Chapter 10 chem

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.

true

When you have 4 electron groups, the electron geometry is tetrahedral.

true

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

D) 180°

How many valence electrons are in the nitrate ion? A) 18 B) 22 C) 23 D) 24 E) 26

D) 24

The total number of electrons to be counted for the Lewis structure of the PO4^3- polyatomic ion is: A) 8. B) 26. C) 29. D) 32. E) none of the above

D) 32.

How many bonding electrons are in the Lewis structure of N2? A) 2 B) 3 C) 4 D) 6 E) none of the above

D) 6

How many bonding electrons are in the Lewis structure of carbon monoxide, CO? A) 2 B) 3 C) 4 D) 6 E) none of the above

D) 6

Carbon monoxide contains resonance Lewis structures.

false

Boron forms compounds that violate the octet rule.

true

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

false

Li : is the proper Lewis structure (dot structure) for lithium.

false

The Lewis structure for O2 contains a triple bond.

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°.

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 electrons.

false

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

false

The structure is a proper representation of the bonding in the :H=H: 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

Water and oil do not mix because water molecules are nonpolar and molecules that compose oil are generally polar.

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 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.

false

Chlorine has 8 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 an octet.

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

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

true

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

true

The VSEPR theory predicts that the angle between the central carbon atom and the two oxygen atoms in CO2 measures 180°.

true

The correct Lewis structure for CO2 shows that the molecule contains two double bonds.

true

The correct Lewis structure for potassium in KCl is K+

true

The double bond is shorter and stronger than a single bond.

true

The Lewis model predicts that the formula for a compound between barium and sulfur is: A) BaS B) Ba2S C) BaS2 D) BaS3 E) none of the above

A) BaS

Which compound below is a polar molecule AND has a linear molecular geometry? A) CO B) CO2 C) CH4 D) H2O E) none of the above

A) CO

Which compound listed below will dissolve in NH3? A) H2S B) CO2 C) O2 D) all of the compounds E) none of the compounds

A) H2S

Consider the Lewis structures for the compound SO3 and the polyatomic ions SO32- and SO42-. Which of these must exist as a set of resonance structures? A) SO3 only B) SO32- only C) SO42- only D) all of these show resonance E) none of these show resonance

A) SO3 only

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

A) bent

What is the molecular geometry of SCl2? A) bent B) linear C) tetrahedral D) trigonal pyramidal E) not enough information

A) bent

What is the molecular geometry of ozone, O3? A) bent B) linear C) tetrahedral D) trigonal pyramidal E) not enough information

A) bent

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? A) ionic B) pure covalent C) polar covalent D) not enough information E) none of the above

A) ionic

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

A) linear

Which sequence below represents the proper order of increasing bond strength? A) single < double < triple B) double < single < triple C) single < triple < double D) triple < double < single E) none of the above

A) single < double < triple

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.

A) upper right-side of the periodic table.

Which of the following compounds would have a linear molecular geometry? 1. N2 2. H2S 3. CO2 A) 1 and 2 only B) 1 and 3 only C) 2 and 3 only D) 1, 2 and 3 E) neither 1, 2,or 3

B) 1 and 3 only

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

B) 109.5°

Which compound listed below will dissolve in carbon tetrachloride, CCl4? A) NaCl B) CS2 C) NH3 D) all of the compounds E) none of the compounds

B) CS2

Which of the following statements is TRUE for the covalent molecule HCl? A) Chlorine is more electronegative and the shared electron pair is likely to be found on the hydrogen atom. B) Chlorine is more electronegative and the shared electron pair is likely to be found on the chlorine atom. C) Hydrogen is more electronegative and the shared electron pair is likely to be found on the hydrogen atom. D) Hydrogen is more electronegative and the shared electron pair is likely to be found on the chlorine atom. E) none of the above

B) Chlorine is more electronegative and the shared electron pair is likely to be found on the chlorine atom.

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

B) Cl2O

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

B) H2O

Which one of the following molecules is NOT capable of having resonance structures? A) SeO2 B) H2O C) SO2 D) O3 E) none of the above

B) H2O

The Lewis model predicts that the formula for a compound between potassium and sulfur is: A) KS B) K2S C) KS2 D) K3S E) none of the above

B) K2S

Which Lewis structure below correctly represents KCl? A) K⁺ [..]⁻ Cl .. B) K⁺ [: :]⁻ .. Cl .. C) K : : .. Cl .. D) : : : : .. .. K Cl .. .. E) none of the above

B) K⁺ [: :]⁻ .. Cl ..

Which term matches the definition: A separation of charge within a bond? A) coulombic attraction B) dipole moment C) pure covalent D) nonpolar covalent E) electronegativity

B) dipole moment

What is the molecular geometry of carbon dioxide, ? A) bent B) linear C) tetrahedral D) trigonal pyramidal E) not enough information

B) linear

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

B) trigonal planar

The central atom in the chlorite anion, ClO2- is surrounded by: A) one bonding and three unshared pairs of electrons. B) two bonding and two unshared pairs of electrons. C) two bonding and one unshared pair of electrons. D) two double bonds and no unshared pairs of electrons. E) none of the above

B) two bonding and two unshared pairs of electrons.

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

C) 120°

The Lewis structure for carbon monoxide is :C=O: This structures shows: A) 4 lone pairs and 1 bonding pair. B) 4 lone pairs and 3 bonding pairs. C) 2 lone pairs and 3 bonding pairs. D) 2 lone pairs and 1 bonding pair. E) none of the above

C) 2 lone pairs and 3 bonding pairs.

