A 43.40 mg sample of an alcohol
contains 15.10 mg O, 22.6 mg C, and
the rest is hydrogen. What is its
percent composition of oxygen?

[?] % O

Answer:

Quarter and half moons

Explanation:

The electron carrier that can pick up two electrons and two hydrogen ions is abbreviated NADH. NADH (nicotinamide adenine dinucleotide hydrogen) is an important electron carrier in cells.

The coenzyme nicotinamide adenine dinucleotide (NAD) is crucial for metabolism. NAD, a dinucleotide that is present in all living cells, is so named because it is made up of two nucleotides that are connected by their phosphate groups. Adenine and nicotinamide are found in different nucleotides. NAD exists in two states: an oxidised state known as NAD+ and a reduced state known as NADH (H for hydrogen). NAD transports electrons from one redox reaction to another during metabolic processes. As a result, cells have the cofactor in two different forms: By absorbing electrons from other molecules and getting reduced, NAD+ acts as an oxidising agent. When H+ is added, this reaction produces NADH, which can be utilised as a reducing agent to give electrons. The principal use of NAD is in these electron transfer processes.

It is also utilised in various other biological functions, most notably as a substrate for enzymes that modify proteins post-translationally by either adding or removing chemical groups. Due of the significance of these tasks, drug discovery efforts are focused on the NAD metabolism-related enzymes.

In living things, NAD can be created from scratch (de novo) using either tryptophan or aspartic acid, two examples of amino acids. In contrast, more intricate coenzyme components are absorbed from nutritive substances like niacin; similar substances are created by processes that deconstruct NAD, offering a salvage pathway that recycles them back into their respective active state.

It participates in energy production and metabolism. It is an oxidized form of NAD+, and is reduced back to NAD+ when it donates its electrons to the electron transport chain.

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A student measures the molar solubility of silver carbonate in a water solution to be 1.24 × 10⁻⁴ M. Based on her data, the solubility product constant for this compound is 7.63 × 10⁻¹² M³.

Stoichiometry helps us use the balanced chemical equation to measure quantitative relationships and it is to calculate the amounts of products and reactants that are given in a reaction.

Silver carbonate dissociates as follows

Ag₂CO₃ (s) ⇄ 2Ag⁺ (aq) + CO₃⁻² (aq)

To find the solubility product constant use the expression

\(K_{sp} = [A^{+}]^{a} [B^{-}]^{b}\)

where

\(K_{sp}\) = Solubility product constant

A⁺ = cation in an aqueous solution

B⁻ = anion in an aqueous solution

a, b = concentration of a and b

Molar Solubility (S) = 1.24 × 10⁻⁴ M

Solubility, Ag⁺ = 2S

Solubility, CO₃⁻² = S

Put the value in above expression, we get

\(K_{sp} = [A^{+}]^{a} [B^{-}]^{b}\)

       = [Ag⁺]² [CO₃⁻²]¹

       = [2S]² [S]¹

       = 4S² × S

       = 4S³

       = 4 × ( 1.24 × 10⁻⁴ M)³

       = 7.63 × 10⁻¹² M³

Thus from the above conclusion we can say that A student measures the molar solubility of silver carbonate in a water solution to be 1.24 × 10⁻⁴ M. Based on her data, the solubility product constant for this compound is 7.63 × 10⁻¹² M³.

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Disclaimer: The question was given incomplete on the portal. Here is the complete question.

Question: A student measures the molar solubility of silver carbonate in a water solution to be 1.24 × 10⁻⁴ M. Based on her data, the solubility product constant for this compound is ..........

Answer:

If FDA finds that the evidence supporting the proposed claim is credible and the claim can be qualified to prevent it from misleading consumers,

fda.gov

Explanation:

Answer:

C?

Explanation:

I think it is C if not let me know i will help furthermore

Plz mark brainlyiest

Answer:

if you add or subtract a neutron from an atom it will become a new isotopes of the same element

Answer:

When you add a neutron to an atom you create a new isotope of the same element you had begun with. Neutrons do not carry an electric charge so it doesn't change the charge.

