase located?

NOTE:

(Se, B, Al, Si, P, Ga, Ge, As and Sb) is not the correct answer.

What’s My Element?

All the elements in the periodic table are competing to earn the title of World’s Greatest Element. You are an element and need to convince the world that YOU deserve to wear that title. Conduct research on your element and create a presentation that convinces everyone to elect you the World’s Greatest Element. You may use the links provided in the previous lessons or locate some of your own.

Directions: Follow these steps to complete the assignment.

Step 1. Identify an element from the periodic table and assume that role

Step 2. Research the element using books, internet, or other materials

Step 3. Create a presentation about yourself (the element) that tells all about this element, its characteristics and its uses.

Total Possible Points

A company manufactures two products (A and B) and the profit per unit sold is £3 and £5 respectively. Each product has to be assembled on a particular machine, each unit of product A taking 12 minutes of assembly time and each unit of product B 25 minutes of assembly time. The company estimates that the machine used for assembly has an effective working week of only 30 hours (due to maintenance/breakdown). Technological constraints mean that for every five units of product A produced at least two units of product B must be produced. Formulate the problem of how much of each product to produce as a linear program. Solve this linear program graphically. The company has been offered the chance to hire an extra machine, thereby doubling the effective assembly time available. What is the maximum amount you would be prepared to pay (per week) for the hire of this machine and why

A shopkeeper has a vessel which is full of vinegar. (1/4) of the vinegar is taken out and the vessel is filled with water. If the process is repeated 4 times and 10 liters of vinegar is now left in the vessel, so what is the capacity of the vessel?

Options:

2760/81 liters

2560/81 liters

33 liters

32 liters

Six students (Dave, Michael, Ann, Joe, Jane, Bill) are attending a lecture in a class-
room with 10 seats. The seats are in a single row as follows
A B C D E F G H I J

All valid seating arrangements are equally likely. By valid seating arrangement we
mean that all students have to sit down in a seat and students can not share seats.
Here is an example of a valid seating arrangement:
Dave - B, Michael - A, Ann - E, Joe - I, Jane - H, Bill - F
(a) How many seating arrangements are there? Note that who sits where matters.
(b) What is the probability of the seating arrangement
Dave - A, Michael - C, Ann - D, Joe - H, Jane - I, Bill - J?
(c) What is the probability that Dave sits in seat A?
(d) What is the probability that seats A, C, D, H, I and J are occupied?
(e) What is the probability that seat A is occupied?
(f) What is the probability that Dave sits in A and Michael sits in C or Dave sits in
A and Bill sits in F?

Hello, this question is extremely important. Rating highestlevel, but you must answer all 5 parts of question to receive fullcredit. Please list all steps, graphs, etc. as they're needed andany intuition you used to complete problems. Thank you,

8. An abrupt silicon p-n junction has NA = 2 x 10^14 cm^-3 on one side andND = 5 x 10^15 cm-3 on theother. At atemperature of 300°K

a) (4) Find the position of the Fermi levels in both the p and nregions
b) (4) Find the majority concentrations in each region
c) (4) Find the minority concentrations in each region
d) (4) Draw and label the equilibrium band diagram
e) (4) Determine the size of the potential "hill"

Semiconductor Summary

Nc (cm^-3) - Effective Density ofStates for electrons

N_V (cm^-3) - EffectiveDensity of States for holes

n_i (cm^-3) - IntrinsicCarrier Concentration

n_n, p_p (cm^-3) -Majority Carrier Concentrations (electrons in n-type or holes inp-type)

n_p, p_n (cm^-3) -Minority Carrier Concentrations (electrons in p-type or holes inn-type)

N_D (cm^-3) - Donor DopingConcentration (density of donor atoms)

N_A (cm^-3) - Acceptor DopingConcentration (density of acceptor atoms)

E_F (eV) - Fermi level in extrinsicmaterial

E_Fi (eV) - Fermi level in intrinsicmaterial

A 30-g ice cube at its melting point is dropped into an insulated container of liquid nitorgen. How much nitrogen evaporates if it is at a boiling point of 77 K and has a latent heat of vaporization of 200 kJ/kg? Assume for simplicity that the specific heat of ice is a constant and is equal to its value near its melting point.

