The amino acid backbone is h2n-ch-cooh, with an r-group on the alpha carbon. why is it that this backbone is not actually present under biological conditions?

The gold that would be plated from jewelry that is electroplated with gold for 25 seconds at 1.5A is 0.07 grams.

The gold that would be plated can be calculated according to the electrochemical equation which is AU ++ 1e-Au(s).

Now, electrochemical reaction will result the plating of 1 atom of gold for 1 electron. So for 25 seconds at 1.5 A, we get 1.5*25 = 37.5 coulombs of electrons since the ampere is equal to coulomb per second.

The number of electrons we have if coulomb of electrons about 6.241Ă*10^18 electrons is 6.241Ă*10^18*37.5 = 2.34*10^20. Then we can calculate the moles using Avogadro's number which is 2.34*10^20 / 6.02*10^23 = 3.88*10^-4.

Then, we can calculate the grams of gold by multiplying the number of moles by the weight of the atom gold. So, 3.88*10^-4 * 196.96657 = 7.65*10^-2.

Thus the number of gold that would be plated in grams is 7.65*10^2 or equal to 0.077 grams.

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The lattice energy for the magnesium fluoride can be calculated as -3314 kJ/mol

Lattice energy is the energy released when gaseous ions come together to form a solid ionic compound. It is a measure of the strength of the electrostatic forces of attraction between the ions in an ionic crystal lattice.

Lattice energy depends on several factors, including the charges of the ions involved and the distances between them. The magnitude of the lattice energy increases with higher charges on the ions and decreases with larger ionic radii or greater separation between ions.

We have that Using the Hess law;

Lattice energy =  -1124  - 15 - 2(157) - (738 + 1451) -  (-328)

= -3314 kJ/mol

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The balanced chemical equation for the reaction between solid calcium bicarbonate and aqueous acetic acid to form aqueous calcium acetate, water, and gaseous carbon dioxide is:

Ca(HCO3)2(s) + 2CH3COOH(aq) → Ca(CH3COO)2(aq) + H2O(l) + 2CO2(g)

The reaction involves the reaction of calcium bicarbonate (Ca(HCO3)2) with acetic acid (CH3COOH). The chemical formula for calcium bicarbonate can also be written as calcium hydrogen carbonate.

First, let's write the unbalanced equation based on the reactants and products:

Ca(HCO3)2 + CH3COOH → Ca(CH3COO)2 + H2O + CO2

To balance the equation, we need to ensure that the number of atoms of each element is the same on both sides of the equation.

Starting with the carbon atoms, there are two carbon atoms on the left side (in CH3COOH), but only one on the right side (in Ca(CH3COO)2).

To balance this, we need to place a coefficient of 2 in front of Ca(CH3COO)2:

Ca(HCO3)2 + 2CH3COOH → 2Ca(CH3COO)2 + H2O + CO2

Next, let's balance the hydrogen atoms. There are six hydrogen atoms on the left side (in 2CH3COOH), but only four on the right side (in H2O and 2Ca(CH3COO)2).

To balance this, we need to place a coefficient of 4 in front of H2O:

Ca(HCO3)2 + 2CH3COOH → 2Ca(CH3COO)2 + 4H2O + CO2

Finally, let's balance the oxygen atoms. There are eight oxygen atoms on the left side (in Ca(HCO3)2 and 2CH3COOH), but only six on the right side (in 2Ca(CH3COO)2).

To balance this, we need to place a coefficient of 2 in front of Ca(HCO3)2:

2Ca(HCO3)2 + 2CH3COOH → 2Ca(CH3COO)2 + 4H2O + CO2

Now the equation is balanced, and the coefficients indicate the stoichiometric ratio of the reactants and products.

The balanced chemical equation for the reaction between solid calcium bicarbonate and aqueous acetic acid to form aqueous calcium acetate, water, and gaseous carbon dioxide is:

2Ca(HCO3)2(s) + 2CH3COOH(aq) → 2Ca(CH3COO)2(aq) + 4H2O(l) + CO2(g),

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The partial pressure of krypton is 64.77mmHg

Given:

Nitrogen = 75.2%

krypton = 24.8%

total pressure is 651 mmHg

Solution:

calculate the mole fraction of the components

Mole fraction of tha krypton

Mole fraction of tha kryptonX2 = moles of the crypton/total moles of the 3 gas mixture

X2 = 0.296mol/(2.68+0.296)mol = 0.0995

partial pressure of the crypton:

total pressure x mole fraction of the crypton

651mm Hg x 0.0995 = 64.77 mm Hg

Hence, the partial pressure of krypton is 64.77mmHg

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Explanation:

mass of a unit volume of a material substance

The mass of anhydrous magnesium sulfate that will remain is 11.7 g.

