Which pair of substances is capable of forming a buffer in aqueous solution?
a. hno3 and kno3
b. hi and nai
c. h2co3 and nacl
d. hcooh and nacooh

A buffer solution is composed of 8.50 mol of acid and 2.25 mol of the conjugate base.

What is pH of a solution?

The concentration of hydrogen (H+) ions in a solution, which is a measurement of acidity, is known as the pH of that solution. Acidic solutions have a pH under 7. The same holds true for solutions that have a pH higher than 7.

A buffer solution is one that prevents the pH of a solution from changing when a little amount of a strong acid or basic is added.

Given,

pKa of acid = 4.20

[acid] = 8.50

[base] = 2.25

pH of buffer = pKa + log [base]/[acid]

= 4.20 + log[2.25/8.50]

=3.622

Thus, pH of the buffer is 3.662.

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Force and gravity work together with simple objects exert an equal attractive force

Gravity or gravitational force is the force of attraction between any two objects in the universe and the force of attraction depends on the mass of the object and the square of the distance between them and it is by far the weakest known force in nature the size of the gravitational force is proportional to the masses of the objects and weakens as the distance between them increases and both objects exert an equal attractive force on each other and falling object is attracting the earth with the same size force as the earth is attracting it

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The threshold quantity for hydrogen sulfide under PSM is 1500 pounds, whereas, under RMP, the threshold is 10,000 pounds.

Each column lists all of the elements that employers must comply with when a process falls under PSM and that specific RMP program in the column header.

By clicking on an element listed in that column, employers can view the regulatory text of both PSM and the RMP program for that element.

As described at the bottom of each of those links, OSHA requirements are in bold, EPA requirements are in italics, and regular font shows areas where the regulatory requirements are identical.

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The most common technique used to measure oxygen consumption today is termed open-circuit spirometry.

The method of performing spirometry known as "open circuit" entails the subject inhaling as much air as possible from the surrounding environment, putting the mouthpiece in his or her mouth, and then exhaling either slowly (SVC) or quickly (FVC) until the end-of-test criterion is reached. With devices based on wedge bellows, bell, water seal, or rolling seal cylinder/piston-based volume sensing spirometers, open circuit approach is frequently utilized.

The method of measuring spirometry known as "closed circuit" spirometry involves having the subject place a flow transducer in their mouth, breathe normally for two to three tidal breaths (rest breathing), take a maximal inspiration or expiration through the flow transducer, and then slowly inhale or exhale.

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Thermal properties and calcium-magnesium-alumina-silicate (cmas) resistance of lupo4 as environmental barrier coatings lupo4 synthesized by chemical precipitation and calcination

Thermal properties means material-dependent response when heat is distributed to a solid body, a liquid, or a gas  and then temperature increase, a phase transition, a change of length or volume, an formationof a chemical reaction or the change of some other physical or chemical property or quantity called as thermal properties. so here thermal properties and calcium-magnesium-alumina-silicate (cmas) resistance of lupo4 is the phase stability and the thermal properties of the ceramics as well as the thermochemical reactions between lupo4 pellet and calcium–magnesium–alumina–silicate at 1300°C this dense and continuous layer can effectively inhibit molten cmas penetration into lupo4.

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Answer:

I think the answer is assume

The solid pieces of lead with a mass of 38.20 g has a density of 11,340 Kg/ m3

The density formula and the procedure we will use is:

ρ = m/v

Where:

Information about the problem:

Applying the density formula, we get:

ρ = m/v

ρ = 38.20 g/ 3.37 cm3

ρ(g/cm3) = 11.34 g/cm3

Converting the density from (g/cm3) to (kg/m3), we get:

11.34 g/cm3 * (1 kg/1000g) * (1000000 cm3/1 m3) = 11,340 Kg/ m3

11.34 g/cm3 is equivalent to 11,340 Kg/ m3

It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.

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The United States uses many different energy sources and technologies to generate electricity. The sources and technologies have changed over time, and some are used more than others.

The three major categories of energy for electricity generation are fossil fuels (coal, natural gas, and petroleum), nuclear energy, and renewable energy sources. Most electricity is generated with steam turbines using fossil fuels, nuclear, biomass, geothermal, and solar thermal energy. Other major electricity generation technologies include gas turbines, hydro turbines, wind turbines, and solar photovoltaics.

Natural gas was the largest source—about 38%—of U.S. electricity generation in 2021. Natural gas is used in steam turbines and gas turbines to generate electricity.

Coal was the second-largest energy source for U.S. electricity generation in 2021—about 22%. Nearly all coal-fired power plants use steam turbines. A few coal-fired power plants convert coal to gas for use in a gas turbine to generate electricity.

Petroleum was the source of less than 1% of U.S. electricity generation in 2021. Residual fuel oil and petroleum coke are used in steam turbines. Distillate—or diesel—fuel oil is used in diesel-engine generators. Residual fuel oil and distillates can also be burned in gas turbines.

