which statement is true of water's tensile strength? which statement is true of water's tensile strength? (a) it results from hydrogen bonding. (b) it helps to pull water through plants. (c) it involves both cohesion and adhesion. both (a) and (b). (a), (b), and (c).

Answer:

Explanation:

The number of electrons that can have a specific set of quantum numbers in an atom is determined by the following formula:

2(2ℓ + 1)

where ℓ is the azimuthal quantum number.

So, for n = 8 and ℓ = 2, the number of electrons that can have these quantum numbers is given by:

2(2 * 2 + 1) = 2 * 5 = 10

Therefore, 10 electrons in an atom can have the quantum numbers n = 8 and ℓ = 2.

1,3 diiodo propane is formed when oxetane is heated at reflux.

Reflux is defined as the process which involves heating the chemical reaction for a specific amount of time, while continually cooling the vapor produced back into liquid form, using a condenser. The vapors that are produced above the reaction continually undergo condensation, returning to the flask as a condensate.

Oxetane is a stable carbon compound which shows characteristic properties when reacted with conc. acids. When oxetane reacts with HI it gets reduced to form 1,3 diiodo propane which is also an organic compound.

Therefore, when oxetane is heated in excess amount of concentrated HI, the product formed is 1,3 diiodo propane.

The reaction is given in the image attached below.

The given question is incomplete and the completed question is given below.

Draw the structural formula(s) for the organic product(s) formed when the following compound (OXETANE) is heated at reflux in an excess of concentrated (HI) .

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36.47% of the mass of iron (II) sulfide is sulfur. If 87.91 g of iron sulfide is produced by reacting iron with sulfur, the amount of iron that was reacted is 87.91 g Fe(II) sulfur multiplied by 63.53% Fe (II) equals 55.85 g Fe (II)

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The final product is 1-butanol.

The given reaction is the addition of a Grignard reagent, CH₃CH₂MgBr, to a carbonyl compound.

The mechanism for the reaction is a nucleophilic addition. The mechanism can be broken down into three main steps:

Step 1: Nucleophilic attack

The carbon atom in the carbonyl group has a partial positive charge, making it an electrophile. The carbon atom in the Grignard reagent has a partial negative charge, making it a nucleophile. The nucleophilic carbon attacks the electrophilic carbon of the carbonyl group, forming a tetrahedral intermediate.

             H

             |

  H₃C     C      O

             |

             CH₃

               -

               |

        CH₃CH₂MgBr

Step 2: Protonation

The tetrahedral intermediate is unstable and collapses. In this step, an acid, such as H₃O⁺, protonates the oxygen atom, which forms an alcohol.

             H

             |

  H₃C     C      OH

             |

             CH₃

               -

               |

        CH3CH2MgBr + H3O+

Step 3: Deprotonation

In the final step, a base, such as water, removes a proton from the protonated alcohol to form the final product, which is a neutral alcohol.

             H

             |

  H₃C     C      OH

             |

             CH₃

                  |

                  H

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bonds are the only primary bonds that are directionally dependent. Materials whose constituent particles are bound by bonding are generally expected to have the lowest melting temperatures

The correct options to fill in the blanks are is a)covalent bond.

• Bonding is similar to covalent bonding, except there are no high-electronegativity atoms present to accept any electrons that the present atoms are willing to donate.

• Covalent bonds are responsible for binding atoms together within a molecule of propane, whereas van der Waals bonds bind separate propane molecules together in a condensed state (liquid or crystal).

• Covalent bonds are the only primary bonds that are directionally dependent.

• Materials whose constituent particles are bound by metallic bonding are generally expected to have the lowest melting temperatures.

