it is the main factor of contact metamophism.​

Answer:

Cl, C, K

Explanation:

Decreasing of electro negativity across a period is by going right to left

Answer:

Look below

Explanation:

The formula for density is:

\(Density=\frac{mass}{volume}\)

Therefore in order to find the density of a solid, you must find the mass and the volume first.

To find the mass, you can use a scale.

To find the volume, you can use the water displacement method. For example, if you fill the water of a graduated cylinder to 10 mL, and then you put a rock inside, and it rises to 15 mL, then the volume (of the rock) is 15mL-10mL=5mL.

Answer:

its D:)

Explanation:

We would need to measure out approximately 44.84 grams of C5Hg to have 0.172 mol.

To determine the grams of C5Hg needed to have 0.172 mol, we need to use the molar mass of C5Hg and the given amount in moles. The molar mass of a compound represents the mass of one mole of that compound.

The molar mass of C5Hg can be calculated by summing the atomic masses of all the atoms in the compound:

C5Hg: (5 * atomic mass of C) + (1 * atomic mass of Hg)

Using the atomic masses from the periodic table:

Atomic mass of C = 12.01 g/mol

Atomic mass of Hg = 200.59 g/mol

Molar mass of C5Hg = (5 * 12.01 g/mol) + (1 * 200.59 g/mol) = 60.05 g/mol + 200.59 g/mol = 260.64 g/mol

Now, we can calculate the grams of C5Hg needed for 0.172 mol using the mole-to-mass conversion:

Grams of C5Hg = Moles of C5Hg * Molar mass of C5Hg

Grams of C5Hg = 0.172 mol * 260.64 g/mol = 44.84 grams (rounded to two decimal places)

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Structure does not refer to how the crystal appears on the outside, but rather to how the particles are arranged within. Therefore, a crystal with symmetry of a=b≠c and α=β=γ≠90° and γ=60° is rhombohedral.

A crystal's internal repeating pattern of atoms (or molecules or ions) is known as its crystal structure. These, however, are not fully independent because a crystal's exterior appearance is frequently tied to its interior organization.

For instance, the cubic sea salt (NaCl) crystals have a cubic look on a physical level. a crystal with symmetry of a=b≠c and α=β=γ≠90° and γ=60° is rhombohedral.

Therefore, a crystal with symmetry of a=b≠c and α=β=γ≠90° and γ=60° is rhombohedral.

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Answer: It will kind of make like a type of tough or soft dough

Explanation: If you add too much water it might be a dough that bearly tays together or is very soft, but if you add too little it will be hard to mold. The reason it forms a sort of consistency like this is because When water is added to flour and mixed, these proteins absorb water, otherwise known as hydrating. Gliadin and Glutenin then combine to form the protein called GLUTEN. ... When flour is mixed with water, the gluten swells to form a continuous network of fine strands.

Inter-conversion of glucose and fructose occurs with an equilibrium constant of 1.0. Glucose isomerase catalyzes this reaction. The final concentration of fructose at equilibrium from 40mM glucose is a. 40 mM.

Using this formula to find the  final concentration of fructose

Final concentration of fructose  =Equilibrium from glucose/ Equilibrium constant

Where:

Equilibrium constant = 1.0

Equilibrium from glucose = 40 mM

Let plug in the formula

Final concentration of fructose  = 40mM / 1.0

Final concentration of fructose  =  40mM

Therefore we can conclude that the correct option is A.

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The complete question is:

Inter-conversion of glucose and fructose occurs with an equilibrium constant of 1.0. Glucose isomerase catalyzes this reaction. The final concentration of fructose at equilibrium from 40mM glucose is

a. 40 mM

b. 20 mM

c. 10 mM

d. 0 mM​

Answer:

Number of moles = 1.57 mol

Explanation:

Given data:

Mass of propanol = 94.1 g

Molar mass of propanol = 60.1 g/mol

Number of moles of propanol = ?

Solution:

Formula:

Number of moles = mass/molar mass

by putting values,

Number of moles = 94.1 g/ 60.1 g/mol

Number of moles = 1.57 mol

It is true that Light always travels in a straight line until something gets in its way.

