Which amino acids disrupt alpha helixes?

Among the options provided, the correct formula and chemical name combination is:

PCI₂ represents phosphorus tetrachloride. The other combinations listed are not correct:

C D Q Zoom X N₂O₂ is not a valid chemical formula or name combination.

N₂O is dinitrogen monoxide (commonly known as nitrous oxide), not dinitrogen pentoxide.

Ca₂P represents calcium phosphide, not dicalcium diphosphide.

Therefore, the correct combination is PCI₂, which stands for phosphorus tetrachloride.

Phosphorus tetrachloride (PCI₂) is a chemical compound composed of one phosphorus atom bonded to two chlorine atoms. It is a colorless, toxic, and reactive liquid with a pungent odor. PCI₂ is commonly used as a precursor in various chemical reactions and synthesis processes.

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The volume that is occupied by the gas is obtained as  56 L.

We know that from the Avogadro's law, the volume that can be occupied by one mole of a gas is obtained as 22.4 L. This implies that we have to find the number of moles in the 70 g of the CO and then obtain the corresponding volume by simple proportion.

Number of moles of CO = 70.0 g/28 g/mol

= 2.5 moles

If 1 mole of the gas occupies 22.4 L

2.5 moles of the gas occupies 2.5 * 22.4/1 mole

= 56 L

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The concentration of A and B after 80 s  if the initial concentration of ab is 0.260 m, and the reaction mixture initially contains no products is 0.0091 M.

To find the concentrations of A and B after 80 s, we must write the kinetic data is given as follows for the reaction:

AB ⟶ A + B

Initial rate of the reaction is 1.62 x 10⁻³ mol/L/s

Order of reaction for AB is first order (n = 1). Now, using the first-order rate equation, the concentration of AB at time t, [AB]t can be calculated as follows:

ln [AB]0/[AB]t = k

tHere, [AB]0 is the initial concentration of AB, [AB]t is the concentration of AB at time t, k is the rate constant, and t is the time interval.

To determine the rate constant, we can use the initial rate of reaction.

Initial rate, ri = k[AB]n

Here, n is the order of reaction.

So, k = ri/[AB]n

Substituting the given values:

ri = 1.62 x 10⁻³ mol/L/s[AB]0

= 0.260 mk = ri/[AB]n

= 1.62 x 10⁻³ mol/L/s / (0.260 m)1

= 6.23 s-1

Now, we can use the rate constant to determine the concentration of AB at 80 seconds:

ln [AB]0/[AB]80 = kt

Here, k = 6.23 s-1, [AB]0 = 0.260 m, and t = 80 s.

Substituting the values:

ln (0.260 m)/[AB]80

= (6.23 s-1) (80 s)[AB]80

= [AB]0 e-kt

= (0.260 m) e-(6.23 s-1) (80 s)

= 0.0091 m

Now, since the stoichiometry of the reaction is 1:1, the concentration of A and B will be equal to each other. Therefore, [A]80 = [B]80 = 0.0091 m.

Thus, the final concentrations of A and B are 0.0091 M after 80 seconds.

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Answer:

B) Cu2+ + 2e– → Cu.

Explanation:

Hello there!

In this case, in the regard of redox reactions, we must keep in mind that half-reactions show us how the flow of electrons when an element undergoes a change in its oxidation state, say increasing or decreasing. In such a way, if the element is oxidized, increase the oxidation state, we add electrons on the right side and the contrary if the element is reduced, decrease the oxidation state.

In such a way, we can see that the reaction B) Cu2+ + 2e– → Cu, shows how the Cu2+ cations are reduced by adding electrons to produce Cu and thus, conserve the charge.

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The volume of water for each of the following beakers to the correct number of sig figs are A= 26.4, B=24 and C = 26.44

The total volume of water in the beakers is = 76.84

The volume of water is beaker A = 26.4

The volume of water is beaker B = 24

The volume of water is beaker C = 26.44

Therefore thet total volume of the whole beakers =

Beaker A + Beaker B + Beaker C

= 26.4 + 24+ 26.44

= 76.84

Therefore, the total volume of the whole beakers = 76.84.

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There are 53 protons because the atomic number is equal to the number of protons.

The nuclear symbol for the atom with the following subatomic particles: 53p+, 54n, 53e- can be written as follows:

53 is the atomic number because it has 53 protons, and protons' charge is +1.

The mass number of the atom is 107 because it has 53 protons (53 x 1) + 54 neutrons (54 x 1) = 107.

