Describe the effect of resonance on the amount of rotation that can occur in the main chain of your tripeptide (phenylalanine, alanine, and tyrosine), which affects protein folding.

The pH of a 0.188 M NH3 solution at 25°C, with a Kb of 1.76 x 10^-5, is approximately 11.26.

determine the pH of a 0.188 M NH3 solution at 25°C. The Kb of NH3 is 1.76 x 10^-5.

Write the reaction for NH3 in water:
NH3 + H2O ⇌ NH4+ + OH-

Set up an ICE table (Initial, Change, Equilibrium):
NH3      + H2O    ⇌  NH4+    +  OH-
Initial: 0.188 M          0 M       0 M
Change: -x                  +x         +x
Equilibrium: 0.188-x M    x M      x M

Write the Kb expression and substitute the equilibrium concentrations:
Kb = [NH4+][OH-] / [NH3]
1.76 x 10^-5 = (x)(x) / (0.188-x)

Make the approximation that x is much smaller than 0.188, so the equation becomes:
1.76 x 10^-5 ≈ x^2 / 0.188

Solve for x, which represents [OH-]:
x = sqrt(1.76 x 10^-5 * 0.188)
x = 0.00183

Calculate the pOH:
pOH = -log10(0.00183)
pOH = 2.74

Determine the pH by subtracting the pOH from 14:
pH = 14 - 2.74
pH = 11.26

The pH of a 0.188 M NH3 solution at 25°C, with a Kb of 1.76 x 10^-5, is approximately 11.26.

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Answer:

Start with the temperature in Fahrenheit (e.g., 100 degrees).

Subtract 30 from this figure (e.g., 100 - 30 = 70).

Divide your answer by 2 (e.g., 70 / 2 = 35).

Answer:

0.111 moldm⁻³

First work out the moles of NaOH dispensed from the burette:

1. (25.0/1000)x0.100 = 0.00250 moles of HCl

Next use the balanced equation to reason how many moles of HCl are present in the flask:

2. 1:1 therefore 0.00250 moles NaOH

Lastly, now that you have both the volume and the number of moles of HCl, work out its concentration.

3. 0.0025/(22.5/1000) = 0.111 moldm⁻³

Explanation:

Answer:

The concentration of the hydrochloric acid is 0.00047 mol/dm³.

Explanation:

The balanced equation for the reaction is:

2 HCl(aq) + Ba(OH)2(aq) → BaCl₂(aq) + 2H₂O

We know that 25.00 cm³ of the hydrochloric acid reacted with 23.50 cm³ of the 0.100 mol/dm³ barium hydroxide solution.

Given the balanced equation, it is clear that 2 moles of hydrochloric acid react with 1 mole of barium hydroxide. As we know the volume and concentration of the barium hydroxide, we can calculate the number of moles of barium hydroxide present in the 23.50 cm³ of solution.

23.50 cm³ of 0.100 mol/dm³ barium hydroxide = (23.50 x 0.100) / 1000 = 0.00235 moles

As 2 moles of hydrochloric acid react with 1 mole of barium hydroxide, and we know the number of moles of barium hydroxide, we can calculate the number of moles of hydrochloric acid.

0.00235 moles of barium hydroxide / 2 = 0.001175 moles hydrochloric acid

We have the number of moles of hydrochloric acid, we can calculate the concentration in mol/dm³.

0.001175 moles hydrochloric acid / 25.00 cm³ = 0.00047 mol/dm³

The concentration of the hydrochloric acid is 0.00047 mol/dm³.

Answer:

C

Explanation:

Because i just had to do this on my assignment and got 100

Answer:

hey , its option c because in chemical reaction colour + evolution of gas takes place + temp. + precipitation. but also light can come in the case of chemical reaction.

Answer: 1.0 M

Explanation:

250 mL = 0.25 L

molarity = (moles of solute)/(liters of solution) = 0.25/0.25 = 1.0 M

The energy needed to start a chemical reaction is called activation energy. The correct option is (3).

Activation energy refers to the minimum amount of energy required for a chemical reaction to begin or proceed. It acts as a barrier that needs to be overcome for reactant molecules to transform into products.

In order for a reaction to occur, the reactant molecules must have sufficient energy to surpass this energy barrier. Activation energy can be thought of as the "hurdle" that reactant molecules must jump over to initiate a chemical reaction.

Once the reaction is initiated and the activation energy is surpassed, the reactants undergo a series of bond-breaking and bond-forming processes, releasing or absorbing energy in the form of heat. Activation energy is a critical factor in determining the rate of a chemical reaction. Therefore, the correct option is (3).

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Answer:

1.58L

Explanation:

Given parameters:

Initial volume  = 1.2L

Initial temperature  = 28.5°C  = 28.5 + 273  = 301.5K

Final temperature  = 125°C  = 125 + 273  = 398K

Unknown:

New volume  = ?

