Covalent bonding - Expert Answers

Covalent bonding - Expert Answers

1. Covalent bonding (with an electronegativity difference below 0.5) results when fluorine bonds with
A. potassium.
B. fluorine.
C. iodine.
D. hydrogen.

2. Based on silicon's position on the periodic table, it has
A. 14 electrons, which include 10 valence electrons in the second energy level and 4 electrons in the first energy level.
B. 14 electrons, which include 2 valence electrons in the third energy level and 12 electrons distributed over the first two energy 
C. 14 valence electrons distributed over three energy levels.
D. 14 electrons, which include 4 valence electrons in the third energy level and 10 electrons distributed over the first two energy 

3. What is the electronegativity difference for a bond between potassium and iodine?
A. 1.7
B. 0.4
C. 4.6
D. 3.3

4. Which of these lists the energies of the sublevels, from highest to lowest?
A. d p s f
B. f d p s
C. s p d f
D. d f s p

5. Due to shape and polarity differences, the boiling point of carbon dioxide dioxide is _______ water.
A. lower than
B. much higher than
C. slightly higher than
D. equal to
6. Which element's atomic radius changes the most in size when it becomes ionized?
A. Fluorine
B. Lithium
C. Chlorine
D. Sodium

7. All the following are signs of a chemical reaction, except
A. a change in color or odor.
B. a release of gas.
C. a change in energy.
D. a change of state.

8. Which of the following is the least reactive nonmetal?
A. I
B. Br
C. Cl
D. F

9. Which of the following is true regarding the inner transition elements?
A. They occupy the d block of the periodic table.
B. These include all elements in groups 3–12.
C. Their valence electrons can be located in both s and f sublevels.
D. These include the lanthanides and actinides and do not have f sublevels.

10. Which of the following would not increase the rate of most reactions?
A. Adding a catalyst
B. Removing an inhibitor
C. Lowering the concentration of the reactants
D. Increasing the temperature

11. Which of the following statements is not accurate in regard to the first four energy levels?
A. The fourth energy level is the only energy level to hold an f sublevel.
B. An orbital can hold a maximum of two electrons.
C. The third energy level can hold a maximum of 18 electrons.
D. The first energy level has 1 p orbital.

12. What type of reaction does the following equation represent? 

A. Double-displacement reaction
B. Single-displacement reaction
C. Combustion
D. Synthesis 

13. The number of energy levels to which an electron can jump depends on the
A. color of light only.
B. wavelength of light only.
C. amount of energy it absorbs.
D. electromagnetic spectrum.

14. Which of the following is not true of polar covalent bonds?
A. Electronegativity differences for atoms with polar covalent bonds range between 0.5 and 2.0.
B. Polar covalent bonds create two poles across the bond.
C. Polar covalent bonds result from the unequal sharing of electrons.
D. Polar covalent bonds exist between atoms of the same element.

15. Electronegativity tends to increase from left to right across a row, because
A. the shielding effect increases.
B. the attraction between the nucleus and the valence electrons increases.
C. the number of energy levels increases.
D. the valence electrons are located farther away from the nucleus.

16. Which of the following is true regarding the transition elements?
A. Most transition elements have lower melting and boiling points than the main group elements.
B. Changes in atomic radii in transition elements are greater than those in the main group elements.
C. Transition elements have predictable reactivity patterns.
D. Multiple oxidation states resulting from the involvement of d electrons in bonding is a characteristic of transition elements.

17. Which of the following are not grouped according to similar chemical properties?
A. Ruthenium, iridium, palladium
B. Cobalt, iron, nickel
C. Iron, copper, ruthenium
D. Gold, silver, copper

18. Which of these equations is balanced?

19. Which of the following is not true in regard to atomic radii of main group elements?
A. Atomic radii size is related to the number of electrons in the valence level and the number of protons in the nucleus.
B. Atomic radii generally increase as you move down a group.
C. Atomic radii generally increase as you move from left to right across a period.
D. Atomic radii decrease in size when the pull of electrons toward the nucleus of an atom is greater.

20. Which of the following elements would exhibit the greatest shielding effect?
A. Potassium
B. Sodium
C. Lithium
D. Rubidium

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