A nonapeptide was determined to have the following amino acid composition: (Arg)2, (Gly)2, (Phe)2, His, Leu, Met. 1-fluoro-2,4-dinitrobenzene (FDNB) reacts with free amino (but not amido or guanidino) groups in proteins to produce dinitrophenyl (DNP) derivatives of amino acids. The native peptide was incubated with 1-fluoro-2,4-dinitrobenzene (FDNB) and then completely hydrolyzed; 2,4-dinitrophenylhistidine was identified by HPLC. What does this tell you about the peptide sequence? When the native peptide was exposed to cyanogen bromide (CNBr), an octapeptide and free glycine were recovered. What does this tell you about the peptide sequence? Incubation of the native peptide with trypsin gave a pentapeptide, a tripeptide, and free Arg.The peptides were separated and treated with FDNB. 2,4-Dinitrophenyl-histidine was recovered from the pentapeptide, and 2,4-dinitrophenylphenylalanine was recovered from the tripeptide.What does this tell you about the peptide sequence? Digestion with the enzyme pepsin produced a dipeptide, a tripeptide, and a tetrapeptide. The tetrapeptide was composed of (Arg) 2, Phe, and Gly. What does this tell you about the peptide sequence? What is the sequence of the nonapeptide?

Answer:

for points

Explanation:

loll

Answer:

goes on to the circle

Explanation:

hm and the I have know what how much you have want

Answer:

The salt and sugar as well as the baby power and granulated sugar are the independent variables.

The dependent variable is how it reacts (will it dissolve or not)

Explanation:

Answer:

luka for MVP

Explanation:

cus he better than lebron and jordan

128.4 grams of carbon are required to produce 10.7 moles of methane.

The balanced chemical equation for the reaction C + 2H2 - CH4 is as follows:C + 2H2 ⟶ CH4.

In this equation, we can see that for one mole of methane (CH4), one mole of carbon (C) and two moles of hydrogen (H2) are required.

The molar mass of carbon is 12 g/mol.

The molar mass of methane is the sum of the molar masses of its constituent atoms, which is 12 g/mol (for carbon) + 4(1 g/mol) (for hydrogen) = 16 g/mol.

To find the amount of carbon required to produce 10.7 moles of methane, we can use the following proportion:1 mole CH4 : 1 mole C

Therefore,10.7 moles CH4 : x moles C.

Thus,x = 10.7 moles C.

Since we know the molar mass of carbon (12 g/mol), we can convert the moles of carbon to grams:mass = moles × molar massmass of carbon required = 10.7 moles × 12 g/mol= 128.4 g.

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Answer:

He proposed a model of the atom that consisted of a positively charged sphere with negatively charged electrons embedded in it. This model was later called the plum pudding model. Thomson’s discovery of the electron showed that atoms were not indivisible, as previously thought, but composed of smaller subatomic particles. His model also explained some phenomena such as cathode rays and electric currents. Thomson’s work helped advance our understanding of the structure and nature of the atom.

Explanation:

Answer:

condensation

Explanation:

Answer:

Condensation

Explanation:

The process of a gas changing back into a liquid is called condensation.

Coenzyme q carries electrons from complex I to complex III  and complex II to complex III  in the electron-transport chain.

Coenzyme q  (CoQ), also known as ubiquinone, is the electron carrier in the electron transport system (ETS) present on the inner membrane of mitochondria.

Ubiquinone is a ubiquitous quinone, which accepts electrons from complex II ( succinate dehydrogenase) and  reduces to ubiquinol ( reduced form)

The purpose of the ETS is to generate an H+ ion concentration, by carrying electrons obtained from NADH AND \(FADH_{2}\)   produced by the Krebs cycle and glycolysis in the mitochondrial matrix. This  H+ ion potential will be used by ATP synthase to generate ATP.

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The inner mitochondrial membrane contains CoQ, a key part of the mitochondrial electron transport chain (ETC), which moves electrons from complexes I and II to complex III to provide energy for proton translocation to the intermembrane gap.

An organelle called a mitochondrion can be found in the cells of the majority of Eukaryotes, including mammals, plants, and fungi. Adenosine triphosphate, which is produced by aerobic respiration in mitochondria with their double membrane structure, is used as a source of chemical energy throughout the entire cell.

