09-17 - 9/17/2010 Choose the correct order with respect to...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 9/17/2010 Choose the correct order with respect to increasing boiling points of the following compounds. Choose Choose the correct order with respect to increasing boiling points of the following compounds. A. A. B. C. van der Waals D. E. F. hydrogen bonding dipole-dipole van der Waals van dipole-dipole van der Waals A. A. B. C. D. E. F. Choose the correct order with respect to increasing boiling points of the following compounds. Is there a model for the behavior of molecules in water? van der Waals bp = -42˚ hydrogen hydrogen bonding bp = -23˚ dipole-dipole dipole-dipole bp = +80˚ Choose the correct order of increasing solubility in water for the above compounds. A. A. B. C. A. B. C. D. E. F. D. E. F. Is there a model for the behavior of molecules in water? Why is methanol soluble in water? H O H H O H H H H O H H H O H O H H O H H H H O H H H O H O H H O H H O H H O H H O H H H H O H H H O H O H H O H H H H O O H H O H H O H H O H O H O H H O H H O H H O H O H O H H H H O H O H H O H CH3 H O H O H O H O H H O H H O H H O H O H H O H O H H 1 9/17/2010 Why are hydrocarbons insoluble in water? Quiz H O H H O H H H H O H H H O H O H H O H H H CH3 O H H O H H O H Which of the following compounds has the higher boiling point? H O H O H O H H H H O H O H H O H H3C CH3 H O O C A OH H O H O H H O H O H CH3 O OH B H Parts of molecules that can form hydrogen bonds with water will be soluble (hydrophilic). Parts of molecules that cannot form hydrogen bonds to water will not be soluble (hydrophobic). Which of the following molecules will be more soluble in water? Which of the following compounds will be more soluble in water? H3C O C OH H3C O C A OH O OH B O CH3 CH3 OH Which of the following molecules will be more soluble in water? Which of the following molecules will be more soluble in water? O O H CH3 solid H3C H H O O C H O H H O H Hydrogen bonding of the CO2H is the same for both. H H O H H O O CH3 H O H O H H O H H O O H O O H O H H H O O H H H H H H O CH3 H O H O H H O H H H O O H H H H O O O H H H Is this process (A) an increase or (B) a decrease in entropy? ΔG˚ = ΔH˚ -TΔS˚ H water solution H 2 9/17/2010 Choose the order that has the following compounds arranged correctly with respect to increasing solubility in water? O CH3 O CH3 O CH3 1 A 2 3 B 1 3 2 C 2 H O H O O O H H H O H H O CH3 1 O Na 2 Na OH O O 1 H 3 H H O H O O H H H O H H Na O O H H O H H 3 D 2 3 1 O H H increasing solubility increasing solubility increasing solubility increasing solubility Cyclooxygenase converts arachadonic acid into the prostaglandins, very active compounds responsible for many biological activities including inflamation. cyclooxygenase (an enzyme) Which amino acid residue would be predicted to be present in prostaglandin synthetase that would adjacent to the carboxyl group? cyclooxygenase (an enzyme) Non steroidal anti inflammatory drugs inhibit this enzyme. What is an example of an NSAID? A. aspirin B. morphine C. caffeine D. lidocaine 15 O H N H H O O NH O O O H N H H N H NH N H NH NH A arginine B aspartic acid C phenyl alanine D lysine 16 Which amino acid residue would be predicted to be present in prostaglandin synthetase that would adjacent to the carboxyl group? cyclooxygenase (an enzyme) Which amino acid residue would be predicted to be present in prostaglandin synthetase that would adjacent to the side chain? O H N H H O O NH O O O H N H H O H N H H O O NH O O O N H NH N H NH NH N H NH N H NH NH A arginine B aspartic acid C phenyl alanine D lysine 17 A arginine B aspartic acid C phenyl alanine D lysine O NH N H H N H N H H H N H H cyclooxygenase (an enzyme) 18 3 9/17/2010 Which amino acid residue would be predicted to be present in prostaglandin synthetase that would adjacent to the side chain? The interaction of light with matter. electromagnetic radiation + cyclooxygenase (an enzyme) H O H N H H NH O O O NH NH O N H NH N H O A arginine B aspartic acid C phenyl alanine D lysine Choose the correct statement about light. electromagnetic radiation + - visible light A. Blue light has more energy and a longer wave length than red. B. Blue light has more energy and a shorter wave length than red. C. Blue light has less energy and a shorter wave length than red. D. Blue light has less energy and a longer wave length than red. The interaction of light (energy) with molecules. wave length (λ) + - 1 frequency (λ in cm) = υ = — ¯ λ low energy long wavelength high energy short wavelength O NH N H H N H N H H H N H - visible light 19 The interaction of light with matter. electromagnetic radiation + wave length (λ) - 1 frequency (λ in cm) = υ = — ¯ λ low energy high energy short wavelength visible light long wavelength Choose the statement that best describes why the sweater on the right absorbs blue light and causing the sweater to appear red. A. The atoms in bonds of the red dye absorb light energy by vibrating at a faster rate. visible visible light O N N S O O O O S re d y e # 4 0 r e d dye #40 O B. The electrons in the red dye absorb light energy by being transferred into high energy anti bonding orbitals. C. The molecules of the red dye absorb light energy by rotating faster. D. The molecules the red dye absorb light energy by moving faster. 4 9/17/2010 electronic spectroscopy (color) O N N S O O O O electronic spectroscopy (color) O N N S O O O O N N S O O antibonding molecular orbital O S red dye #40 O S red dye #40 O blue light O O S re d dye #40 O O N N S O O O O * Orbital Energy bonding molecular orbital S red dye #40 O 26 Choose the statement that best describes why the sweater on the right absorbs blue light and causing the sweater to appear red. A. The atoms in bonds of the red dye absorb light energy by vibrating at a faster rate. Choose the statement that best describes why the Choose sweater on the right absorbs blue light and causing the sweater to appear red. A. The atoms in bonds of the red dye absorb light energy by vibrating at a faster rate. visible light visible visible light B. The electrons in the red dye absorb light energy by being transferred into high energy anti bonding orbitals. C. The molecules of the red dye absorb light energy by rotating faster. D. The molecules the red dye absorb light energy by moving faster. Infrared Spectroscopy A. The atoms in bonds of the red dye absorb light energy by vibrating at a faster rate. A model for a chemical bond (A─B). Morse Curve. quantized vibrational states visible light energy υ=1 υ=0 bond length A─B rAB A──────B A B 30 5 9/17/2010 The interaction of light with molecules. Infrared Spectroscopy. The energy required to excite a vibration depends upon the strength of the bond and the mass of the atoms. quantized vibrational states vibrational continuum quantized vibrational states energy υ=1 υ=0 rAB hυ energy υ=1 infrared energy source υ=0 rAB hυ υ=0= The energy required to excite a vibration depends upon the strength of the bond and the mass of the atoms. Given that a C=C bond stretch occurs at 1640 cm-1, select the value that you would predict for a CΞC. A. 940 cm-1. B. 1062 cm-1. C. 1405 cm-1. D. 2115 cm-1. energy 1 frequency (λ in cm) = υ = — ¯ λ wave length (λ) 33 34 6 ...
View Full Document

Ask a homework question - tutors are online