Chemistry- Chapter 7& 8
Which of the following statements correctly describe bond energy? Select all that apply.
-Bond energy is the energy required to break a covalent bond. -Bond energy is equal in magnitude to the energy released when a bond is formed. -Bond energy is a measure of bond strength.
Which of the following options correctly describe the structure shown? Select all that apply.
-C1 will have a tetrahedral geometry. -The bond angles around C2 are approximately equal to 180°. -C2 will have a linear geometry.
Which of the following options correctly describe the structure shown? Select all that apply.
-Carbon will have a tetrahedral geometry. -The bond angles around nitrogen are a little less than 109.5°.
The bonding of chlorine with each of the Period 3 elements shows a change in bonding type from ionic through polar covalent to nonpolar covalent. Select the properties that reflect this change in bonding character.
-Electrical conductivity at the melting point is high only for chlorides of Group 1A(1) and Group 2A(2). -There is a general decrease in ΔEN moving from left to right across the period. -Electron density relief maps show a steady increase in electron sharing from NaCl to Cl2.
Which of the following statements correctly describe a polar covalent bond? Select all that apply.
-In a polar covalent bond the electron density is highest over the more electronegative atom. -A bond between atoms whose electronegativities differ by more than 0.4 but less than 1.7 is polar.
Which of the following statements describe/define ionization energy correctly? Select all that apply.
-Ionization energy is the energy required for the complete removal of 1 mol of electrons from 1 mol of gaseous atoms or ions. -The ionization energy of an element is a measure of how easily it forms a cation.
Which of the following options describe how to draw the Lewis electron-dot symbol for a given element? Select all that apply.
-The Lewis symbol includes only the valence electrons for the element. -One dot is placed on each side of the element symbol before pairing any dots. -The A-group number of the element gives the number of valence electrons.
Which of the following statements correctly describe electron affinity? Select all that apply.
-The electron affinity is the energy change for the addition of 1 mol of electrons to 1 mol of gaseous atoms or ions. -Electron affinity measures the tendency of an element to form an anion. -The overall trend in electron affinities is to increase from left to right across a period.
Which of the following statements correctly describe how formal charge is assigned to an atom in a Lewis structure? Select all that apply.
-The number of shared electrons equals twice the number of bonds in the structure. -Formal charge = (valence e-) - (unshared e- + 1212shared e-) -The atom is considered to own half the shared electrons.
Which of the following statements correctly describe how to determine molecular shape using the VSEPR model? Select all that apply.
-The total number of shared and unshared electron pairs around the central atom gives the electron-group arrangement. -Use the molecular formula to draw the Lewis structure.
Which of the following is the correct condensed electron configuration for selenium (Z = 34)?
[Ar] 4s23d104p4
Elements that are in the same _____ of the periodic table will have the same _____ electron configuration and will have very similar chemical _____.
group; outer, valence; properties
