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Chemistry II - Electronegativity, Hybridization, and Chromatography

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Section 1

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T/F Reverse phase is the opposite of TLC

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Mar 1, 2020

Cards (17)

Section 1

(17 cards)

T/F Reverse phase is the opposite of TLC

Front

T

Back

T/F A pi bond CAN exist independently of a sigma bond.

Front

F These CANNOT exist without each other. It is important to remember that a double bond consists of one pi bond and one sigma bond.

Back

What is the most fundamental extraction/solubility rule?

Front

Like will dissolve like

Back

Injected compounds in gas chromatography must have what property?

Front

They must be volatile

Back

Each magnetic quantum number (ml) describes the orbitals within a subshell. Each can hold exactly two electrons that have magnetic spins of what? What describes these?

Front

They can have overall magnetic spins of (+1/2) or (-1/2)

Back

T/F In distillation, a high temperature can be used to more efficiently separate compounds.

Front

F This cannot occur because the compounds will degrade and the higher boiling point compound needs to stay in the solvent. A vacuum distiller can be used to lower the boiling point if needed.

Back

How do anti or bonding molecular orbitals occur?

Front

These are obtained by adding or subtracting the wave functions of molecular orbitals. Anti is when destructive interference occurs and bonding is when constrictive interference occurs.

Back

T/F In size-exclusion chromatography, LARGER proteins will move more quickly through the mobile phase.

Front

T

Back

How does the solvent creep up the TLC plate?

Front

Capillary action

Back

Will 2-hydroxybutanal or butane have a higher Rf value on a traditional TLC plate?

Front

The LESS polar substance that is less attached to the stationary phase (the silica gel) will have a higher value as it moves up the plate, so the butane will have a higher Rf value.

Back

How much s character does methane have?

Front

Since the carbon in the center is sp³ hybridized, it is 25% s character and 75% p character.

Back

How should a solvent for recrystallization be chosen?

Front

The product should ONLY be soluble at very high temperatures

Back

What is the purpose of a boiling chip in a distilling column?

Front

This breaks the surface tension and prevents superheating

Back

How can liquids with VERY close boiling points be distilled?

Front

Increasing the surface area in the distillation column (more nooks and crannies)

Back

What is the purpose of vacuum distillation?

Front

This lowers the boiling point of a liquid with a boiling point over 150 degrees C.

Back

The three quantum numbers (n, l, and m) describe the size, shape, and orientation of orbitals in an atom. What do these three numbers describe?

Front

The n quantum number describes the energy level. The l (azimuthal quantum number) describes the subshell. This subshell can consist of s, p, d, f, or other orbitals. The m describes the individual orbitals. Each has from -l to l subshells.

Back

T/F Any two solvents can be used for an extraction.

Front

F Only two immiscible solvents can be used.

Back