2. Zinc blend and wurtzite are the two important structures for semiconductors. Use {ZnS} as an example. a) Identify which crystal system they belong to respectively. b) Write the fractio

1. Gravitational lensing is the phenomenon that we call a massive object that can distort the light of more distant objects behind it.

2. WIMPs (weakly interacting massive particles) are defined as subatomic particles that have more mass than neutrinos but do not interact with normal matter.

3. The rotation curves of spiral galaxies provide strong evidence for the existence of dark matter.

4. Baryonic matter made from atoms with nuclei consisting of protons and neutrons, represents what we call ordinary matter.

5. Models show that the evolution of the universe is better-explained when we include the effects of dark matter along with the effects of luminous matter.

6. Matter consisting of particles that differ from those found in atoms is generally referred to as exotic matter.

What is dark matter? Dark matter is a kind of matter that scientists assume to exist since it does not interact with light and cannot be seen through telescopes. Dark matter is believed to account for approximately 27% of the matter in the universe. Dark matter interacts gravitationally with visible matter and radiation, but it doesn't interact with electromagnetism, making it completely invisible to telescopes that observe electromagnetic radiation, such as radio waves, infrared light, visible light, ultraviolet light, X-rays, and gamma rays.

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The total number of valence electrons surrounding the central iodine atom in the icl2- ion is 8. Therefore, the correct answer is option C.

In the icl2- ion, the central iodine atom has 7 valence electrons. Since there are two chlorine atoms bonded to the central iodine, each chlorine atom brings one valence electron.

In addition, the ion carries a negative charge, which means that one extra electron is present. To determine the total number of valence electrons surrounding the central iodine atom, we add the valence electrons of the iodine atom (7) to the valence electrons of the two chlorine atoms (2 x 1 = 2) and the extra electron (-1). Thus, the total number of valence electrons surrounding the central iodine atom in the icl2- ion is 8. Therefore, the correct answer is option C.

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Answer:

:)

Explanation:

Gay-Lussac's Law states that the pressure of a given mass of gas varies directly with the absolute temperature of the gas, when the volume is kept constant.

Answer:

nah

Explanation:

Answer:

Solid: Definite shape and volume, particles vibrate in place, non-compressible

Liquid: Non-compressible, definite volume, no definite shape, particles slide past each other

Gas: Compressible, no definite shape or volume, particles slide past each other

Explanation:

Hope this helps!

Answer:

The electron configuration of nitrogen (N) is 1s²2s²2p³ . The electron configuration of an atom describes the distribution of electrons among different energy levels and orbitals. The first number in the electron configuration represents the principal energy level, while the letter represents the sublevel (s, p, d, or f). The superscript number represents the number of electrons in that sublevel .

The electron configuration of nitrogen (N) is 1s²2s²2p³. The correct option is 1.

An atom's electron configuration specifies how its electrons are dispersed throughout the various energy levels and orbitals.

The electron configuration of nitrogen (N), which has an atomic number of 7, is 1s²2s²2p³.

Nitrogen has a total of 7 electrons in this arrangement. The first energy level (1s) is completely occupied by two electrons, and the second energy level (2s) is also completely occupied by two electrons.

The remaining three electrons are in the 2p orbital. The 2p orbital is broken down into three suborbitals: 2px, 2py, and 2pz. Each suborbital may carry a maximum of two electrons, accounting for the three electrons in nitrogen's 2p³ structure.

Thus, the correct option is 1.

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Your question seems incomplete, the probable complete question is:

The electron configuration of nitrogen (N) is

Answer:

Number of protons is 9

Number of electrons is 9

Number of neutrons is 10

Explanation:

Atomic number refers to the number of protons or electrons in an atom, so the electrons and protons are 9.

Atomic mass is the sum of the number of protons and neutrons.

Therefore, there are 10 neutrons in the atom's nucleus

Answer:

4.73L

Explanation:

first convert the temp to kelvin by adding 237

then by applying combined gas law

will get the new volume

The specific heat of the substance is 0.761 J/g°C. To find the specific heat of the substance, we need to use the formula, q = m x c x ΔT, where q is the amount of energy transferred (in Joules), m is the mass of the substance (in grams), c is the specific heat of the substance (in J/g°C), and ΔT is the change in temperature (in °C).

We are given q = 2,022 J, m = 95.0 g, ΔT = 85.4°C - 63.3°C = 22.1°C. We can substitute these values into the formula and solve for c, 2,022 J = 95.0 g x c x 22.1°C, c = 2,022 J / (95.0 g x 22.1°C) = 0.761 J/g°C, Therefore, the specific heat of the substance is 0.761 J/g°C.

The specific heat, the quantity of heat required to raise the temperature of one gram of a substance by one Celsius degree. The units of specific heat are usually calories or joules per gram per Celsius degree. For example, the specific heat of water is 1 calorie or 4.186 joules per gram per Celsius degree.