The symbol of the element is X, where X is the symbol of the element as found on the periodic table.

Hence the symbol for this atom is:

X10753

There are 53 protons because the atomic number is equal to the number of protons.
The number of neutrons can be calculated by subtracting the atomic number from the mass number.

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Answer:

33300J

Explanation:

Given parameters:

Mass of ice  = 100g

Unknown:

Amount of energy = ?

Solution:

This is a phase change process from solid to liquid. In this case, the latent heat of melting of ice is 3.33 x 10⁵ J/kg.

 So;

            H  = mL

m is the mass

L is the latent heat of melting ice

  Now, insert the parameters and solve;

            H = mL

 mass from gram to kilogram;

            100g gives 0.1kg

  H = 0.1 x 3.33 x 10⁵ = 33300J

The 250 liters of gas that is collected in the expandable, sealed container. The sample is then heated from the 15.0 °C to the 45.0 °C at the constant pressure. The new volume of the container is 226.4 L.

The temperature and the volume at constant pressure is as :

V₁ / T₁ = V₂ / T₂

V₂ = V₁ T₂ / T₁

The initial volume of the gas, V₁ = 250 L

The final volume of the gas, V₂ = ?

The initial temperature of the gas, T₁ = 15 + 273

The initial temperature of the gas, T₁ = 288 K

The final temperature of the gas, T₂ = 45 + 273

The final temperature of the gas, T₂ = 318

V₂ = V₁ T₂ / T₁

V₂= ( 250 × 288 ) / 318

V₂ = 226.4 L

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Several amino acids serve as precursors for the synthesis of nucleotides. Among these amino acids, glycine and aspartic acid are the precursors for the synthesis of both purines and pyrimidines. Meanwhile, glutamine and aspartic acid serve as precursors for purine synthesis only, while cytosine synthesis requires aspartic acid, and thymine synthesis requires both aspartic acid and methionine.

The synthesis of nucleotides involves the conversion of amino acids to nucleotide bases through various biochemical reactions. The precursors required for purine and pyrimidine synthesis are different and involve different pathways.

Purines require the formation of a purine ring, while pyrimidines require a pyrimidine ring. The precursors for both pyrimidine and purine synthesis include aspartic acid and glycine, while glutamine is a precursor for purine synthesis only.

Aspartic acid is also a precursor for cytosine synthesis, while thymine synthesis requires both aspartic acid and methionine. These precursors are converted to nucleotide bases through a series of biochemical reactions, ultimately leading to the synthesis of nucleotides.

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The reaction produces 176.85 g of Na.

Explanation:

The equation is balanced when

2Na + 3N2 = 2NaN3

Calculating the mass of Na may be done using either the mass of NaN3 or N2.

Utilizing NaN3 Mass

The following conversions are required:

moles of Na, mass of Na, moles of NaN3, and mass of Na

500 g NaN3 = 1 mol NaN3, which equals 65.01 g NaN3 and 7.69 mol NaN3.

7.69 mol NaN3 divided by 2 mol NaN3 results in 7.69 mol Na.

1 mol Na equals 176.8 g Na, or 7.69 mol Na divided by 22.99 g Na.

Using N2 Mass

The following conversions are required:

moles of N2, mass of N2, moles of Na, and moles of N2

Using the formula: 323.20 g Na 2 mol N2 28.01 g N2 = 11.539 mol N2

2 mol Na + 3 mol N2 = 11.539 mol N2

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Answer:

yes correct

Explanation:

Answer: x = 2

Explanation:

Answer:

milk and starch solution are the colloids, hence these will show the tyndall effect

Answer:

milk and starch solution

Explanation:

Tyndall effect is shown by colloidal solutions. It is not shown by true solutions or suspensions.

Milk and starch solution are colloidal solutions. They show tyndall effect. On the other hand, common salt and copper sulphate solution are true solutions. They do not show tyndall effect.

The increase in pressure when a basketball is pumped up is caused by the change in the number of molecules (optionC).

When air is pumped into a basketball, the air molecules are forced into a smaller space, which increases the number of molecules in that space. This increase in the number of molecules leads to an increase in the pressure of the gas within the ball.To better understand why this is the case, we can use the ideal gas law, which describes the behavior of gases under various conditions. The ideal gas law is expressed as PV = nRT, where P is pressure, V is volume, n is the number of molecules, R is the gas constant, and T is temperature.
When air is pumped into a basketball, the volume of the ball remains the same (assuming the ball is rigid and does not expand), and the temperature of the air inside the ball does not change significantly. Therefore, according to the ideal gas law, the only way the pressure can increase is if the number of molecules (n) increases.
This increase in pressure is what makes the ball bouncy and allows it to be used for games and activities. It is important to note that overinflating a basketball can lead to a rupture or bursting of the ball due to the excessive pressure created by the increased number of molecules.