When a hydrated salt such as MgSO₄⋅7H₂O is heated thoroughly so it becomes anhydrous, all the moles of water of crystallization are driven off.

The mass of anhydrous magnesium sulfate will remain if 24.0 g of MgSO₄⋅7H₂O is thoroughly heated is calculated as follows:

Molar mass of MgSO₄⋅7H₂O = 24 + 32 + 16 * 4 + 7 * 18

Molar mass of MgSO₄⋅7H₂O = 246 g/mol

Percentage mass of anhydrous magnesium sulfate will be:

mass of MgSO₄ = 24 + 32 + 16 * 4

mass of MgSO₄ = 120 g

Percentage mass of anhydrous magnesium sulfate = 120/246 * 100%

Mass of anhydrous magnesium sulfate that will remain = 120/246 * 100 * 24

Mass of anhydrous magnesium sulfate that will remain = 11.7 g

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First, we calculate the moles of each element taking the percentages as a mass:

We divided the number of moles by the smaller number of moles. In this case, C is the smallest:

These numbers give us the empirical formula wich is: CH2

It is not possible to write any program using only sequence structures.

Sequence structures, which involve executing instructions in a sequential order, are a fundamental part of programming. However, to create meaningful and functional programs, additional control structures such as conditionals (if statements) and loops are necessary. These control structures allow for decision-making and repetition, enhancing the capabilities and flexibility of a program.

While sequence structures alone provide a basic foundation for organizing instructions, they are limited in their ability to create complex programs. Incorporating control structures like conditionals and loops is essential for implementing logic, branching, and repetitive tasks in programming. Therefore, the combination of sequence structures with other control structures is crucial for building robust and functional programs.

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It means that the air near the Earth's surface is denser compared to the other parts.

99.9% of the air particles are found in the lower part of the atmosphere because the air in this region is denser than the other regions.

Air density increases with increased pressure and as we move up in altitude, air pressure decreases.

Thus, as air pressure decreases with height, the density of air also decreases. This is why most of the air particles are found in the lower part of the atmosphere.

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The third quantum number (m_l) of a 3s² electron in phosphorus is 0.

The third quantum number, denoted as m_l, represents the magnetic quantum number and describes the orientation of an orbital within a subshell. It can have integer values ranging from -l to +l, where l is the azimuthal quantum number.

In the electron configuration of phosphorus, we see that the 3s subshell is being filled. The azimuthal quantum number (l) for the 3s subshell is 0. Since the electron is in the 3s² subshell, there are two electrons present in the 3s orbital.

For the two electrons in the 3s orbital, they will have opposite spins due to the Pauli exclusion principle. However, the magnetic quantum number (m_l) for both electrons in the 3s orbital will be the same, which is 0.

Therefore, the third quantum number (m_l) of a 3s² electron in phosphorus is 0. This means that both electrons in the 3s orbital have the same orientation within the subshell.

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Yes, the number of different colors used on a form should be limited to three colors, exclusive of black (K), white (W), and gray (G).

When designing a form, it is generally recommended to keep the color scheme simple and limited. Using too many colors can create visual clutter and make the form harder to read and understand. By restricting the number of colors to three (excluding black, white, and gray), you can maintain a clean and cohesive design.

Black, white, and gray are considered neutral colors that are often used for text, backgrounds, or borders. By excluding them from the count of different colors, you ensure that you have three additional colors for highlighting important information, indicating sections, or adding visual interest.

This limited color palette helps create a visually balanced form that is both aesthetically pleasing and functional, making it easier for users to navigate and complete the form.

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Explanation:

In a physical change the nature of the substance, the particles of which it is composed and the numbers of particles remain unchanged. In a chemical change the properties of the new substances are different from the original, the particles are different and the number of particles can change

The formation of ionic bonds between elements from Group I (alkali metals) and Group VII (halogens) occurs through a transfer of electrons. Alkali metals have one valence electron in their outermost shell, while halogens require one more electron to complete their outermost shell and achieve a stable electron configuration.

Let's take the example of sodium (Na) from Group I and chlorine (Cl) from Group VII to illustrate the formation of an ionic bond. Sodium has one valence electron, while chlorine requires one electron to complete its outer shell.

