intro to chemistry chap 10
NO is a polar covalent compound.
The electronegativity value for N is 3.0 and that for O is 3.5. Based on these values, which of the following statements is TRUE about the compound NO?
upper right-side of the periodic table.
The elements with the highest electronegativity values tend to be found in the:
109.5°
What is the angle between electron groups in the tetrahedral geometry?
120°
What is the angle between electron groups in the trigonal planar electron geometry?
B):Br : -Br :
What is the correct Lewis structure for Br2?
[: C≡ N :]−
What is the correct Lewis structure for CN−?
D) : 0 = C= 0 :
What is the correct Lewis structure for CO2?
: N ≡ N :
What is the correct Lewis structure for N2?
0=0
What is the correct Lewis structure for O2?
H-O -H
What is the correct Lewis structure for water?
linear
What is the electron geometry if you have 2 electron groups around the center atom?
trigonal planar
What is the electron geometry if you have 3 electron groups around the center atom?
tetrahedral
What is the electron geometry if you have 4 electron groups around the center atom?
trigonal pyramidal
What is the molecular geometry if you have 3 single bonds and 1 lone pair around the central atom?
tetrahedral
What is the molecular geometry if you have 4 single bonds around the central atom?
bent
What is the molecular geometry if you have a double bond, a single bond and 1 lone pair around the central atom?
tetrahedral
What is the molecular geometry of CCl4?
tetrahedral
What is the molecular geometry of NH4 +?
trigonal pyramidal
What is the molecular geometry of PH3?
bent
What is the molecular geometry of SCl2?
tetrahedral
What is the molecular geometry of SiH4?
linear
What is the molecular geometry of carbon dioxide, ?
bent
What is the molecular geometry of ozone, O3?
tetrahedral
When a molecule has four electron groups with none of them lone pairs, the molecular geometry will be:
all of the above are true
When a nonmetal bonds with a nonmetal:
FALSE
When calculating the number of electrons for the Lewis structure of a polyatomic ion, subtract one electron for each negative charge.
TRUE
When calculating the number of electrons for the Lewis structure of a polyatomic ion, you must add one electron for each negative charge and subtract one electron for each positive charge.
TRUE
When you have 2 electron groups and none are lone pairs, the molecular geometry is linear.
FALSE
When you have 4 electron groups and 1 of them is a lone pair, the molecular geometry is bent.
FALSE
When you have 4 electron groups and none of them are lone pairs, the molecular geometry is trigonal pyramidal.
TRUE
When you have 4 electron groups, the electron geometry is tetrahedral.
K+ [: CI :]−
Which Lewis structure below correctly represents KCl?
Mg+2 [: S :]−2
Which Lewis structure below correctly represents the compound formed between magnesium and sulfur?
CO
Which compound below is a polar molecule AND has a linear molecular geometry?
H2S
Which compound listed below will dissolve in NH3?
CS2
Which compound listed below will dissolve in carbon tetrachloride, CCl4?
NH3
Which compound listed below will dissolve in water?
all of these
Which molecule below would have a Lewis structure that is an exception to the octet rule?
H2
Which molecule listed below has a nonpolar covalent bond?
H2O
Which molecule listed below has a polar covalent bond?
all of the compounds
Which molecule listed below is a nonpolar molecule?
all of the compounds
Which molecule listed below is a polar molecule?
O3
Which of the following compounds have resonance structures?
1 and 3 only
Which of the following compounds would have a linear molecular geometry? 1. N2 2. H2S 3. CO2
PF3
Which of the following has a tetrahedral electron geometry and a trigonal pyramidal molecular geometry?
all of the above
Which of the following is considered a single electron group?
All of the above statements are true.
Which of the following statements about Lewis structures is FALSE?
A water molecule is asymmetric and therefore is polar.
Which of the following statements about the water molecule is TRUE?
All of the above statements are true.
Which of the following statements are TRUE about the BF3 molecule?
Chlorine is more electronegative and the shared electron pair is likely to be found on the chlorine atom.
Which of the following statements is TRUE for the covalent molecule HCl?
H2O
Which one of the following molecules is NOT capable of having resonance structures?
single < double < triple
Which sequence below represents the proper order of increasing bond strength?
Cl2O
Which substance listed below is a polar molecule?
↔
Which symbol should be used between two structures that represent resonance structures?
dipole moment
Which term matches the definition: A separation of charge within a bond?
electronegativity
Which term matches the definition: The ability of an element to attract electrons within a covalent bond?
TRUE
The Lewis theory predicts that the formula for a compound made of sodium and fluorine is NaF.