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Answer:

its a chemical Reaction

Explanation:

Answer: 4

Explanation:

Answer:

B. mitochondria to do cellular respiration.

Explanation:

A cell can be defined as the fundamental or basic functional, structural and smallest unit of life for all living organisms. Some living organisms are unicellular while others are multicellular in nature.

A unicellular organism refers to a living organism that possess a single-cell while a multicellular organism has many (multiple) cells.

All living organisms need energy to function. Both unicellular organisms and multicellular organism retrieve energy using mitochondria to do cellular respiration.

Basically, mitochondria is one of the cell organelles found in all living organisms and it is known as the powerhouse. Therefore, mitochondria provides all the energy required in the cell by transforming energy forms through series of chemical reactions; breaking down of glucose into Adenosine Triphosphate (ATP) used for providing energy for cellular activities in the body of living organisms.

The hydrogen bonding and dipole-dipole interactions are the two most important IMFs that are responsible for solubilizing the benzoic acid anion in the water.

When benzoic acid is added to water, it forms benzoate ions which are solvated by the solvent. The hydrogen bonding interactions between water and the benzoate ion play an important role in stabilizing the solvated complex. The two most important types of intermolecular forces (IMFs) responsible for solubilizing the benzoic acid anion in the water are:

Hydrogen bonding:

The benzoate ion has a negative charge on the oxygen atom and the hydrogen in the water molecule has a partial positive charge. When these two molecules come together, a hydrogen bond is formed between the oxygen and hydrogen atoms.

Dipole-dipole interactions:

Since the water molecule is a polar molecule, it has partial positive and negative charges. The benzoate ion is also polar in nature due to the presence of the negatively charged oxygen atom. When the polar benzoate ion interacts with the polar water molecules, the dipole-dipole interactions take place. These interactions further stabilize the solvated benzoate ions in water.

Both of these intermolecular forces are responsible for the solubilization of benzoic acid in water. Hence, the hydrogen bonding and dipole-dipole interactions are the two most important IMFs that are responsible for solubilizing the benzoic acid anion in the water.

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The

two

most important IMF's that are responsible for solubilizing the benzoic acid anion in water are dipole-dipole interactions and hydrogen bonding.

Here are some explanations to help you understand these interactions and their role in solubilizing the benzoic acid anion:

Dipole-dipole interaction:

Dipole-dipole interaction happens when two polar molecules interact with each other. The partial positive end of one molecule will attract the partial negative end of another molecule. In the case of benzoic acid, the carbonyl group (C=O) is partially negative, and the carbon ring is partially positive. The partially positive carbon ring of benzoic acid will attract the partially negative carbonyl group of another benzoic acid molecule. The same attraction also happens between benzoic acid and water molecules.

Hydrogen bonding:

Hydrogen bonding is a special case of dipole-dipole interaction that occurs when a hydrogen atom is covalently bonded to an electronegative atom, such as oxygen or nitrogen. The partially positive hydrogen atom is attracted to the partially negative oxygen or nitrogen atom of another molecule. In the case of benzoic acid, the hydrogen atom in the carboxyl group (COOH) is partially positive, and it can interact with the partially negative oxygen atom of a water molecule.

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Answer:18.015 g

Explanation:

Water has a molar mass of 18.015 g/mol . This means that one mole of water molecules has a mass of 18.015 g . So, to sum this up, 6.022⋅1023 molecules of water will amount to 1 mole of water, which in turn will have a mass of 18.015 g

Explanation:

When we consider the Standard Temperature and Pressure (STP), where the pressure is equal to 1 atm and the temperature is 273 K (0ºC), we have that the volume occupied by 1 mol of any gas will always be 22.4 L. This value corresponds to the molar volume of the gases.

22.4 L is equal to 22400 mL.

Answer: 22400 ml

The oil that provides the most monounsaturated fatty acids is olive oil. Monounsaturated fatty acids are a type of healthy fat that can help lower cholesterol levels and reduce the risk of heart disease. Olive oil is particularly rich in these fatty acids, making it a great choice for cooking and dressing salads.