Waves do carry energy. The energy carried by a wave is directly related to both its frequency and amplitude. Higher frequency waves have more energy, and larger amplitude waves also carry more energy.

The frequency of a wave is related to its energy, but the amplitude of a wave is not directly proportional to its energy. The energy of a wave is determined solely by its frequency, not its amplitude.

The amplitude of a wave corresponds to its maximum displacement from the equilibrium position, while the energy of a wave is determined by the number of wave oscillations or cycles per unit time, which is represented by the frequency.

Thus, the answers are true, true and false respectively.

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Answer:

1.58 g Pt

Explanation:

one mole of platinum weighs 195.09 grams (195.09 g/mol).

to convert moles of platinum to grams, we simply multiply the given moles of platinum by 195.09 to convert it to grams.

0.00808 x 195.09 = 1.576 g

0.158 moles of KMnO4 are present in 25.0 grams of potassium permanganate, KMnO4.

no. of moles = mass (g) ÷ molar mass (g/mol)

The molar mass of KMnO4 = 39 + 55 + 16(4) = 158g/mol

no. of moles = 25g ÷ 158g/mol

no. of moles = 0.158mol

Therefore, 0.158 moles of KMnO4 are present in 25.0 grams of potassium permanganate, KMnO4.

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Answer: d

Explanation:

On edg

Mole is base unit of substance. The number of particles in one mole is equal to 6.022 × 10²³. The number of particle in a mole is called as Avogadro's number.

The mole of substance is the amount of substance that contain elementary particles as the number of atoms. the symbol of mole is mol. it is the SI unit of amount of substance. The number particles are ion one mole of substances is 6.022 × 10²³. The number of particles in one mole of substance is called as Avogadro's number.

Thus, Mole is base unit of substance. The number of particles in one mole is equal to 6.022 × 10²³. The number of particle in a mole is called as Avogadro's number.

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When hydrogen bromide (HBr) is added to 2-methylbut-2-ene ((CH3)2CCHCH3), an electrophilic addition reaction takes place, where the π bond of the alkene is broken, and the hydrogen and bromine atoms are added to the resulting carbocation.

The reaction proceeds through a Markovnikov addition, where the hydrogen atom attaches to the carbon atom with the greater number of hydrogen atoms.

In this case, the initial addition of HBr to 2-methylbut-2-ene leads to the formation of a primary carbocation, as the positively charged carbon atom only has one alkyl group attached to it. The primary carbocation is relatively unstable, and it can undergo a rearrangement to form a more stable secondary carbocation.

The major product that is typically obtained is the 2-bromo-2-methylbutane. The hydrogen atom from HBr adds to the carbon with three hydrogen atoms (the more substituted carbon), resulting in the formation of a secondary carbocation.

On the other hand, a minor product is also formed, which is 3-bromo-2-methylbutane. This product arises from the addition of HBr to the primary carbocation, which is less stable. Although the primary carbocation is less favored, it can still be formed and lead to the formation of the minor product.

In summary, the addition of HBr to 2-methylbut-2-ene yields two products: the major product is 2-bromo-2-methylbutane, resulting from the addition of HBr to the more stable secondary carbocation, and the minor product is 3-bromo-2-methylbutane, originating from the less stable primary carbocation.

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306.178 liters is the volume of O2 at STP, required for the complete combustion of 125g octane (\(C_{8}H_{18}\)) to \(CO_{2}\) and H20

To calculate the volume of \(O_{2}\) required for the complete combustion of octane (\(C_{8}H_{18}\)) to \(CO_{2}\) and \(H_{2}O\) at STP (Standard Temperature and Pressure), we need to consider the stoichiometry of the balanced chemical equation.

The balanced equation for the combustion of octane is:

\(C_{8}H_{18}\) + 12.5\(O_{2}\) -> 8\(CO_{2}\) + 9\(H_{2}O\)

From the equation, we can see that 1 mole of octane requires 12.5 moles of \(O_{2}\) to completely combust. The molar mass of octane (\(C_{3}H_{18}\)) is approximately 114.22 g/mol.

