Explain how the text structure in the first, third, or fourth pargraph contributes to the authors development of ideas in…

Explain how the text structure in the first, third, or fourth pargraph contributes to the authors development of ideas in…. Explain how the text structure in the first, third, or fourth pargraph contributes to the authors development of ideas in the article. Give speific evidence in your response.

Explain how the text structure in the first, third, or fourth pargraph contributes to the authors development of ideas in…

1. Use the second member of each group from Group IA to Group 7A to show that the number of valence electrons on an atom of the element is the same as its group number.

1. Use the second member of each group from Group IA to Group 7A to show that the number of valence electrons on an atom of the element is the same as its group number..  

 

Written Assignment 9: Chemical Bonding

 

Answer all assigned questions and problems, and show all work.

 

1.      Use the second member of each group from Group IA to Group 7A to show that the number of valence electrons on an atom of the element is the same as its group number.
(8 points)

Li has 1 valence electron

Cl has 7 valence electrons

(Reference: Chang 9.2)

 

 

 

2.   Explain the following: (3 points)

a.       ionic bond=electrostatic force that holds ions together in an ionic compound.

 

b.      nonpolar covalent bond=electrons are shared equally between the two atoms.

 

c.       polar covalent bond= the electrons spend more time in the vicinity of one atom than the other.

 

 

3.      Specify which compound in the following pairs of ionic compounds has the higher lattice energy: Explain your choice. (6 points)

a.       KCl or MgO=MgO

 

b.      LiF or LiBr=LiBr

 

c.       Mg3N2 or NaCl=NaCl

(Reference: Chang 9.23)

 

 

 

 

4.      Compare the properties of ionic compounds and covalent compounds. (6 points)

 

Electronegativity is a property of atoms, not bonds. An ionic bond is formed between elements with very different electronegativities, a covalent bond between atoms with similar electronegativities.

                (Reference: Chang 9.32)

 

 

 

5.      Four atoms are arbitrarily labeled D, E, F, and G. Their electronegativities are as follows: D = 3.8, E = 3.3, F = 2.8, and G = 1.3. If the atoms of these elements form the molecules DE, DG, EG, and DF, how would you arrange these molecules in order of increasing covalent bond character?  (4 points)

DG,EG,DF,DE

(Reference: Chang 9.37)

6.     Classify the following bonds as ionic, polar covalent, or nonpolar covalent, and

give your reasons:  (4 points)

a.       the CC bond in H3CCH3- Covalent

b.      in KI the KI bond- Ionic

c.       the NB bond in H3NBCl3– Polar Covalent

d.      the CF bond in CF4– Polar Covalent

(Reference: Chang 9.39)

 

 

 

7.      Write the correct Lewis structures for the following compounds (relative positions of atoms are shown correctly). (21 points)

a.       H   C   N

b.      H   C   C   H

c.       O   Sn   O

d.      F        F

     B

     F

 

e.       H   O   F

f.       H
       C    F

O

g.      F         F

                  N

                  F

(Reference: Chang 9.47)

 

 

 

8.      Classify the following substances as ionic compounds or covalent compounds containing discrete molecules: CH4, KF, CO, SiCl4, BaCl2.(5 points)
CH4=Covalent KF=Ionic CO=Covalent SiCl4=Covalent BaCl2=Ionic

(Reference: Chang 9.73)

 

 

 

9.      Predict the geometries of the following species using the VSEPR method: (a) PCl3,
(b) CHCl3, (c) SiH4, (d)TeCl4.  (12 points)

a.       1 lp AX3E trigonal pyramidal

b.      0 lp AX4 tetrahedral

c.       0 lp AX4 regular tetrahedral

d.      1 lp AX4E a see-saw structure

            (Reference: Chang 10.7)

 

 

 

10.  Predict the geometry of the following molecules using the VSEPR method: (a) HgBr2,
(b) N2O, (c) SCN– (arrangement of atoms is SCN).  (9 points)

 

            (Reference: Chang 10.11)

a.linear

b.linear

c.linear

 

 

 

 

 

      11.  Describe the geometry around each of the three central atoms in the CH3COOH

molecule.
(5 points)

1. Tetrahedral, four bonds, 109.5 degrees apart, sp3 hybridization

2. Trigonal planar, three bonds (one double, to O), sp2 hybridization

3. Bent (at about 109.4 with two lone pairs, sp3 hybridization

            (Reference: Chang 10.13)

 

 

 

12.     What is the relationship between the dipole momentand bond moment? How is it

possible to have bond moments and yet be nonpolar? (3 points)

 

1.The dipole moment can be thought of as the sum of the bond dipoles in a molecule. If you have a molecule that consists of only one bond, then the dipole moment will be the same as the bond dipole. Most molecules have a dipole moment owing to the uneven distribution of charges about the molecule.

