Final Exam Review 5 of Chemistry

Part A 1. Which kind of energy is stored within a chemical bond? (1) free energy (2) activation energy (3) kinetic energy (4) potential energy   2. Which particles may be gained, lost, or shared by an atom when it forms a chemical bond? (1) protons (2) electrons (3) neutrons (4) nucleons   3. The forces between atoms that create chemical bonds are the result of the interactions between (1) nuclei (2) electrons (3) protons and electrons (4) protons and nuclei   4. At STP, potassium is classified as (1) a metallic solid (2) a molecular solid (3) a network solid (4) an ionic solid 5. Which element consists of positive ions immersed in a "sea" of mobile electrons? (1) sulfur (2) nitrogen (3) calcium (4) chlorine   6. The degree of polarity of a bond is indicated by (1) ionization energy difference (2) the shape of the molecule (3) electronegativity difference (4) the charge on the kernel   7. In a nonpolar covalent bond, electrons are (1) located in a mobile "sea" shared by many ions (2) transferred from one atom to another (3) shared equally by two atoms (4) shared unequally by two atoms   8. Which type of bond is formed when an atom of potassium transfers an electron to a bromine atom? (1) metallic (2) ionic (3) nonpolar covalent (4) polar covalent   9. Which type of bonding is characteristic of a substance that has a high melting point and is a good electrical conductor only when in the liquid phase?   (1) nonpolar covalent (2) polar covalent (3) ionic (4) metallic   10. Which terms describe a substance that has a low melting point and poor electrical conductivity? (1) covalent and metallic (2) covalent and molecular (3) ionic and molecular (4) ionic and metallic   11. The unusually high boiling point of water is due to the presence of (1) hydrogen bonds (2) ionic bonds (3) network bonds (4) molecule-ion attractions 12. When two atoms form a chemical bond by sharing electrons, the resulting molecule will be   (1) polar only (2) nonpolar only (3) either polar or nonpolar (4) neither polar nor nonpolar   13. Which type of substance is soft, has a low melting point, and is a poor conductor of electricity? (1) covalent solid (2) ionic solid (3) metallic solid (4) network solid   14. Oxygen, nitrogen, and fluorine bond with hydrogen to form molecules. These molecules are attracted to each other by (1) ionic bonds (2) hydrogen bonds (3) polar covalent bonds (4) nonpolar covalent bonds   15. Which kind of compound generally results when nonmetal atoms chemically combine with metal atoms? (1) network (2) molecular (3) ionic (4) metallic   16. Which statement is true concerning the reaction N(g) + N(g) → N₂(g) + energy? (1) A bond is broken and energy is absorbed. (2) A bond is broken and energy is released. (3) A bond is formed and energy is absorbed. (4) A bond is formed and energy is released.   17. The bond between which pair of elements is the least ionic in character? (1) H-F (2) H-Cl (3) H-Br (4) H-I   18. Which compound has the greatest degree of ionic character? (1) NaCl (2) MgCl₂ (3) AlCl₃ (4) SiCl₄ 19. Look at the electron dot diagram below. H:F: The electrons in the bond between hydrogen and fluorine are more strongly attracted to the atom of (1) hydrogen, which has the higher electronegativity (2) hydrogen, which has the lower electronegativity (3) fluorine, which has the higher electronegativity (4) fluorine, which has the lower electronegativity