While fish oil, coconut oil, flaxseed oil, and corn oil all contain some monounsaturated fatty acids, they are not as high in this type of fat as olive oil. Fish oil is a good source of omega-3 fatty acids, while coconut oil is high in saturated fat. Flaxseed oil is a good source of both omega-3 and omega-6 fatty acids, and corn oil is a good source of polyunsaturated fatty acids.

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This problem is providing us with the molality of a solution of calcium iodide as 0.01 m. So the most likely van't Hoff factor is required and theoretically found to be 3 due to the following:

In chemistry, the correct characterization of solutions also imply the identification of the ions it will release in aqueous solution. For that reason, the van't Hoff factor gives us an idea of this number, according to the formula the solute has got.

In such a way, for calcium iodide, we write its ionization equation as shown below:

\(CaI_2\rightarrow Ca^{2+}+2I^-\)

Assuming it is able to ionize due to the low molality, because if it was higher, then it won't ionize. Hence, since we have three moles of ion products, one Ca²⁺ and two I⁻, we can conclude the van't Hoff factor would be 3, although calculations may lead to a different, yet close result.

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Answer:

hydroxyl (OH)

Explanation:

hydroxyl (OH)

Answer: Fractional Distallation

Explanation: this technique relies on the compounds of the mixture. This is able to happen when there is diffrent boilling points.

The internationally accepted atomic mass standard is carbon-12 because this isotope provides a consistent and universally accepted reference for measuring atomic masses.

Carbon-12 is used as the reference isotope for the atomic mass scale because it is abundant in nature and has a stable nucleus. The atomic mass of an element is determined by considering the masses of its isotopes and their relative abundances in nature. Carbon-12, with exactly 12 amu, serves as a convenient reference point for assigning relative atomic masses to other elements and isotopes. The relative atomic mass of an element is determined by comparing the mass of each isotope of that element to the mass of carbon-12.

By using carbon-12 as the atomic mass standard, scientists have established a consistent and reliable method for comparing and measuring atomic masses across various elements and isotopes in the field of chemistry and other related sciences.

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a. low melting point: Nonmetals. b. shiny: Metals. c. poor conductor: Nonmetals. d. ductile: Metals. e. malleable: Metals. f. brittle: Nonmetals. g. good conductor: Metals. h. high melting point: Metals

a. Low melting point is generally displayed by nonmetals. Metals tend to have high melting points.

b. Metals are typically shiny due to their ability to reflect light.

c. Nonmetals are generally poor conductors of heat and electricity.

d. Metals are ductile, meaning they can be drawn into thin wires without breaking.

e. Metals are malleable, meaning they can be hammered into thin sheets or shapes without shattering.

f. Nonmetals are usually brittle, meaning they are prone to breaking or shattering when subjected to stress.

g. Metals are good conductors of heat and electricity.

h. Metals typically have high melting points compared to nonmetals.

It's important to note that these are general trends and not absolute characteristics for all metals or nonmetals. Some exceptions or variations may exist within specific elements or compounds.

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The pH of the solution after adding 43.1 g NaOH is 8.84.

We can start by using the balanced chemical equation of the reaction between NaOH and the weak acid:

HA + NaOH → NaA + H2O

where HA is the weak acid and NaA is the corresponding salt.

The balanced equation tells us that one mole of NaOH reacts with one mole of HA. Therefore, we need to first find the number of moles of NaOH added:

mass of NaOH = 43.1 g

molar mass of NaOH = 40.00 g/mol

moles of NaOH = mass/molar mass = 43.1 g/40.00 g/mol

= 1.0775 mol

Since the number of moles of NaOH is equal to the number of moles of HA that reacts with it, we can calculate the concentration of the remaining weak acid:

moles of HA = initial moles of HA - moles of NaOH

initial moles of HA = 0.70 mol/L × 0.461 L

= 0.3227 mol

moles of HA = 0.3227 mol - 1.0775 mol

= -0.7548 mol

Note that the negative value means that the weak acid is completely neutralized by the added NaOH, and the remaining excess NaOH contributes to the basicity of the solution.

The concentration of the remaining weak acid is:

remaining moles of HA = 0.00 mol/L

The equilibrium expression for the weak acid is:

Ka = [H+][A-]/[HA]

where [H+] is the hydrogen ion concentration, [A-] is the concentration of the conjugate base, and [HA] is the concentration of the weak acid.

