Chemical Bonding Flashcards
Number of valence electrons in Sn
4
Number of p obritals which may participate in double and triple bonds.
3
Number of valence electrons in SO32-
26
What type of forces exist in all molecules?
London dispersion forces
How many water molecules can glucose bond with?
17
How many valence electrons are the fo C2H6
14
What is the term for electrons that are shared unequally?
polar covalent
What is the name for the weak forces of attraction between nonpolar molecules due to temporary dipoles between nonpolar molecules
van der Waals forces
Nitrogen has five valence electrons which of the following bonds are possible
a. one single and one double
b. three single
c. one triple
all
how many valnce electrons does Sb have?
5
how bonds does NO2- have
2
What is formula for ammonium ion?
NH4+
What type of bond is formed with oppositely charges particles?
ionic
Arrange Mg, Fr, O, and Si in increasing electronegativity.
Fr, Mg, Si, O
London disperion forces depend on what two factors?
molar mass and shape
Which of the following has the largest dipole?
CO2
SO2-
H2O
CCl4
CH4
H2O
What is the name for the attraction between H2O molecules?
cohesion
Which of the following only have covalent bonds
HC2H3O2
NaCl
NH4OH
Ca3(PO4)2
LiF
HC2H3O2
The distance between two bonding nuclei is determined by
balnce between repulsive forces of the nuclei and the attraction of the nuclei and the bonding electrons
How many bonds are ther in the carbonic ion (CO32-)
3
Which of the following is a dipole bond?
a. F-F
b. H-H
c. Cl-Cl
d. H-F
e. trans-dichlorethene
H - F
Whati is the correct formula for the ionic bond between Ca and I?
CaI2
Which bonding is NOT possible for carbon atom which has four valence electrons?
a. 1 single and 1 triple
b. 1 double and 1 triple
c. 4 single
d. 2 single and 1 double
e. 2 double
b. 1 double and 1 triple
During strenous exercise, why does perspiration on one’s skin for droplets?
cohesive properties of H2O
If an ionic bond is stronger than a dipole-dipole interaction, why does water dissolve an ionic compound?
a. Ions do not overcome their interatomic attraction and therefore are not soluble.
b. Ion-dipole interaction causes the ions to heat up and vibrate free of the crystal
c. Ionice bond is weakened by the ion-dipole interactions and the ionic repulsion ejects the ions from the crystal
d. Ion-dipole intereactions of several water molecules aggregate with th ionic bond and dissociate in into solution.
d. Ion-dipole intereactions of several water molecules aggregate with th ionic bond and dissociate in into solution.
Which of the following molecules can act as a hydrogen bond acceptor, but not a donor?
a. CH3NH2
b. CH3CO2H
c. H2O
d. C2H5OH
e. CH3-O-CH3
e. CH3-O-CH3
When NaCl disolves in water, what is the force of attraction between Na+ and H2O?
a. ion-dipole
b. hydrogen bonding
c. ion-ion
d. dipole-dipole
e. van der Waals
a. ion-dipole
How many polar and nonpolar bonds are present in H2CO?
1 polar and 2 nonpolar
How many valence electrons can fit within the valence shell of a hydrogen atom?
1
Which element likely forms a cation with a +2 charge?
a. Na
b. S
c. Si
d. Mg
e. Br
d. Mg
Which of the satateents is an accurate description of the structure of the ionic compound of NaCl?
a. alternating rows of Na+ and Cl- ions are present
b. each ion present is surrounded by six ions of opposite charge
c. alternating layers of Na and cl atoms are present
d. alternating layers of Na+ and Cl- ions are present
e. repeating layers of Na+ and Cl- ion are present
b. each ion present is surrounded by six ions of opposite charge
What is the name for the force holding two atoms together n a chemical bond?
a. gravitation force
b. strong nuclear force
c. weak hydrophobic force
d. weak nuclear force
e. electrostatic force
e. electrostatic force
Which of the following diatomic molecules contains the bond of greatest polarity?
a. CH4
b. BrI
c. Cl-F
d. P4
e. Te-F
e. Te-F
Why doe H2O have unusually high boiling point compared to H2S?
