53. The bond enthalpy of O2 is 498.7 kJ/mol. Calculate the maximum wavelength (nm) of a photon that can cause the dissociation of an O2 molecule.

Answer:

C. 2O₃ ⇌ 3O₂

Explanation:

Kp is the equilibrium constant calculated from the partial pressures of a gas-phase reaction equation.

For a general gas-phase reaction aA + bB ⇌ nC + xD

the expression for the Kp = (pC)ⁿ(pD)ˣ / (pA)ᵃ(pB)ᵇ

where pA = partial pressure of A; pB = partial pressure of B; pC = partial pressure of C; pD = partial pressure of D

From the given reaction in equilibrium;  N₂ + 3H₂  ⇌ 2NH₃

Kp = (pNH₃)² / (pN₂)¹ * (pH₂)³ = 4/7

(pNH₃)² / (pN₂)¹ * (pH₂)³ = (2)²/ (1)¹ * (3)³

Therefore, number of mole of reactants and products is equivalent to partial pressure.

A. 2SO₂ ⇌ O₂ + 2SO₃

pSO₂ = 2, pO₂ = 1, pSO₃ = 2,

Kp =  2²/ (2² * 1²) = 4/4 = 1

B. N₂O₄ ⇌ 2NO₂

pN₂O₄ = 1, pNO₂ = 2

Kp = 2²/1² = 4

C. 2O₃ ⇌ 3O₂

pO₃ = 2, pO₂ = 3

Kp = 3³/2² = 27/4

D. PCl₅ ⇌ PCl₃ + Cl₂

pPCl₅ = 1, pPCl₃ = 1, pCl₂ = 1

Kp = (1¹ * 1¹) / 1¹ = 1

The correct statement that describes the relationship between thermal energy and particle movement is "As thermal energy increases, there is more particle movement".

WHAT IS THERMAL ENERGY?

Hence, as thermal energy of substance increases, there is more particle movement of that substance.

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Answer:

Magnesium chloride

Destabilization that occurs in a molecule when two non bonded atoms are too close together is called Van der Waals repulsion.

When two non bonded atoms come close together then in such situation there are two types of forces that come into play.

First one is Van der Waal attractive forces and the second one is van der Waal repulsion forces.

Van der Waal attractive forces are the forces of attraction between the electronic cloud of one atom/molecule with the nucleus of the other atom/molecule and van der Waal repulsive forces are the force of repulsion between the electronic cloud of the both the atoms/molecules and the repulsion between the nucleus of both the atoms/molecules.

Attractive forces causes stabilization whereas repulsive forces causes destabilization.

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The 149.2 grams of potassium chloride would be produced if 78 grams of potassium and 71 grams of chlorine completely reacted.

The balanced chemical equation for the reaction between potassium metal (K) and chlorine gas (Cl₂) to form solid potassium chloride (KCl) is:

2K(s) + Cl₂(g) → 2KCl(s)

This equation indicates that two atoms of potassium react with one molecule of chlorine gas to yield two molecules of potassium chloride.

The type of reaction is a combination reaction, also known as a synthesis reaction. In this type of reaction, two or more substances combine to form a single product.

To determine the mass of potassium chloride produced, we need to calculate the limiting reactant. The molar mass of potassium is approximately 39.1 g/mol, and the molar mass of chlorine is approximately 35.5 g/mol.

First, we convert the given masses of potassium (78 g) and chlorine (71 g) into moles by dividing them by their respective molar masses:

Moles of potassium = 78 g / 39.1 g/mol = 2 mol

Moles of chlorine = 71 g / 35.5 g/mol ≈ 2 mol

Since the reactants have a 1:1 stoichiometric ratio, it can be seen that both potassium and chlorine are present in the same amount. Therefore, the limiting reactant is either potassium or chlorine.

Assuming potassium is the limiting reactant, we can calculate the mass of potassium chloride produced. Since 2 moles of potassium react to form 2 moles of potassium chloride, we can use the molar mass of potassium chloride (74.6 g/mol) to calculate the mass:

Mass of potassium chloride = 2 mol × 74.6 g/mol = 149.2 g

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Hence, the correct option is D) C5H7O3.