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Roaches, shes a mammoth ofc, dice (k) in your face, stupid flipping dinosaur, umm anyways chile so, but why yall gosta lieeeeeee

Answer:

Explanation:

A 12.48 g sample of an unknown metal, heated to 99.0 °C was then plunged into 50.0 mL of 25.0 °C water. The temperature of the water rose to 28.1 Go to calculating final temperature when mixing two samples of water ... Problem #1: A 610. g piece of copper tubing is heated to 95.3 °C and placed in an ... The two rings are heated to 65.4 °C and dropped into 12.4 mL of water at 22.3 °C. ... Problem #4: A 5.00 g sample of aluminum (specific heat capacity = 0.89 J g¯1

Answer:

beryllium phosphate

Explanation:

The name of the ionic compound Be3(PO4)2 B e 3 ( P O 4 ) 2 is beryllium phosphate

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Due to the presence of two reactants and a single product, both chemical reactions X and Y are possible.

A synthesis reaction results in the formation of a single product that is more complicated than the initial reactants when two or more reactants are present.

When two or more reactants unite to create a single product, the reaction is called a synthesis. The general equation A + B = AB is used to describe this kind of reaction.

According to the definition of synthesis reactions, two reactants unite to create a chemical. In a synthesis reaction, two or more substances mix chemically to generate a single compound or a product.

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Answer: A

Explanation: It said on Course Hero

The freezing point of the solution is -11.8 °C.

The boiling point of the solution is 103.31 °C.

To determine the freezing point of the solution, we can use the equation:

ΔTf = Kf * m

where:

ΔTf is the freezing point depression,

Kf is the cryoscopic constant (for water, Kf = 1.86 °C/m),

m is the molality of the solution (moles of solute per kilogram of solvent).

First, let's calculate the molality (m) of the solution:

Molar mass of ethylene glycol (C2H6O2):

C = 12.01 g/mol

H = 1.01 g/mol (x 6) = 6.06 g/mol

O = 16.00 g/mol (x 2) = 32.00 g/mol

Total molar mass = 12.01 g/mol + 6.06 g/mol + 32.00 g/mol = 50.07 g/mol

Number of moles of ethylene glycol (C2H6O2) = mass / molar mass

Number of moles = 30.8 g / 50.07 g/mol = 0.615 mol

Mass of water = volume x density = 96.6 mL x 1.00 g/mL = 96.6 g

Now, let's calculate the molality:

Molality (m) = moles of solute / mass of solvent (in kg)

Molality = 0.615 mol / 0.0966 kg = 6.36 mol/kg

Now we can calculate the freezing point depression (ΔTf):

ΔTf = Kf * m

ΔTf = 1.86 °C/m * 6.36 mol/kg = 11.8 °C

To find the freezing point of the solution, subtract the freezing point depression from the freezing point of pure water (0 °C):

Freezing point = 0 °C - 11.8 °C = -11.8 °C

To determine the boiling point of the solution, we can use the equation:

ΔTb = Kb * m

where:

ΔTb is the boiling point elevation,

Kb is the ebullioscopic constant (for water, Kb = 0.52 °C/m),

m is the molality of the solution (same value as calculated before: 6.36 mol/kg).

ΔTb = 0.52 °C/m * 6.36 mol/kg = 3.31 °C

To find the boiling point of the solution, add the boiling point elevation to the boiling point of pure water (100 °C):

Boiling point = 100 °C + 3.31 °C = 103.31 °C

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Answer:2

Explanation:

The molar mass of P4 is 4 times the molar mass of a single phosphorus atom, which is approximately 30.974 g/mol. Therefore, the molar mass of P4 is: there are 8.41 x \(10^{23}\) phosphorus atoms present in 0.350 mol of P4.

4 x 30.974 g/mol = 123.896 g/mol

To calculate the number of moles of P4 in 0.350 mol, we can use the following equation:

moles = mass / molar mass

mass = moles x molar mass

mass of P4 = 0.350 mol x 123.896 g/mol = 43.3676 g

Since each P4 molecule contains 4 phosphorus atoms, we can calculate the total number of phosphorus atoms in 0.350 mol of P4 as follows:

number of P atoms = number of P4 molecules x 4

number of P atoms = 0.350 mol x 6.022 x 10^23 molecules/mol x 4 atoms/molecule

number of P atoms = 8.41 x \(10^{23}\) atoms

Therefore, there are 8.41 x \(10^{23}\) phosphorus atoms present in 0.350 mol of P4.

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Answer:

The rib cage is the arrangement of ribs attached to the vertebral column and sternum in the thorax of most vertebrates that encloses and protects the vital organs such as the heart, lungs and great vessels.

Hope that helps. x

Answer:

Carbon tetrachloride is non-polar and so the only kind of force that can exist is induced dipole.

Quantum mechanics, although mathematically complex is 4

What is quantum number ?

A total of four quantum numbers are used to fully describe the motion and trajectory of each electron in an atom. The combination of  quantum numbers of electrons is described by a wavefunction corresponding to the Schrödinger equation. Each electron has a unique set of quantum numbers. According to  Pauli exclusion principle, no two electrons share the same combination of he four quantum numbers. Quantum numbers are important because they can be used to determine the electron configuration of atoms and the putative positions of atomic electrons. Quantum numbers are also used to understand other properties of atoms such as: B. Ionization energy and atomic radius. Atoms have four quantum numbers.

