lee, c. e. a. atomically thin p–n junctions with van der waals heterointerfaces. nature nanotechnology 9, 6 (2014)

Answer:

with someone or in the same place as them

Explanation:

Answer:B

Explanation:

Answer:

Fluid friction describes the friction between layers of a viscous fluid that are moving relative to each other

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Answer:

Density rectangular block = 7.47 (Approx) gm/cm³

Explanation:

Given:

Length = 8.335 cm

Width = 1.02 cm

Height = 0.982 cm

Mass = 62.3538 gm

Find:

Density rectangular block

Computation:

Volume of block = lbh

Volume of block = (8.335)(1.02)(0.982)

Volume of block = 8.3486 cm³

Density = Mass / Volume

Density rectangular block = 62.3538 / 8.3486

Density rectangular block = 7.47 (Approx) gm/cm³

 We know that, Density = mass/volume Rearranging the above formula we get, Volume = Mass/Density We know the weight of silver is 1.21 kg. The volume of silver in mL is 115.278.

Converting it to grams,Mass of silver = 1210 gWe know that density of silver is 10.49 g/cm³.Volume of silver = Mass of silver/Density of silver= 1210/10.49= 115.278 cm³As the density is given in g/cm³ and we need the answer in mL, so we will convert the cm³ to mL.1 cm³ = 1 mL

Therefore,Volume of silver in mL = 115.278 mL. Answer: The volume of silver in mL is 115.278.

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The statement is FALSE. Non-ferrous metals can be hardened by heat treatment, although the mechanisms and processes involved may differ from ferrous metals.

Heat treatment techniques such as precipitation hardening can be used to increase the strength of non-ferrous metals. Non-ferrous metals are metals or alloys that do not include iron (or iron allotropes, such as ferrite, etc.) in significant quantities. Non-ferrous metals are employed because they have desired qualities like reduced weight (for example, aluminium), greater conductivity (for example, copper), non-magnetic characteristics, or corrosion resistance (for example, zinc), even though they are often more expensive than ferrous metals. In the iron and steel sectors, several non-ferrous materials are also employed. Bauxite, for instance, is used as a flux in blast furnaces, whereas wolframite, pyrolusite, and chromite are utilised to create ferrous alloys.

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The pH of a buffer solution that is 0.15 M chloroacetic acid (C2H3ClO2) and 0.10 M sodium

chloroacetate is 2.7.

Buffer Solution is defined as a water solvent based solution that is mostly consists of a mixture having weak acid and conjugate base of the weak acid, or in other word solution of a weak base and conjugate acid of the weak base.

The buffer solution always acidic or basic.

[H+] = Ka × [weak acid] / [salt] × valancy

[salt] = 0.10M

[weak acid] = 0.15M

Ka = 1.3 x 10-3

[H+] = 1.3 x 10-3 × 0.15/ 0.10

= 0.00195M

Now, as we know that

pH = -log[H+]

= -log(0.00195M)

= 2.7

Thus, we concluded that the pH of a buffer solution that is 0.15 M chloroacetic acid (C2H3ClO2) and 0.10 M sodium

chloroacetate is 2.7.

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According to the question of mass, 0.159 moles moles are in 15g of k₂O.

Mass is a scientific concept that describes the amount of matter contained in a given object or material. It is measured in kilograms (kg) and is different from weight, which is measured in Newtons. Mass is the measure of an object’s inertia and its resistance to acceleration when a force is applied. In other words, it is the amount of matter in an object, regardless of its shape or size. Mass can be determined using a variety of instruments or machines, like a balance or a scale. Mass is a fundamental property of matter and is used to calculate the weight of an object. Mass is a key concept in physics, chemistry, and engineering.

15g of k₂O is equal to 0.159 moles. This can be calculated by dividing 15g by the molar mass of k₂O (94.2g/mol): 15g/94.2g/mol = 0.159 moles.

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The forces between molecules are much stronger than the forces between ions.

➜ True

The actual relative strengths will vary depending on the molecules involved. Ionic bonding and covalent bonding will always be stronger than intermolecular forces in any given substance.

The correct ranking of the gases Kr , N₂ , CH₄ , and C₃H₈ in order of increasing density at STP is: CH₄ < N₂ < Kr < C₃H₈.

