Chem Test study 2
How many equivalent resonance forms can be drawn for SO2 without expanding octet on the sulfur atom? A. 0 B. 2 C. 3 D. 4 E. 1
2
How many resonance forms can be drawn for CO32-? A. 1 B. 2 C. 3 D. 4 E. 0
2
What is the maximum number of double bonds that a carbon atom can form? A. 4 B. 1 C. 0 D. 2 E. 3
2
The central atom in __________ does not violate the octet rule. A. SF4 B. KrF2 C. CF4 D. XeF4 E. ICI4-
CF4
Of the atoms below, __________ is the most electronegative. A. Si B. Cl C. Rb D. Ca E. S
Cl
A valid Lewis structure of _______ cannot be drawn without violating the octet rule A. NF3 B. IF3 C. PF3 D. SbF3 E. SO42-
IF3
Of the following _______ cannot accommodate more than an octet of electrons A. P B. AS C. O D. S E. I
O
A valid Lewis structure of _______ cannot be drawn without violating the octet rule A. PO43- B. SiF4 C. CF4 D. SeF4 E. NF3
SeF4
Are there exceptions to the octet rule? If yes explain and use appropriate example; if not explain and use an appropriate example
Yes the octet rule fails in situations involving covalent bonding these exceptions include molecules in which an atom has less than an octet, molecules in which an atom has more than an octet, and molecules with an add number of electrons
The electron domain geometry of _______ is tetrahedral A. CBr4 B. PH3 C. CCl2Br2 D. XeF4 E. all of the above except XeF4
all of the above except XeF4
In the nitrate ion NO2- _______ A. both bonds are single B. both bonds are double C. one bond is double and the other is single D. both bonds are the same each being stronger and shorter than a single bond but longer and weaker than a double bond E. there are 20 valence electrons
both bonds are the same each being stronger and shorter than a single bond but longer and weaker than a double bond
What does it mean to facilitate academic dishonesty?
facilitating academic dishonesty occurs when a student helps or attempts to help another student cheat
To convert from one resonance structure to another ____ A. only atoms can be moved B. electrons and atoms can both be moved C. only electrons can be moved D. neither electrons nor atoms can be moved E. electrons must be added
only electrons can be moved
Resonance structures differ by _______ A. number and placement of electrons B. number of electrons only C. placement of atoms only D. number of atoms only E. placement of electrons only
placement of electrons only
What does it mean to plagiarize someone's work?
plagiarism is presenting someone else's work as your own
What is the difference between the electron domain geometry and the molecular geometry of a molecule?
the electron domain geometry is the predicted arrangement of electron domains around a central atom the actual arrangements of atoms in a molecule us called the molecule geometry
For resonance forms of a molecule or ion _______ A. one always corresponds to the observed structure B. all the resonance structures are observed in various proportions C. the observed structure is an average of the resonance forms D. the same atoms need to be bonded to each other in all resonance forms E. there cannot be more than two resonance structures for a given species
the observed structure is an average of the resonance forms
State the Octet rule. Does it apply to ionic compounds as well as covalent compounds? If yes explain and use an appropriate example; if not explain and use an appropriate example
the octet rule states that atoms will gain, lose, or share electrons until they are surrounded by eight valence electrons to form a molecule. yes it applies to ions in an ionic compound the cation has lost electrons and the anion has gained electrons for example in MgCl2, Mg loses 2 electrons to become Mg+2 and each Cl atom gains 1 electron to form Cl -1 which forms Mg+2Cl2-2
According to VSEPR theory if there are five electron domains in the valence shell of an atom they will be arranged in an _______ geometry A. octahedral B. linear C. tetrahedral D. trigonal planar E. trigonal bipyramidal
trigonal bipyramidal
According to VSEPR theory if there are three electron domains in the valence shell of an atom they will be arranged in an _______ geometry A. octahedral B. linear C. tetrahedral D. trigonal planar E. trigonal bipyramidal
trigonal planar