Coenzyme Q10 takes electrons from reducing equivalents produced during the metabolism of fatty acids and glucose and then transports them to electron acceptors as part of the mitochondrial electron transport chain.

Ubiquinone, also known as coenzyme Q, is a lipophilic molecule that is found in all tissues and cells and is mostly found in the inner mitochondrial membrane. It is generally known that Coenzyme Q is an essential part of the oxidative phosphorylation process in mitochondria.

Thus, The inner mitochondrial membrane contains CoQ, a key part of the mitochondrial electron transport chain (ETC).

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Answer:

it is the unit of Force

Explanation:

force is equal to Newton

Answer:

https://sooddan.zendesk.com

Answer:

C

Explanation:

It has the lowest Ksp, so it will have the lowest Molar Solubility

The process of dissolved solute particles being surrounded by the  water molecules in an aqueous solution is called solvation or hydration.

Solvation occurs when water molecules surround and interact with solute particles, usually ions or polar molecules, forming a stable solution. The water molecules surround the solute particles, with their polar ends facing the solute, creating a layer of water molecules around the solute particles, effectively dispersing and stabilizing them throughout the solution.

Solvation is a key process in many chemical and biological reactions that occur in aqueous solutions, as it helps to facilitate the dissolution of solutes and influences their properties and behavior in solution.

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--The given question is incomplete, the complete question is

"The process of dissolved solute particles being surrounded by water molecules in an aqueous solution is called ----------- ."--

Yes, we can conclude that a white solid that weighs 105.5 mg and is presumed to be cocaine (C₁₇H₂₁NO₄) produces 279.3 mg of CO2 and 66.46 mg of water upon combustion.

Cocaine is a tropane alkaloid that has both local and central nervous system (CNS) stimulating effects. Cocaine inhibits the re-uptake of dopamine, serotonin, and norepinephrine into pre-synaptic neurons by binding to the transport proteins for these neurotransmitters. The salt form of cocaine is called cocaine hydrochloride. The taste is bitter and numbing, and it is a fine white powder.

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The complete question is -

A 105.5mg sample of a white substance, suspected of being cocaine (C17H21NO4), forms 279.3mg of CO2 and 66.46mg of water on combustion. Chemical analysis shows that the compound contains 4.68% N by mass. Would you conclude that the white solid is cocaine?​

In an ecosystem, the reason that ocean marine biomes are a challenging place for organisms to live because they have to be able to live in extremely salty conditions.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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Answer:

The water ligands surrounding the cobalt metal center are being replaced by ethylenediamine and chloride ligands which results in a different crystal field splitting. Thus, the energy associated with electron transitions between the do-orbitals will differ for the two compounds showing a color change.

Explanation:

The five d-orbitals are usually degenerate. Upon approach of a ligand, the d-orbitals split into two sets of orbitals depending in the nature of the crystal field.

The magnitude of crystal field splitting is affected by the nature of the ligand. Ligands having filled p-π orbitals such as ethylenediamine lead to greater crystal field splitting.

The change in the colour that takes place when ethylenediamine is added to the solution of cobalt(II) chloride occurs due to a different crystal field splitting pattern. Thus, the energy associated with electron transitions between the d-orbitals now differ for the two compounds showing a color change.

Answer: The osmotic pressure of 5.0g of sucrose solution in 1 L is 271.32 torr.

Explanation:

Given: Mass = 5.0 g

Volume = 1 L

Molar mass of sucrose = 342.3 g/mol

Moles are the mass of a substance divided by its molar mass. So, moles of sucrose are calculated as follows.

\(Moles = \frac{mass}{molarmass}\\= \frac{5.0 g}{342.3 g/mol}\\= 0.0146 mol\)

Hence, concentration of sucrose is calculated as follows.

\(Concentration = \frac{moles}{Volume (in L)}\\= \frac{0.0146 mol}{1 L}\\= 0.0146 M\)

Formula used to calculate osmotic pressure is as follows.

\(\pi = CRT\)

where,

\(\pi\) = osmotic pressure

C = concentration

R = gas constant = 0.0821 L atm/mol K

T = temperature

Substitute the values into above formula as follows.