This is because at STP (standard temperature and pressure), gases behave similarly to ideal gases, which means their densities are proportional to their molar masses. The molar mass of each gas is:

- CH₄: 16.04 g/mol
- N₂: 28.01 g/mol
- Kr: 83.80 g/mol
- C₃H₈: 44.10 g/mol

So, the gas with the lowest molar mass (CH₄) has the lowest density, followed by N₂, Kr, and C₃H₈ with the highest density. Therefore, the correct ranking of these gases in order of increasing density at STP is: CH₄ < N₂ < Kr < C₃H₈.

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The following are the most critical parameters to control oxide growth: Temperature: The temperature at which oxide growth occurs is critical to the process.

The rate of oxide growth varies exponentially with temperature. For most materials, the oxidation rate doubles every 10°C increase in temperature. Ambient gas: The composition of the ambient gas and its partial pressure are critical to oxide growth. The oxygen concentration in the atmosphere affects oxide growth. The oxidation rate can be significantly reduced if the oxygen concentration is reduced or removed from the atmosphere. Metal composition: The material composition of the substrate to be oxidized has an impact on the oxidation rate.

Aluminum oxide, for example, grows more rapidly on pure aluminum substrates than on aluminum alloys. Oxidation can be significantly impacted by the presence of impurities or alloying elements.

Therefore, temperature at which oxide growth occurs is critical to the process.

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Answer:

Option C is correct

Explanation:

Covalent substances have weaker intermolecular attractions.

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The characteristic that best explains the difference in melting behaviors is

The melting point of covalent substances ( i.e. substances bounded by covalent bonding ) is lower than the melting point of ionic substances, this is because of the weak intermolecular attractions which exists in covalent compounds and this makes atoms in covalent substance to dissociate easily .

Hence we can conclude that the characteristic that best explains the difference in melting behaviors is Covalent substances have weaker intermolecular attractions.

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Chemistry is the study of substances and bonds. There are two different sorts of elements: metals and bases.

0.20 atm is the right response.

Each gas in a mixture of gases has a partial pressure, which is the notional pressure of that gas if it occupied the complete volume of the initial mixture at the same temperature on its own.

A mixture of ideal gases has a total pressure equal to the sum of its constituent gases' partial pressures.

Consider the subsequent response.

Z = W(g) + X(g) Y(g) (g)

Using an ICE chart, we can determine the partial pressure of Z at a moment we'll refer to as the equilibrium.

We label each row with the pressure or change in pressure for each of the three stages: Initial, Change, and Equilibrium.

Y(g) + Z = W(g) + X(g) (g)

I 1.20 1.60 0 0 C -x -x +x +x E 1.20 -x 1.60 -x x x

The partial pressure of W at equilibrium is 1 atm.

As a result, Z has a pressure of x = 0.20 atm.

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The pressure in the compartment would be approximately 52.29 atmospheres

The ideal gas law equation can be applied here: PV = nRT

where P is the pressure (in atmospheres or Pascals).

Volume (measured in litres)

The number of moles is n.

R = 0.0821 L atm/mol K, the ideal gas constant.

Temperature (in Kelvin) equals T.

The provided temperature must first be converted from Celsius to Kelvin:

T(K) equals T(°C) plus 273.15 K = 45.0 + 273.15 K = 318.15 K

We may rearrange the ideal gas law equation to solve for pressure if the volume is 0.050 L, we want to determine the pressure, and we have the same number of moles of N2 as in the prior situation.

P = (nRT) / V

P = (1 mol * 0.0821 L atm/mol K * 318.15 K) / 0.050 L P = 52.29 atm is the result of substituting the variables.

Consequently, 52.29 atmospheres would be the compartment's pressure.

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While cirrocumulus clouds may have some minor impact on the Earth's energy balance by reflecting sunlight, their role in the greenhouse effect is negligible compared to the greenhouse gases themselves.

Cirrocumulus clouds do not directly play a significant role in the greenhouse effect. The greenhouse effect refers to the process by which certain gases in the Earth's atmosphere trap heat from the sun, leading to an increase in the planet's temperature. The primary greenhouse gases responsible for this effect are carbon dioxide, methane, and water vapor.Cirrocumulus clouds, also known as high-level clouds, are composed of ice crystals and form at altitudes above 20,000 feet. They are thin, white, and often appear as small, rounded puffs or ripples in the sky. While these clouds can reflect some sunlight back into space, their overall impact on the greenhouse effect is minimal.In contrast, low-level clouds such as stratus or cumulus clouds can have a more significant influence on the greenhouse effect. These clouds have a higher potential to reflect incoming solar radiation and cool the Earth's surface, thus partially counteracting the warming effect caused by greenhouse gases.

