Chem Final Ch 10

Which term matches the definition: The ability of an element to attract electrons within a covalent bond? A) coulombic attraction B) dipole moment C) polar covalent D) nonpolar covalent E) electronegativity

electronegativity

What is the electron geometry if you have 2 electron groups around the center atom? A) linear B) trigonal planar C) tetrahedral D) trigonal bipyramidal E) not enough information

linear

the correct lewis structure for CO2 shows that the molecule contains two double bonds

true

What is the angle between electron groups in the tetrahedral geometry? A) 90° B) 109.5° C) 120° D) 180° E) not enough information

109.5

What is the angle between electron groups in the trigonal planar electron geometry? A) 90° B) 109.5° C) 120° D) 180° E) not enough information

120

What is the angle between electron groups in the trigonal planar electron geometry? A) 90° B) 109.5° C) 120° D) 180° E) not enough information

180

According to Lewis structure what is the nature of the bond in Cl2, O2,

Cl -Cl single 7+7 valence electrons =14 O=O double 6+6 = 12 N= N triple 5+5 =10

Which substance listed below is a polar molecule? A) NH4+ B) Cl2O C) SiCl4 D) all of the compounds E) none of the compounds

Cl2O

Which molecule listed below has a nonpolar covalent bond? A) NaCl B) H2O C) H2 D) all of the compounds E) none of the compounds

H2

Which molecule listed below has a polar covalent bond? A) NaCl B) H2O C) H2 D) all of the compounds E) none of the compounds

H2O

Bonding theories are used to predict how atoms bond together to form molecules.

True

Which of the following is considered a single electron group? A) a lone pair of electrons B) a single bond C) a double bond D) a triple bond E) all the above

all of the above

Which molecule listed below is a polar molecule? A) NH3 B) H2O C) HCN D) all of the compounds E) none of the compounds

all of the compounds

Which molecule listed below is a nonpolar molecule? A) CCl4 B) CO2 C) BH3 D) all the compounds E) none of the compounds

all the compounds

What is the molecular geometry if you have a double bond, a single bond and 1 lone pair around the central atom? Double bond - 1 electron group Single bond - 1 electron group 1 lone pair - 1 electron group 3 electron groups - Electron pair geometry- trigonal planar Molecular geometry - just look at highlighted part As molecular geometry considers only bonded atoms A) bent B) linear C) tetrahedral D) trigonal pyramidal E) not enough information

bent

Li: is the proper Lewis dot structure for lithium

false

The Lewis structure of oxygen should have 8 valence electrons

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 degrees

false

When you have 4 electron groups and 1 of them is a lone pair, the molecular geometry is bent.

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

false

carbon monoxide contains resonance lewis structures

false

it is important to identify lone pairs around a central atom because they do not repel other electron groups

false

the ammonium ion contains 10 valence electrons

false

the compound H2S contains polar bonds but the molecule is nonpolar

false

the correct lewis structure for CO2 shows that the carbon atom has two sets of lone pair of electrons

false

the electron geometry of a molecule is never the same as its molecular geometry

false

the lewis structure for )2 contains a tripple 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

false

the triple bond present in diatomic nitrogen N2 is what makes this molecule so reactive

false

when calculating the number of electrons for the lewis structure of a polyatomic ion subtract one electron for each negative charge

false

when you have 4 electron groups and none of them are lone pairs the molecular geometry is trigonal pyramidal

false

What is the electron geometry if you have 4 electron groups around the center atom? A) linear B) trigonal planar C) tetrahedral D) trigonal bipyramidal E) not enough information

tetrahedral

What is the molecular geometry if you have 4 single bonds around the central atom? A) bent B) linear C) tetrahedral D) trigonal pyramidal E) not enough information

tetrahedral

What is the electron geometry if you have 3 electron groups around the center atom? A) linear B) trigonal planar C) tetrahedral D) trigonal bipyramidal E) not enough information

trigonal planar

What is the molecular geometry if you have 3 single bonds and 1 lone pair around the central atom? A) bent B) linear C) tetrahedral D) trigonal pyramidal E) not enough information

trigonal pyramidal

Boron forms compounds that violate the octet rule.

true

Chlorine has eight valence electrons in the Lewis structure for KCL

true

Drugs to fight HIV have been developed using bonding theory models

true

Having eight valence electrons is very stable and is called and actet

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

true

The Lewis theory predicts that the formula for a compound made of sodium and flourine is NaF

true

The correct Lewis structure for potassium in KCL is K+

true

When you have 2 electron groups and one are lone pairs the molecular geometry is linear

true

resonance structures are the best representation we can draw but do not accurately reflect the true structure

true

the VSEPR theory predicts that the angle between the central carbon atom and the two oxygen atoms in CO2 measure 180 degrees

true

the double bond is shorter and stronger than a single bond

true

the lewis structure of water has two sets of lone pair electrons

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 4 electron groups the electron geometry is tetrahedral

true

The elements with the highest electronegativity values tend to be found in the: A) upper right-side of the periodic table. B) lower right-side of the periodic table. C) upper left side of the periodic table. D) lower left-side of the periodic table. E) center of the periodic table.

upper right-side of the periodic table

Water and oil do not mix because

water is polar and oil is nonpolar