Nicotine is an addictive substance that is found in cigarettes.

The chemical formula for nicotine is C10H14O6.

To determine the empirical formula, one must find the smallest whole-number ratio of the atoms present. For that, we need to divide the subscripts by their greatest common divisor which in this case is 2.

According to the question, the chemical formula of nicotine is C10​H14​O6​.We need to determine its empirical formula.

To do this, we divide each subscript by their greatest common divisor which is 2 in this case.C10H14O6→C5H7O3Therefore, the empirical formula of Nicotine is C5H7O3.

Hence, the correct option is D) C5H7O3.

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Answer:

A solid will retain its shape; the particles are not free to move around. Liquid matter is made of more loosely packed particles. It would take the shape of its container. Particles can move about within a liquid,  they are packed densely enough that volume is maintained.

Explanation:

Answer:       electron on the shell  of the atom

Explanation:  that what I trying to remember

To determine the phases present, a fraction of each phase, and the composition of each phase in a carbon-fe alloy containing 1.5 wt% C cooled down to 800°C, you would need to refer to the phase diagram for carbon-iron (Fe-C) alloy, also known as the iron-carbon phase diagram.

1. Consult the phase diagram: Look for the region that corresponds to the composition of the alloy, which is 1.5 wt% C.

Find the temperature range of 800°C.

2. Determine the phases present: From the phase diagram, identify the phases present at 800°C for an alloy with 1.5 wt% C.

3. Determine the fraction of each phase present: The phase diagram may provide information about the fraction of each phase present at 800°C for the given composition.

4. Determine the composition of each phase: The phase diagram should also indicate the composition of each phase present at 800°C.

Please refer to the specific phase diagram for the carbon-fe alloy you are working with to find the exact information on phases, fractions, and compositions at 800°C for an alloy with 1.5 wt% C.

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Answer:

Products have less potential energy than reactants.

Explanation:

Let's remember the concept of an exothermic reaction: a chemical reaction or physical change is exothermic if heat is released by the system into the surroundings. Because the surroundings are gaining heat from the system, the temperature of the surroundings increases.

Now, let's see how looks a potential energy diagram for an exothermic reaction:

This represents that the products have less potential energy than reactants.

Answer:

true

Explanation:

all cells will have plasma membranes

Answer:

A lack of rain or the location is experiencing a dry season

Explanation:

Answer:

D - Chemical energy transforms into thermal energy and radiant energy

Explanation:

Correct on edge 2020

Answer:

(D)

Explanation:

Chemical energy transforms into thermal energy and radiant energy.

Answer:

D.) Carbon Dioxide

Explanation:

Pure Substance is defined as an element or compound that cannot be separated by physical means. In this case, Carbon Dioxide is a molecule that cannot be separated without breaking a chemical bond.

Answer:

NaCl consists of one atom each of sodium and chlorine. Hence, each molecule of NaCl has 2 atoms total.

Explanation:

Answer: There is only one atom of sodium in NACL

Explanation: But in total there two atoms because 1 sodium and 1 chlorine added all together

HOPE THIS HELPS!!!!

Answer:

15

Explanation:

Number of atoms of Mg = 3

Number of atoms of O = 3 × 2 = 6

Number of atoms of H = 3 × 2 = 6

So, total atoms = 3 + 6 + 6 = 15

Answer: The mass density is 1166.36 \(kg/m^{3}\).

Explanation:

Given: Weight of sample in air \((F_{air})\) = 500 N

Weight of sample in alcohol \((F_{alc})\) = 200 N

Specific gravity = 0.7 = \(0.7 \times 1000 = 700 kg/m^{3}\)

Formula used to calculate Buoyant force is as follows.

\(F_{B} = F_{air} - F_{alc}\\= 500 - 200 \\= 300 N\)

Hence, volume of the material is calculated as follows.

\(V = \frac{F_{B}}{\rho \times g}\)

where,

\(F_{B}\) = Buoyant force

\(\rho\) = specific gravity

g = acceleration due to gravity = 9.81

Substitute the values into above formula.

