The diels-alder mechanism between a diene and a dienophile is:

Pressures evaluated in comparison to a differential U-type manometer. For two open flasks, I and ii, different amounts of the same liquid are present in each.

Let's say a 10 cm point is used to gauge the pressure. The Differential U-type Manometer is used to calculate the difference in pressure between two pipes or sources. When two limbs of a liquid are separated vertically from its surface and each limb is connected to two different sources, a differential U-type Manometer is used to compare the pressures in the two pipes or containers that each limb is located in. Its official name is U-type Manometer. Pressure is the amount of force delivered per unit area perpendicular to an object's surface. "p" or "P" is the sign for it.

Learn more about U-type Manometer here

https://brainly.com/question/24188248

#SPJ4

Answer: the required energy is \(4.42 * 10x^{-19} J\)

Explanation:

the energy of a photon is given by the formula

Given that Temperature T = 1500 K

and the  Wavelength is =4.45 × 10^2 nm

It is because the high temperature superconductor was more affordable، easy to use and more efficient than before.

Hope it helps you...

Please mark brainliest if it helps you.

Answered by Benjemin

Electrical than Chemical

Answer:

C

Explanation:

Weak acids dissociate only slightly in an aqueous solution. The majority of molecules remain undissociated.

Answer:

A pumpkin or a deer cus it's hunting season

Birds, Scenerys, Fish, Planets, Seas, Trees, Butterflys, BTS, Fruits, Cactus! Drawing Ideas: Imagination

Draw an object and give it a face.

Create an alternate cover to your favorite book or album.

Illustrate a scene from your favorite song.

Draw a scene or character from your favorite book.

Illustrate your favorite fairy-tale.

Invent your own insects.

Draw an intricate made up flower.

Hope this helps!

Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl

To calculate the concentration of NaCl in the resulting solution in mg/L NaCl, we can use the formula; Concentration (mg/L) = (Mass of solute ÷ Volume of solution in L) × 1000 g / 1 mg NaCl is present in the stock solution of 25 mL. So, the mass of NaCl in the solution would be;0.0842 g ÷ 25 mL = 0.00337 g/mL. Now, in the resulting solution, a 1.00 mL aliquot of the stock solution is transferred to a 50.00 mL volumetric flask and diluted to volume. Therefore, the volume of the resulting solution is 50.00 mL. We will substitute these values in the formula, Concentration (mg/L) = (0.00337 g/mL ÷ 50 mL) × 1000 g / 1 mg concentration (mg/L) = 67.4 mg/L. Therefore, the concentration of NaCl in the resulting solution in mg/L NaCl is 67.4 mg/L.7.  Concentration = 67.4 mg/LTolerance = 4.28 mg/LTotal concentration = 67.4 + 4.28 mg/L = 71.68 mg/LWe round off this value to one decimal place; Total concentration = 71.7 mg/LTherefore, the concentration of NaCl in the resulting solution using propagation of error through the calculation is 67.4+0.4 mg/L.8. Two possible sources of random (indeterminate) error in the experiment are; Errors in temperature measurement. Errors in measurement of water volume. Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl.

Learn more about NaCl

https://brainly.com/question/32275922?

#SPJ11

Answer:

b. a meadow replacing a pond in it's flood plain

Explanation:

I'ts a secondary succession.

the gas sample contains roughly 0.000968 mol of moles. Together with solids, liquids, and plasmas, gases are among the four basic states of matter.

The number of moles in the gas sample can be determined using the ideal gas law:

PV = nRT

where R is the gas constant, n is the number of moles, P is the pressure, V is the volume, and T is  temperature in Kelvin.

First, we must change the temperature from Celsius to Kelvin and the volume from dm3 to m3:

T = 10°C + 273.15 = 283.15 K V = 5.0 dm3 = 0.005 m3

We can now enter the given values into the equation as follows:

PV/RT is equal to n = (2 atm)(0.005 m3)/(0.082 L atm/mol K) (283.15 K)

If we condense this phrase, we get:

n = 0.000968 mol

As a result, the gas sample contains roughly 0.000968 mol of moles.