To calculate the moles of octane, we divide the given mass by the molar mass:

Moles of octane = 125 g / 114.22 g/mol ≈ 1.093 mol

Since the molar ratio between octane and \(O_{2}\) is 1:12.5, the moles of \(O_{2}\)required can be calculated as:

Moles of \(O_{2}\) = 1.093 mol * 12.5 ≈ 13.663 mol

Now, we can use the ideal gas law, PV = nRT, to calculate the volume of \(O_{2}\) at STP. At STP, the temperature is 273 K, and the pressure is 1 atm.

Using the molar volume of an ideal gas at STP (22.4 L/mol), the volume of \(O_{2}\) required is:

Volume of \(O_{2}\) = Moles of \(O_{2}\) * Molar volume = 13.663 mol * 22.4 L/mol ≈ 306.178 L

Therefore, approximately 306.178 liters of \(O_{2}\) at STP would be required for the complete combustion of 125 grams of octane (\(C_{8}H_{18}\)) to \(CO_{2}\) and \(H_{2}O\)

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Explanation:

The reactant contains 2N and 6H

The product contains 2N and 6H

Therefore, the chemical equation is balanced

From the equation, for every 1 mole of N2 that reacts, 3 moles of H2 are required.

We know 28.6 grams of N2 reacted, but we don’t know the mass ratio but just the mole ratio, so we have to convert 28.6 grams of N2 to the corresponding moles of N2.

From the periodic table, the molar mass of N is about 14 g/mol, so the molar mass of nitrogen gas or N2 is two times of that which is 28 g/mol.

With this, we can calculate moles of N2, but we also need to make sure the equation is setted up the right way.

Looking at the units, if we cancel out the grams, we are left with mol. We also know that in multiplication, numerator of one number cancel with the denominator of another number and vice versa

So the equation looks like this 28.6g * mol/28g = 1.021 mol N2

So the number of moles of H2 required is 1.021 mol N2 * 3 mol H2/1 mol N2 = 3.063 mol H2 (notice that mol N2 canceled out, so the equation is set up correctly)

However, the question ask for number of grams of H2 needed, so we need the molar mass of hydrogen gas or H2, which is 1*2 = 2 g/mol

3.063 mol H2 * 2 g H2/ mol H2 = 6.126 g H2

Ans: 6.126 g H2

A wind farm can also be located offshore in most of the state.

Why in most of the state wind frames are located in offshore?

Offshore, faster wind speeds allow for substantially greater energy production. The term "offshore wind energy" describes the installation of wind farms inside of bodies of water. To produce electricity, they use the sea winds. These wind farms may employ floating wind turbines or turbines with solid foundations. Also, compared to other renewable technologies, offshore wind is more similar to onshore wind in terms of resource accessibility and technological maturity. Offshore wind farms are starting to blend into the water and coastal environment as a result.

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Answer:

0.0123 moles

Explanation:

Concentration = Moles / Volume of solution

or you can rearrange the formula to get

Moles = concentration (moles/liter)  x  volume of solution (liter)

First convert your volume to L instead of mL.  35mL = 0.035L

moles  =  0.350 moles/liter   x    0.035 liter  (liters cancel out)

moles = 0.0123

3:2

Before we can determine the mole ratio of compounds in a chemical reaction, the reaction must be balanced first.

Given the balanced chemical reactions;

Since the given reaction is balanced, we will determine the number of atom of the calcium hydroxide and aluminium hydroxide in the reaction.