Explanation:

Answer:

2NH4^+(aq) + 2OH^-(aq) ----->2NH3(g) + 2H2O(l)

Explanation:

Molecular balanced reaction equation;

2NH4Cl (aq) + Mg(OH)2---->2NH3 (g) + 2H2O (l) + MgCl2 (aq)

Complete ionic reaction equation;

2NH4^+(aq) + 2Cl^-(aq) + Mg^2+(aq) + 2OH^-(aq) ----->2NH3(g) + 2H2O(l) + Mg^2+(aq) + 2Cl^-(aq)

Net Ionic reaction equation;

2NH4^+(aq) + 2OH^-(aq) ----->2NH3(g) + 2H2O(l)

Answer:

To give non expensive spoons the appearance and the chemical resistance of the expensive ones.

Explanation:

Companies are cheap and under strict guidelines. This is their loophole.

Electroplating is the coating of metals by the process of hydrolysis. Metallic spoons are electroplated with silver to give an expensive appearance and chemical resistance.

Electroplating has been known as the electrochemical deposition of the metal on another solid metallic substrate by the process of hydrolysis or cation reduction through electric current.

This process is used to coat metals to prevent them from getting corroded. Also, it has been used to give a decorative and expensive look to ordinary metal.

The metallic spoons are electroplated with silver metal to make them look expensive and rich. The silver moves from the anode towards the cathode where the spoon is in the presence of the current.

Therefore, the metals are electroplated by silver for an expensive and rich look.

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Answer:

Accuracy

I guess

Cause then it makes sense

Hope this helps

When we multiply a reaction by 2, we double the stoichiometric coefficients of the reactants and products.

However, the standard reduction potential (E°red) is an intensive property and remains unchanged. E°red represents the potential of a single mole of electrons transferred in the redox reaction. By doubling the reaction, we effectively double the number of moles of electrons transferred, but the potential per mole of electrons remains the same. Therefore, we do not multiply E°red by 2. It is important to note that E°red values are specific to individual half-reactions and do not depend on the overall balanced equation or the reaction stoichiometry.

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Answer: Im not sure but i think its B

Explanation: Its hard to explain so im

not gonna do it

Taking into account the definition of strong acid, pH and pOH, it is obtained that the correct option is option A) [H₃O⁺]= 5.5×10⁻² M, [OH⁻]= 1.82×10⁻¹³ M, pH= 1.26

It is called strong acid, that acid that dissociates completely in solution at constant temperature and pressure. Under these conditions, the concentration of a strong acid is equal to the concentration of hydrogen ions (Hydronium or H₃O⁺). In other words, a strong acid is an acid that completely dissociates into hydrogen ions and anions in solution.  

Hydrobromic acid HBr is a strong acid, so a concentration of 0.055 M of the acid generates a H₃O⁺ concentration of the same value. This is:

[HBr]= [H₃O⁺]= 0.055 M= 5.5×10⁻² M

On the other hand, pH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance. Mathematically it is calculated as the negative logarithm in base 10 of the activity of hydrogen ions:

pH= -log [H₃O⁺]

Being [H₃O⁺]= 5.5×10⁻² M, the pH in this case is:

pH= -log (5.5×10⁻² M)

Solving:

pH= 1.26

Similarly, pOH is defined as the negative base 10 logarithm of the activity of the OH⁻ ions:

pOH= - log [OH⁻]

The following relationship can be established between pH and pOH:

pH + pOH= 14

Then, being pH = 1.26, the pOH is calculated by:

1.26 + pOH= 14

pOH= 14 - 1.26

pOH= 12.74

Replacing in the definition of pOH:

12.74= - log [OH⁻]

and solving you get:

[OH⁻]= 1.82×10⁻¹³ M

Finally, the correct option is option A) [H₃O⁺]= 5.5×10⁻² M, [OH⁻]= 1.82×10⁻¹³ M, pH= 1.26

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The reason why the AgNO3 test solution was not used to test the water-insoluble but acid-soluble unknowns in part 3 of the experiment is because AgNO3 is specifically used to test for the presence of chloride ions (Cl-) in a solution.