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The following are the result, which shows on which system work is done under pressure or not:

1. [tex]NaHCO_{3} (s) + HC_{2} H_{3} O_{2}(aq)[/tex] ⟶ [tex]NaC_{2} H_{3} O_{2} (aq) + H_{2} O(l) + CO_{2} (g)[/tex]

Answer: Work done by the system

2. [tex]2H_{2} O_{2} (g)[/tex] ⟶ [tex]O_{2} (g)[/tex] + [tex]2H_{2} O(g)[/tex]

Answer: No work done

3. [tex]N_{2} (g)[/tex] + [tex]3H_{2} (g)[/tex] ⟶ [tex]2NH_{3} (g)[/tex]

Answer: Work done on the system

4. [tex]H_{2} (g) + F_{2} (g)[/tex]⟶ [tex]2HF(g)[/tex]

Answer: No work done

1. [tex]NaHCO_{3} (s) + HC_{2} H_{3} O_{2}(aq)[/tex] ⟶ [tex]NaC_{2} H_{3} O_{2} (aq) + H_{2} O(l) + CO_{2} (g)[/tex]

An aqueous solution of [tex]NaC_{2} H_{3} O_{3}[/tex], liquid water, and gaseous [tex]CO_{2}[/tex] is created in this reaction between the solid [tex]NaHCO_{3}[/tex] and the liquid [tex]HC_{2} H_{3} O_{2}[/tex]. As the reaction generates a gas, it will expand against the environment and alter it. Therefore, the system does work.

2. [tex]2H_{2} O_{2} (g)[/tex] ⟶ [tex]O_{2} (g)[/tex] + [tex]2H_{2} O(g)[/tex]

In this process, hydrogen peroxide gas is broken down into oxygen gas and water vapour. As this is a gas-phase reaction, neither the system nor its surroundings will significantly expand nor contract. As a result, no work is done.

3. [tex]N_{2} (g)[/tex] + [tex]3H_{2} (g)[/tex] ⟶ [tex]2NH_{3} (g)[/tex]

In this process, nitrogen gas and hydrogen gas are used to create ammonia gas. The reaction will cause the system's volume to drop since the reaction reduces the number of gas molecules from 4 to 2 in the first place. The environment will strive to compress the system. As a result, the system is under construction work done by a system.

4. [tex]H_{2} (g) + F_{2} (g)[/tex]⟶ [tex]2HF(g)[/tex]

In this process, fluorine gas and hydrogen gas are used to create hydrogen fluoride gas. This reaction does not involve any major expansion or compression of the system or its surroundings since the quantity of gas molecules does not change. As a result, no work is done.

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The full  name of the compound B₂F₂ is diboron difluoride as it has 2 boron and fluorine atoms.

Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.

Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:

1)Molecular compounds where in atoms are joined by covalent bonds.

2) ionic compounds where atoms are joined by ionic bond.

3)Inter-metallic compounds where atoms are held by metallic bonds

4) co-ordination complexes where atoms are held by co-ordinate bonds.

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molar mass of KNO3 = 39.1 g/mol (K) + 14.0 g/mol (N) + 3x16.0 g/mol (O)

                                  = 101.1 g/mol

moles of KNO3 = 70.5 g / 101.1 g/mol

                          = 0.697 mol

mass of solution = mass of KNO3 + mass of water

                            = 70.5 g + (1.97 L x 1.05 g/mL)

                              = 70.5 g + 2.067 g = 72.567 g

volume of solution = 72.567 g / 1.05 g/mL

                               = 69.105 L

Molarity = 0.697 mol / 69.105 L

             = 0.0101 M

mass of solvent = mass of solution - mass of solute = 72.567 g - 70.5 g

                              = 2.067 g

mass of solvent = 2.067 g / 1000 g/kg

                           = 0.002067 kg

Molality = 0.697 mol / 0.002067 kg

                = 337.2 mol/kg

Mass percent = (70.5 g / 72.567 g) x 100%

                        = 97.16%

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These attractions are called: hydrogen bonds. Option D is the correct answer.

This refers to is a special type of dipole-dipole attraction between molecules, not a covalent bond to a hydrogen atom. It results from the attractive force between a hydrogen atom covalently bonded to a very electronegative atom such as a N, O, or F atom and another very electronegative atom.

Hydrogen bonds are strong intermolecular forces created when a hydrogen atom bonded to an electronegative atom approaches a nearby electronegative atom. Greater electronegativity of the hydrogen bond acceptor will lead to an increase in hydrogen-bond strength.

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Answer:

B. Cornstarch

Explanation:

Iodine reacts with some substances and changes color as a result of the reaction. Out of the items listed:

B. Cornstarch will react with iodine and produce a blue-black color. This reaction is due to the presence of starch, which reacts with iodine to form a complex molecule called iodine starch.