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When table salt (sodium chloride which ionizes into Na and Cl) is added to alginate, a gel does not form and spherification does not occur. This happens because the salt only has one positive charge that neutralizes the negative charge in the alginate.

There are various types of Spherification. Spherification is the creation of small spheres with a thin film on the surface and a liquid center. The process of spherification is mostly used in molecular gastronomy to make small, flavorful balls of liquid ingredients that burst in the mouth when bitten into. The method involves a process of encapsulating liquid droplets in a sphere made of a gel-like film. This process requires sodium alginate (E401), a gel-forming ingredient that thickens the liquids.

Sodium alginate gelation occurs as a result of the mixture of an alginate solution with a cation solution that causes the solution to gel. The sodium ions present in the solution swap with calcium ions present in the cation solution, causing a gel to form. This occurs as a result of a chemical reaction known as cross-linking. When table salt is added to the alginate solution, a gel does not form and spherification does not occur since the salt only has one positive charge that neutralizes the negative charge in the alginate. Alginate requires a doubly charged cation to cross-link.

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The voltage is generated by the pH gradient is 221.7 mv

given that is as follows :

temperature = 25 °C

pH difference = 3.75

ideal pH electrode = 59.16 mV

pH unit change of analyte activity = 3.75× 59.16 = 221.8 mV

voltage generated :

E = (2.303 RT / nF ) ΔpH

E = ( 2.303× 8.314 × 298 / 1 × 96485 ) 3.75

E = 221.7 mV

Thus, When the difference in pH across the membrane of a glass electrode at 25 °C is 3. 75 pH units, voltage is generated by the pH gradient is 221.7 mV.

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Yes, I am agree with the evaporating dish is not preheated, then the mass of the anhydrate will be heavier, resulting in a greater value for the anhydrate and a smaller value for "z" in this formula:

CuxCly • zH2O

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The second-order diffraction angle for the emission line at 656.5 nm is approximately 52.2 degrees.

To calculate the second-order diffraction angle for the emission line at 656.5 nm, we can use the formula:
nλ = d(sinθ)
Where n is the order of diffraction, λ is the wavelength of light, d is the distance between the lines of the diffraction grating, and θ is the diffraction angle.

Since we are interested in the second-order diffraction angle, n = 2. The distance between the lines of the diffraction grating is given as 600 lines/mm, which means d = 1/600 mm. The wavelength of light emitted by atomic hydrogen is 656.5 nm.
Plugging in these values, we get:
2 x 656.5 nm = (1/600 mm) x sinθ
Solving for θ, we get:
θ = sin^-1 (2 x 656.5 nm x 600 mm) = 52.2 degrees
Therefore, the second-order diffraction angle for the emission line at 656.5 nm is 52.2 degrees.
 

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The balanced chemical equation of the reaction between sodium sulfate and water to form sodium hydroxide and hydrogen sulfate is as follows:

Na₂SO₄ + 2H₂O → 2Na(OH) + H₂SO₄

A chemical reaction is a process, typically involving the breaking or making of interatomic bonds, in which one or more substances are changed into others.

A chemical equation is a symbolic representation of a chemical reaction where reactants are represented on the left, and products on the right.

According to this question, sodium sulfate and water react to form sodium hydroxide and hydrogen sulfate. The balanced chemical equation is as follows:

Na₂SO₄ + 2H₂O → 2Na(OH) + H₂SO₄

The equation is said to be balanced because the number of atoms of each element are the same on both sides of the equation.

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Answer:

Calculate the mass of silver phosphate produced if 30.0 grams of silver acetate completely reacts with sodium phosphate.

According to stoichiometry of the balanced chemical reaction between silver phosphate and silver acetate 8.359 g silver phosphate is produced if 10 g of silver acetate is reacted with excess sodium phosphate.

It is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.

Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.In the given reaction 500.73 g of silver acetate produces 418.58 g silver phosphate, thus 10 g  silver acetate is produced when 10×418.58/500.73 =8.359 g.