What is the degree of nitrogen liquid

Imagine you are a business leader aiming to create a company culture that fosters both meaningful work for employees and responsible practices that positively impact society. 

1. Factors Influencing Meaningful Work: Discuss the various factors that contribute to making work meaningful for individuals. How do elements like alignment with personal values, interests, and societal impact intersect to create a fulfilling work experience?

2. Downtime and Well-being: Reflect on the relationship between downtime and mental, physical, and creative well-being. How can adequate downtime contribute to increased productivity and innovation within a professional context?

Hello, this question is extremely important. Rating highestlevel, but you must answer all 5 parts of question to receive fullcredit. Please list all steps, graphs, etc as they’re needed andany intuition you used to complete problems. Thank you,

7. The Fermi level lies 0.522 eV above the valence band in a sampleof silicon at 300°K.

a) (3) Is this n-type or p-type material and why?
b) (1) Are the impurity atoms donors or acceptors?
c) (4) Find the majority carrier concentration
d) (8) Find the minority carrier concentration (2 ways)
e) (4) Find the concentration of impurity atoms
HINT for part e): Use the concentration formulas not the Fermilevel sinh"1 formula!

Formulas:

Semiconductor Summary

Nc (cm^-3) - Effective Density of States forelectrons

N_V (cm^-3) - EffectiveDensity of States for holes

n_i (cm^-3) - IntrinsicCarrier Concentration

n_n, p_p (cm^-3) -Majority Carrier Concentrations (electrons in n-type or holes inp-type)

n_p, p_n (cm^-3) -Minority Carrier Concentrations (electrons in p-type or holes inn-type)

N_D (cm^-3) - Donor DopingConcentration (density of donor atoms)

N_A (cm^-3) - Acceptor DopingConcentration (density of acceptor atoms)

E_F (eV) - Fermi level in extrinsicmaterial

E_Fi (eV) - Fermi level in intrinsicmaterial

Working on my fermi level project. Interested in determining theintrinsic carrier concentration of gallium nitride (GaN).

T=300; % Temperature in Kelvin
k=8.617e-5; % Boltzmann constant (eV/K)
e0=8.85e-14; % permittivity of free space (F/cm)
q=1.602e-19; % charge on an electron (coul)
KS=8.9; % Dielectric constant of GaN
ni=X; % intrinsic carrier conc. in Galium Nitride at 300K
EG=3.44 ; % Galium Nitride band gap (eV)

Could you show steps on how you calculated X?

Honestly, just give me a value and show me how you got there. Cutthe gibberish.
Its couple hours before sunrise.

Intrinsic carrier concentration:
ni = (Nc·Nv)^(1/2)*exp(-Eg/(2kBT))

Effective density of states in the conduction band: Nc
Zinc Blende
Nc = 2.3*(1e14)*T^(3/2) (cm-3)

Effective density of states in the valence band: Nv
Zinc Blende BN
Nv = 8.0*(1e15)*T^(3/2) (cm-3)

Helpful Source: http://www.ioffe.ru/SVA/NSM/Semicond

1. Step 1: Choose one of the following selections for reading.

Step 2: Complete the Lesson Revew.

How to Speak and Write Correctly

OR

We the Media

Lesson Review

Directions: For each question, write your answer in complete sentences. Use supporting details from the lesson to justify your answers. Do not copy and paste text but use your own words to demonstrate understanding of the lesson concepts. Remember to cite your resources. Citation examples are provided below the Review.

1. What type of genre is this selection? What led you to this conclusion?

2. What did you specifically like or dislike about the selection? Your response must be at least 5-7 sentences in length. Use details from the story to support your response.

3. What do you think is the purpose of this selection? Is it entertaining, informative, didactic (teaching a lesson), philosophical, argumentative, or some combination of these?