It forms a white precipitate of silver chloride (AgCl) when it reacts with chloride ions. In part 3 of the experiment, the purpose is to test for the presence of carbonate ions (CO3^2-) and hydroxide ions (OH-) in the unknowns. Sodium hydroxide (NaOH) and sodium carbonate (Na2CO3) are used for this purpose.

NaOH is used to test for the presence of hydroxide ions, as it forms a white precipitate of metal hydroxide when it reacts with hydroxide ions. Na2CO3 is used to test for the presence of carbonate ions, as it forms a white precipitate of metal carbonate when it reacts with carbonate ions.

Since AgNO3 is not relevant to testing for carbonate or hydroxide ions, it was not used in part 3 of the experiment. The specific tests and reagents used in an experiment depend on the specific ions or compounds being tested for, and in this case, AgNO3 was not needed for the purpose of identifying carbonate or hydroxide ions.

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Answer:

Consequently, once it encounters the mutation, the ribosome will read the mRNA sequence differently, which can result in the production of an entirely different sequence of amino acids in the growing polypeptide chain.

Explanation:

Answer:

A missense mutation is when the change of a single base pair causes the substitution of a different amino acid in the resulting protein. This amino acid substitution may have no effect, or it may render the protein nonfunctional.

Rinse the crystals with approximately 0.5 mL of ice-cold water and remove the rinse with the Pasteur pipette.

Before leaving the laboratory, also record your partner's results in your laboratory notebook. Put your product in an appropriate container Neutralize the filtrate with 1 N your sulfuric acid to destroy any remaining reducing agent.

Put the aqueous filtrate in the appropriate liquid waste container. Dispose of all contaminated Pasteur pipettes melting point and TLC capillaries, and TLC plates in the container for chemically contaminated laboratory debris.

Therefore, Rinse the crystals with approximately 0.5 mL of ice-cold water and remove the rinse with the Pasteur pipette.

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Answer:

The answer is C

Explanation:

If we assume the sum of energy that could be obtained by absolutely transforming a unit of length, m. It is compared to the speed of light in this connection. In this case, the whole mass of the electron becomes force. In this, depending on the relation of Einstein, each electron can generate 510 keV, which is why only the option of "c" is right.

Answer:

MSDSs list Liquid Paper as containing titanium dioxide, solvent naphtha, mineral spirits, resins, dispersant, and fragrances. Liquid Paper came under scrutiny in the 1980s, due to concerns over recreational sniffing of the product. The organic solvent 1,1,1-trichloroethane was used as a thinner in the product.

Explanation:

The ionic substance strontium oxide, SrO, forms from the reaction of strontium metal with molecular oxygen.

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The energy efficiency of a fuel cell can be calculated by dividing the electrical energy output by the energy input. In a fuel cell, the energy input refers to the chemical energy stored in the fuel that is converted to electrical energy through a redox reaction.

This redox reaction is spontaneous, meaning that it releases energy when it occurs. Therefore,  energy input is calculated by measuring the heat released by the reaction, which is proportional to the chemical energy of  fuel. The energy output is determined by measuring the electrical energy produced by  fuel cell. The energy efficiency is expressed as  percentage, where the higher the percentage, more efficient the fuel cell is in converting chemical energy to electrical energy.

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Answer:

Antigens (more info below)

Explanation:

Antigens determine the blood type and may be either proteins or sugar molecule complexes (polysaccharides). Genes in the blood group antigen group provide instructions for the production of antigen proteins. Blood group antigen proteins serve a variety of functions within the red blood cell membrane.

hope I helped!

The amount of heat per unit mass needed to raise the temperature by one degree Celsius is known as the specific heat.

Thus, The formula below, where c is the specific heat, is typically used to explain the relationship between heat and temperature change. If a phase shift occurs, the relationship is invalid because the temperature is unaffected by the heat added or lost during a phase transition.

Water has the highest specific heat of any common substance at 1 calorie/gram °C = 4.186 joule/gram °C. Water thus plays a crucial part in controlling temperature.

