Photoionization processes (e.g., N2 +hν → N2+ + e-) remove UV of <150 nm. Which photoreaction is the principal absorber of UV in the 150-200 nm range in the upper atmosphere?
a) N2 + hv ->2N
b) O2 + hv -> 2O
c) O3 + hv -> O2 + O
d) N2 + O2 + hv -> 2NO
e) NO + O2 + hv -> NO3

1. Sodium bicarbonate is added during the work-up phase because it helps in converting any residual acetic anhydride into acetic acid and neutralizes the unreacted salicylic acid.

Sodium bicarbonate is an effective pH neutralizer. In the preparation of aspirin, after the completion of the reaction, hydrochloric acid is added to lower the pH of the reaction mixture to about 2. At this point, aspirin precipitates as it is relatively insoluble in water. After filtration, the crude product is dissolved in hot water. At this stage, sodium bicarbonate is added to neutralize the acidic impurities like the acetic acid that is produced in the reaction. The impurities become soluble and easily removed from the solution.

2. The complete reaction mechanism for the preparation of aspirin is:

3. The crystals are washed with cold water during the first filtration to remove any impurities that may be present. Coldwater is used to prevent the solubility of aspirin in water. This makes it easier to remove any water-soluble impurities and unreacted salicylic acid that may be present.

4. The percent yield of the reaction is calculated by dividing the actual yield obtained by the theoretical yield that is calculated from the stoichiometry of the reactants involved in the reaction. Factors such as incomplete reactions, losses during filtration, and errors in measurement can all contribute to a lower yield. Therefore, the yield may be less than 100%.

5. The melting point of the newly synthesized aspirin should be around 136-140 °C if the reaction was successful. A lower melting point may be an indication of impurities in the final product. The impurities could be from an incomplete reaction, the presence of water or unreacted salicylic acid.

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Glucose in urinalysis  measures the amount of glucose in your urine. It may be used as a screening test for diabetes.

Normally, urine contains very little or no glucose. But if you have too much glucose in your blood, your kidneys will get rid of some of the extra glucose through your urine. So, a high level of urine glucose may mean that your blood glucose is usaully high, too, and that could be a sign of diabetes. If your urine glucose level is high, your health care provider will usually order a blood glucose test to help make a diagnosis.

Glucose in urine test measures the amount of glucose in your urine. Glucose is a type of sugar, that is the main source of energy for the cells in your body. Your blood carries glucose to your cells.

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The density of the piece of metal is 2.12g/mL

HOW TO CALCULATE DENSITY:

Density (g/mL) = mass (g) ÷ volume (mL)

Density = 23.5/11.1

Density = 2.12g/mL

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Explanation:

300c = 1.8f+32= please calculate it yourself ☺

300c= k+273= 573k

Answer:

AgF (aq) + KNO₃ (aq) → AgNO₃(aq) + KF(aq)

Explanation:

AgF (aq) + KNO₃ (aq) →

The products from the equation above can be obtained as follow:

1. AgF and KNO₃ will dissociate in solution as shown below:

AgF (aq) —> Ag⁺(aq) + F¯(aq)

KNO₃ (aq) → K⁺(aq) + NO₃¯(aq)

2. A double displacement reaction will occur between AgF and KNO₃ as illustrated below:

AgF (aq) + KNO₃ (aq) →

Ag⁺(aq) + F¯(aq) + K⁺(aq) + NO₃¯(aq) → Ag⁺NO₃¯(aq) + K⁺F¯(aq)

AgF (aq) + KNO₃ (aq) → AgNO₃(aq) + KF(aq)

A careful observation of the above equation shows that the equation is balanced.

Answer:

the microwave energy converts to heat energy to cook the food.

Explanation:its simple

Answer:

A microwave oven converts electrical energy into radiant energy (which is converted to thermal energy), and a television converts electrical energy into sound energy and radiant energy.:

The Elution sequence of compounds containing certain functional groups from the fastest to the slowest is hydrocarbons, olefins, ethers, halo carbons, aromatics, ketones, aldehydes, esters, alcohols, amines and acids.

Elution:

Elution in organic and analytic chemistry refers to the process in which one material is extracted from another material by washing it with the help of a solvent.

In an elution sequence, regardless of the polarity of the compounds, the solvent which is more polar, its chemicals elutes faster. Therefore, amending the polarity of the solvent will not change the order of elution of compounds. It might seem contradictory as a polar solvent seems to convey polar compounds beyond the non-polar compounds.

Contemplating the solvents and the chemicals will fight for the stationary phase locations conductive to help us visualize the intention. Slow elution would be created by the molecules which were remained to attach to the stationary phase due to poor ability of a less polar solvent to compete. Molecules and a polar solvent successfully asserted for the stationary phase locations.

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CSS3 introduces a new type of color notation, the rgba and hsla values. The rgba value stands for 'red, green, blue, alpha' and specifies a color with an alpha channel which is used to control the opacity of the color.

