CHEM 237 Review

If you spill some ethyl acetate on your hand, you should... -look at it and see if it penetrated your gloves -remove you glove and replace it with a new one.

-remove you glove and replace it with a new one.

Spectroscopy is the instrumental process by which information about molecular structure is obtained through the _____ of electromagnetic radiation. -scattering -absorption -repudiation -emission

-scattering -absorption -emission

Mary ran a sample on a TLC plate. The spot associated with the sample travelled a distance of 1.42 cm while the difference between the origin and the solvent front is 5.92 cm. Calculate the Retention factor of the sample (to two decimal places).

0.24

T or F : For the TLC Experiment: Ethyl Acetate is a non-polar solvent.

False

T or F: It is of to take off your goggles when viewing your TLC plate in the UV chamber.

False

T or F : Hot glass looks the same as cold glass.

True

Match the component with its role in Thin-Layer Chromatography: Solvent Beaker or Bottle with Solvent Silica Gel or Alumina Glass, Plastic, or Aluminum Plate

Solvent - Mobile Phase Beaker or Bottle with Solvent - TLC Chamber Silica Gel or Alumina - Stationary Phase Glass, Plastic, or Aluminum Plate - Solid Back

For the Kinetics Experiment: A reaction that has two molecules involved at the rate determining step is _____ order -0th -2nd -3rd -1st

-2nd

For the Dehydration of Cyclohexanol Experiment: Which of the following is the worst leaving group? -Cl -OH2 -Br -OH

-OH

For the Phase Transfer Catalysis Experiment: The reaction in this experiment is... -a Williamson ether synthesis -a nucleophilic substitution -an elimination reaction

-a Williamson ether synthesis -a nucleophilic substitution

Infrared spectroscopy is particularly good at detecting functional groups such as -aldehyde groups -thiol groups -ester groups -alkenes

-aldehyde groups -ester groups -alkenes

For the Phase Transfer Catalysis Experiment: the phase transfer catalyst for the reaction is... -sodium hydroxide -naphtholate anion -benzyl tri-n-butylammonium chloride -allyl bromide

-benzyl tri-n-butylammonium chloride

For the Distillation and GC Experiment: Which of the following processes occur during a distillation? -collecting the condensate -condensing a vapor -crystallizing a solid -vaporizing a liquid

-collecting the condensate -condensing a vapor -vaporizing a liquid

Which of the following are appropriate names for CH2Cl2? -2-chloromethane -dichloromethane -DCM -methylene chloride

-dichloromethane -DCM -methylene chloride

For the Dehydration of Cyclohexanol Experiment: Alcohols can... -dissolve organic compounds -act as a base -act as an acid -dissolve inorganic compounds

-dissolve organic compounds -act as a base -act as an acid -dissolve inorganic compounds

In the Molecular Modeling Experiment we will use computational chemistry methods to study the following: -estimate dipole moments -relative energies of chair conformations -calculate bond angles and lengths -bond rotation speed

-estimate dipole moments -relative energies of chair conformations -calculate bond angles and lengths

For the Kinetics Experiment: Which of the following is the rate determining step for the reaction? -deprotonation of oxygen -nucleophilic attack of the carbocation -elimination of hydrogen and the halide -formation of the carbocation

-formation of the carbocation

For the Recrystallization Experiment: As compared to pure compounds, impure compounds... -have a melting point that is higher -have a melting point that encompasses a narrower temperature range -have a boiling point that is lower -have a melting point that encompasses a wider temperature range

-have a melting point that encompasses a wider temperature range

For the Recrystallization Experiment: Which of the following is a negative aspect of the method of recrystallization? -incompatible with oils -low cost -high purity product -scalable

-incompatible with oils

Acetanilide is a(n)... -irritant -oxidant -strong base -strong acid

-irritant

What does it mean if a compound (like 1-chloro-1-phenylethane) is a lachrymator? -it is an irritant -it is easy to ignite -it will cause humans to vomit -it can cause tears to form in your eye

-it is an irritant -it can cause tears to form in your eye

For the TLC Experiment: Compounds that have the _____ affinity for the stationary phase and the _____ affinity for the mobile phase will travel the furthest. -lowest, greatest -greatest, greatest -greatest, lowest -lowest, lowest

-lowest, greatest

Which of the following are representations of organic molecules? -plastic models -computational models -Legos -skeletal structures

-plastic models -computational models -skeletal structures

Extraction is a _________ technique. -measurement -synthesis -purification -analytical

-purification

For the Distillation and GC Experiment: The _____ the number of theoretical plates, the _____ the separation of the mixture. -smaller, worse -larger, worse -larger, better -smaller, better

-smaller, worse -larger, better

If an irritant makes contact with your skin, which of the following actions should you take? -wash the area with water -disinfect your skin -alert your TA -use burn cream

-wash the area with water -alert your TA