A. Baking soda, also known as sodium bicarbonate, does not react with iodine and will not cause a color change.

C. Salt, also known as sodium chloride, does not react with iodine and will not cause a color change.

D. Powdered sugar, also known as sucrose, does not react with iodine and will not cause a color change.

The diagram B  represents electromagnetic energy with the longest wavelength.

What is wavelength ?

The Greek letter lambda (λ), which represents wavelength, is frequently used. When describing modulated waves, their sinusoidal envelopes, or waves created by the interference of several sinusoids, the term wavelength is also occasionally used.

What is electromagnetic energy ?

Radiant energy called electromagnetic energy moves in waves at the speed of light. It can also be referred to as radiant energy, light, electromagnetic waves, electromagnetic radiation, or the motion of electromagnetic waves. Heat can be transferred through electromagnetic radiation.

Therefore, The diagram B  represents electromagnetic energy with the longest wavelength.

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The solution becomes clear, the enzyme is denatured, and the structure of phenolphthalein is changed.

When the reaction buffer is raised to an extremely high pH, the enzyme is denatured, the solution turns clear, and the structure of the phenolphthalein in the reaction tube is altered.

When acidic or basic compounds are added, a substance is said to be a buffer if it can resist the pH change. It may neutralise minor quantities of acid or base, essentially maintaining the solution's pH. For processes and/or reactions that require a certain and constant pH, this is essential.

These tubes provide the optimum environment for small-scale biological response or suspension culture research that need for aseptic conditions with gas exchange.

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A given amount of liquid at a specific temperature would not have a fixed volume. This statement is true.

A liquid is a virtually incompressible fluid that adapts towards the shape of its container while maintaining a (near) constant volume regardless of pressure.

As such, it is a member of the four basic matter states (the others being solid, gas, and plasma) and the only one having a set volume but no fixed form. A liquid is made up of small vibrating matter particles called atoms that are bound together by intermolecular connections. A given amount of liquid at a specific temperature would not have a fixed volume. This statement is true.

Therefore, the given statement is true.

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Answer:

Explanation:

water, carbon dioxide and energy (sunlight)

The chlorophyll in the leaves of a plant traps the energy in sunlight as the sunlight strikes the leaves. option B is the correct answer.

Chlorophyll is a green pigment found in chloroplasts within plant cells, and it is responsible for absorbing light energy and using it to power the process of photosynthesis. The other options listed (roots, stem, stomata) are important parts of a plant, but they do not directly trap energy from sunlight.

Chlorophyll helps in trapping solar radiation. It helps in the absorption and assimilation of minerals from the soil. It helps in the synthesis of carbohydrates that serves as food for the entire plant.

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Answer:b

Explanation:

If a hydrogen (H) atom and helium (He) atom travel at same speed, then the following is true about de Broglie wavelengths of the atoms : C)The H atom is about 4 times longer than the He atom.

The de Broglie wavelength of particle indicates length scale at which wave-like properties are important for that particle. De Broglie wavelength is generally represented by symbol λ or λdB, where h is Planck constant.

We may apply the de Broglie wave equation λ=hmv to solve for the wavelength of the moving electron. Louis de Broglie introduced that particles, such as electrons, could be described not only as particles but also as waves.

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Answer:

8?

Explanation:

Acetanilide is an organic compound with the chemical formula C8H9NO. Its structure consists of a phenyl group attached to an amino group and a carbonyl group.

What is Recrystallization Solvent?

It involves dissolving a solid compound in a suitable solvent at high temperature, and then allowing it to cool down slowly to form pure crystals. The choice of solvent is crucial in the recrystallization process, as the solvent must be able to dissolve the solid compound at high temperature but not at low temperature, which would lead to the formation of pure crystals.

Acetanilide is a polar organic compound and is typically soluble in organic solvents such as hot ethanol, hot methanol, and hot water. These solvents are good recrystallization solvents for acetanilide because they can dissolve it at elevated temperatures, and upon cooling, the solubility of acetanilide decreases, leading to its precipitation and crystallization. The solvents are also able to dissolve impurities that might be present in the sample, so that the impurities remain in solution while the pure acetanilide crystals are formed upon cooling. Additionally, these solvents are relatively non-toxic, making them safe to use in a laboratory setting.

