QUIZ 4

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1

1. A molecule that has a single covalent bond is _____.
A. CO2
B. CO
C. Cl2

C

2

2. how many valence electrons does PO43- has?
A. 29
B. 30
C. 31
D. 32

D

3

3. Which one of the following elements does not exist as a diatomic molecule in nature?
A. hydrogen
B. nitrogen
C. neon

C

4

4. Which one of these compounds is an ionic compound?
A. Na2O
B. CO2
C. N2

A

5

5. According to periodic trends, which element is the most electronegative?
A. Ne
B. O
C. F

C

6

6. What is the electron group (EG) and molecular geometry (MG) of an ammonia molecule?
A. (EG) tetrahedral and (MG) tetrahedral
B. (EG) tetrahedral and (MG) trigonal pyramidal
C. (EG) tetrahedral and (MG) bent

B

7

7. Write the formulas of the following compound: silicon dioxide

A. SiO
B. Si2O
C. SiO2

C

8

8. Based off periodic trends, which of the following has the strongest lattice energy?
A. aluminum chloride
B. calcium chloride
C. sodium chloride

A

9

9. How do the molecular geometry of the molecule IF5 and PF5 differ?
A. In IF5, there is a lone pair of electrons on iodine where as in PF5 there are no lone pairs on phosphorus. As a result, the molecular shape of IF5 is square pyramidal and PF5 is trigonal bipyramidal.
B. In PF5, there is a lone pair of electrons on phosphorus where as in IF5 there are no lone pairs on iodine. As a result, the molecular shape of PF5 is square pyramidal and IF5 is trigonal bipyramidal.
C. In IF5, there is a lone pair of electrons on iodine where as in PF5 there are no lone pairs on phosphorus. As a result, the molecular shape of IF5 is octahedral and PF5 is trigonal bipyramidal.

A

10

10. What are the bond angle formed by the central atom P and two of the equatorial fluorine’s in the molecular geometry of PF5 ? trigonal bipyramidial
A. 90°
B. 120°
C. 109.5°

B

11

11. Using VSEPR theory, predict the electron group geometry, molecular shape, and the bond angles in a molecule that contains 4 electron groups (3 bonds and 1 lone pair electrons).
A. tetrahedral, trigonal pyramidal, >109.5°
B. tetrahedral, trigonal pyramidal, <109.5°
C. tetrahedral, trigonal pyramidal, 109.5°

B

12

12. Using VSEPR theory, predict the electron group geometry, molecular shape, and the bond angles in a molecule that contains 6 electron groups (5 bonds and 1 lone pair electrons).
A. octahedral, octahedral, 90°
B. octahedral, square planar, 90°
C. octahedral, square pyramidal, 90°

C

13

13. What are the bond angle in the molecular geometry of H2O?
A. 104.5°
B. 107°
C. 109.5°

A

14

14. What are the bond angle in the molecualre geomerty of CH4?
A. 104.5°
B. 107°
C. 109.5°

C

15

15. Write the formulas of the following compound: potassium phosphide
A. KP
B. K2P
C. K3P

C

16

16. According to the octet rule, a magnesium atom has a tendency to

A. lose one electron.
B. lose two electrons.
C. gain one electron. Mg^2+

B

17

17. According to the octet rule, a bromine atom has a tendency to

A. lose one electron.
B. lose two electrons.
C. gain one electron.

C

18

18. How many electrons are shared in a single covalent bond?
A. 2
B. 3
C. 1

A

19

19. A molecule that has a triple covalent bond is _____.
A. HCN
B. CO2
C. H2O

A

20

20. Which of the following diatomic molecules is joined by a double covalent bond?
A. Cl2
B. O2
C. N2

B

21

21. What’s the molecualr shape of BCl3.
A. linear
B. bent
C. trigonal planar

C

22

22. What is the molecular shape of CO2?
A. linear
B. bent
C. trigonal planar

A

23

23. Which molecule has only covalent bonds?
A. CO2
B. Al2O3
C. Mg3N2

A

24

24. The octet rule states that main group elements in the periodic table react to achieve a filled valence shell which consists of how many electrons?
A. 2
B. 4
C. 8

C

25

25. Which of the following elements are found in the p-block and can form an octet?
A. He, P, S, As
B. P, S, O, C
C. He, Ar, Kr, Ne

B

26

26. Based off molecular polarity determined by VSEPR theory, which of the following would be insoluble in CCl4?
A. methanol CH3OH
B. octane CH3CH2CH2CH2CH2CH2CH2CH3 non polar
C. hexane CH3CH2CH2CH2CH2CH3 nonpolar

A

27

27. Based off molecular polarity determined by VSEPR theory, in which solvent would glucose be the least soluble?
A. CH3CH2OCH2CH3
B. CH3OH
C. H2O

A

28

28. Why are detergents and soaps good at cleaning up oily stains from dishes or clothing?
A. Detergents and soaps work well to clean up oily messes because they are amphiphilic in nature so they contain both hydrophilic (polar) and hydrophobic (nonpolar) ends. The hydrophobic end attaches to oils via hydrogen bonds creating micelles which leave the hydrophilic part exposed and can be washed away by water.
B. Detergents and soaps work well to clean up oily messes because they are amphiphilic in nature so they contain both hydrophilic (non-polar) and hydrophobic (polar) ends. The hydrophobic end attaches to oils via London forces creating micelles which leave the hydrophilic part exposed and can be washed away by water.
C. Detergents and soaps work well to clean up oily messes because they are amphiphilic in nature so they contain both hydrophilic (polar) and hydrophobic (nonpolar) ends. The hydrophobic end attaches to oils via London forces creating micelles which leave the hydrophilic part exposed and can be washed away by water.

C

29

29. Which of the following molecules has a voilation of octet rule?
A. NO2
B. PF5
C. BeCl2
D. all the above

D

30

30. How many non-polar bonds does CH3OH contain?
A. 2
B. 3
C. 4

B