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It is negatively charged

As the diagram showed,

inner part contains nucleus which constitute proton and neutron

and the outer part contain electron dense clouds which is negatively charged

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The temperature while the water is in the process of freezing it is observed that is solidifies .

What is the process of freezing?

The process through which a substance transforms from a liquid to a solid is known as freezing.

When a liquid's molecules slow down enough to attract one another into permanent positions as a solid, this process is known as freezing.

When water freezes, energy is emitted into the environment, which leads energy to be lost and causes the environment to "cool down".

Since it is not thought to exist, the term "cooling" is not well understood in chemical research and would instead be substituted by the phrase "absence or loss of heat."

When a body's temperature drops, it is said to be cooling. If the temperature drops further, as it would with water, it would ultimately approach the freezing point, which for water is 0 degrees Celsius.

As a result, when cooling passes this thermal barrier, the water "freezes." The freezing point of pure water is 0 degrees Celsius. 

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We will see that rock would hit the ground first and cotton would hit later,

when we perform the same experiment in vaccum, then both will hit the ground at the same time.

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Answer:

Fe2O3 + 2Al -> 2Fe + Al2O3

Answer:

Their mass stays the same but their weight changes.

Explanation:

The gravitational force of celestial bodies is determined by their mass and size. The moon has less mass than the Earth and can't pull object towards itself as well as the Earth. Thus, mass remains the same and you'd weigh less.

We need to do is to try 35% ethyl acetate to see the results.

The term chromatography has to do with the process of separation in which there is a stationary phase and a mobile phase. The stationary phase  in thin layer chromatography is the adsorbent while the mobile phase is the solvent mixture.

The solvent mixture would determine the extent of separation. We know that if the compound is polar, then we need a mixture of a polar solvent and a nonpolar solvent.

The RF of 0.9 implies that the separation was minimal. Thus, what we need to do is to try 35% ethyl acetate to see the results.

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Missing parts;

you use 25% ethyl acetate (an ester) in hexane to run a tlc and obtain a single round spot with an rf of 0.9 for the main compound. what would you do?conclude that the sample is pure.assume that tlc will be useless and find a different way to see if the sample if pure.try a completely different set of solvents, as ethyl acetate and hexanes will never work.try 10% ethyl acetate to see the results.try 35% ethyl acetate to see the results.

The pollution in a watershed have such a heavy impact on its inhabitants because  the water combines and the pollutants become more concentrated.

Pollution is defined as the introduction of harmful material to the environment. These harmful material is called pollutant.

Pollutant can be natural such as volcanic ash. They can also be created by human effect.

There are four types of pollution

Thus, the pollution in a watershed have such a heavy impact on its inhabitants because  the water combines and the pollutants become more concentrated.

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The specific volume of diatomic nitrogen is 13.37 ft³/lb by mass and 0.0265 m³/mol by mole.

1) m(N2) = 1 lb; mass of diatomic nitrogen

V(N2) = 100 gal = 13.37 ft³; volume of diatomic nitrogen

The standard unit for specific volume is cubic meters per kilogram or cubic feet per pound (ft³/lb).

ν = V / m; formula used to calculate specific volume (ν) by mass

ν = 13.37 ft³ / 1 lb

ν = 13.37 ft³/lb; specific volume by mass

2) M(N2) = 28 g/mol = 0.070 lb/mol; molar mass of diatomic nitrogen

n(N2) = 1 lb / 0.070 lb/mol

n(N2) = 14.29 mol; amount of diatomic nitrogen

ν = V / n; formula used to calculate specific volume (ν) by mole

ν = 13.37 ft³ / 14.29 mol

ν = 0.936 ft³/mol = 0.0265 m³/mol; specific volume (ν) by mole

The molar volume has the SI unit of cubic metres per mole (m³/mol)

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Pepsin Pearls helps digest proteins in the stomach.

Here are some important pepsin advantages:

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Initially, the Final speed of a molecule of an ideal gas is 327 m/s. the pressure and volume of this gas are kept constant, while the number of molecules is doubled.

The square root of the mean of the squares of the velocity of individual gas molecules is known as the root mean square velocity (RMS value).

T = Kelvin-degree temperature.

The arithmetic mean of the velocities of various gas molecules at a specific temperature is known as average velocity. Actually, root mean square speed, not velocity, is what the RMS calculation tells you.

Considering that velocity is a vector quantity with both magnitude and direction, this makes sense.

The behavior pf the molecule is given by -

PV = 2/3 N (1/2mv²)

We may write p1v1 = p2v2,

where the subscript 1 denotes the beginning condition

subscript 2 denotes the conditions following the number of molecules being doubled, because the pressure and volume of the gas are held constant while the number of molecules is doubled. Thus,

⇒ 2/3 [N1 (1/2 mv1²)] = 2/3 [N2 (1/2 mv2²)]

⇒ N1 v1² = N2 v2²

⇒ v2 = v1 √(N1/N2)

⇒ v2 = 463 √(N1 / 2N1)

⇒ v2 = 463 / √2

⇒ v2 = 327m/s

Thus, the final speed of the molecules is 327 m/s.

