The secondary structures shown in the protein are Question 12 options: A) α-helices and ß-pleated sheets. B) ß-pleated sheets. C) globular structures. D) α-helices.

Answer:

The situation given here is imaginary such that the life of Rock has to be found using the half-life of the element lokium that has been found inside the rock.

Half-life of any material is the amount of time taken by that particular material to decay. Now the amount of lokium found in rock can show after how many half-lives this amount has been left out.

The time elapsed will be log (L) atoms X half-life.

Explanation:

Answer:

423.44 moles

Explanation:

The oxidation number of oxygen (Group VI, period 2) is -2.

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Considering the definition of ideal gas law, the volume of the Krypton gas is 3840 mL.

An ideal gas is a theoretical gas that is considered to be composed of point particles that move randomly and do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.

The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:  

P×V = n×R×T

where P is the gas pressure, V is the volume that occupies, T is its temperature, R is the ideal gas constant, and n is the number of moles of the gas. The universal constant of ideal gases R has the same value for all gaseous substances.

Now, taking into account this law, and isolating the pressure variable (P), you get:

[tex]V=\frac{nxRxT}{P}[/tex]

In this case, you know:

Replacing in the ideal gas law:

[tex]V=\frac{0.119 molesx0.082 \frac{atmL}{moleK}x298K}{0.756579 atm}[/tex]

Solving:

V=3.84 L= 3840 mL (being 1 L=1000 mL)

Finally, the volume of the Krypton gas is 3840 mL.

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Answer:

The overall molecular shape (the molecule geometry) changes because of the lone pairs repulsion, but the electron geometry does not change because whether an atom or a lone pair is added there's still two electrons being added.

Explanation:

hope that helps :D

Answer:

Un par solitario o par de electrones no compartidos es un par de electrones de valencia que no se encuentra formando un enlace, ni compartido con otros átomos. Cuando un átomo se agrupa con otros para formar una molécula, sus electrones más externos -también conocidos como electrones de capa de valencia- dejan de pertenecer únicamente al átomo del que provienen, pasando a pertenecer a la molécula formada. Los orbitales atómicos de valencia dejan de existir como tales y pasan a formar orbitales moleculares con características diferentes a las originales. Como los pares solitarios se encuentran en la capa más externa de los átomos, cuando estos átomos forman moléculas pasan a formar parte del conjunto de electrones de valencia de la molécula. De esto se deduce que los pares solitarios son, de hecho, un subconjunto de los electrones de valencia de la molécula a la que pertenecen.

Explanation:

espero que te sirva :)

Answer:

a

Explanation:

the substance that exists

Answer:

When salt is dissolved in water, the particles of salt get into the spaces between particles of water and starts dissolving and disappear.

Explanation:

Answer:

first

Explanation:

0. 10 mol L-1 HF and 0. 10 mol L-1 CH3COONa a solution that is 0 is a good buffer system. so, option A is correct.

When acids or bases are introduced, a buffer system is a solution that resists changing in pH. Acidic solutions have pH values under seven and significant hydrogen ion ( H+ ) concentrations. Basic solutions have pH values higher than seven and high quantities of hydroxide ions ( OH- ).

The carbonate, carbonic acid buffer, the phosphate buffer, and the buffering of plasma proteins make up the body's chemical buffer system.

Plasma proteins, phosphate, bicarbonate, and carbonic acid buffers are among the buffer systems active in blood plasma. By excreting hydrogen ions and producing bicarbonate, which helps keep blood plasma pH within a normal range, the kidneys contribute to the regulation of acid-base balance.

Thus, option A is correct.

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D or A im not fully sure about my answer on that

Iron-55 (55Fe) is a radioactive isotope of iron with a nucleus containing 26 protons and 29 neutrons.

Answer:

54

Explanation:

yep

Elements are pure substances that cannot be broken down into simpler substances by ordinary chemical means.

Answer:

320 gm

Explanation:

4 Fe + 3 O2 ----> 2 Fe2O3 How many moles of iron(III) oxide, Fe2O3 , will be produced if 4 moles of iron, Fe, are consumed

for every 4 moles of Fe, 2 moles of Fe2O3 are produced.

Fe2O3 has a molar mass of (56 X 2) + (16 X 3) = 112 + 48 =160

160 X 2 =320 gm

The electron pair geometry around the central iodine in I3- is​ trigonal bipyramidal.

The shapes of molecules is determined by the Valence Shell Electron Pair Repulsion theory (VSEPR). According to this theory, The shape of a molecule depends on the number of electron pairs that surround the valence shell of the central atom in the molecule.

In the structure I3-, the iodine is sp3d hybridized and has a bond angle of 180°. There are three iodine atoms. The central iodine atom is surrounded by two bond pairs and three lone pairs. The  electron pair geometry around the central iodine in I3- is​ trigonal bipyramidal.

