All categories

4 years ago

Modify lysine, below, to show the predominant form at pH 7.

Chemistry

2 answers:

vfiekz [6]4 years ago

6 0

The pH 7, suggests neutral state, that is, no proton in the solution. Its composition is given in the attachment below.

At pH = 7, Lysine possess net charge of +1. The isoelectric point of lysine is 9.75. Thus, its shows +1 net charge, it is actually a fractional charge.

Akimi4 [234]4 years ago

5 0

Basically, both amine groups will be pronated while the carboxylic acid will be depronated due to their pkas.

You might be interested in

The air bags in cars are inflated when a collision triggers the explosive, highly exothermic decomposition of sodium azide (NaN3

Oksanka [162]

Answer : The mass of $NaN_3$ required is, 166.4 grams.

Explanation :

First we have to calculate the moles of nitrogen gas.

Using ideal gas equation:

$PV=nRT$

where,

P = Pressure of $N_2$ gas = 1.00 atm

V = Volume of $N_2$ gas = 113 L

n = number of moles $N_2$ = ?

R = Gas constant = $0.0821L.atm/mol.K$

T = Temperature of $N_2$ gas = $85^oC=273+85=358K$

Putting values in above equation, we get:

$1.00atm\times 113L=n\times (0.0821L.atm/mol.K)\times 358K$

$n=3.84mol$

Now we have to calculate the moles of sodium azide.

The balanced chemical reaction is,

$2NaN_3(s)\rightarrow 2Na(s)+3N_2(g)$

From the balanced reaction we conclude that

As, 3 mole of $N_2$ produced from 2 mole of $NaN_3$

So, 3.84 moles of $N_2$ produced from $\frac{2}{3}\times 3.84=2.56$ moles of $NaN_3$

Now we have to calculate the mass of $NaN_3$

$\text{ Mass of }NaN_3=\text{ Moles of }NaN_3\times \text{ Molar mass of }NaN_3$

Molar mass of $NaN_3$ = 65 g/mole

$\text{ Mass of }NaN_3=(2.56moles)\times (65g/mole)=166.4g$

Therefore, the mass of $NaN_3$ required is, 166.4 grams.

3 0

3 years ago

What must be true of the net charge for any sample of sodium chloride

Ede4ka [16]

Answer:

Zero (0)

Explanation:

Since Na^+ has a charge of +1 and Cl^- has a charge of —1 in NaCl

Then the net = +1 —1 = 0

4 0

4 years ago

Read 2 more answers

Which of these is a combustion and synthesis reaction?

klasskru [66]

A is the correct answer. A combustion reaction creates carbon dioxide and water. A is the only answer choice were carbon dioxide and water are made.

3 0

4 years ago

Read 2 more answers

Which chemical property makes a substance suitable as a fuel?

inessss [21]

Ethanol's chemical formula is C2H5OH.Properties. Pure ethanol is a flammable, colorless liquid with a boiling point of 78.5° C. Its low m

4 0

3 years ago

Read 2 more answers

vagabundo [1.1K]

First, explain what a wave is, what a mechanical wave is, and what an electromagnetic wave is.

Wave: a disturbance (perturbation, pulse) that transport energy but not matter. They can translate either longitudinally (longitudinal waves) or transversally (transverse waves).

Mechanical waves: waves that need a medium to travel (transport its energy.

Examples of mechanical waves are: sound (longitudinal wave), water waves (transverse waves), rope wave (transverse waves), slinky waves (may be both transverse and longitudinal waves).

Electromagnetic waves: waves that can travel in the vacuum.

They are produced by the vibration of charged particles and are always transverse waves.

Examples of electromagnetic waves are: visible light, microwaves, ultraviolet waves, infrared waves, among other.

Now, you can understand these similarities and differences:

Similarities:

- Both can travel in the air and water.

- Both transfer energy (all waves to that)

Differences:

- Mechanical waves do not travel in empty space; electromagnetic waves do.

- Electromagnetic waves (light) slow down when pass from air to water (refraction of light); some mechanical waves (sound) speed up when pass from air to water.

5 0

3 years ago

Read 2 more answers