\(\pi = CRT\\= 0.0146 \times 0.0821 L atm/mol K \times 298 K\\= 0.357 atm (1 atm = 760 torr)\\= 271.32 torr\)

Thus, we can conclude that the osmotic pressure of 5.0g of sucrose solution in 1 L is 271.32 torr.

Answer:

7.859 g/cm³.

Explanation:

Density = Mass/Volume

the mass of the iron sample is 27.3162g and its volume is 3.475 cm³, so calculate its density as:

Density = 27.3162g/3.475 cm³ = 7.859 g/cm³

Therefore, the density of the iron sample is 7.859 g/cm³.

Answer:

Decreasing the temperature will decrease the rate of a reaction.

Explanation:

The rate of the reaction is directly proportional to the absolute temperature.

Answer:

Pretty sure it's B

Explanation:

1. The rms speed of O₂ molecules at 427 K is 576.9 m/s

2. The rms speed of He atoms at 427 K is 1631.7 m/s

The rms speed of the various elements can be obtained as follow:

1. For O₂ molecules

rms speed = √(3RT / μ)

rms speed of O₂ molecules = √(3 × 8.314 × 427 / 0.032)

rms speed of O₂ molecules = 576.9 m/s

2. For He atoms

rms speed = √(3RT / μ)

rms speed of He atoms = √(3 × 8.314 × 427 / 0.004)

rms speed of He atoms = 1631.7 m/s

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Electrons in metals are delocalised. Electrons in ionic bonds are transferred from a metal to a non-metal. Electrons in a covalent bond are shared between two non-mtal ions.

- Eddie

Answer: is that a question or

Explanation:

Answer:

its c

Explanation:

Answer:

(A) It matches the universal pH indicator and is indicating the proper pH.

Explanation:

Correct on edge 2021

Given the data from the question, the correct statement is:

This is simply a measure of the acidity / alkalinity of a solution.

The pH measures the hydrogen ion concentration while the pOH measures the hydroxide ion concentration

The pH scale is a scale that gives an understanding of the variation of the acidity / alkalinity of a solution.

The scale ranges from 0 to 14 indicating:

These are devices / equipment used to indicate if a solution is acidic, neutral or basic.

From the question given above, we were told that the universal and the cabbage pH indicator gives the same result.

Therefore, we can conclude that the cabbage indicator is indicating the proper pH (Option A)

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The percent by mass of nitrogen in ammonia (NH3) is approximately 82.15%

Calculating the mass of nitrogen to the total mass of the compound and then expressing the result as a percentage will allow us to determine the percent by mass of nitrogen in NH3 (ammonia).

Ammonia's molecular structure, NH3, indicates that it is made up of one nitrogen atom (N) and three hydrogen atoms (H). We must take both the molar masses of nitrogen and ammonia into account when calculating the percent by mass of nitrogen.

Nitrogen's (N) molar mass is roughly 14.01 g/mol. The molar masses of nitrogen and hydrogen are added to determine the molar mass of ammonia (NH3). Since hydrogen's molar mass is around 1.01 g/mol, ammonia's molar mass is:

(3 mol H 1.01 g/mol) + (1 mol N 14.01 g/mol) = 17.03 g/mol = NH3.

Now, we can use the following formula to get the nitrogen content of ammonia in percent by mass:

(Mass of nitrogen / Mass of ammonia) / 100% is the percentage of nitrogen by mass.

Ammonia weighs 17.03 g/mol and contains 14.01 g/mol of nitrogen by mass. By entering these values, we obtain:

(14.01 g/mol / 17.03 g/mol) 100% 82.15 % of nitrogen by mass

Ammonia (NH3) has a nitrogen content that is roughly 82.15 percent by mass.

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According to the information, we can infer that a 19.2-pound child would need to take approximately 2.49 tablets of 250.0 mg ampicillin per day.

To calculate the number of tablets the child needs to take, we first need to convert the weight of the child from pounds to kilograms. Since there are 2.20 pounds in 1 kg, we divide 19.2 pounds by 2.20 to get the weight in kilograms, which is approximately 8.73 kg.

Next, we calculate the daily dose of ampicillin for the child by multiplying the weight in kilograms by the recommended dosage of 115 mg/kg.