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Elements in the same group of the periodic table tend to have similar chemical properties

For Al;

a. Period: Period 3

b. Group: Group 13

c. Proton Number (Atomic Number): 13

d. Number of Electrons: 13

e. Electronic Configuration: 1s² 2s² 2p⁶ 3s² 3p¹

f. Number of Outer-Shell Electrons: 3

g. Similar Properties: Boron (B)

For Boron (B):

a. Period: Period 2

b. Group: Group 13

c. Proton Number (Atomic Number): 5

d. Number of Electrons: 5

e. Electronic Configuration: 1s² 2s² 2p¹

f. Number of Outer-Shell Electrons: 3

g. Similar Properties: Aluminium (Al)

For Nitrogen (N):

a. Period: Period 2

b. Group: Group 15

c. Proton Number (Atomic Number): 7

d. Number of Electrons: 7

e. Electronic Configuration: 1s² 2s² 2p³

f. Number of Outer-Shell Electrons: 5

g. Similar Properties: Phosphorus (P)

For Oxygen (O):

a. Period: Period 2

b. Group: Group 16

c. Proton Number (Atomic Number): 8

d. Number of Electrons: 8

e. Electronic Configuration: 1s² 2s² 2p⁴

f. Number of Outer-Shell Electrons: 6

g. Similar Properties: Sulfur (S)

For Phosphorus (P):

a. Period: Period 3

b. Group: Group 15

c. Proton Number (Atomic Number): 15

d. Number of Electrons: 15

e. Electronic Configuration: 1s² 2s² 2p⁶ 3s² 3p³

f. Number of Outer-Shell Electrons: 5

g. Similar Properties: Nitrogen (N)

For Sulfur (S):

a. Period: Period 3

b. Group: Group 16

c. Proton Number (Atomic Number): 16

d. Number of Electrons: 16

e. Electronic Configuration: 1s² 2s² 2p⁶ 3s² 3p⁴

f. Number of Outer-Shell Electrons: 6

g. Similar Properties: Oxygen (O)

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Answer:

members shall perform their duties with integrity, intelligence and competence in the application of specialized skill and technical knowledge with excellence and expertise.

Explanation:

any members on duty should be wiling and ready to help at all times

Answer:

4

Explanation:

atoms of O2 in the product side:

(3×2)+(2×1)=8

so to balance it:

x × 2 =8

x=4

Answer:

Carbon dioxide, when present in sufficient amounts, will bind with water to form carbonic acid, which is capable of dissociating into bicarbonate and hydrogen ions.

Explanation:

With the help of carbonic anhydrase which further catalyzes the reaction to convert carbonic acid back into carbon dioxide and water. The carbon dioxide is then expelled from the lungs.

Answer:

I think it's C I think that's the answer

Answer:SODIUM CARBONATE

Explanation:

Answer:

KBr final solution:

V = 250mL --> 0.25L

Concentration/Molarity = 1.5 mol/L

To find the amount of moles of KBr here, just multiply the volume by the concentration (0.25 x 1.5 = 0.375 mol)

So the amount of moles for KBr is 0.375 mol. Now we know that the mass divided by the molar mass (the atomic mass values of K and Br in the periodic table added together) would give us the amount of moles aswell.

n = moles

m = mass

M = molar mass

n = m/M

so if we rearrange this equation to find mass, we would get:

m = n x M

Molar mass for KBr: (39.09) of K + (79.90) of Br = 118.99

m = 0.375 mol    x    118.99

m = 44.62g

Therefore 44.62g of KBr is needed to make 250mL of a 1.5 M KBr solution.

Answer:

If the initial hypothesis is not supported, you can go back to the drawing board and hypothesize a new answer to the question and a new way to test it. ... Either way, the process of experimentation often leads to whole new questions to explore.

Scientific inquiry uses evidence from observations and investigations to create logical explanations to answer questions related to science. Scientific inquiry is different from the scientific method. ... Scientific inquiry helps you think outside the box to understand the natural world.

Unlike social scientists, behavioral scientists collect empirical data and use experimental methods, including testing, controls and manipulated settings.

Explanation:

Answer:

a table is a grid of rows and columns that intersect to form cells

Explanation:

Answer:

its letter d ..................................

Answer:

We would need a picture to help you out with this.

Explanation:

Answer:

Explanation:

When two substances at different temperatures like into contact, the substance that is at higher temperature will transfer energy, in the form of heat, to the substance that is at lower temperature, until their temperatures get equal.

In this case, if the two substances are isolated of the rest of the universe, the law of conservation of energy states that the heat released by the substance initially at higher temperature is the same amount of heat gained by the substance originally at lower temperature.

Answer: do you guys know the answer

Explanation:

Answer:

gains,oxidizing

Explanation:

Zn(s) + Cu^2+---> Zn^2+(aq) + Cu(s)

I got the answer right on usatp.