Solution:

Volume and temperature relationship is resolved using the Charles's law.

The law states that "the volume of a fixed mass of a gas varies directly as its absolute temperature if the the pressure is constant".

So;

       \(\frac{V1}{T1}\)    = \(\frac{V2}{T2}\)  

V1 is the initial volume

T1 is the initial temperature

V2 is the new volume

T2 is the new temperature

             \(\frac{1.2}{301.5}\)    = \(\frac{V2}{398}\)    

              301.5V2  = 477.6

                       V2  = 1.58L

Answer:

Answer: medium level profession can be defined as some one who has moved past entry level but isn't nearing the end . whereas high level profession means a person has moved past entry level and also has reached the end.

Answer:

medium level profession refers to the profession that can be carried out with the help of extra khowledge,skill and vocational training

higher level profession refers to the top level profession that requires higher education and special indeth tranning

The compound OH CH.CH.CHCH. CH,CH,CH is named 3-heptanol because it has a chain of seven carbon atoms with an OH group attached to the third carbon atom.

The compound OH CH.CH.CHCH. CH,CH,CH is named 3-heptanol.

To understand why it is named 3-heptanol, let's break down the name step by step:

1. The OH group at the beginning of the compound indicates that it is an alcohol, specifically a hydroxyl group (-OH) attached to a carbon chain.

2. The CH.CH.CHCH part of the compound indicates a chain of four carbon atoms. The numbers in front of the CH groups represent the positions of these carbon atoms in the chain.

3. Since there is an OH group attached to the third carbon atom in the chain, the compound is named 3-heptanol. The "hept" in the name refers to the seven carbon atoms in the chain, and the "ol" at the end indicates that it is an alcohol.

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Algunas acciones viables para utilizar los recursos ambientales de forma racional y con el objetivo de reducir la contaminación son:

Es fundamental para la preservación y mantenimiento del medio ambiente y la calidad de vida de las generaciones actuales y futuras. El desarrollo de acciones sostenibles promueve la protección del medio ambiente, los ecosistemas y los recursos naturales.

Por lo tanto, todas las personas e instituciones económicas pueden promover la sostenibilidad a través de prácticas fáciles de ejecutar que ayuden a preservar y proteger el medio ambiente.

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Answer: 70 percent

About 97 percent of Earth's water is in the ocean.

The ocean covers more than 70 percent of the surface of our planet. It's hard to imagine, but about 97 percent of the Earth's water can be found in our ocean. Of the tiny percentage that's not in the ocean, about two percent is frozen up in glaciers and ice caps.

Hope this helps...... Stay safe and have a Merry Christmas!!!!!!!!!!! :D

Explanation:

In a synthesis reaction, 3.2 grams of magnesium combined with 12.0 grams of oxygen. The maximum amount of magnesium oxide that can be produced in this reaction is 5.33 grams,

The balanced chemical equation for the synthesis of magnesium oxide is 2 Mg + O2 → 2 MgO.

According to this equation, 2 moles of magnesium react with 1 mole of oxygen to produce 2 moles of magnesium oxide. To determine the maximum amount of magnesium oxide produced, the given masses of magnesium and oxygen are converted into moles using their respective molar masses.

The molar mass of magnesium (Mg) is approximately 24.31 g/mol, and the molar mass of oxygen (O2) is around 32.00 g/mol. By dividing the given mass of magnesium (3.2 grams) by its molar mass, we obtain approximately 0.132 moles of magnesium.

Similarly, dividing the given mass of oxygen (12.0 grams) by its molar mass, we obtain approximately 0.375 moles of oxygen. Since the ratio between magnesium and magnesium oxide is 1:1, the amount of magnesium oxide produced will be equal to the amount of magnesium used. Therefore, the maximum amount of magnesium oxide that can be produced during the reaction is approximately 0.132 moles. Converting this to grams using the molar mass of magnesium oxide (40.31 g/mol), we find that the maximum amount of magnesium oxide produced is approximately 5.33 grams.

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Answer: Molasses is very thick so it cools in the cold

Explanation:

The net  equation for the CNO cycle is given below ,

he net equation for the proton-proton chain .

4 \(^{1} H^{+}\)+ 2 e- → \(^{4} He^{2+}\) + 2 ν

The early phase, also known as the "fast phase," the short phase, often known as the "supergiant phase," and the death phase, also known as the "supernova explosion," are the three main phases in the life of a star.

The Carbon-Nitrogen-Oxygen cycle, or CNO cycle, occurs throughout the main sequence phase.

In this stage, six distinct reactions occurring inside a star cause hydrogen to fuse into helium.

The carbon 12 isotope's nucleus releases gamma rays after engulfing a proton to create nitrogen-13 as the first stage in the chain.

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Answer:

Ions are formed when atoms lose or gain electrons in order to fulfill the octet rule and have full outer valence electron shells.