Learn more about the gas here:

https://brainly.com/question/849648

#SPJ4

Answer:

The answer is the layer of the sun that radiates energy outwards from the sun core

Explanation:

the reason why that is becuase the convection zone is a layers which is unstable to convection. And energy is primarily or partially transported by convection

Answer:

D

Explanation:

Answer:

Metallic bond, force that holds atoms together in a metallic substance. ... The atoms that the electrons leave behind become positive ions, and the interaction between such ions and valence electrons gives rise to the cohesive or binding force that holds the metallic crystal together.

Explanation:

Answer:

the answer is b

Explanation:

i had the same question

Answer:

Convergent

Explanation:

They converge

The volume sulfuric acid will be 89.3mL.

Volume will be determined by the molarity relation. The quantity of a substance in a specific volume of solution is known as its molarity (M). The number of moles of a component per liter of a solution would be known as molarity. The molar concentration of any solution would be another name for molarity.

The volume can be calculated by using molarity formula:

\(M_{1} V_{1} = M_{2} V_{2}\)

Given data:

\(M_{1}\) = 3.50 m

\(M_{2}\) =  1.25 m

\(V_{1}\)= 250.0 ml

Put the value of given data in above formula:

\(M_{1} V_{1} = M_{2} V_{2}\)

( 3.50 m) ( 250 mL) = ( 1.25 m) \(V_{2}\)

\(V_{2}\) = 89.3mL

Therefore, the volume sulfuric acid will be 89.3mL.

To know more about volume

https://brainly.com/question/1578538

#SPJ4

The feature(s) of Compound 1 that are responsible for the pH dependence of aggregation in Equation 1 are likely the presence of acidic or basic functional groups within the molecule.

Depending on the pH of the environment, these functional groups may be protonated or deprotonated, leading to changes in the overall charge and structure of the molecule. These changes can then affect the interactions between multiple molecules of Compound 1, leading to differences in self-assembly and aggregation behavior at different pH values.
Compound 1's pH-dependent self-assembly can be attributed to the presence of ionizable functional groups in the molecule. These groups, such as carboxylic acids or amines, undergo protonation or deprotonation depending on the pH, which in turn influences the molecule's aggregation behavior (Equation 1). This change in aggregation is due to alterations in the molecule's charge, solubility, and intermolecular interactions as the pH changes.

Visit here to learn more about functional groups brainly.com/question/14618322

#SPJ11

Answer:

25,98 amu and 11.01% abundance

Explanation:

1. Find the missing abundance

100 - 78.99 - 10 = 11.01 %

2. Using each mass and abundance and the periodic table for the Mg amu

And let Isotope = Mg

23.9850(78.99%) + 24.9858(10%) + Mg(11.01%) = 24.305 (100%)

Solve for Mg

Mg = 25,98

Answer:

The substance will be in liquid state at a temperature of 97.3 °C

Note: The question is incomplete. The complete question is given below :

Suppose a substance has a heat of fusion equal to 45 cal/g and a specific heat of 0.75 cal/g°C in the liquid state. If 5.0 kcal of heat are applied to a 50 g sample of the substance at a temperature of 24°C, what will its new temperate be? What state will the sample be in? (melting point of the substance = 27°C; specific heat of the solid =0.48 cal/g°C; boiling point of the substance = 700°C)

Explanation:

1.a) Heat energy required to raise the temperature of the substance to its melting point, H = mcΔT

Mass of solid sample = 50 g; specific heat of solid = 0.75 cal/g; ΔT = 27 - 24 = 3 °C

H = 50 × 0.75 × 3 = 112.5 calories

b) Heat energy required to convert the solid to liquid at its melting point at 27°C, H = m×l, where l = 45 cal/g

H = 50 × 45 = 2250 cal

c) Total energy used so far = 112.5 cal + 2250 cal = 2362.5 calories.