The hsla value stands for 'hue, saturation, lightness, alpha' and allows you to specify a color in terms of its hue, saturation, lightness and alpha. Using these two color notation types, you can create more vibrant, visually captivating web designs.

You can also create color gradients and transparencies which were difficult to achieve before. With rgba and hsla, you can easily mix and match colors to create the exact design you have in mind. They provide an excellent way to customize the look and feel of a website and make it truly unique.

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In consideration of Henry's law the molar mass of organic compound is 0.24 grams.

The molar mass of a chemical compound defined as the mass of a sample of that compound devided by the amount of substance which is the number of moles in that sample,measured in moles.

Sol-One of three asks what the mass of water is in grams and two and 1/2 liters of paper of Equis, 12.5% sodium chloride, fifty five°C. This problem tells us that pure H2O is one hundred eighteen  tour at fifty five*° C.So the first thing that we have to do here is figure out wth e um, the mole fraction of thermal fractions, I suppose, of both sodium chloride and water.

We know those 2.5 liters. We're looking for this number of moles here. Ideal gas constant 0.8 to 6 leader atmospheres over mole Calvin. And then we have to convert, um, Celsius, the 55 degrees C to Calvin. So we always rmember that simply 55 degrees Celsius plus two year and 73 which gets US 328 Calvin. So solving all of that for the number of moles, then that gives us 0.133 off water and 2.5 liters of vapor. So last step, then, is to just convert that to Graham's, since the problem asks for a mass and not by the number moles. So you can plug that, , basically into, uh, the molecular by it it and it does weight of water, just 18.2 grand's for mold. And that gives us keeping significant figures in mind. 0.24 grams.

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Option C. Decomposition reaction: a substance involved is oxygen.

A decomposition reaction is a type of chemical reaction where a single compound is broken down into two or more simpler substances. In the reaction, energy is typically used to break down the bonds that hold the molecules of the compound together. Oxygen is often a substance involved in the reaction, as it is used to provide the energy needed to break down the compound. When oxygen is involved, the reaction is sometimes referred to as an oxidation reaction.

Since the question is not complete, here's the full task:

Which of the following statements correctly identifies the decomposition reaction and describes a substance involved?

Choose the right option:

A. Combustion reaction: a substance involved is oxygen

B. Combustion reaction: a substance involved is a hydrocarbon

C. Decomposition reaction: a substance involved is oxygen

D. Decomposition reaction: a substance involved is a hydrocarbon

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The process of breathing involves exchanging oxygen for carbon dioxide gas.

The process of breathing involves inhalation and exhalation.

Inhalation is the process of taking in oxygen and Exhalation is the process of taking out carbon dioxide. Air contains 21 % oxygen and 71 % nitrogen and 8 % other gases.

When we breathe in(inhalation) our diaphragm contracts downward while during breath out(exhalation) our diaphragm contracts upward. As food and water are important for us in similar way breathing is also essential for life.

So during the process of breathing, we take in oxygen and take out carbon dioxide.

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Answer: D- a hockey puck slides toward the goal

Explanation:

It needs to be able to slide easily and thats the correct answer on the test

The excess mass is 13.0g is the excess is left over when 16.2g so2 reacts with 13.7g pcl5.

The discrepancy between a nuclide's actual mass and its mass number in atomic mass units is known as the mass excess. It is one of the most used ways to calculate nuclear mass.

Given:

SO₂  + PCl₅ ------->  SOCl₂   + POCl₃

Given, the mass of SO₂ = 16.2g.

Given, the mass of PCl₅ = 13.7g.

And the molar mass of SO₂ = (32+2x16)

                                       64 g/mole.

PCl₅ =( 31+35.5x5) 208.5 g/mole.

Moles = given mass / molar mass.

Moles (SO₂ ) = Given mass / molar mass

       16.2 / 64 = 0.25 moles.

Moles( PCl₅) = given mass / molar mass

   13.7/208.5 =0.06 mole.

Hence, moles of  SO₂ are in excess amount

Excess moles of SO₂  = 0.25 - 0.06

                                         0.19 moles.

Therefore, excess mass of SO₂ is =  0.19 x molar mass of SO₂

Excess mass of SO₂ is = 12.2 g \approx 13.0 g

Thus, the excess mass of SO₂ is 13.0g

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Answer:

Kinetic energy is transferred from the leg to the ball

Explanation:

Before kicking the ball, you'll need to run to where the position of the ball is which implies that your leg is not at rest, immediately you kick the ball, you will be transferring the kinetic energy of your leg to the ball.

Answer:

no thanks

Explanation:

Answer:

I'd be down.

Explanation:

Butane can exist in different conformations, including the staggered and eclipsed conformations. In this case, we are considering the wedge and dashed conformations.

Butane, a four-carbon alkane, can undergo rotations around its carbon-carbon bonds, resulting in different conformations. The most common conformations of butane are the staggered conformations. The staggered conformations can further be classified into different types based on the orientation of the methyl groups.