Since the available tablet size is 250.0 mg, we divide the total daily dose by the tablet size to find out how many tablets the child needs to take per day.

According to the above, we can infer that since we can't have a fraction of a tablet, we round the result to the nearest whole number. Therefore, a 19.2-pound child would need to take approximately 2.49 tablets (rounded to 2) of 250.0 mg ampicillin per day.

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There are approximately \(2.76 * 10^{24\) ammonia molecules in the given sample.

To calculate the number of ammonia molecules in the sample, we need to use Avogadro's number and the molar mass of ammonia.

The molar mass of ammonia \((NH_3)\) can be calculated by adding up the atomic masses of nitrogen (N) and hydrogen (H):

Molar mass of \(NH_3\) = (1 x atomic mass of N) + (3 x atomic mass of H)

              = (1 x 14.01 g/mol) + (3 x 1.01 g/mol)

              = 14.01 g/mol + 3.03 g/mol

              = 17.04 g/mol

Now, we can calculate the number of moles of ammonia in the sample using the formula:

Number of moles = Mass of the sample / Molar mass

Number of moles = 78.25 g / 17.04 g/mol

              ≈ 4.5865 mol (rounded to four decimal places)

Finally, we can use Avogadro's number, which represents the number of particles (atoms, molecules, etc.) in one mole of a substance. Avogadro's number is approximately \(6.022 * 10^{23\) particles/mol.

Number of ammonia molecules = Number of moles x Avogadro's number

Number of ammonia molecules ≈ 4.5865 mol x (\(6.022 * 10^{23\) molecules/mol)

                           ≈ \(2.76 * 10^{24\) molecules (rounded to two significant figures)

Therefore, the provided sample contains roughly \(2.76 * 10^{24\) ammonia molecules.

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The number of ammonia molecules in the sample is approximately 2.764 x \(10^{24}\) molecules.

To calculate the number of ammonia molecules in a given sample, we need to use Avogadro's number and the molar mass of ammonia.

The molar mass of ammonia (NH3) is calculated as follows:

Molar mass of N = 14.01 g/mol

Molar mass of H = 1.01 g/mol

Total molar mass of NH3 = 14.01 g/mol + (3 * 1.01 g/mol) = 17.03 g/mol

Now, we can calculate the number of moles of ammonia in the sample:

Number of moles = Mass of sample / Molar mass of NH3

Number of moles = 78.25 g / 17.03 g/mol = 4.594 moles

Next, we use Avogadro's number, which states that there are 6.022 x \(10^{23}\) molecules in one mole of a substance.

Number of molecules = Number of moles * Avogadro's number

Number of molecules = 4.594 moles * 6.022 x \(10^{23}\) molecules/mol = 2.764 x \(10^{24}\) molecules

Therefore, there are approximately 2.764 x \(10^{24}\) ammonia molecules in the given sample of 78.25 g.

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Answer:

Watch Naruto that's the answer

Explanation:

When 2.0 moles of KCIO3 decompose, 2.0 moles of O2 will form.

The balanced chemical equation shows that 2 moles of KCIO3 decompose to produce 3 moles of O2. Therefore, we can use the stoichiometric ratio from the balanced equation to determine the number of moles of O2 formed when 2.0 moles of KCIO3 decompose.

According to the stoichiometry, 2 moles of KCIO3 produce 3 moles of O2. Therefore, we can set up a proportion:

(2 moles KCIO3 / 2 moles O2) = (2.0 moles KCIO3 / x moles O2),

where x represents the unknown number of moles of O2 formed.

Simplifying the equation:

(2 moles KCIO3 / 2 moles O2) = (2.0 moles KCIO3 / x moles O2),

1 = (2.0 moles KCIO3 / x moles O2),

Cross-multiplying:

x moles O2 = (2.0 moles KCIO3 / 1),

x moles O2 = 2.0 moles KCIO3.

Therefore, when 2.0 moles of KCIO3 decompose, 2.0 moles of O2 will form.

It is important to note that this calculation assumes complete and ideal conditions, where the reaction proceeds with 100% efficiency. In reality, the actual yield of O2 may be lower due to various factors such as side reactions or incomplete decomposition. To determine the actual yield, additional information or experimental data would be required.

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