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3 years ago

Plz help me with 18 guys tysm!

Chemistry

1 answer:

kap26 [50]3 years ago

5 0

A convergent boundary is when two plates push against each other. a transform boundary is when they slide past each other. both can couse mid ocean ridges.

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For ethanol, propanol, and n-butanol the boiling points, surface tensions, and viscosities all increase. What is the reason for

vekshin1

Answer:

First choice. The boiling points, surface tension, and viscosities all increase because the strength of dispersion forces increases.

Explanation:

Those properties, boiling points, surface tension, and viscosities are due to the attractive intermolecular forces of the substances.

Ethanol, propanol, and n-butanol (three alcohols) have these chemical formulae:

Ethatnol: CH₃CH₂ OH
Propanol: CH₃ CH₂ CH₂ OH
n-butanol: CH₃CH₂ CH₂ CH₂ OH

So, the molecules of those substances are polar and exhibit all these types of intermolecular bonding forces:

Dipole-dipole interactions: attractive forces between the positive end of one polar molecule and the negative end of another polar molecule;

London dispersion forces: a temporary attractive force that results of temporary assymetry in the electron distribution around the nuclei. This occurs when the electrons in two adjacent atoms occupy positions that cause the atoms form temporary dipoles. These forces exist between any two molecules when they are very, very close to each other (almost touching).

Hydrogen bonding: the strongest intermolecular force. It is a type of dipole-dipole attraction, which arises between an hydrogen atom covalently bonded to a very electronegative atom (in this case oxygen) and the very electronegative atom (oxygen) of a neighboor molecule.

What answer your question is that such hydrogen bonding and dipole-dipole interactions are similar for all the three alcohols, ethanol, propanol, and n-butanol, so they are not responsible for the difference in the mentioned properties, boiling points, surface tension, and viscosities. What is different is the dispersion forces: they increase as the size of the alcohols increase.

As the molecules contain more carbon atoms, lengthen, contain more electrons and, as consequence, the dispersion forces become greater (the magnitude of the temporary dipoles formed increase). This explains the validity of the first statement, that the boiling points, surface tension, and viscosities, all increase because the strength fo the dispersion forces increase.

7 0

3 years ago

t physiological pH, the carboxylic acid group of an amino acid will be ________, while the amino group will be ________, yieldin

astraxan [27]

Answer:

At physiological pH,the carboxylic acid group of an amino acid will be deprotonated while the amino group will be protonated,yielding the zwitter ion form.

Explanation:

Deprotonated means removal of protons in an acid base reaction and protonated means addition of protons in an acid base reaction.

Both protonated and de protonated reaction takes place in catalytic acid bade reaction by changing either it's mass or it's charge.

During formation of zwitter ion, the carboxylic acid will be deprotonated by donating the H+ ion while the amino acid is protonated by taking the H+ ion.

R-CH-COOH R-CH-COO-

I ⇒ I

NH₂ NH₃ (Zwitter ion)

5 0

3 years ago

Describe what is happening within the system when it is at equilibrium in terms of concentrations, reactions that occur, and rea

cestrela7 [59]

Answer:

Describe what is happening within the system when it is at equilibrium in terms of concentrations, reactions that occur, and reaction rates.

Explanation:

The chemical equilibrium state is the state where the rate of forward reaction becomes equal to the rate of backward reaction.

At this stage the change in concentration of reactants becomes equal to the change in concentration of products.

The reaction will never cease.

That is the reason chemical equilibrium is called dynamic equilibrium.

So, forward and backward reactions will be taking place continuously at equal rates.

3 0

3 years ago

Help please please please!

LenaWriter [7]

Answer:

I say the second one, im not rlly sure tho

Explanation:

5 0

3 years ago

What is a way of transforming energy by exerting a force over distance?

xz_007 [3.2K]

Answer:

a. Work

Explanation:

If you apply a force over a given distance - you have done work. Work = Change in Energy. If an object's kinetic energy or gravitational potential energy changes, then work is done. The force can act in the same direction of motion.

8 0

3 years ago

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