In a dot-and-cross diagram, sodium is represented by the symbol Na, with a dot next to it representing its single valence electron. Chlorine is represented by the symbol Cl, with seven dots around it representing its seven valence electrons.

To form an ionic bond, sodium will transfer its single valence electron to chlorine. This results in sodium losing one electron to become a positively charged sodium ion (Na+), as it now has one less electron than protons. Chlorine, on the other hand, gains the electron from sodium, resulting in a negatively charged chloride ion (Cl-), as it now has one more electron than protons.

In the dot-and-cross diagram, the electron transfer is represented by an arrow from sodium to chlorine, indicating the movement of the electron. The final configuration shows the sodium ion (Na+) with no dots around it, indicating the loss of its valence electron, and the chloride ion (Cl-) with eight dots around it, representing the complete octet in its outermost shell.

The resulting sodium ion and chloride ion are held together by the strong electrostatic attraction between the oppositely charged ions. This attraction forms an ionic bond, creating an ionic compound known as sodium chloride (NaCl), commonly known as table salt.

This process of electron transfer and formation of ionic bonds occurs between elements from Group I and Group VII, leading to the creation of stable compounds with full outer shells for both elements.\(\huge{\mathcal{\colorbox{black}{\textcolor{lime}{\textsf{I hope this helps !}}}}}\)

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Answer:

2 g/mL

Explanation:

d = m/v

d= 8/4

d=2

hope that helps!

Answer:

the answer is the emission of radiation from an atoms of a unstable element

Answer:

the answer is number 3, the emission of radiation...

Explanation:

Answer: the answer is  D im pretty sure

Explanation:

To keep burning, fires require oxygen. Carbon dioxide is used in certain fire extinguishers to put out flames. Explanation: Because magnesium is higher on the reactivity scale than carbon, it is more reactive and eliminates oxygen from carbon dioxide (to give carbon and magnesium oxide).

Answer:

I can’t see the whole page

Explanation:

Answer:

the answer for 5 is liquid

Adding heat to water results in a relatively small temperature change because water has a high specific heat capacity.What is the specific heat capacity?The specific heat capacity is the amount of energy required to raise the temperature of a unit of mass of a substance by one degree Celsius (or Kelvin).

The specific heat capacity of a substance can be determined experimentally by measuring the amount of heat required to raise the temperature of a sample of the substance by a certain amount. The formula used to calculate the amount of heat absorbed or released by a substance is Q = mcΔT. Q represents the heat energy, m is the mass of the substance, c is the specific heat capacity, and ΔT is the change in temperature. This formula shows that the amount of heat energy absorbed by a substance is directly proportional to its specific heat capacity. The specific heat capacity of water: Water has a high specific heat capacity which means that it takes a lot of energy to raise its temperature. This is because the hydrogen bonds between water molecules require a lot of energy to break. As a result, water can absorb large amounts of heat energy without experiencing significant changes in temperature. Conversely, when heat is removed from water, its temperature drops very slowly. This is why water is an excellent coolant, as it can remove large amounts of heat energy without experiencing significant changes in temperature. Therefore, adding heat to water results in a relatively small temperature change because water has a high specific heat capacity.

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X is the chemical symbol of the element

Answer:

there is none

Explanation:

your thinking of the symbol for chemical symbol for the element

If carbonite existed,  its likely chemical formula will be CO₂²⁻.

The carbonite is liquid substance that is made from the carbon and the oxygen. the carbonite could change in the solid form through rapid freezing. carbonite is used to freeze the good for preservation is called as the carbon freezing. the carbonite is the blasting explosive. so, the carbon freezing is the process in which the liquid carbonite is frozen into the solid state.

Thus, in the movie star wars episode v: the empire strikes back, the character han solo is frozen in the fictional material, carbonite. if carbonite existed,  its likely chemical formula will be CO₂²⁻.

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The formulas of the compounds that were shown are;

CaCl2

K2S

AlBr3

BeF2

MgS

Ionic compounds are a type of chemical compound made up of ions, which are atoms or molecules that have a positive or negative charge due to the gain or loss of electrons. In ionic compounds, positive ions (cations) are typically metal atoms, while negative ions (anions) are typically non-metal atoms. These ions are held together in a crystal lattice structure by strong electrostatic forces, forming a solid, crystalline substance.