At equilibrium, the weak acid is converted to its conjugate base A- and a small concentration of hydrogen ions. Using the acid dissociation constant pKa = -log10Ka, we can find the concentration of hydrogen ions:

pKa = -log10Ka

Ka = 10^-pKa

pKa = 6.21

Ka = 10^-6.21

= 1.37 × 10^-7

Let [A-]/[HA] = x. Then:

1.37 × 10^-7 = [H+]x/[HA]

[H+] = 1.37 × 10^-7 × [HA]/x

Since we are assuming no volume change, the original and final concentrations of the weak acid are equal. Therefore:

0.70 M × 0.461 L = [HA]

= [A-]

x = [A-]/[HA]

= 1

[H+] = 1.37 × 10^-7 mol/L

The pH of the solution is:

pH = -log10[H+]

pH = -log10(1.37 × 10^-7)

= 8.84

Therefore, the pH of the solution after adding 43.1 g NaOH is 8.84.

Adding 43.1 g NaOH to 461 mL of a 0.70 M solution of a weak acid, with a pKa of 6.21, results in a pH of 8.84.

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The missing product in a chemical reaction can be due to various reasons such as incomplete reaction, loss of product during isolation, errors in measurements, impurities in reactants or products, and side reactions.

Percent yield is a measure of the efficiency of a chemical reaction. It compares the actual yield of a reaction to the theoretical yield that could be obtained if the reaction went to completion. A percent yield of 90% means that 90% of the expected amount of product was obtained. The remaining 10% is the "missing" product.

The missing product can be due to several reasons. One possibility is that the reaction was incomplete, meaning that not all of the reactants were converted to products. This could happen if the reaction conditions were not optimal, such as if the temperature or pressure was not high enough or if the reaction time was too short.

Another possibility is that some of the product was lost during isolation, such as if it was stuck to the reaction vessel or if it evaporated. Errors in measurements can also contribute to the missing product, such as if the reactants were not accurately weighed or measured. Impurities in the reactants or products can interfere with the reaction, leading to a lower yield.

Finally, side reactions can also occur, where the reactants form other products instead of the desired product. This can happen if the reactants are not pure or if the reaction conditions are not optimal. Overall, identifying the reason for the missing product requires careful analysis of the reaction conditions and the experimental procedure.

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Answer:

Welcome to the project on communicating design details for the properties and uses of unsaturated hydrocarbons. This project aims to enhance your understanding of the characteristics and applications of unsaturated hydrocarbons.

Here are the steps to complete this project:

Step 1: Research

Research the different types of unsaturated hydrocarbons, including alkenes and alkynes. Find out their general properties, such as their reactivity, flammability, and solubility. Also, identify their uses in various industries, such as plastics, rubber, and fuel.

Step 2: Create a Design

Using your research findings, create a design to visually communicate the properties and uses of unsaturated hydrocarbons. You can use tools like Canva, PowerPoint, or other design software to create infographics, posters, or slideshows.

Step 3: Incorporate Key Information

Incorporate the key information you gathered in step 1 into your design. Make sure to include the following details:

Definitions of unsaturated hydrocarbons, alkenes, and alkynes

Properties of unsaturated hydrocarbons, including reactivity, flammability, and solubility

Applications of unsaturated hydrocarbons in various industries, such as plastics, rubber, and fuel

Examples of unsaturated hydrocarbons, such as ethene and propene for alkenes, and ethyne for alkynes

Step 4: Review and Refine

Review your design and refine it to make sure it effectively communicates the properties and uses of unsaturated hydrocarbons. Check for spelling and grammar errors, and ensure that the information is accurate and easy to understand.

Step 5: Present Your Design

Present your design to your class or teacher, and explain the properties and uses of unsaturated hydrocarbons. You can also invite feedback and questions to enhance your understanding of the topic.

In conclusion, the properties and uses of unsaturated hydrocarbons are essential for many industries. Through this project, you will gain a better understanding of unsaturated hydrocarbons and develop your communication skills to effectively present your findings. Good luck!

Explanation:

Answer:

Explanation:

The three types of unsaturated hydrocarbons is alkynes, alkenes, and aromatic hydrocarbons. Which is composed of alkynes? acetylene. brainlist

Answer:

5.14mole

Explanation:

Given parameters:

Mass of sodium bicarbonate  = 431.56g

Unknown:

Number of moles  = ?

Solution:

To find the number of moles, we use the expression below:

  Number of moles  = \(\frac{mass}{molar mass}\)  

 Molar mass = 84.01g/mol

 Number of moles  = \(\frac{431.56}{84.01}\)   = 5.14mole