2.Because those molecules are symmetrical. CO2 and CCl4 are examples. the dipole moments of each bond cancel.

(Reference: Chang 10.16)

 

 

 

13.     Specify which hybrid orbitals are used by carbon atoms in the following species:

(a) CO,
(b) CO2, (c) CN–.  (6 points)

a.       sp + p + p.

b.      sp

c.       sp + p + p.

 

(Reference: Chang 10.37)

 

 

 

14.     How many sigma bonds and pi bonds are there in each of the following 

        Molecules? (6 points)

 

 

a.4 sigma bonds

 

 

b.5 sigma bonds and 1 pi bond 

 

 

c.7 sigma bonds and 3 pi bonds

(Reference: Chang 10.41)

 

 

15.  Which of the following species is not likely to have a tetrahedral shape? (a) SiBr4 (b) NF4+, (c) SF4, (d) BeCl4–2, (e) BF4–, (f) AlCl4–(6 points)

c.SF4

(Reference: Chang 10.71)

 

 

1. Use the second member of each group from Group IA to Group 7A to show that the number of valence electrons on an atom of the element is the same as its group number.

WIND POWER

WIND POWER.  

You must choose a topic in modern chemistry for your term paper. See suggested topics you can pick from in the Discussions Section of Canvas. Each student will write a 3 to 4-page term paper.   Sign up for one topic by emailing me a topic that you want to write about. Once a suggested topic is requested from below, it will be removed from the list of available topics that will be updated under Term Paperdiscussion board. You are free to come up with your own topic of interest but email it to me for approval.  Keep a record of the topic that you sign up for.

For the paper, use size 12 font, Times New Roman, double-spaced. Include a title page and a reference page and these do not count as one of the 3 to 4 pages.  Each student will write this paper in his/her own words and must include all references.  Use at least 5 references. Remember, plagiarism is academic dishonesty. Your submitted paper will be checked for plagiarism.

The title page must include the title of the paper, your name and date of submission.

WIND POWER

chem 1105

chem 1105. chem help from someone that is good in the subject. I would like to work with someone i have already work with but the site is different and have no idea how to find any tutor i have worked with before

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CHEMISTRY CHAPTER 2

CHEMISTRY CHAPTER 2. Exercise 2.50: Problems by Topic – Atomic Theory, Nuclear Theory, and Subatomic Particles

Which of the following statements about subatomic particles are false?

Part A

Protons and electrons have charges of the same magnitude but opposite sign.

[removed]True

[removed]False

Part B

Protons have about the same mass as neutrons.

[removed]True

[removed]False

Part C

Some atoms don’t have any protons.

[removed]True

[removed]False

Part D

Protons and neutrons have charges of the same magnitude but opposite sign.

[removed]True

[removed]False

Exercise 2.58: Problems by Topic – Isotopes and Ions

Uranium-235 is used in nuclear fission.

Part A

Determine the number of protons and neutrons in uranium-235.

Enter your answers numerically separated by a comma.

N p , N n = 

 

 

Part B

Write its symbol in the form AZ X .

Express your answer as an isotope.  

 

Exercise 2.60: Problems by Topic – Isotopes and Ions

Determine the number of protons and electrons in each of the following.

 

Part A

Zn 2+

Enter your answers numerically separated by a comma.

N p , N e = 

 

 

Part B

P 3−

Enter your answers numerically separated by a comma.

N p , N e = 

 

 

Part C

Fe 3+

Enter your answers numerically separated by a comma.

N p , N e = 

 

 

Part D

Sr 2+

Enter your answers numerically separated by a comma.

N p , N e = 

 

 

 

Exercise 2.74: Problems by Topic – The Periodic Table and Atomic Mass

Silicon has three naturally occurring isotopes with the following masses and natural abundances:

Isotope

Mass (amu)

Abundance (%)

Si−28

27.9769

92.2

Si−29

28.9765

4.67

Si−30

29.9737

3.10

Part A

Calculate the atomic mass of silicon.