Water has a far higher specific heat per gram than a metal does. Most of the time, comparing the molar specific temperatures of different substances makes more sense.

Thus, The amount of heat per unit mass needed to raise the temperature by one degree Celsius is known as the specific heat.

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chemical b has an octanol water partitioning coefficient of 1,000. which chemical would move more easily through the soil

For flavonoids belonging to the flavone, flavonol, flavanone, and isoflavonoid subclasses, the values of the octanol-water partition coefficient (log P) were calculated. Following the dissolution of each flavonoid in an octanol-water mixture and equilibration time, both fractions were examined using high-performance liquid chromatography.

The most popular method of expressing a compound's lipophilicity is through its octanol-water partition ratio, which is the ratio of a solute's concentration in an octanolic phase that is water-saturated to that of the same solute in an aqueous phase that is octanol-saturated.

The chemical divides more into the aqueous layer than the organic layer when the K value is less than one.

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Answer:

A. 7

(assuming the water is neutral)

An atom X that has 12 protons and 12 electrons, loses 2 electrons to form an ions,  the charge of ion will be X⁺² the number of protons 12 and electrons in the ions is 10.

An atom X has 12 protons and 12 electrons that means X is a neutral atom and the atomic no. is 12 because total no. of protons is equal to atomic number. When it looses the 2 electrons then atom becomes positively charged ion . the charge on the ion is +2.

now, the no. of protons will be = 12

number of electrons will be = 12 - 2 = 10

Thus, An atom X that has 12 protons and 12 electrons, loses 2 electrons to form an ions,  the charge of ion will be X⁺² the number of protons 12 and electrons in the ions is 10.

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Answer:

C.) They both use the reflection of sound waves.

Explanation:

Right on Edge

Answer:

C.) They both use the reflection of sound waves.

Explanation:

stay safe 2021

ANSWER

The addition of HCl will shift to reactants

EXPLANATION

When some strong acid is added to a buffer, the equilibrium is shifted to the left, and the hydrogen ion concentration increases by less than expected for the amount of strong acid added. Buffer solution helps in adjusting the pH of a substance.

Since the HCl is a strong acid, it will shift to the left (reactant sides)

Given data:H2O vapor content: 13 gramsH2O vapor capacity: 52 grams at 25 degrees Celsius 13 grams at 10∘C52 grams at 30∘CFormula used to find the dew point:$$\dfrac{13}{52}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$\frac{1}{4}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$

Where A is the constantDew Point:It is the temperature at which air becomes saturated with water vapor when the temperature drops to a point where dew, frost or ice forms. To solve this question, substitute the given data into the formula.$$13/52=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$13(17.27-A)=3\pi A(ln100)$$By simplifying the above expression, we get$$A^2-17.27A+64.78=0$$Using the quadratic formula, we get$$A=9.9,7.4$$

The dew point is 7.4 since it is less than 10°C.More than 100:The term "More than 100" has not been used in the question provided.

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Water pollution is defined as the mixing of water with unwanted substances and that makes water unsafe.

Water pollution includes runoff of excess fertilizers,

herbicides, and insecticides from agricultural lands

and residential areas; oil, grease, and toxic chemicals

from urban runoff and energy production; and

sediment from improperly managed construction sites,

crop and forest lands, and eroding stream banks.

Polluted waters have high BOD which affects aquatic biodiversity.

Hpotoxic substances such as lead, arsenic, and fluoride cause many problems to aquatic animals and humans. Water contaminated with Arsenic results in diseases such as arsenicosis. Fluoride had been reported to cause depression in DNA and RNA synthesis in cultured cells, significant reductions in DNA and RNA levels, and conditions including aging, cancer, and arteriosclerosis are associated with DNA damage and its disrepair. Lead causes problems related to the central nervous system. Children and pregnant women are most at risk. Routine applications of fertilizers and pesticides for agriculture and uncontrolled runoff in water bodies. Adds nitrogen and phosphorus to water. It adds nitrogen and phosphorus to water causing eutrophication and algal blooms.

Therefore, all these activities make our water bodies a death zone for the marine ecosystem as well as humans.

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