CHEM HW 4

Chemistry 121 – Chemistry in the Modern World

Weekly Worksheet 4

Directions: Answer the following questions using your textbook. Remember, these are the types of questions that will be on the proctored exam. Create a separate Word document listing the correct answers submit it in the Assignments folder. Use as a title your name and the week number. For example, I would call this assignment Matton4. Each question is worth 1 or 2 points, for a total of 40 points.

1. Chapter 5, Question 1a

2. Chapter 5, Question 1b

3. Chapter 5, Question 4

4. Chapter 5, Question 6d (2 points)

5. Chapter 5, Question8b

6. Chapter 5, Question 8c

7. Chapter 5, Question 8d

8. Chapter 5, Question 9 (2 points)

9. Chapter 5, Question 15a (2 points)

10. Chapter 5, Question 15b

11. Chapter 5, Question 15c

12. Chapter 5, Question 22, please show your calculation to explain (2 points)

13. Chapter 5, Question 25 (2 points)

14. Chapter 5, Question 31

15. Chapter 5, Question 33 (2 points)

16. Chapter 5, Question 46 (2 points)

17. When magnesium reacts with chlorine, magnesium ions, Mg2+, and chloride ions, Cl-, are formed. In this reaction, magnesium atoms,

a. lose electrons.

b. gain electrons.

c. lose protons.

d. gain protons.

18. The number of electrons in a sodium ion, Na+, is,

a. 10.

b. 11.

c. 12.

d. 23.

19. The number of protons in a sodium ion, Na+ is,

a. 10.
b. 11.
c. 12.
d. 23.

20. Sodium chloride, NaCl, is a compound. Which of the following statements about NaCl is true?

a. It retains some of the properties of sodium.

b. It retains some of the properties of chlorine.

c. It retains some of the properties of both reactants.

d. It has entirely new properties.

21. When a bond is formed because of the attraction between positive and negative ions, this is known as a,

a. covalent bond.

b. crystal bond.

c. ionic bond.

d. molecular bond.

22. Potassium most commonly forms ions with a charge of,

a. +1

b. +2

c. +3

d. -1

23. A covalent bond is formed when a pair of electrons is,

a. transferred.

b. shared.

c. split.

d. destroyed.

24. In a nonpolar covalent bond, electrons are,

a. shared equally.

b. shared unequally.

c. transferred.

d. uncharged.

25. Which terms fits this definition? A measure of the tendency of an atom in a molecule to attract electrons to itself.

a. ionization

b. nonpolarity

c. nonbonding

d. electronegativity

26. Which substance has nonpolar covalent bonds?

a. O2

b. NO2

c. NaCl

d. CO

27. Ammonia is the common name for which molecule?

a. NH3

b. CH4

c. HCl

d. CCl4

28. In what group of the periodic table would elements that form ions with a positive charge of 2, +2, be found?

a. 1A, the Alkali Metals

b. 2A, the Alkali Earth Metals

c. 7A, the Halogens

d. 8A, the Noble Gases

29. In what group of the periodic table would elements that form ions with a negative charge of 1, -1, be found?

a. 1A, the Alkali Metals
b. 2A, the Alkali Earth Metals
c. 7A, the Halogens
d. 8A, the Noble Gases

30. The bond that forms between hydrogen and oxygen, H-O is best classified as,

a. Non-polar covalent

b. Polar covalent

c. Ionic

d. None of the above

31. The bond that forms between Mg and O in Magnesium oxide, MgO, is best classified as,

a. Non-polar covalent

b. Polar covent

c. Ionic
d. None of the above

32. If the electronegativity of two atoms in a bond is the same, what type of bond is predicted to form between them?

a. Non-polar covalent
b. Polar covent
c. Ionic
d. None of the above

33. In the bond that forms between nitrogen and oxygen, N-O which is true?

a. The bond is ionic.

b. The nitrogen has a partial positive charge.

c. The nitrogen has a partial negative charge.

d. There is no charge differential across the molecule

ANSWER THIS QUESTION!

1) Tell us about the properties of water.

 

Include information about density, ability to act as a solvent and specific heat.

CHOOSE one of the question to answer!!!

1. Consider This 5.8 (pg 205) – Thanks to several organizations, you can now calculate your water footprint.  A link is provided at the textbook’s website.

    a.  Calculate your personal water footprint.  What did you discover about your water usage?

    b. Do you feel that the survey was fair in assessing the water you use?  Explain.

    c. Name ways you now might use water differently, knowing what you know.

 

2.  Consider This 5.24 (pg 227) – Table 5.11 is merely a starting point for information available about contaminants in drinking water.  The EPA Office of Ground Water and Drinking Water offers a consumer fact sheet on dozens of contaminants.  Both general summaries and technical fact sheets are available; the latter is recommended.

    a. Select a contaminant listed in Table 5.11.  How does it get into the water supply/

    b. How would you know if it were in your drinking water?  Is the state you live in or come from one of the top states that releases it?  The textbook’s website contains useful links as well as hints on how to locate the data.

 

3.  Consider This 5.31 (pg 232) – Use resources of the textbook’s website to answer these questions.

    a. Name the pros and cons of using treated sewage in agricultural practices.

    b. If the quality of the water produced from the sewage treatment process atched the quality of the water in our current drinking water system, would you accept treated sewage water as drinking water?  Comment either way.

 

Research Review

Select a topic that we are covering in class and research the topic.

 

Write a 3-4 page paper that includes the significance of this topic for society, the necessary background information that would allow an uninformed person to understand this topic, the basic chemical principle demonstrated by this topic, and predictions and/or recommendations for the future.  The following is a quick list of potential topics: urban air pollution, chemistry of climate change, benefits and risks of nuclear energy, acid rain, indoor air pollution, ozone depletion, groundwater contamination, desalination.  Please feel free to choose from this list or, as we progress through the course, to find a topic that you would like to learn more about.  You will be posting the topic of your paper in our conferences during Week 3, the references for your paper during Week 4 and the Introduction to your paper during Week 5.  More information on deadlines, the resources available for you to use, proper formatting, and a grading rubric can be found in the Course Contents section.

 

Optional – I will be very happy to look at a draft of your research review.  Submit your draft in the Workbook section of our classroom, prior to Friday, Sep 20th and I will have it back to you by Monday, Sep 23rd.  Sorry, but I cannot accept rough drafts after Sep 20th.  I highly encourage you to submit a rough draft.  In my experience, it always raises a student’s final grade.

 

The Research Project is due Sep 27
th
.