4. Do the title or opening lines give any clues to the purpose? If so, what are these clues?

Working on my fermi level project. Interested in determining theintrinsic carrier concentration of gallium nitride (GaN).

T=300; % Temperature in Kelvin
k=8.617e-5; % Boltzmann constant (eV/K)
e0=8.85e-14; % permittivity of free space (F/cm)
q=1.602e-19; % charge on an electron (coul)
KS=8.9; % Dielectric constant of GaN
ni=X; % intrinsic carrier conc. in Galium Nitride at 300K
EG=3.44 ; % Galium Nitride band gap (eV)

Could you show steps on how you calculated X?

Honestly, just give me a value and show me how you got there. Cutthe gibberish.
Its couple hours before sunrise.

Intrinsic carrier concentration:
ni = (Nc·Nv)^(1/2)*exp(-Eg/(2kBT))

Effective density of states in the conduction band: Nc
Zinc Blende
Nc = 2.3*(1e14)*T^(3/2) (cm-3)

Effective density of states in the valence band: Nv
Zinc Blende BN
Nv = 8.0*(1e15)*T^(3/2) (cm-3)

Helpful Source: http://www.ioffe.ru/SVA/NSM/Semicond

If the Fermi energy of a silicon sample is uniformly 0.2 eV below the conduction band,
calculate:
a. Electron and hole densities
b. Doping concentration
Assume the bandgap is 1.12 eV, at room temperature and the effective density of states, Nc, is
2.86 x 1019 cm-3 and intrinsic carrier concentration is 9.65 x 109 cm-3.

which of the OECD statistics about the United States surprised you? Why did this surprise you?

One of the primary assumptions of economics is that people are rational and make rational economic choices based on available information. To examine this assumption, consider yourself a sample of one and examine your economic choices.

Respond to the following:

Identify and describe one of your recent economic decisions or choices. (Note that you need not share information you consider confidential.)

Explain why the decision was rational. Give reasons for your answer.

Provide an example where you have encountered increasing opportunity costs.

Describe the opportunity cost that this macroeconomiccollege course has for you. Are you more worried about losing time or money when you consider the choices you have to make? Examine how scarcity functions in your day-to-day life and how the economy perceives it.

You are required to emphasize the main actions of strategic leaders and their importance in organizations. In doing so, you are prompted to apply the concept to your own organization and present the key actions of the top management team. 

this is the Topic: Artificial Intelligence's Capability to Improve Mental Health Services

The literature review must be organized in a way that makes readers understand the studies you are reporting on because they include a lot of information in a limited amount of space. Two popular methods for doing literature reviews are topical, which groups studies according to a subject or theme, and chronological, which arranges papers in order of publication date. In addition to purposefully selecting a broad framework that suits the writer's subject, the writer should aid readers with headings, include succinct summaries at key points in the review, and use language that clearly identifies the scope of specific studies within the field of inquiry, the studies under review, and the area of the writer's own research. It could be beneficial to ask yourself some of the following questions whether you are editing your own or a peer's literature review:

Concerns Regarding Revision
1) Is the literature review arranged topically or chronologically? Is the author's method of writing the review clearly defined?
2) Does the author make use of headings or paragraph breaks to highlight differences between the study groups that are being examined?
3) Does the author provide a clear relationship to his or her topic to explain why particular study groups (or individual research) are being reviewed?
4) Does the author clearly state which of the mentioned studies are the most significant?
5) Has the author covered every significant field of inquiry into the subject matter?
6) Does the author employ summaries and transitions to smoothly flow from one study or series of studies to the next?

7) Is it evident why the present research is required by the end of the literature review?

also remember this is a draft so you might want to concentrate on the first and last paragraphs. also 400 words minimum 

Vesuvian volocano voles are usually black, but some are agouticolor. Agouti is the result of a dominant allele at an autosomallocus. Crosses were made between volcano voles known to behomozygous for the agouti allele and normal black individuals knownto be homozygous for the recessive allele. Out of 232 offspring,218 were agouti in color, but 14 were black.

a. What is the most likely genetic explanation for thisresult?

b. Is it possible that a cross between two black volcano voleschosen at random from the wild could yield three offspring, all ofwhich were agouti in color? Briefly explain your answer.

