Indicate True (T) or False (F) for each of the followingstatements: Explain why

Question

Indicate True (T) or False (F) for each of the followingstatements: Explain why if it is FALSE
(1) Polarizability is a measure of ease of response ofelectrons in an atom or molecule to a change in electric field. (2) The boiling point of a liquid is the temperature at whichthe vapor pressure of the liquid equals the pressure of the atmosphere above it. (3) Methanol (CH3OH) is more soluble in water than 1-pentanol(CH3CH2CH2CH2CH2OH) because the C5H11 unit attached to the OHin 1-pentanol is more hydrophilic than the CH3 unit in methanol. (4) The ammonia molecules has a tetrahedral shape. (5) Acetic acid is lower boiling than ethyl alcohol. (6) Hydrophobic means incompatible with water. (7) The frequency of a given stretching vibration in an IRspectrum can be related to (1) the masses of the bonded atoms, and (2) the relative stiffness ofthe bond. (8) In order for a vibration to occur with the adsorption ofIR energy, the dipole moment of the molecule must change as the vibration occurs.
(1) Polarizability is a measure of ease of response ofelectrons in an atom or molecule to a change in electric field. (2) The boiling point of a liquid is the temperature at whichthe vapor pressure of the liquid equals the pressure of the atmosphere above it. (3) Methanol (CH3OH) is more soluble in water than 1-pentanol(CH3CH2CH2CH2CH2OH) because the C5H11 unit attached to the OHin 1-pentanol is more hydrophilic than the CH3 unit in methanol. (4) The ammonia molecules has a tetrahedral shape. (5) Acetic acid is lower boiling than ethyl alcohol. (6) Hydrophobic means incompatible with water. (7) The frequency of a given stretching vibration in an IRspectrum can be related to (1) the masses of the bonded atoms, and (2) the relative stiffness ofthe bond. (8) In order for a vibration to occur with the adsorption ofIR energy, the dipole moment of the molecule must change as the vibration occurs. (1) Polarizability is a measure of ease of response ofelectrons in an atom or molecule to a change in electric field. (2) The boiling point of a liquid is the temperature at whichthe vapor pressure of the liquid equals the pressure of the atmosphere above it. (3) Methanol (CH3OH) is more soluble in water than 1-pentanol(CH3CH2CH2CH2CH2OH) because the C5H11 unit attached to the OHin 1-pentanol is more hydrophilic than the CH3 unit in methanol. (4) The ammonia molecules has a tetrahedral shape. (5) Acetic acid is lower boiling than ethyl alcohol. (6) Hydrophobic means incompatible with water. (7) The frequency of a given stretching vibration in an IRspectrum can be related to (1) the masses of the bonded atoms, and (2) the relative stiffness ofthe bond. (8) In order for a vibration to occur with the adsorption ofIR energy, the dipole moment of the molecule must change as the vibration occurs.

Explanation / Answer

(1) Polarizability is a measure of ease of response ofelectrons in an atom or molecule to a change in electric field. ( True ) (2) The boiling point of a liquid is the temperature at whichthe vapor pressure of the liquid equals the pressure of the atmosphere above it. ( True ) (3) Methanol (CH3OH) is more soluble in water than 1-pentanol(CH3CH2CH2CH2CH2OH) because the C5H11 unit attached to the OHin 1-pentanol is more hydrophilic than the CH3 unit in methanol. (true) (4) The ammonia molecules has a tetrahedral shape.(False) No. of hybrid orbitals , H = ( V+S-C+A)/2                                       = ( 5 + 3 -0+0 ) /2   V = valence of N = 5 ,S = No.of single valence atoms = 3 ,C& Aare                                                                       no.of    cations & anionsrespectively                                       = 4 which corresponds to sp3 hybridization So , the expected geometry is tetrahedral,But out of the 4corners, one corner is occupied by lone pair of electrons presenton N.So it is pyramidal in shape.               (5) Acetic acid is lower boiling than ethyl alcohol.(True)Since more hydrogen bonding is there in ethanol (6) Hydrophobic means incompatible with water.( True) (7) The frequency of a given stretching vibration in an IRspectrum can be related to (1) the masses of the bonded atoms, and (2) the relative stiffness ofthe bond. ( true ) Frequency , v = ( 1/2) (k/) Where is the reduced mass & is = mm' / ( m+ m') (8) In order for a vibration to occur with the adsorption ofIR energy, the dipole moment of the molecule must change as the vibration occurs.(True) (1) Polarizability is a measure of ease of response ofelectrons in an atom or molecule to a change in electric field. ( True ) (2) The boiling point of a liquid is the temperature at whichthe vapor pressure of the liquid equals the pressure of the atmosphere above it. ( True ) (3) Methanol (CH3OH) is more soluble in water than 1-pentanol(CH3CH2CH2CH2CH2OH) because the C5H11 unit attached to the OHin 1-pentanol is more hydrophilic than the CH3 unit in methanol. (true) (4) The ammonia molecules has a tetrahedral shape.(False) No. of hybrid orbitals , H = ( V+S-C+A)/2                                       = ( 5 + 3 -0+0 ) /2   V = valence of N = 5 ,S = No.of single valence atoms = 3 ,C& Aare                                                                       no.of    cations & anionsrespectively                                       = 4 which corresponds to sp3 hybridization So , the expected geometry is tetrahedral,But out of the 4corners, one corner is occupied by lone pair of electrons presenton N.So it is pyramidal in shape.               (5) Acetic acid is lower boiling than ethyl alcohol.(True)Since more hydrogen bonding is there in ethanol (6) Hydrophobic means incompatible with water.( True) (7) The frequency of a given stretching vibration in an IRspectrum can be related to (1) the masses of the bonded atoms, and (2) the relative stiffness ofthe bond. ( true ) Frequency , v = ( 1/2) (k/) Where is the reduced mass & is = mm' / ( m+ m') (8) In order for a vibration to occur with the adsorption ofIR energy, the dipole moment of the molecule must change as the vibration occurs.(True)

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