\(V = \frac{F_{B}}{\rho \times g}\\= \frac{300}{700 \times 9.81}\\= \frac{300}{6867}\\= 0.0437 m^{3}\)

Now, mass of the material is calculated as follows.

\(mass = \frac{F_{air}}{g}\\= \frac{500 N}{9.81}\\= 50.97 kg\)

Therefore, density of the material or mass density is as follows.

\(Density = \frac{mass}{volume}\\= \frac{50.97 kg}{0.0437 m^{3}}\\= 1166.36 kg/m^{3}\)

Thus, we can conclude that the mass density is 1166.36 \(kg/m^{3}\).

Answer:

Xe that is xenon

Explanation:

Xe that is xenon

The final temperature of the cup may be less than accurate thereby affecting the entire results of the experiment carried out using the cup.

A styrofoam cup is an insulated material. A styrofoam cup prevents heat gain or looses from the cup. Heat is gained by the water inside the styrofoam cup. The cup prevents exchange of energy with the environment.

When water is lost from the styrofoam cup, the final temperature of the cup may be less than accurate thereby affecting the entire results of the experiment carried out using the cup.

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The purpose of 2-mercaptoethanol in the buffer RLT (lysis buffer) is to reduce disulfide bonds between proteins,

thereby denaturing them and allowing their release from the cell. Disulfide bonds are important for the structure and stability of many proteins,

and the reduction of these bonds can disrupt their normal function. 2-mercaptoethanol is a reducing agent that breaks the disulfide bonds,

allowing the proteins to be extracted from the cell lysate. This is particularly important in experiments such

as western blotting and protein purification, where the denaturation of proteins is desired to analyze or separate them.

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i think A but if I'm wrong sorry

then if increasing then becoming spread out so letter A

The molar mass of NaCl is approximately 58.44 g/mol. Therefore, there are 244.968 grams in 4.20 mol of NaCl.


Molar mass is the mass of one mole of a substance and is calculated by adding the atomic mass of all the atoms in a molecule. The molar mass of sodium chloride (NaCl) is approximately 58.44 g/mol.  

To calculate the number of grams in 4.20 mol of NaCl, we can use the following formula:  

mass = number of moles × molar mass  

Substituting the given values into the formula, we get:  

mass = 4.20 mol × 58.44 g/mol  

mass = 244.968 g  

Therefore, there are 244.968 grams in 4.20 mol of NaCl.

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Answer:

Yes

Explanation:

Yes, but almost insignificantly. The regular boiling point of water is 100 degrees celcius, adding a small handfull of salt will increase the boiling point to roughly 100.04 degrees celcius. Therefore, it is almost insignificant but still does affect it. This is mainly because salt changes the way the molecules react thus making it harder for them to change state from liquid to gas. This ultimately causes the water to get hotter before boiling actually occurs.

The reasonable ground - state electron configuration is 1s² 2s²2p⁶

1) Electron configuration is defined as the arrangement of electron in the atomic orbtials.

2)The ground state electron configuration is lowest energy level and have most stable arrangement.

3) An excited state configuration is a higher energy level.

4) According to Aufbau principle ., electrons will occupy the orbitals of lower energies first then occupying higher energy orbitals.

5) Energy of orbitals is calculated by the sum of principle quantum number and azimuthal quantum numbers.

6) The rule of electron filling in the orbital is from lower energy level to higher energy level.

7) According to this rule electrons are filled in the order of 1s 2s 2p 3s 3p 4s 3d 4p 5s ........and so on.

8) According to pauli principle , maximum two electrons, having opposite spin can fit in orbital.

9) According to Hund's rule , orbital in given sub-shell is singly occupied by electrons before filling second electron in an orbital.

10) The ground state configuration is the arrangement of electron around the nucleus of an atom with lower energy levels.

Hence,The reasonable ground-state electron configuration is 1s² 2s² 2p⁶

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In the context of atomic orbital (AO) wavefunctions, the terms "radial node" and "nodal plane" refer to different aspects of the wavefunction's behavior.