There are 3 moles of calcium hydroxide at the reactant and 2 moles of aluminium hydroxide in the reaction, hence the mole ratio of calcium hydroxide to aluminum hydroxide is 3:2

Answer:

\(\lambda=3451*10^{10}m\)

Explanation:

From the question we are told that:

Energy state \(e=3.50 eV\)

Time \(t=2ms\)

Generally the equation for energy of Photon is mathematically given by

\(E=e-e_0\)

\(E=3.6*10^{-19}J\)

\(E=5.7*10^{-19}J\)

Generally the equation for Wave-length of Photon is mathematically given by

\(\lambda=\frac{hc}{E}\)

\(\lambda=\frac{6.626*10^{-34}*3*10^8}{5.76*10^{-19}}\)

\(\lambda=3451*10^{10}m\)

Answer:

SubimationImage result for The phase transition of dry ice (frozen carbon dioxide ) to gas is an example of

Sublimation

Sublimation, in physics, conversion of a substance from the solid to the gaseous state without its becoming liquid. An example is the vaporization of frozen carbon dioxide (dry ice) at ordinary atmospheric pressure and temperature. The phenomenon is the result of vapour pressure and temperature relationships.

Explanation:

The phase transition of dry ice (frozen carbon dioxide ) to gas is an example of sublimation. Hence, option D is correct.

Sublimation is the transition of a substance directly from the solid phase to the gas phase without passing through the intermediate liquid phase.

Sublimation, in physics, conversion of a substance from the solid to the gaseous state without its becoming liquid. An example is a vaporization of frozen carbon dioxide (dry ice) at ordinary atmospheric pressure and temperature. The phenomenon is the result of vapour pressure and temperature relationships.

Hence, option D is correct.

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The base dissociation constant (Kb) determines the ions of the base dissociated into the aqueous solution. Kb for CN⁻ ion will be 2.0 × 10⁻⁵. Thus, option D is correct.

The base dissociation constant (Kb) is the measurement of the ions that a base can dissociate and dissolve in the aqueous solution. The higher the value of the base dissociation constant the higher will be its basicity and strength.

The dissociation reaction of hydrogen cyanide is shown as,

HCN → H​​​​​​⁺ + CN​​​​​⁻

Given,

Ka for HCN = 4.9 x 10⁻¹⁰

The correlation between acid dissociation constant and base dissociation constant is given as,

K​​​​​​w = K​​​​​​a × Kb

Substituting values,

Kb = K​​​​​​w ÷ Ka

= (1 × 10⁻¹⁴) ÷ (4.9 × 10⁻¹⁰)

= 2.0 × 10⁻⁵

Therefore, option D. 2.0 × 10⁻⁵ is the base dissociation constant (Kb) for cyanide ions.

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Answer:

B Zn+2HCI

Explanation:

Molar concentration of Zn2+ions in a solution is 3.481 mol/lit

The electrode potential value is 59mV

Temperature=298k

What is electrode potential?

equation formed- Zn → Zn2+ + 2e

              from Nernst equation-

E=E cell - 0.059 log [Zn2+]

[zn2+]=3.481 mol/lit

hence, Molar concentration of Zn2+ions in a solution is 3.481 mol/lit

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Answer:

As gas is compressed, the individual molecules begin to move in each others way creating a very repulsive force. It acts to oppose any further volume decrease. At very close distances, all molecules repel each other as their electron clouds emerge.

Explanation:

Answer:

8.55

Explanation:

If you read the question it says the 14 k gold ring CONTAINS 8.55 G OF GOLD

There are 27 atoms in total in Cr₂(S₂O₃)5.

Atoms are the smallest possible amount of matter which still retains its identity as a chemical element and now known to consist of a nucleus surrounded by electrons.

Atoms are contained in elements. This means there are atoms in hydrogen, oxygen, chlorine etc.

According to this question, a compound with the chemical formula Cr₂(S₂O₃)5 is given. The number of atoms in this compound can be calculated as follows:

In this compound, there are;

This means that in total, 27 atoms are present in Cr₂(S₂O₃)5.

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Taking into consideration their size, impairment Weights should be positioned to enhance equilibrium and stability without compromising mobility. Wheels are angled to increase speed and maneuverability.

The speed at which an object's location changes in any direction. The distance traveled in relation to the time it took to travel that distance is how speed is defined. Since speed simply has a direction and no magnitude, it is a scalar number.

It's easy to understand why. Velocity is the pace and orientation of an item's movement, whereas speed is the tracking at which an entity is travelling along a route.

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