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Mariulka [41]
3 years ago
15

The pKa of an acid depends partly on its environment. Predict the effect of each of the following environmental changes on the p

Ka of a glutamic acid side chain. (a) A lysine side chain is brought into proximity. (b) The terminal carboxyl group of the protein is brought into close proximity.
Chemistry
1 answer:
Alenkinab [10]3 years ago
5 0

Answer:

A. Decrease

B. Increase

Explanation:

A. A lysine side chain is brought into proximity:

lysine is basic in its nature, it would have to stabilize the electrostatic interaction and also weak interactions existing among the acidic amino acids and hydrogen bond. This would then reduce or decrease the pH and thus pKa of the protein.

B. The effect of this on pKA is an increase on the pKA. The carboxyl group is acidic. When it is removed, it would then cause the pKA to be increased. There would be accumulation of more negative change by basic amino acids increasing the pKA.

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Furkat [3]
There are a lot of empty space between the particles
5 0
3 years ago
A silver block, initially at 58.4∘C, is submerged into 100.0 g of water at 25.0∘C in an insulated container. The final temperatu
Vlada [557]

Answer:

The mass of the silver block is 95.52 grams.

Explanation:

Heat lost by silver will be equal to heat gained by the water

-Q_1=Q_2

Mass of silver= m_1

Specific heat capacity of silver = c_1=0.235 J/g^oC

Initial temperature of the silver = T_1=58.4^oC

Final temperature of a silver = T_2=T=26.7^oC=

Q_1=m_1c_1\times (T-T_1)

Mass of water= m_1=100.0 g

Specific heat capacity of water= c_2=4.186 J/g^oC

Initial temperature of the water = T_3=25^oC

Final temperature of water = T_3=T=26.7^oC

Q_2=m_2c_2\times (T-T_3)

-Q_1=Q_2

-(m_1c_1\times (T-T_1))=m_2c_2\times (T-T_3)

-(m_1\times 0.235 J/g^oC\times (26.7^oC-58.4^oC))=100.0 g\times 4.186 J/g^oC\times (26.7^oC-25.0^oC)

On substituting all values:

we get, m_1 = 95.52 g

The mass of the silver block is 95.52 grams.

3 0
4 years ago
Barium nitrate reacts with aqueous sodium sulfate to produce solid barium sulfate and aqueous sodium nitrate. abigail places 20.
raketka [301]
I will assume the chemical reaction equation is like this:
<span>Ba(NO3)2 + Na2SO4 ---> 2 NaNO3 + BaSO4
</span>
For every 1 barium nitrate molecule used, there will be 1 barium sulfate formed. The number of molecule barium sulfate formed would be: <span>20.00 ml * 0.500 mol/1000ml * 1= 0.01 mol

The mass of barium sulfate produced: 0.01mol * </span>233.38 g/mol= 2.3338 grams
8 0
3 years ago
Read 2 more answers
In photosynthesis, plants convert what type of energy into what other type of energy? please help
Nana76 [90]

Answer:

Photosynthesis, the process by which green plants and certain other organisms transform light energy into chemical energy. During photosynthesis in green plants, light energy is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds.

5 0
3 years ago
Which atom’s ionization energy is greater than that of phosphorus (P)? A. Ba B. K C. As D. Cl
aalyn [17]
<h3>Answer:</h3>

                   Chlorine (Cl)

<h3>Explanation:</h3>

                           Ionization Energy is defined as, "the minimum energy required to knock out or remove the valence electron from valence shell of an atom".

Trends in Periodic table:

               <em>Along Periods:</em>

                                        Ionization Energy increases from left to right along the periods because moving from left to right in the same period the number of protons (atomic number) increases but the number of shells remain constant hence, resulting in strong nuclear interactions and electrons are more attracted to nucleus hence, requires more energy to knock them out.

               <em>Along Groups:</em>

                                        Ionization energy decreases from top to bottom along the groups because the number of shells increases and the distance between nucleus and valence electrons also increases along with increase in shielding effect provided by core electrons. Therefore, the valence electrons experience less nuclear attraction and are easily removed.

<h3>Conclusion:</h3>

                   As Barium is present down the group and to the left of periodic table, K present at the left of the periodic table, Arsenic present below Phosphorous will have less ionization energies as compared to P. Hence, only Chlorine present at the right extreme of periodic table and right to P will have greater Ionization energy.

7 0
4 years ago
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