Thus,  8.359 g silver phosphate is produced if 10 g of silver acetate is reacted with excess sodium phosphate.

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The equation for the dissociation of benzoic acid in water is:

C6H5COOH + H3O+ ⇌ C6H5COO- + H2O

The equilibrium constant expression for this reaction is:

Ka = [C6H5COO-][H3O+] / [C6H5COOH]

where [ ] represents the concentration of each species in mol/L.

In this equation, benzoic acid reacts with water to form its conjugate base, C6H5COO-, and hydronium ion, H3O+. The reaction is reversible, meaning that the products can also react to form the reactants. The value of Ka for benzoic acid is 6.30×10-5, which indicates that the acid is a weak acid since the value is small.

This means that benzoic acid only partially dissociates in water, forming a small concentration of hydronium ions and its conjugate base. This equilibrium constant is important in determining the pH of a solution of benzoic acid, as well as in understanding the acid-base chemistry of organic compounds.

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Answer:

N2O is an empirical formula

Explanation:

A.) P4O10   NO:  Can be reduced to P2O5

B.) C2H4    NO:  Can be reduced to CH2

C.) H2O2     NO:  Can be reduced to H O

D.) N2O     YES, the formula cannot be reduced any further.

Answer:0

Explanation: zero because it is the most stable form of oxygen in its standard state

Answer:

. Density is an intensive property, meaning that it does not depend on the amount of material present in the sample

Explanation:

In chemistry there are two kind of property that exist are Intensive property and extensive property. Density is an intensive property as it is independent of amount of matter.

Intensive property is a property that tells about the dependence of a property on Quantity of a matter over which study has been done.

Mass and volume are extensive property, these depend on the quantity of substances. Whenever two extensive property are divided then the final answer is always intensive So, density is division of mass of volume. Hence Density is an intensive property.

Example of Intensive property are specific gravity, heat capacity, melting point and boiling point . Examples of extensive property are weight and internal energy.

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Explanation:

Distinguish chemical substances from mixtures

Key Points

Matter can be broken down into two categories: pure substances and mixtures. Pure substances are further broken down into elements and compounds. Mixtures are physically combined structures that can be separated into their original components.

A chemical substance is composed of one type of atom or molecule.

A mixture is composed of different types of atoms or molecules that are not chemically bonded.

A heterogeneous mixture is a mixture of two or more chemical substances where the various components can be visually distinguished.

A homogeneous mixture is a type of mixture in which the composition is uniform and every part of the solution has the same properties.

Various separation techniques exist in order to separate matter, including include distillation, filtration, evaporation and chromatography. Matter can be in the same phase or in two different phases for this separation to take place.

Terms

substanceA form of matter that has constant chemical composition and characteristic properties. It is composed of one type of atom or molecule.

elementA chemical substance that is made up of a particular kind of atom and cannot be broken down or transformed by a chemical reaction.

mixtureSomething that consists of diverse, non-bonded elements or molecules.

Answer:

a pure substance made up of only one kind

Explanation:

Answer:

Water is a Polar Covalent Molecule

Water (H2O), like hydrogen fluoride (HF), is a polar covalent molecule. When you look at a diagram of water (see Fig. 3-2), you can see that the two hydrogen atoms are not evenly distributed around the oxygen atom.

Explanation:

Water (H2O), like hydrogen fluoride (HF), is a polar covalent molecule. When you look at a diagram of water (see Fig. 3-2), you can see that the two hydrogen atoms are not evenly distributed around the oxygen atom. Water is a polar molecule. While the overall charge of the molecule is neutral, the orientation of the two positively charged hydrogens (+1 each) at one end and the negatively charged oxygen (-2) at the other end give it two poles.

When sulfur dioxide (SO2) and nitrogen oxides (NOX) are released into the atmosphere and carried by wind and air currents, acid rain is the volcanoes.

Thus, Nitric and sulfuric acids are created when the SO2 and NOX react with water, oxygen, and other substances. Then, before hitting the ground, they combine with water and other substances.

The majority of the SO2 and NOX that contribute to acid rain originates from burning fossil fuels, however a tiny amount comes from natural sources like volcanoes.  

Thus, When sulfur dioxide (SO2) and nitrogen oxides (NOX) are released into the atmosphere and carried by wind and air currents, acid rain is the volcanoes.

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