Which of the following statements about the water molecule is TRUE? A) A water molecule has two dipole moments and they cancel each other. B) A water molecule is symmetrical and therefore is nonpolar. C) A water molecule is asymmetric and therefore is polar. D) The electronegativities of hydrogen and oxygen are equal and therefore a water molecule is nonpolar. E) none of the above

C) A water molecule is asymmetric and therefore is polar.

The Lewis model predicts that the formula of a compound formed between bromine and aluminum is: A) AlBr B) Al2Br C) AlBr3 D) AlBr2 E) none of the above

C) AlBr3

The Lewis model predicts that the formula for a compound between fluorine and calcium is: A) CaF B) Ca2F C) CaF2 D) CaF3 E) none of the above

C) CaF2

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

C) H2

Which compound listed below will dissolve in water? A) CCl4 B) SiO2 C) NH3 D) all of the compounds E) none of the compounds

C) NH3

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? A) NO is an ionic compound. B) NO is a pure covalent compound. C) NO is a polar covalent compound. D) There is not enough enough information to determine the nature of NO. E) None of the above statements is true.

C) NO is a polar covalent compound.

How does soap work? A) Soap works by breaking grease molecules into smaller molecules that dissolve in water. B) Soap works by making water into a nonpolar liquid which grease can dissolve in. C) Soap works by having a polar end and a nonpolar end which allows the water and oil to interact indirectly. D) Soap works by having a polar end which attaches to the grease molecule and polarizes it and turns the grease molecule into another soap molecule. This is a chain reaction. E) none of the above

C) Soap works by having a polar end and a nonpolar end which allows the water and oil to interact indirectly.

How many lone electron pairs does the ClO (-1 charged) polyatomic anion have? A) one B) three C) six D) two E) none of the above

C) six

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

C) 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

C) tetrahedral

What is the molecular geometry of CCl4? A) bent B) linear C) tetrahedral D) trigonal pyramidal E) not enough information

C) tetrahedral

What is the molecular geometry of NH4+? A) bent B) linear C) tetrahedral D) trigonal pyramidal E) not enough information

C) tetrahedral

What is the molecular geometry of SiH4? A) bent B) linear C) tetrahedral D) trigonal pyramidal E) not enough information

C) tetrahedral

The electron geometry and the molecular geometry of ammonia (NH3) are, respectively: A) trigonal planar, bent. B) tetrahedral, tetrahedral. C) tetrahedral, trigonal pyramidal. D) tetrahedral, bent. E) none of the above

C) tetrahedral, trigonal pyramidal.

The central atom in the chlorate anion, ClO3- is surrounded by: A) two bonding and two unshared pairs of electrons. B) one bonding and three unshared pairs of electrons. C) three bonding and one unshared pair of electrons. D) two double bonds and no unshared pairs of electrons. E) none of the above.

C) three bonding and one unshared pair of electrons.

Which symbol should be used between two structures that represent resonance structures? A) → B) ← C) ↔ D) ≡ E) none of the above

C) ↔

Which of the following statements are TRUE about the BF3 molecule? A) BF3 has a trigonal planar molecular geometry. B) BF3 violates the octet rule for the central atom. C) BF3 is nonpolar. D) All of the above statements are true. E) None of the above are true.

D) All of the above statements are true.

Which of the following compounds have resonance structures? A) CH4 B) H2O C) NH3 D) O3 E) None of the compounds have resonance structures.

D) O3

Which of the following has a tetrahedral electron geometry and a trigonal pyramidal molecular geometry? A) Br2O B) GeH4 C) SO2 D) PF3 E) none of the above

D) PF3

When a nonmetal bonds with a nonmetal: A) a molecular compound forms. B) a covalent bond is involved. C) electrons are shared. D) all of the above are true E) none of the above

D) all of the above are true

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

D) all of the compounds

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

D) all of the compounds

The correct Lewis structure for BF3 would have exactly: A) 1 double bond. B) 2 double bonds. C) 1 triple bond. D) no double bonds. E) none of the above

D) no double bonds.

When a molecule has four electron groups with none of them lone pairs, the molecular geometry will be: A) linear B) bent C) trigonal pyramidal D) tetrahedral E) none of the above

D) tetrahedral

The electron geometry and the molecular geometry of water are, respectively: A) trigonal planar, bent. B) tetrahedral, tetrahedral. C) tetrahedral, trigonal pyramidal. D) tetrahedral, bent. E) none of the above

D) tetrahedral, bent.

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

D) trigonal pyramidal

What is the molecular geometry of PH3? A) bent B) linear C) tetrahedral D) trigonal pyramidal E) not enough information

D) trigonal pyramidal

Which of the following statements about Lewis structures is FALSE? A) An octet is when an atom has 8 valence electrons. B) A duet is a stable electron configuration for helium. C) An ionic bond occurs when electrons are transferred. D) A covalent bond occurs when electrons are shared. E) All of the above statements are true.

E) All of the above statements are true.

Consider the following electronegativity values: H=2.1, Cl=3.0, F=4.0 Which molecule below would you expect to have the more polar bond? A) H2 B) Cl2 C) F2 D) HCl E) HF

E) HF

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 of the above

E) all of the above

Which molecule below would have a Lewis structure that is an exception to the octet rule? A) BH3 B) NO C) SI6 D) PF5 E) all of these

E) all of these

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

E) electronegativity

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

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

true