Atomic mass = 

 

 

 

Exercise 2.79: Problems by Topic – The Mole Concept

Part A

How many sulfur atoms are there in 4.5 mol of sulfur?

Express your answer using two significant figures.

 

 

 

 

Exercise 2.81: Problems by Topic – The Mole Concept

What is the amount, in moles, of each of the following substances?

 

Part A

12.2 g Ar

 

 

Part B

3.75 g Zn

 

 

Part C

26.6 g Ta

 

 

Part D

0.219 g Li

 

 

 

Exercise 2.82: Problems by Topic – The Mole Concept

What is the mass, in grams, of each of the following?

Part A

2.3×10−3 mol Sb

Express your answer using two significant figures.

 

 

 

Part B

3.53×10−2 mol Ba

Express your answer using three significant figures.

 

 

 

Part C

43.6 mol Xe

Express your answer using three significant figures.

 

 

 

Part D

1.1 mol W

Express your answer using two significant figures.

 

 

 

 

Exercise 2.76: Problems by Topic – The Periodic Table and Atomic Mass

The atomic mass of copper is 63.546 amu

 

Part A

Do any copper isotopes have a mass of 63.546 amu ?

[removed]yes

[removed]no

Part B

Explain.

Exercise 2.36: Problems by Topic – The Laws of Conservation of Mass, Definite Proportions, and Multiple Proportions

Upon decomposition, one sample of magnesium fluoride produced 1.65 kg of magnesium and 2.57 kg of fluorine. A second sample produced 1.31 kg of magnesium.

 

Part A

How much fluorine (in grams) did the second sample produce?

 

 

 

 

CHEMISTRY CHAPTER 2

Ashford 6: – Week 5 – Final Paper

Ashford 6: – Week 5 – Final Paper.  

Final Paper

 

Scenario:
As the newly appointed safety manager at a large plastics manufacturing company, you are called to the loading dock to find that a large truck, full of cartons of pellets used in the manufacturing process, is engulfed in flames. The truck slid on ice in the parking area and crashed into empty trailers. A call to the city emergency services indicated that they will be delayed indefinitely due to roads made impassible by the ice storm. The Material Safety Data Sheet (MSDS) for the pellets indicates that burning releases toxic smoke. Note that larger companies are likely to have their own emergency response teams equipped and trained to handle the most likely hazards found at the site.

Assignment:
Prepare an Incident Action Plan that includes all of the requirements shown below. Respond to each bullet point based on what you know of the situation. Clearly state any assumptions you make in your plan. The list is a subset of the United States Department of Health & Human Services’ suggested comprehensive Incident Action Plan available at www.phe.gov/Preparedness/planning/.

 Identify at least two incident goals (i.e., where the response system should be at the end of response) and at least two operational objectives (i.e., major areas that must be addressed in the specified operational period to achieve the goals or control objectives).  Describe at least two response strategies (i.e., priorities and the general approach to accomplish the operational objectives) and at least two response tactics (i.e., specific methods developed to achieve the response strategies).  Prepare an organization list showing at least three primary roles and an assignment list with at least three specific tasks and their owners.  Explain a health and safety plan (to prevent responder injury or illness) that includes at least three provisions to ensure personnel safety. Summarize a communications plan (how functional areas can exchange information) with at least a primary and secondary method of communication.  Locate the incident using a map or precise verbal description that allows responders to find the area and indicate an area that non-responders should avoid.

 

Writing the Final Paper

 

The Final Paper:

 Must be seven to eight double-spaced pages in length (not including the title and reference pages), and formatted according to APA style as outlined in the Ashford Writing Center.  Must include a title page with the following: Title of paper  Student’s name  Course name and number  Instructor’s name  Date submitted  Must begin with an introductory paragraph that has a succinct thesis statement  Must address the topic of the paper with critical thought.  Must end with a conclusion that reaffirms your thesis.  Must use at least six scholarly sources, including a minimum of three from the Ashford Online Library, in addition to the textbook.  Must document all sources in APA style, as outlined in the Ashford Writing Center.  Must include a separate reference page, formatted according to APA style as outlined in the Ashford Writing Center.  

 

Carefully review the Grading Rubric for the criteria that will be used to evaluate your assignment.

 

 

 

Ashford 6: – Week 5 – Final Paper