Test on Metallic and Chemical Bonding

Class #: ____________ Name: _______________________________________ I. Encircle the letter of your choice. 1. Which of the following describes a covalent bond? a. an electrostatic attraction between ions b. an electrostatic attraction between two atoms due to the sharing of electrons c. an electrostatic attraction between two atoms due to the transfer of electrons d. an electrostatic attraction between atoms where electrons are donated by one of the atoms 2. What are the electrons that participate in chemical bonding? a. Kernel electrons b. valence electrons c. unstable inner electrons d. electrons in fully occupied orbitals 3. What is the type of bonding whose products conducts electricity in the solid state? a. Ionic c. metallic b. nonpolar covalent d. polar covalent 4. Which characteristic is a property of molecular substances? a. low melting point c. high melting point b. good heat conductivity d. good electrical conductivity 5. Which of the following atoms is likely to form a metallic bond? a. carbon b. copper c. fluorine d. sulfur 6. Which pair of elements is most likely to form a covalent compound if allowed to react together? a. barium and oxygen b. sodium and barium c. sodium and chlorine d. nitrogen and oxygen 7. Which of the following matches together to form an ionic bond? a. one that has low ionization energy and another that has low electron affinity b. one that has low ionization energy and another that has high electron affinity c. one that has high ionization energy and another that has low electron affinity d. one that has high ionization energy and another that has high electron affinity 8. Which of the following is a property of an ionic compound? a. It is soft and waxy. b. It has a low melting point. c. It conducts electricity in the solid state. d. It conducts electricity when dissolved in water. 9. Which factor is used to determine if a bond is considered ionic? a. Size c. Charge b. Electronegativity d. Number of atoms bound 10. Which one of the following is NOT true about metallic bonding? a. It gives rise to excellent electrical conductivity. b. Electrons are free to move throughout the structure c. The strength of metallic bonds increases down a group. d. The strength of metallic bonding affects the boiling point of metals. 11. Why do atoms share electrons in covalent bonds? a. to become more polar

Year and Section: _______________ Date: ________________________ b. to increase their atomic numbers c. to become ions and attract each other d. to attain a noble-gas electron configuration

12. What do metal atoms have that causes conductivity in a metal? a. high electronegativity b. high ionization energy c. highly mobile protons in the nucleus d. d. highly mobile electrons in the valence shell 13. How does calcium obey the octet rule when reacting to form compounds? a. It gains electrons. b. It gives up electrons. c. Calcium does not obey the octet rule. d. It does not change its number of electrons. 14. A scientist is interested in the study of atmosphere. He finds out that the most abundant gases are diatomic like nitrogen. He wanted to know the other gases that are also diatomic because he wanted to sort their varied characteristics. However, his scope of study is limited only to the ones that are joined by a single covalent bond. If you are his colleague, what can you suggest him to focus at so that he can easily spot the gases he needs for his research? a. halogens only b. hydrogen and the halogens only c. halogens and members of the oxygen group only d. hydrogen, halogens, and members of the oxygen group 15. You draw the Lewis structure of NO3− ion while your co-worker is also doing the same. You find out that both your illustrations are right. How would you explain this? a. NO3− ion has 3 resonance structures. b. NO3− ion has 4 resonance structures. c. NO3− ion is an exemption to the octet rule. d. NO3− ion is not a compound so different Lewis structures may fit. 16. A chemist performs the same tests on two white crystalline solids, A and B. The results are shown in the table below. SOLID A SOLID B MELTING 801 95 POINT (⁰C) SOLUBILITY IN high low H2O ELECTRICAL Good Nonconductor CONDUCTIVIT Y WHEN MELTED What do the results of these tests suggest? a. Both solids contain ionic bonds. b. Both solids contain covalent bonds. c. Solid A contains covalent bonds and solid B contains ionic bonds. d. Solid A contains ionic bonds and solid B contains covalent bonds.

17. A chemist conducted an experiment on the melting point, boiling point and conductivity of 4 unknown substances. If you are to analyze the data, which substance is an ionic compound according to the observations and inferences he summarized in the table below?

a. A D

b. B

c. C

d.