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A)17,300 L liters of CH3OH (FM 32.04, density = 0.791 g/mL) are required by Reaction 1 for 2.9 million liters of aquarium water.

B)192L liters of CH3OH are required by the net reaction for 2.9 million liters of aquarium water with a nitrate concentration of 8 100 uM.

C)The total volume of methanol required to denitrify 2.9 million liters of aquarium water is 22,496 L.

(a) To calculate the amount of CH3OH required for Reaction 1, we need to first determine the amount of O2 in 2.9 million liters of aquarium water.

Concentration of O2 in seawater = 220 mM

Volume of aquarium water = 2.9 million L

Amount of O2 in aquarium water = concentration x volume = 220 mM x 2.9 million L = 6.38 x 10^8 mmol

From the balanced chemical equation for Reaction 1, we see that 3 moles of O2 react with 2 moles of CH3OH. Therefore, the number of moles of CH3OH required is:

(2/3) x (6.38 x 10^8 mmol O2) = 4.25 x 10^8 mmol CH3OH

To convert this to volume, we need to use the density of CH3OH:

density = 0.791 g/mL

molar mass of CH3OH = 32.04 g/mol

volume of CH3OH = (4.25 x 10^8 mmol) x (32.04 g/mol) / (0.791 g/mL) = 1.73 x 10^7 mL = 17,300 L

(b) The net reaction for denitrification is:

5NO3- + CH3OH + 4H+ → N2 + 3CO2 + 7H2O

From the balanced chemical equation, we see that 1 mole of CH3OH is required for every 5 moles of NO3-. The concentration of nitrate in the aquarium water is 8,100 uM, which is equivalent to 8.1 mM.

Number of moles of nitrate in aquarium water = concentration x volume = 8.1 mM x 2.9 million L = 2.35 x 10^7 mmol

Number of moles of CH3OH required = (1/5) x (2.35 x 10^7 mmol) = 4.7 x 10^6 mmol

To convert this to volume, we use the same calculation as in part (a):

volume of CH3OH = (4.7 x 10^6 mmol) x (32.04 g/mol) / (0.791 g/mL) = 1.92 x 10^5 mL = 192 L

(c) The bacteria require 30% more methanol for their own growth, which means we need to add an additional 30% of the methanol required for Reactions 1-3.

Total volume of methanol required = volume from part (a) + volume from part (b) + 0.3 x (volume from part (b))

Total volume of methanol required = 17,300 L + 192 L + 0.3 x 192 L = 22,496 L

Therefore, the total volume of methanol required to denitrify 2.9 million liters of aquarium water is 22,496 L.

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54.58g of Medicine would be usual dose for a 18 month old weighing 19 pounds.

Here, given that usual dose  for children of use between 6 month to 2 year  fever, is 5 mg per kg body weight.

1 kg body weight require 5 mg dose of medicine. and are have to find out how much dose of medicine

Required for 18 month children whose weighing is 24 pounds.

So, first are convert all the data in milligram because answer is required in mg. we know that

1 pound = 0.454K2

1 kg= 100 mg

.: 24 pounds = 24X0. 454 x 100 mg

[ 1 pound = 0.454 K2 then 24 pound = 24×0.454k2. and 24x0.454g = 24×0.454 × 100 mg

Now, 10 mg body weight remise dose is 5 mg then 24x054xlos my body.

required dose of children of 18 month and weighing is 24X0.454x100 mg is = 24x0.454x100 x 5 106 = 54.48 mg.

Answer: 54.48 mg.

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A hydrate of sodium carbonate, Na[tex]_2[/tex]CO[tex]_3[/tex] has a mass of 4.31 g before heating. After heating, the mass of the anhydrous compound is found to be 3.22 g.  Therefore, The mass of water in the original sample is 1.09g.

Sodium carbonate is an inorganic compound with the formula Na[tex]_2[/tex]CO[tex]_3[/tex], where x may range from 0 and 10. All forms are water-soluble, white, unscented salts that generate alkaline water solutions. It was historically made first from ash of plants grown in sodium-rich soil.

Before heating, a hydrates of sodium carbonate, Na[tex]_2[/tex]CO[tex]_3[/tex], does have a mass of 4.31 g. The weight of the anhydrous salt after heating is determined to be 3.22 g. The original sample contains 4.31-3.22 =1.09g of water.