Explanation:

When they lose electrons, they become positively charged and are named cations. When they gain electrons, they are negatively charged and are named anions.

The elements of period 2 that satisfy the descriptions are;

a) Neon

b) carbon

c) sodium

c) sodium

We know that the periodic table is an arrangement of the elements in the order of their reactivity. We know that the elements that we have are arranged into groups and periods.

The elements that are in the same group do have similar chemical properties while the elements that are in the same period do have the same number of shells. The properties of the elements in a periods tends to change across the period.

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1.00mol is the correct answer

The well-known ports range from 0 to 1023. These ports are reserved for specific services and protocols, and they are commonly used by system processes or by programs executed by privileged users.

Here is a breakdown of some commonly known ports within the well-known port range:

20: FTP Data

21: FTP Control

22: SSH (Secure Shell)

23: Telnet

25: SMTP (Simple Mail Transfer Protocol)

53: DNS (Domain Name System)

80: HTTP (Hypertext Transfer Protocol)

110: POP3 (Post Office Protocol version 3)

143: IMAP (Internet Message Access Protocol)

443: HTTPS (HTTP Secure)

465: SMTP over SSL/TLS

587: SMTP Submission

993: IMAPS (IMAP over SSL/TLS)

995: POP3S (POP3 over SSL/TLS)

These are just a few examples, and there are many other services and protocols assigned to specific well-known ports within the range of 0 to 1023.

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A maximum of two electrons will be placed in 1s first. With a maximum of two electrons, 2s will then be filled. With a maximum of 6 electrons, 2p will then be filled.

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Answer: there are 118 elements

Explanation:

According to electronic configuration, semimetal in group 8A is antimony and an alkali metal with a lower atomic number than barium is cesium.

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.Elements undergo chemical reactions in order to achieve stability.

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The first civil war battle on Georgia soil was the Battle of Chickamauga, which took place on September 18-20, 1863.

What is Georgia soil?
Georgia soil is a type of soil found in the U.S. state of Georgia. It is mostly composed of loamy sand, silt, and clay, with a pH level of around 6.5. Georgia soil is predominantly neutral, meaning it is neither acidic nor alkaline. This type of soil is considered to be a prime agricultural soil due to its excellent drainage and water-holding capacity. The fertility of Georgia soil varies by region, with some areas having higher levels of organic matter and nutrient content than others. Georgia soil is also generally well-drained, making it an ideal medium for gardening, landscaping, and farming. Furthermore, Georgia soil is well-suited to growing a variety of plants, including vegetables, fruits, grains, and flowers.

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\(2Mg + 2HCl = MgCl_2 + H_2\)

The remaining mass has escaped the test tube, as hydrogen is in gaseous form.

Metallic solids,

the atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties. All exhibit high thermal and electrical conductivity, metallic luster, and malleability.

Answer: c. metallic

The events in the order of top to bottom for a digital recording to become sound waves through a speaker include:

This is defined as a pattern of disturbance caused by movement of energy along a medium.

The order of events which produces the sound heard by audience can be seen above.

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Answer:Because there are so many units for energy.

Explanation:

The partial pressures of NO2, O2, and N2 can be found by multiplying the total pressure by the mole fraction of each gas component. The partial pressures of NO2, O2, and N2 are 0.60 atm, 0.66 atm, and 0.74 atm, respectively

Mole fraction is a unitless quantity used to express the ratio of the number of moles of a particular substance to the total number of moles in a mixture. It is defined as the ratio of the number of moles of a component in a mixture to the total number of moles of all components in the mixture. The mole fraction of a component can range from 0 to 1, and the sum of the mole fractions of all components in a mixture is always equal to 1.

First, we need to calculate the mole fractions of each gas component:
The mole fraction of NO2 = 0.300 (given)
The mole fraction of O2 = 0.330 (given)
The mole fraction of N2 = 0.368 (given)
The mole fraction of trace gases = 0.002 (calculated as 1 - sum of other mole fractions)
Next, we can calculate the partial pressures of each gas component:
The partial pressure of NO2 = 2.00 atm x 0.300 = 0.60 atm
The partial pressure of O2 = 2.00 atm x 0.330 = 0.66 atm
The partial pressure of N2 = 2.00 atm x 0.368 = 0.74 atm
Therefore, the partial pressures of NO2, O2, and N2 are 0.60 atm, 0.66 atm, and 0.74 atm, respectively.

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Answer:

The reaction has a high activation energy

Explanation:

The burning of methane is a spontaneous reaction. Once the burning begins, the flame is able to sustain itself without any additional input of energy. It is an exothermic reaction in which energy is given out in the form of heat.

The reason why heat from the match is needed to start the burning of methane is that the activation energy of the combustion of methane is high. Activation energy is the energy that must be supplied in order for the collision of reactants to result in chemical reaction.

As long as the activation energy is high, the reaction can not occur without an external input of energy (e.g striking a match). Hence the answer.