Conformation 1: The wedge conformation is a type of staggered conformation where the larger substituent(s) point out of the plane of the paper, and the smaller substituent(s) point into the plane of the paper. In the case of butane, the wedge conformation has a methyl group pointing up and a methyl group pointing down. This conformation is classified as an anti conformation.

Conformation 2: The dashed conformation is another type of staggered conformation where the larger substituent(s) point into the plane of the paper, and the smaller substituent(s) point out of the plane of the paper. In the case of butane, the dashed conformation has a methyl group pointing up and a methyl group pointing down. This conformation is also classified as an anti conformation.

Conformation 3: The third conformation is an eclipsed conformation where the methyl groups are aligned with each other. This conformation is classified as a gauche conformation because the methyl groups are slightly twisted or skewed with respect to each other. The gauche conformation is less stable than the anti conformation due to steric hindrance between the methyl groups. It is important to note that the eclipsed conformation can exist in two forms: the fully eclipsed conformation, which is the most unstable, and the partially eclipsed conformation, which is slightly more stable than the fully eclipsed conformation.

Butane can exist in various conformations, including the staggered and eclipsed conformations. The wedge and dashed conformations are examples of staggered conformations, with the methyl groups arranged in an anti conformation. The eclipsed conformation, specifically the gauche conformation, involves the alignment of the methyl groups but with some twist or skew. These conformations demonstrate the different spatial arrangements of the methyl groups in butane, affecting the stability and interactions between atoms.

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Answer:

If there were multiple products, we can take each product and mixed with a sample of a pure compound that we suspect might be the same as the product. Then, we taking the melting point of this mixture that contains one of our product and pure sample. Then, we can observe the change in melting point, if there is no change in melting point or the melting stays in the same range of the pure compound. Then, the that product along with the pure sample are actually the same compound, not a mixture of two compounds. However, if the melting point for our pure sample compound changed or didn't stay in the same range after the mixing with on of our products. then we can conclude that this product and the pure sample are completely different compound, and indeed they are a mixture.

Answer:

1.4 moles/ 2.0 L= 0.7 M

Explanation: Molarity= moles of solute/ Liters of solution

therefore just plug the numbers in and you'll find the molarity to equal. 0.7

Answer:

can u give us the options

Answer:

2S02 + O2 ---> 2SO3

Its balanced now as Reactants = Products.

Answer:

its A.) birth to two years

Answer:

Thermal, is mainly the heat trapped or in an object, such as a boiling water over a stove, its trapped and countinues to get hotter

Heat is basically the releasing of the energy that is contained in an object.

Thermal is the objects temperature, while heat is the Thermal energy that is released.

Explanation:

Answer:

So, to convert between moles and grams, use the molar mass of the two compounds. If one mole of carbon monoxide has a mass of 28.01 g and one mole of carbon dioxide has a mass of 44.01 g , it follows that the reaction produces 44.01 g of carbon dioxide for every 28.01 g of carbon monoxide.

Answer:

2.99

Explanation:

:)

Answer:

Because the scientific knowledge itself helps solve many basic human needs and it also improves how humans live and their standards. For example, without science medications wouldn´t exist and many technological devices we use now-a-days. We´re surrounded by science, we just don´t really notice it.

.......................yes...............ofc.......

Answer:

creo q es electrico

Explanation:

An amine that is insoluble in water can be made to dissolve by adding it to an aqueous solution of NaOH.

Therefore, option b. NaOH is correct option.

An amine is an organic compound with the formula RNH2 or R2NH or R3N, where R is an alkyl or aryl group. Amines are a type of derivative of ammonia, with one or more hydrogen atoms replaced by organic substituents.

Amines are classified as primary, secondary, or tertiary depending on the number of substituents attached to the nitrogen atom. Furthermore, they are weak bases, with aqueous solutions having pH values greater than 7 because of the presence of the amino group. When amines dissolve in water, they can act as either Bronsted-Lowry bases or Lewis bases. However, most amines are insoluble in water.Water-soluble amines Amines, despite being basic compounds, are often insoluble in water, which is a polar solvent.

As a result, they may be made water-soluble by reacting with acids. For instance, when an amine is added to an aqueous solution of hydrochloric acid, the amine ionizes and dissolves in the acidic solution. Water-soluble salts, such as ammonium chloride, are formed. Other acid-based techniques for making amines water-soluble include reacting them with sulfonic acids and oxoacids. Amines with low molecular weight are also soluble in water because they can form hydrogen bonds with water molecules.Solubility in water may be achieved by adding an amine to an aqueous solution of NaOH, which serves as a base, neutralizing the amine and making it soluble. Water-insoluble amines are converted to water-soluble compounds when they react with NaOH.

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Answer:

the 4th one

Explanation:

kinitc energy formula is1/2mv^

there is mass ,and velocity (speed)

I hope it help

Answer:

Explanation:

Speed and position