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