In mice, the A y allele of the agouti gene is a recessive lethalallele, but it is also dominant for coat color. What phenotype andratios would you expect from the cross of a mouse heterozygous atthe agouti locus (genotype A y A) and also at the albino locus (Cc)to an albino mouse (cc) homozygous at the agouti locus (A y A)?

The albinism gene is shown below. The disease is caused by a point mutation that blocks the first restriction site. Fill in the gel electrophoresis with the results of the RFLP analysis. Use this information to answer the following questions and fill in the gel and the Southern. Keep in mind how thick the bands should be!What size would you expect from a homozygous with no disease? (lane 1)What size would you expect from a heterozygote carrier? (lane 2)What size would you expect from a homozygous recessive with the disease? (lane 3)2kb0kb------------------------------------------------------------10kbSouthern Molecular Probe4kb123Southern Blot

1. In Gel electrophoresus of amplified PCR samples and stainging of agorse gels, why must the controls ( homozygous +/+, homozygous -/-, heterozygous +,-) be run through both PCR and gel electrophoresis steps?

a. Also according to the watson and crick papers about DNA, what is the novel feature of their model?

b. What comments do these authors make concering the relation of bases on one strand of the helix as compared to those on the others? How might this be suggestive of a possible copying mechanism for the genetic materal?

c.From these collective reports how many bases (residues) do the authors suggest occur in one turn of the helix?

d. Also, Watson and crick showed that a molecule of DNA can be broken length wise into linear halves by applying heat. What does this imply about the strength of the bons between the halfs of linear DNA? Are the bonds between the two halves likely to be stronger or weaker than the bonds that make up the sugar phosphate group?

) Watson and Crick refer to a model proposed by Pauling and Cory. Pauling and Cory proposed a triple helix with phosphates in the center (triangles in the figure below), and bases radiating outwards. A figure from their paper, viewing this structure end on, is shown below. List at least three different aspects of this model that are chemically improbable, or fail to accommodate information about DNA that was available in 1953, when the Pauling and Cory and Watson and Crick models were published. For each problem, explain if, and how, the Watson and Crick model overcomes the issue that you have identified.

Briefly describe the Watson and Crick structure of DNA and list the evidence used in proposing this structure.

9.1a. Describe Miescher’s work, the DNA-dye binding experiment, and what a bacteriophage is.

9.1b. Describe the significance of transformation experiments using bacteria and mammalian cells.

9.1c. Describe Watson and Crick’s model of the three-dimensional structure of DNA.

9.1d. List the four features of DNA that followed from the Watson?Crick model.

9.1e. Describe four ways the structure of DNA is suited to its function.

1) The strongly acidic nature of DNA poses a problem. Why do Watson and Crick think that the DNA “dyad”, formed by hybridization of two negatively charged molecules, will be stable?

2) Watson and Crick refer to a model proposed by Pauling and Cory. Pauling and Cory proposed a triple helix with phosphates in the center (triangles in the figure below), and bases radiating outwards. A figure from their paper, viewing this structure end on, is shown below. List at least three different aspects of this model that are chemically improbable, or fail to accommodate information about DNA that was available in 1953, when the Pauling and Cory and Watson and Crick models were published. For each problem, explain if, and how, the Watson and Crick model overcomes the issue that you have identified. Figure 6, reproduced from:

 3) What are tautomeric forms, and why did they pose a problem for the Watson and Crick model? Do you think that Watson and Crick adequately addressed the problem of tautomers?

4) RNA and DNA have different helical conformations. Why do Watson and Crick suggest that this is necessary?

5) Did Watson and Crick say too much or too little about the process of replication? Explain your view on this.

5. In many occasions an RNA strand is plotted in the following way

5 '_____________________3'

Explain what this graph means and write the structure of the next CAG codon and identify each part.

6. Are there DNA structures different from the one postulated by Watson and Crick? ____ Yes, _____NO Explain.

Explain DNA structures