Amount of energy left = 5000 - 2362.5 = 2637.5 cal

The remaining energy is used to heat the liquid

H = mcΔT

Where specific heat of the liquid, c = 0.75 cal/g/°C, H = 2637.5 cal, ΔT = temperature change

2637.5 = 50 × 0.75 x ΔT

ΔT = 2637.5 / ( 50*0.75)

ΔT = 70.3 °C

Final temperature of sample = (70.3 + 27) °C = 97.3 °C

The substance will be in liquid state at a temperature of 97.3 °C

Answer: Initially when the student spilled the bottle of ammonia the ammonia gas particles diffused with the particles of air in the room. We know that the rate of diffusion of gases is very high. So the entire room filled up with the pungent smell of ammonia.

When he opened the doors and windows and switched on the exhaust fan, the air from the room along with the ammonia gas diffused with the air outside the room.Moreover, outside air entered into the room so the concentration of ammonia gas in the room air reduced.Due to these reasons the student got relief.

The best choice of ketone to use for a crossed aldol reaction with butanal would be ketone B.

The best choice of ketone to use for a crossed aldol reaction with butanal would be ketone B. This is because ketone B has a good leaving group and is capable of undergoing the aldol reaction. The aldol reaction involves the condensation of an aldehyde or ketone with an enolate to form a β-hydroxy carbonyl compound. In this case, the enolate is derived from butanal, and the ketone is the other reactant. Ketones A and C have a poor leaving group and are not suitable for the aldol reaction. Ketones B and C have similar structures, but ketone B is more reactive due to the presence of a methyl group, which stabilizes the enolate intermediate. Therefore, ketone B is the best choice for the crossed aldol reaction with butanal.

To know more about aldol reaction visit: https://brainly.com/question/29563033

#SPJ11

Based on the table and the equation of reaction; the

The rate of a reaction is the rate at which reactants molecules are consumed or products are formed.

Based on the equation of reaction, the rate of consumption of oxygen is equal to the rate of consumption of methane.

Thus. rate of consumption of oxygen from time 20 seconds to time 60 seconds is calculated as follows:

Rate between 20 and 40 = 1.0 - 0.9/20

Rate between 40 and 60 = 0.9 - 0.85/20

Therefore, the rate of consumption of oxygen decreases with time.

Learn more about rate of reaction at: https://brainly.com/question/25724512

The addition of Ag to the saturated solution of calcium hydroxide will cause a shift in the position of equilibrium to the right, resulting in the formation of a precipitate of Ca(OH)2.

Adding Ag (silver) to the saturated solution of calcium hydroxide will result in the formation of a precipitate. This is because Ag+ ions react with OH- ions to form AgOH(s), which is insoluble in water. As a result, the concentration of OH- ions in the solution decreases, leading to a shift in the position of equilibrium to the right, according to Le Chatelier's principle.

Le Chatelier's principle states that when a system at equilibrium is subjected to a stress, it will shift to minimize the effect of that stress. In this case, the addition of Ag+ ions acts as a stress on the equilibrium. To minimize the effect of the stress, the system shifts to the right, favoring the formation of more Ca2+ and OH- ions.

As a result of this shift, more Ca2+ ions and OH- ions will be produced, and the concentration of Ca(OH)2 (s) will decrease. The solubility of calcium hydroxide decreases as a result of the reduced concentration of OH- ions. This leads to the formation of a precipitate of Ca(OH)2.

In conclusion, the addition of Ag to the saturated solution of calcium hydroxide will cause a shift in the position of equilibrium to the right, resulting in the formation of a precipitate of Ca(OH)2.

Learn more about saturated solution here:-

https://brainly.com/question/1851822

#SPJ11

Friedel crafts acylation is preferred over Friedel craft alkylation. Friedel crafts acylation reactions have many benefits as compared to Friedel crafts alkylation reactions.

Friedel-Crafts acylation and Friedel-Crafts alkylation reactions are both types of electrophilic substitution reactions that involve the formation of carbocations as intermediates. However, acylation is preferred over alkylation in certain situations.

Here are some benefits of Friedel-Crafts acylation reactions compared to Friedel-Crafts alkylation reactions:

1. Friedel-Crafts acylation reactions produce pure compounds as their major products because they do not involve any byproducts like Friedel-Crafts alkylation reactions.

