Classify the molecules as hydrophilic, hydrophobic, or amphipathic (amphiphilic).

1 answer:

8 0

Since there are no molecules to classify, the best I could do is to discuss as much what are the characteristics of molecules that are classified as hydrophilic, hydrophobic, or amphipathic (amphiphilic). Hydrophilic molecules are molecules which are "water-loving" which means they are dissolved in water. These molecules are polar molecules. Examples are salt, milk and soap. Hydrophobic molecules are molecules which are "water-fearing" which means they do not dissolve in water. Examples are oils, fatty acids and soap. As you can see from the examples, soap is written in both. This is because soap has both hydrophobic end and hydrophilic end which makes it an amphiphatic or amphiphilic molecule.

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Which one of the following reactions would produce t-butyl methyl ether in high yield?

swat32

Answer:

D) sodium t-butoxide + bromomethane

Explanation:

The alkoxide ion is a strong nucleophile, that unlike alcohols, will react with primary alkyl halides to form ether. This general reaction is known as <em>the Williamson synthesis</em>, and is a SN₂ displacement. The alkyl halide must be primary so the back side attack is not hindered, and the alkoxide ion must be formed with the most hindered group.

The mechanism can be seen in the attachment.

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4 years ago

A student checks the air in her bicycle tires early in the morning when it is cool outside. If she measures it again later in th

Dmitry_Shevchenko [17]

Answer:

She will observe that the pressure on the tire is higher.

Explanation:

By the ideal gas law, the pressure and the temperature are directly proportional, so, if the temperature increases the pressure increases too:

PV = nRT (P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature).

The temperature is a measure of the average kinetic energy of the gas molecules, so when the temperature increases, the energy also increases, and the gas molecules will move more quickly, so they will collide more often between themselves and in the wall. Those collisions will be with more force because the velocity is higher.

So, the pressure will be higher, because it is the result of collisions of the gas molecules with the walls of the tire.

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3 years ago

The solubility of acetanilide is 0.53 g in 100 mL of ice‑cold water, and 5.50 g in 100 mL of boiling water. What is the maximum

GrogVix [38]

Answer:

MPR=90,36%

Explanation:

The recrystallization is a purification process where the solid to purify is dissolved in an appropriated dissolvent and then, changing the conditions the solubility changes and that solid (that was in solution before) precipitates and form crystals.

In this case, for boiling water 5.50 g of acetanilide could be dissolved and then cold the water, so the mass of crystals formed will be

$m_{crystal}=\left(5.5-0.53\right)g=4.97g$