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All of the glassware do not measure with the same degree of accuracy.

A glassware is an apparatus that could be used for measurement. Most of the glassware are used for the measurement of fluids. In this case, we can see that the kinds of glass ware that could be used for measurement in the laboratory are; Burette, pipette, measuring cylinder etc.

The calibration of all the glassware are not the same, recall that there must always be a measure of uncertainty that goes with the instrument that is used in measurement.

Having known this, we can see that all of the glassware do not measure with the same degree of accuracy.

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Vinegar has preservative and antimicrobial properties due to the ability of the active ingredient to cross the membrane as CH₃COOH. Once in the cytoplasm, it becomes Deprotonated.

Vinegar is a natural preservative. It enhances the microbiological safety and extending the life. Production of vinegar is a two step process , where yeasts convert sugars into alcohol, followed by acetobacter, which oxidise alcohol to acetic acid.

Vinegar is a crude acetic acid and possess antimicrobial properties, which kills microorganisms and enhance microbiological safety of food.

Deprotonated simply means the removal of a proton from a chemical compound. The acetic acid in vinegar cross the membrane and become deprotonated, i.e., removal of proton in the cytoplasm which disturbs the normal pH.

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The PH range of the effective buffer of NAHC2O4 is 3.5-5.2

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Answer:

6.5  x  (  6.02x 10^23)=  3.913  x10^24

Explanation:

The answer would be the competitive inhibition, the inhibitor competes with the substrate for binding to the active site, but does not covalently modifying the active site.

In competitive inhibition, the inhibitor (I) firmly be like the actual substrate (S), and is considered as a substrate analogue. The inhibitor takes part with substrate and cohere at the active site of the enzyme but does not go any catalysis. As long as the competitive inhibitor hold on to the active site, the enzyme is not present for the substrate to cohere. A competitive inhibitor vanished the rate of catalysis by lessen the portion of enzyme molecules to a substrate. At any given inhibitor concentration, competitive inhibition can be pleased by expanding the substrate concentration.

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A decrease in pH means a rise in positively charged H+ ions, and a rise in the electrical gradient across the membrane. The transport of amino acids into the cell will increase.

How do amino acids move across the cell membrane?

The amino acids are diffused across the cell wall by facilitated diffusion with the help of symporter proteins present in the plasma membrane. These also are called sodium-dependent amino acid transporters.

What do the cells do with the amino acids?

The gastrointestinal system breaks all proteins down into their amino acids so that they can enter the bloodstream. Cells then use the amino acids as building blocks to create enzymes and structural proteins.

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The products of the reaction are (2r,3r) - dibromobutane and (2s,3s)-dibromobutane

Halogenation is a chemical process in which one or more halogens are added to a substance. Due to the widespread presence of halide-containing chemicals, this type of transformation is crucial for producing polymers and pharmaceuticals, among other things.

When a material gets brominated, the chemical reaction causes bromine to be added to the compound. The result's qualities after bromination will be different from the initial reactant.

The bromination of cis - but - 2 - ene is the reaction described. Two items are produced as a result.

Reaction:

cis - but - 2 - ene + Br₂ → (S, S) - 2,3 - dibromobutane + (R, R) - 2,3 - dibromobutane

When cis - but - 2 - ene is reacted with bromines the products of the reactions are ( 2S, 3S) - dibromobutane and ( 2R, 3R ) - dibromobutane, respectively.

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Water in a 150 ml container volume with a diameter of 12 cm evaporates faster and therefore has a greater vapour pressure than a container with a volume 75 ml and a diameter of 5.5 cm, because the diameter of 150 ml container is more and more space is exposed, so it evaporates more quickly in lesser time.

The vapour pressure is due to escaping tendency of water molecule from surface of liquid. Vapour pressure is dependent on the number of molecules on the surface of liquid.

If number molecules on surface of molecules is greater, greater would be the vapour pressure.

Since, 150 mL container is with 12 cm diameter, its surface area is larger and it has more number of water molecules on the surface. So, it has greater vapour pressure than the 75 ml container and the water also evaporates faster due to large surface area and more exposure.  

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Lipids, nucleotides, amino acids, and monosaccharides are the proper answers as to which molecules are present in some of the meteorites that have been studied.

Rocks or metal fragments from space are referred to as meteorites because they fall to earth. Some scientists, particularly those looking to support or refute the Panspermia idea, which holds that life originated from other planets, have investigated and analyzed these rocks and metals in great detail.

Lipids, nucleotides, amino acids, and monosaccharides are thus the proper answers to the compounds discovered in several meteorites.

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a) Ch +2, and H2O 0 so complex has 2+

b) Fe +3 and CO3-6 so complex has -3

c)  V +3, H2O 0, Cl -1 so complex has -1

What is meant by complex charge?

A charge transfer complex, also known as the electron donor acceptor complex, is a grouping of two or more molecules or of several chemical components where some electronic charge is transmitted between the molecular entities.

A complexion or coordinating entity's charge number refers to the net charge it carries.

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