a. hydrogen bonding
c. wan der Waals forces
c. H2O molcules pack more closely than H2S
d. colvalent bonds are stronger in H2O
a. hydrogen bonding
What is the geometry of a molecule in which the central atom has 2 bonding electron pairs and 2 nonbonding electron pairs?
a. trigonal planar
b. trigonal pyramidal
c. linear
d. bent
e. tetrahedral
d. bent
Which of the following represents the breaking of a noncovalent interactions?
a. ionization of water
b. decomposition of hydrogen peroxide
c. hydrolysis of an ester
d. dissolving of salt crystals
e. none of above
d. dissolving of salt crystals
Which pair of elements is most likely to for an ionic compound when reacted together?
a. C and Cl
b. K and I
c. Ga and Si
d. Fe and Mg
e. H and O
b. K and I
Which of the following statements concerning coordinate covalent bonds is correct?
a. once formed, they are indistiguishable from any other covalent bond
b. they are always single bonds
c. on the the atoms involved must be a metal and the other a nonmetal
d. both atoms involved in the bond contribute equal number of electrons to the bond
a. once formed, they are indistiguishable from any other covalent bond
The greatest dipole moment within a bond is when
a. both bonding elements have high electronegativity
b. one bonding element has high electronegativity and the other has low electronegativity
c. both bonding elements have low electronegativity
d. one bonding element has high electronegativity and the other has moderate electronegativity
e. both bonding elements have moderate electronegativity
b. one bonding element has high electronegativity and the other has low electronegativity
Which of the following must occur for an atom to obtain noble gas configuration?
a. lose, gain or share an electron
b. lose or gain an electron
c. lose an electron
d. share an electron
e. share or gain an electron
a. lose, gain or share an electron
How many polar and nonpolar bonds are in hydrogen peroxide H2O2?
2 polar and 1 nonpolar
H == O – O == H
To form an octet (eight electrons in outer shell), an atom of selenium must gain or lose how many electrons?
gain 2
Which of the following is an example of a chemical reaction?
a. two solids mix to form a heterogenous mixture
b. two solids mix to form a homogenous mixture
c. one or more new compounds are formed by rearranging the atoms
d. a new element is formed by rearranging nucleons
e. a liquid undergoes a phase change and produces a solid.
c. one or more new compounds are formed by rearranging the atoms
Which of the following is incorrect description of bonding.
a. CH3OH hydrogen bonding
b. HF hydrogen bonding
c. Cl2O dipole-dipole interaction
d. HBr van dr Waals interaction
e. CH4 van der Waals interaction
d. HBr van dr Waals interaction
(hydrogen bonding)
Which element for an ion whith the reatest positive charge?
a. Mg
b. Ca
c. Al
d. Na
e. Rb
c. Al
What is the difference between dipole-dipole and ion-dipole interaction?
Dipole-dipole interaction is dipole attraction between neutral molecules and ion-dipole interaction is dipole attraction between ions
Which is a true statement about H2O as it begins to freeze?
a. hydrogen bonds break
b. number of hydrogen bonds decreases
c. covalent bond strength increases
d. molecules move closer together
e. number of hydrogen bonds increase
e. number of hydrogen bonds increase
In the process of forming sodium nitride (Na3N) from its elements, what happens to the electrons of each sodium and the electrons of each nitrogen, respectively?
one lost (for each Na) and three gained (for each N)
Which have the least number of valence electrons?
a. S2-
b. Mg2+
c. Ar+
d. Ga+
e. F-
d. Ga+
Which of the following occurs naturally as a nonpolar diatomic molecules
a. S
b. Cl
c. Ar
b. Cl
In a chemical reaction, th bonds being formed are
a. more energetic than the ones broken
b. less energetic than the ones broken
c. the same as the ones broken
d. different from the one broken
d. different from the one broken
The charge on the sulfide ion is
-2
Is the ionic formula correct for MgHCO3?
No since Mg2+, H+, CO32-
What term best describes the smalles whole number repeating ration of ions in an ionic compound?
formula unit