Ionic compounds typically have high melting and boiling points, and they are often soluble in water. They are also typically poor conductors of electricity in the solid state, but good conductors in the melted or dissolved state due to the movement of ions.

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Aerosols are lost from the atmosphere through wet or dry deposition.

The correct answer is C)

Wet deposition refers to the process where aerosols are removed from the atmosphere through precipitation, such as rain or snow. When aerosols are present in the air, they can be captured and brought down to the Earth's surface by falling precipitation.

Dry deposition, on the other hand, involves the direct settling of aerosols from the atmosphere onto surfaces without the involvement of precipitation.

This can occur through gravitational settling, where the particles simply fall out of the air and deposit onto surfaces, or through other mechanisms such as impaction or diffusion.

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Answer:

Home

Home

Slower

Explanation:

A liquid starts changing its phase to gas when the two pressures become the same i.e., vapor and atmospheric.

At a higher altitude the atmospheric pressure lowers so little amount of heat is required for the vapor pressure of water to equalize with the atmospheric pressure at a higher altitude.

The pressure at the Rosa's home will be higher and lower in the campsite.

The boiling point will be higher at her home.

As the boiling point is lower in the campsite the water used in cooking noodles will evaporate faster this may lead to the noodles being under cooked. The water may evaporate before the noodles have cooked. So, the noodles will cook at a slower rate at the campsite and faster in her home.

A. The atmospheric pressure at Rosa's home is higher than her campsite.

B. The boiling point of water at Rosa's home is higher.

C. The noodles will be cooked faster at Rosa's home compared to at the campsite

A. The pressure has been the force that has been exerted by the molecules against each other, The higher altitude has lesser air molecules, which resulted in the lower pressure.

Since the pressure at 33 feet has been higher as than the pressure at 11,000 feet altitude, the atmospheric pressure at Rosa's home is higher than her campsite.

B. The boiling point has been the temperature at which liquids have been converted to gases. With the decrease in atmospheric pressure, there has been a lowering in the boiling point as well.

The atmospheric pressure at Rosa's home is higher compared to her campsite. Thus, the boiling point of water at Rosa's home is higher.

C. The lower atmospheric pressure at the campsite has been responsible for the lower boiling point of the temperature, This implies that water has converted to steam at lower temperatures. The lower temperature of water requires more time for the noodles to be cooked.

Thus, the noodles will be cooked faster at Rosa's home compared to at the campsite.

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Answer:

Frequency of spinal trait in the population = 0.11

Explanation:

Given:

Total spineless trait = 600

Number of spinal trait = 80

Find:

Frequency of spinal trait in the population

Computation:

Total population = Total spineless trait + Number of spinal trait

Total population = 600 + 80

Total population = 680

Frequency of spinal trait in the population = Number of spinal trait / Total population

Frequency of spinal trait in the population = 80 / 680

Frequency of spinal trait in the population = 0.11

Answer:

eukaryotic

Explanation:

prokaryotic organisms are single-cellular (bacteria)

eukaryotic organisms are multi-cellular (animals, plants, etc.)

Answer:

Continental Drift

Explanation:

The fossils of sea creatures could have reached the top of Mount Everest due to the continental drift theory suggested by geophysicist, Alfred Wegener. To exaggerate, a piece of evidence that supports Wegener’s hypothesis towards a continental drift is the fact that fossils of sea creatures can’t just end up in any random place like Mount Everest. He suggests that there must be something behind this and gradually it led to his well-known theory. His hypothesis towards a continental drift suggests that his second observation was that fossils of the same prehistoric species were found in different continents that were way apart. There was just no way that all the organisms could cross the oceans and reach all of these places.

A distilling flask should be filled no more than two thirds of its capacity at the beginning of the distillation procedure to prevent boiling over or bumping.



When a liquid is heated, it expands and turns into a gas or vapor. If the flask is overfilled, the expanding vapor can force liquid up into the condenser and potentially contaminate the distillate. Additionally, if the liquid boils too vigorously, it can cause the boiling mixture to bump and splash out of the flask. By filling the flask no more than two thirds full, there is enough headspace for the expanding vapor to collect without risking contamination or bumping. it can cause the boiling mixture to bump and splash out of the flask. By filling the flask no more than two thirds full, there is enough headspace for the expanding vapor to collect without risking contamination or bumping.When a liquid is heated, it expands and turns into a gas or vapor. If the flask is overfilled, the expanding vapor can force liquid up into the condenser and potentially contaminate the distillate.


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