FALSE
The Lewis theory predicts that the formula for a compound of magnesium and sulfur is MgS2.
FALSE
The VSEPR theory predicts that the H-C-H angle in CH4 measures 120°.
TRUE
The VSEPR theory predicts that the angle between the central carbon atom and the two oxygen atoms in CO2 measures 180°.
FALSE
The ammonium ion contains 10 valence electrons.
three bonding and one unshared pair of electrons.
The central atom in the chlorate anion, ClO^3- is surrounded by:
0= Se - 0 : : ↔ :0 - Se = 0
Which set shows the correct resonance structures for SeO2?
TRUE
Drugs to fight HIV have been developed using bonding theory models.
two bonding and two unshared pairs of electrons.
The central atom in the chlorite anion, ClO^2- is surrounded by:
FALSE
The compound H2S contains polar bonds but the molecule is nonpolar.
no double bonds.
The correct Lewis structure for BF3 would have exactly:
FALSE
The correct Lewis structure for CO2 shows that the carbon atom has two sets of lone pair electrons.
TRUE
The correct Lewis structure for potassium in KCl is K+.
TRUE
The correct Lewis structure for shows that the molecule contains two double bonds.
TRUE
The double bond is shorter and stronger than a single bond.
tetrahedral, trigonal pyramidal.
The electron geometry and the molecular geometry of ammonia (NH3) are, respectively:
tetrahedral, bent.
The electron geometry and the molecular geometry of water are, respectively:
FALSE
The electron geometry of a molecule is never the same as its molecular geometry.
ionic
The electronegativity value for Mg is 1.2 and the value for O is 3.5. Based on these values, what type of bond is expected for a compound formed between Mg and O?
FALSE
A chemical bond is classified as a covalent bond if it involves the transfer of electrons.
FALSE
A correct Lewis structure for an atom of carbon would have eight dots surrounding the symbol of the element.
TRUE
Bonding theories are used to predict how atoms bond together to form molecules.
TRUE
Boron forms compounds that violate the octet rule.
NO2^-
The Lewis structure, [:0 - N= 0 ] best represents:
FALSE
Carbon monoxide contains resonance Lewis structures.
TRUE
Chlorine has 8 valence electrons in the Lewis structure for KCl.
SO3 only
Consider the Lewis structures for the compound SO3 and the polyatomic ions SO3^2- and SO4^2-Which of these must exist as a set of resonance structures?
HF
Consider the following electronegativity values: H=2.1, CI=3.0,F=4.0 Which molecule below would you expect to have the more polar bond
180°
What is the angle between electron groups in the linear electron geometry?
TRUE
Having eight valence electrons is very stable and is called an octet.
2 lone pairs and 3 bonding pairs.
The Lewis structure for carbon monoxide is: C=0 : This structures shows:
Soap works by having a polar end and a nonpolar end which allows the water and oil to interact indirectly.
How does soap work?
6
How many bonding electrons are in the Lewis structure of N2?
6
How many bonding electrons are in the Lewis structure of carbon monoxide, CO?
six
How many lone electron pairs does the ClO (-1 charged) polyatomic anion have?
24
How many valence electrons are in the nitrate ion?
FALSE
It is important to identify lone pairs around a central atom because they do not repel other electron groups.
TRUE
Lewis structures only use the valence electrons in determining the bonding.
TRUE
Lewis theory predicts that the formula for a compound made of aluminum and phosphorus is AlP.
FALSE
Li : is the proper Lewis structure (dot structure) for lithium.
FALSE
The Lewis structure of oxygen should have 8 valence electrons.
TRUE
Resonance structures are the best representation we can draw but do not accurately reflect the true structure.
TRUE
The Lewis structure of water has two sets of lone pair electrons.
BaS
The Lewis model predicts that the formula for a compound between barium and sulfur is:
CaF2
The Lewis model predicts that the formula for a compound between fluorine and calcium is:
K2S
The Lewis model predicts that the formula for a compound between potassium and sulfur is:
AlBr3
The Lewis model predicts that the formula of a compound formed between bromine and aluminum is:
FALSE
The Lewis structure for O2 contains a triple bond.
FALSE
The structure : H=H : is a proper representation of the bonding in the H2 molecule.
FALSE
The sulfate ion contains 28 valence electrons.
32.
The total number of electrons to be counted for the Lewis structure of the PO4^3- polyatomic ion is
FALSE
The triple bond present in diatomic nitrogen, N2, is what makes this molecule so reactive.
FALSE
Water and oil do not mix because water molecules are nonpolar and molecules that compose oil are generally polar.
