Test tasks

 

 

 

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
B. nonpolar covalent
C. metallic
D. polar covalent
4. Which of the following atoms is likely to form a metallic bond?
A. carbon
B. copper
C. fluorine
D. sulfur
5. 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
6. 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
7. 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.
8. Which factor is used to determine if a bond is considered ionic?
A. Size
B. Electronegativity
C. Charge
D. Number of atoms bond
9. Why do atoms share electrons in covalent bonds?
A. to become more polar
B. to increase their atomic numbers
C. to become ions and attract each other
D. to attain a noble-gas electron configuration
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. Which characteristic is a property of molecular substances?
A. low melting point
B. good heat conductivity
C. high melting point
D. good electrical conductivity
12. 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
13. 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.
14. Which of the following would be a polar molecule?
A. CO2
B. H2S
C. CH4
D. SF6
E. BeF2
15. What is the bond order of NO?
A. 1/2
B. 1
C. 3/2
D. 3
E. 5/2
16. According to the VSEPR model, the H - P - H bond angle in PH3 is
A. 120º
B. 109.5º
C. 90º
D. a little less than 120º
E. a little less than 109.5º
17. Which of the following molecular geometries does the XeF5+ cation exhibit?
A. Tetradral
B. T-shaped
C. Octahedral
D. square pyramidal
E. trigonal bipyramidal
18. 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. highly mobile electrons in the valence shell
19. … is the electrostatic force of attraction that two neighbouring nuclei have for a localised pair of electrons shared between them.
A. Covalent bond
B. Ionic bond
C. Metallic bond
D. Chemical bond
E. Molecular structure
20. Which of the following molecules is most polar?
A. C2H2
B. H2O
C. BF3
E. CO2