Principal (n), orbital angular momentum  (l), magnetic  (ml), electron spin  (ms).

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The mass of Al required to completely react with 22.6 g of MnO2 is approximately 13.9 g.

To determine the mass of Al required to completely react with 22.6 g of MnO2, we need to consider the balanced chemical equation for the reaction between Al and MnO2:

2 Al + MnO2 → Al2O3 + Mn

From the balanced equation, we can see that the stoichiometric ratio between Al and MnO2 is 2:1. This means that 2 moles of Al react with 1 mole of MnO2.

First, let's calculate the molar mass of MnO2:

Molar mass of MnO2 = 55.85 g/mol (molar mass of Mn) + 2 * 16.00 g/mol (molar mass of O) = 87.85 g/mol

Next, we calculate the number of moles of MnO2:

Number of moles of MnO2 = mass / molar mass = 22.6 g / 87.85 g/mol = 0.257 moles

Since the stoichiometric ratio is 2:1, we need twice the number of moles of Al:

Number of moles of Al = 2 * 0.257 moles = 0.514 moles

Finally, we calculate the mass of Al required:

Mass of Al = number of moles of Al * molar mass of Al = 0.514 moles * 26.98 g/mol = 13.9 g

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Answer:

C

Explanation:

Because how would you know what the reaction rate is and how it is affected by the concentrations

The information that the rate constant give from the rate law is it tells how much the reaction rate is affected by activation energy.

Hence, Option (D) is correct answer.

The rate law is also known as rate equation which is defined as the law which is used to predict the relationship between the rate of the reaction and the concentration of the reactants participating in it.

It is expressed as

Rate = k [A]ˣ [B]ⁿ

where,

k is rate constant

A is concentration of species A

x is order of reaction w.r.t A

B is concentration of species B

n is order of reaction w.r.t B

Thus from the above conclusion we can say that The information that the rate constant give from the rate law is it tells how much the reaction rate is affected by activation energy.

Hence, Option (D) is correct answer.

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The amount of copper deposited is 0.1778 grams.

The electrolysis reaction for CuSO₄ solution

Copper deposits will occur at the cathode. According to Faraday's law the number of moles of an electron

ne = It ÷ 96,500

ne = (0.450 × 1,200) ÷ 96,500

ne = 540 ÷ 96,500

ne = 5.6 × 10⁻³ mol

The ratio of the coefficients of each element is equal to the ratio of the number of moles.

ne : n Cu = 2 : 1

n Cu = ne ÷ 2

n Cu = (5.6 × 10⁻³) ÷ 2

n Cu = 2.8 × 10⁻³ mol

Calculate the amount of copper

The molar mass for copper = 63.5

m = n × molar mass

m = 2.8 × 10⁻³ × 63.5

m = 0.1778 grams

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Answer:

Ionization smoke detectors use americium as a source of alpha particles. Alpha particles from the americium source ionize air molecules. This makes some particles positively charged and some negatively charged. ... Because of this shielding, the smoke detector poses no radiation health risk when they are properly handled.

Explanation:

Hope this helped! :D

The correct order of particles in increasing mass is option A) Electron, neutron, proton

The electron, being the lightest particle, has the smallest mass among the three. It weighs approximately 9.1 x 10^-31 kilograms. Neutrons, slightly heavier, have a mass of around 1.67 x 10^-27 kilograms. Protons, being the heaviest, have a mass of about 1.67 x 10^-27 kilograms.

In conclusion, the order of particles in increasing mass is electron, neutron, and proton. The electron, with the smallest mass, is followed by the neutron, and the proton is the heaviest among the three particles.

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The complete question is:

Which list of particles is in order of increasing mass:

A) Electron, neutron, proton

B) Neutron, electron, proton

C) Proton, electron, neutron

A combustion reaction will always be associated with a change in entropy that will be is option a. positive.

A combustion reaction involves the burning of a fuel in the presence of oxygen, producing carbon dioxide and water as products. This type of reaction typically releases a large amount of heat and is highly exothermic.

According to the second law of thermodynamics, all spontaneous processes in a closed system lead to an increase in the entropy of the system. The combustion reaction is a spontaneous process that results in the formation of more product molecules than reactant molecules.

Therefore, the number of possible arrangements of molecules in the product state is greater than that in the reactant state, which leads to an increase in entropy.

Hence, a combustion reaction is always associated with a positive change in entropy. The correct answer is option a.

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Answer: 40.3

Explanation:

In the reaction, we see that for every 3 moles of oxygen gas consumed, 2 moles of rust are formed.

So this means that if 60.5 moles of oxygen gas are consumed, then (60.5/3)(2)=40.3 moles of rust can be formed.

Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

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

From the question

mass = 13 g

density = 19.3 g/cm³

We have

\(volume = \frac{13}{19.3} \\ = 0.673575...\)

We have the final answer as

Hope this helps you