2. The yields of Friedel-Crafts acylation reactions are often higher than those of Friedel-Crafts alkylation reactions.

3. Friedel-Crafts acylation reactions are more selective than Friedel-Crafts alkylation reactions because the acyl group is a better electrophile than the alkyl group.

4. The carbonyl group in the acylating agent (usually an acid chloride) can be selectively protected or modified using a variety of functional groups without affecting the aromatic ring. This is not possible in Friedel-Crafts alkylation reactions.

5. Friedel-Crafts acylation reactions can be carried out with a wider range of substrates (such as anisole or benzene) than Friedel-Crafts alkylation reactions.

6. The products of Friedel-Crafts acylation reactions are often more reactive than the starting materials, which allows for further functionalization or modification of the aromatic ring.

Learn more about Friedel-Crafts reaction - https://brainly.com/question/30861499#

#SPJ11

The molecular formula of the given sample is obtained by the ideal gas equation that is PV=nRT.

here volume given is 3.9L and pressure give n is 2 atm and temperature given is 25 C, amount of the sample given is 25 g. here we put the expression of ,  PV= nRT .then it is found to be 7.7% hydrogen and 92.3% carbon. first we should convert the percentage in to mass. so,7.7% becomes 7.7g and 92.3% become 92.3 gram. Then transform the mass into moles. so H becomes 7.7/1.01= 7.62 mole. and C becomes, 92.3/12.01= 7.69 moles. Then put all these in the relation of empirical formula and molecular formula. Then the molecular formula of the unknown gas can be obtained.

To learn more about Ideal gas equation please visit:

https://brainly.com/question/13248885

#SPJ4

Chemistry is the scientific discipline involved with elements and compounds composed of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during a reaction with other substances.

It's important to utilise immersion oil that is properly matched when employing oil aims. Use only oil that is advised by the unbiased manufacturer.

In the absence of oil, light waves bounce off the slide specimen and travel through the glass cover slip, across the atmosphere, and into the microscope lens . When a wave encounters a new substance, unless it exits at a 90-degree angle, it bends, with the amount of bend depending on the angle. The result warps the image. Oil has a more glass-like index of refraction than does air, which results in a smaller bend. Air has a considerably different index of refraction from glass. An oil-immersed lens can be almost as effective as one made completely of glass because specially prepared oil can have a refractive index that is nearly identical to that of glass (which would be impractical).

Transparent oils with particular optical properties called immersion oils.

Learn more about oil immersion here: https://brainly.com/question/8291439

#SPJ4

Answer:

A

Explanation:

bc its right

The reaction which shows the bronsted-lowry acid reacting is HCl + H₂O → H₃O⁺ + Cl⁻.

According to the Bronsted-Lowry theory, the species which donates H⁺ ion to the solution is known as Bronsted-Lowry acid and which accepts H⁺ ion is known as Bronsted-Lowry base.

Among the given reactions, only the reaction which is showing Bronsted-Lowry acid is:

HCl + H₂O → H₃O⁺ + Cl⁻

Here HCl is a Bronsted-Lowry acid as it gives H⁺ ion in the aqueous solution.

Hence, option (3) is correct.

To know more about Bronsted-Lowry acid, visit the below link:

https://brainly.com/question/1435076

The correct answer is 96.80 grams

Explanation:

The density of a substance shows the total mass the substance contains in 1 mL or 1 cm3 as density is calculated by using the formula D= M (mass) / V (volume). This implies, Iron contains 7.87 grams per milliliter. Moreover, this value and formula can be used to calculate the mass or volume of any other sample. The process to calculate the mass of an iron sample with a volume of 12.3 mL is shown below.

D = M ÷ V

7.87 mL = x ÷ 12.3 mL - x represents the missing value. Now find the value of x by solving the equation

x = 7.87 · 12.3  

x = 96.80

This means a sample of 12.3 mL contains a mass of 96.80 grams. Also, you can know this value is correct because if you divide the mass by the value the density is the same (96.80 grams ÷ 12.3 mL = 7.87 g/mL)