A radial node is a region in the AO wavefunction where the probability of finding an electron is zero along the radial direction. In other words, it represents a spherical shell where the electron is unlikely to be found. The number of radial nodes is determined by the principal quantum number (n) of the orbital. For example, the 2s orbital has one radial node, while the 2p orbital has no radial nodes.

On the other hand, a nodal plane is a flat plane within the AO wavefunction where the probability of finding an electron is zero along a particular direction. It represents a surface that divides the orbital into two regions of opposite phases. The number of nodal planes is determined by the angular quantum numbers (l and m) of the orbital. For example, the 2s orbital has no nodal planes, while the 2p orbital has one nodal plane (the xz or yz plane).

Radial nodes arise from the radial part of the wavefunction because they depend on the distance from the nucleus. The radial part determines the distribution of the electron density as a function of distance, and the nodes correspond to regions where the density drops to zero.

On the other hand, nodal planes arise from the angular part of the wavefunction because they depend on the orientation and shape of the orbital. The angular part describes the angular distribution of the electron density around the nucleus, and the nodal planes correspond to regions where the phase of the wavefunction changes sign.

In summary, radial nodes are related to the distance from the nucleus and arise from the radial part of the wavefunction, while nodal planes are related to the orientation and shape of the orbital and arise from the angular part of the wavefunction. The 2s orbital has one radial node and no nodal planes, while the 2p orbital has no radial nodes and one nodal plane.

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When the umbilical cord is tied after birth, the umbilical arteries close by filling in with connective tissue. The umbilical arteries carry deoxygenated blood from the fetus to the placenta, where the blood is oxygenated and returned to the fetus via the umbilical vein.

When the umbilical cord is cut, the flow of blood from the placenta to the fetus ceases, and the umbilical arteries and vein begin to constrict. This constriction is caused by the contraction of smooth muscles in the vessel walls and the closure of small valves within the vessels. As the umbilical arteries constrict, the flow of blood to the placenta decreases and the vessels begin to fill in with connective tissue. Over time, the connective tissue replaces the smooth muscle and valve tissue in the vessel walls, resulting in the complete closure of the umbilical arteries. This process is important to prevent bleeding and infection in the newborn.

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Answer:

i dk how ur school works, but you'll most likely have to take that science again to get the credits u need to graduate

Explanation:

Answer:

-layer of permeable rocks

-underground water storehouse

-layer of impermeable rocks

Explanation:

The statements that describe aquifer are:

A. a layer of permeable rocks.

C. underground water storehouse.

D. the layer of impermeable rocks.

Aquifers are bodies of permeable rock or sediment that have been flooded by groundwater.

As rainwater penetrates through the earth, groundwater enters an aquifer.

It has the ability to go through the aquifer and re-emerge via springs and wells.

There are three types of aquifers

Thus, the correct options are A. a layer of permeable rocks., C. underground water storehouse., D. the layer of impermeable rocks.

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The dot structure that can be shown to be incorrect is the dot structure that has been shown by option A

The Lewis structure is based on the concept that atoms tend to gain, lose, or share electrons in order to achieve a stable electron configuration similar to that of a noble gas. In the Lewis structure, the valence electrons of the atoms are represented as dots around the symbol of the atom.

We can see that in the dot structure that is in option A the both atoms are coming from the hydrogen atoms and shoud not be differently marked.

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the actual quantity of nitrogen, phosphorus, and potassium guaranteed to be applied to the maize field is 50 kg, 50 kg, and 25 kg, respectively.

For Nitrogen (N):

The percentage of nitrogen in the fertilizer is 20%. Therefore, the amount of nitrogen applied can be calculated as:

Nitrogen = (20/100) * 250 kg

Nitrogen = 0.2 * 250 kg

Nitrogen = 50 kg

For Phosphorus (P):

The percentage of phosphorus in the fertilizer is also 20%. Thus, the amount of phosphorus applied can be calculated as:

Phosphorus = (20/100) * 250 kg

Phosphorus = 0.2 * 250 kg

Phosphorus = 50 kg

For Potassium (K):

The percentage of potassium in the fertilizer is 10%. So, the amount of potassium applied can be determined as:

Potassium = (10/100) * 250 kg

Potassium = 0.1 * 250 kg

Potassium = 25 kg

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