Therefore, the mass of water in the original sample is 1.09g.

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Because SO2 and O2 have a 1: 0.5 stoichiometric ratio, a drop in SO3 concentration is greater than a decrease in O2 concentration.

one or more new substances are formed as a consequence of the rearrangement of the molecules or atoms of multiple substances that come into contact.

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According to solubility graph, NaCl is considered unsaturated when 40g of solute is dissolved at 40ºC.

Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.

The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.

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Answer:

Explanation:

A, B, D  not C.  It takes place in the leaves

Strontium chloride, which is used in fireworks, contains a 1:2 ratio of cations to anions.

The complete question is:

Determine the ratio of cations to anions in each, strontium chloride, used in fire works

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When a substance changes into an entirely new substance with different properties, it is called a chemical change.

A chemical change is a process where a substance undergoes a transformation that results in the formation of a new substance with different chemical and physical properties. During a chemical change, chemical bonds between atoms are broken and new ones are formed, leading to the creation of a different substance.

Chemical changes are typically irreversible and involve a release or absorption of energy in the form of heat, light, or sound. Examples of chemical changes include combustion, oxidation, and digestion. In contrast, physical changes involve a change in the physical state or form of a substance without altering its chemical composition.

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5m is the amplitude of Wave A.

What is amplitude ?

A wave's amplitude is the separation between its starting point and its maximum displacement. Frequency is the quantity of waves traveling by a certain place each second. Period is the amount of time it takes for one wave cycle to finish.

What is wave ?

An energy-conducting disturbance in a medium known as a wave is one that does not involve any net particle motion. It could manifest as elasto-deformation, a shift in pressure, electric or magnetic intensity, electric potential, or temperature.

Therefore, 5m is the amplitude of Wave A.

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Calcium is a natural element, synthetic element after calcium is technetium, element in group 7 period 5 is also technetium.

a. Calcium (Ca) is a natural element that comes from the Earth's crust. It is the fifth most abundant element in the Earth's crust and can be found in minerals such as calcite, gypsum, and limestone.

b. The first synthetic element that is listed after calcium is technetium (Tc). It was discovered in 1937 by Carlo Perrier and Emilio Segrè, who were able to produce it artificially by bombarding molybdenum with deuterons.

c. The element in Group 7 and Period 5 is Technetium (Tc). It is a synthetic element.

Technetium can only be produced artificially because most forms or isotopes of it (atoms of the same chemical element with different numbers of neutrons) have an excess of neutrons, making it very unstable.

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The percent error to 2 significant figures is 11%.

What is Titration?

Titration is a laboratory technique used to determine the concentration of a solution by reacting it with a standard solution of known concentration. The process involves adding the standard solution to the solution of unknown concentration until the reaction is complete, at which point the amount of standard solution needed to reach the endpoint is used to calculate the concentration of the unknown solution.

The relationship between pKa and Ka is given by:

pKa = -log(Ka)

Rearranging this equation, we get:

Ka = 10^(-pKa)

Substituting the given value of pKa = 4.06, we get:

Ka = 10^(-4.06) = 7.01 x 10^(-5)

The experimental Ka for benzoic acid is 7.01 x 10^(-5).

To calculate the percent error, we use the formula:

percent error = (|experimental value - accepted value| / accepted value) x 100%

Substituting the given values, we get:

percent error = (|7.01 x 10^(-5) - 6.3 x 10^(-5)| / 6.3 x 10^(-5)) x 100%

percent error = 11.19%

The percent error to 2 significant figures is 11%.

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It is TRUE that when we add salt to a pot of boiling water or sugar to a pitcher of iced tea, we expect that the solute will completely dissolve.

What is Solubility?

The concentration of the saturated solution is the solubility of a solute. The amount of solute that may dissolve in the solvent at a particular temperature is known as a saturated solution. If the solute has completely dissolved in the solvent, the mixture is said to be an unsaturated solution.

When a solute dissolves in water, the vapor pressure of the solvent decreases and because of this boiling point increases and freezing point decreases.

Therefore, the solute (salt or sugar) will dissolve completely in (solvent) boiling water.

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