Fe has __ that is(are) unpaired in its d orbitals

preferAnswer:

The octet rule refers to the tendency of atoms to prefer to have eight electrons in the valence shell. When atoms have fewer than eight electrons, they tend to react and form more stable compounds. Atoms will react to get in the most stable state possible

Explanation:

Hopefully this is what your looking for

Expressing this answer in scientific notation, the amount of N2 produced according to the engineer's design would be approximately 1.467 x 10^1 mol.

To determine the amount of N2 produced in the reaction between dinitrogen tetroxide (N2O4) and excess hydrazine (N2H4), we need to consider the stoichiometry of the reaction.

The balanced equation for the reaction is:

N2H4 + N2O4 → N2 + 2H2O

According to the stoichiometry of the reaction, for every one mole of N2H4, one mole of N2 is produced. The molar mass of N2H4 is approximately 32.05 g/mol.

Given that the rocket is designed to hold 1.35 kg (1350 g) of N2O4, we can calculate the moles of N2H4 required:

Moles of N2H4 = Mass of N2O4 / Molar mass of N2O4

Moles of N2H4 = 1350 g / 92.01 g/mol ≈ 14.67 mol

Since the stoichiometry is 1:1, the amount of N2 produced will be equal to the moles of N2H4:

Moles of N2 produced = Moles of N2H4 ≈ 14.67 mol

Expressing this answer in scientific notation, the amount of N2 produced according to the engineer's design would be approximately 1.467 x 10^1 mol.

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Answer:

Hydrogen may be used in fuel cells for local electricity generation or potentially as a transportation fuel. Hydrogen is produced as a by-product of industrial chlorine production by electrolysis.

Answer:

-175.15

Explanation:

1.0 °C = 274.15 K

2.0 °C = 275.15 K

3.0 °C = 276.15 K

4.0 °C = 277.15 K

5.0 °C = 278.15 K

6.0 °C = 279.15 K

7.0 °C = 280.15 K

8.0 °C = 281.15 K

9.0 °C = 282.15 K

Yes, igneous rock become sedimentary rock through a process called sedimentation.

In sedimentation, An igneous rock is broken down or crushed into little piece of rock called sediment, the sediment is then packed together as a result of othe rocks or strong forces, that form together to make a Sedimentary rock.

Conclusively, The process of erosion, heat and depositing rock grains which can also be known as sedimentation can alter or change igneous rock into sedimentary rock.

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Answer:

63.5474U.M.A. es la masa atómica promedio del cobre

Explanation:

La masa atómica promedio de un átomo es definida como la suma de las masas de los isótopos multiplicada por su abundancia. Para el caso del cobre que tiene dos isótopos:

Cu = Masa 65Cu*Abundancia + Masa 63Cu*Abundancia

Reemplazando con los valores dados en el problema:

Cu = 62.9298U.M.A.*0.6909 + 64.9278U.M.A.*0.3091

Cu = 63.5474U.M.A. es la masa atómica promedio del cobre

The difference in pH between blood and saliva (1 unit) indicates that the concentration of H+ ions in saliva is 10 times higher than in blood.  option B is correct.

A pH of 7 is considered neutral, meaning the concentration of H+ and hydroxide ions (OH-) are equal. A pH below 7 indicates an acidic solution, with a higher concentration of H+ ions, while a pH above 7 indicates a basic solution, with a higher concentration of OH- ions. Therefore, the pH of saliva indicates that it is slightly acidic compared to blood, which is slightly basic. The difference in pH between blood and saliva can be used to calculate the difference in concentration of H+ ions. The pH scale is logarithmic, which means that for every one unit change in pH, the concentration of H+ ions changes by a factor of 10. This means that saliva is more acidic than blood and contains a higher concentration of H+ ions.

option B

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The first step to answer this question is to assume that the given percents are masses.

Then, convert these masses to moles using the corresponding molar mass:

Divide each result by the least result (1.26mol):

Since not all of these are whole numbers, we have to multiply them times 2:

These numbers are the subscripts of each element in the empirical formula.

It means that the empirical formula of this compound is:

To determine the species left in the beaker after the reaction goes to completion, we need to identify the limiting reactant. We can do this by comparing the moles of each reactant and their stoichiometric coefficients in the balanced chemical equation.

The balanced chemical equation for the reaction between C₅H₅NH⁺ and OH⁻ is:

C₅H₅NH⁺ + OH⁻ → C₅H₅N + H₂O

From the equation, we can see that the stoichiometric ratio between C₅H₅NH⁺ and OH⁻ is 1:1.

Given:

Moles of C₅H₅NH⁺ = 0.00440 moles

Moles of OH⁻ = 0.00289 moles

Since the stoichiometric ratio is 1:1, the reactant with the lower number of moles will be completely consumed, and the excess reactant will be left in the beaker.

Comparing the moles, we see that OH⁻ is the limiting reactant because it has fewer moles than C₅H₅NH⁺.

Therefore, after the reaction goes to completion, the species left in the beaker would be the excess C₅H₅NH⁺.

Note: The term "goes to completion" implies that the reaction proceeds until one of the reactants is completely consumed. In reality, the reaction may not go to completion due to side reactions, equilibrium, or other factors.

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Considering only the energy of the nuclei, the energy released by the electron-capture decay of 5727Co is approximately 0.836 MeV.

To calculate the energy released by the electron-capture decay of 5727Co, we'll use the given masses and the mass-energy equivalence formula.

First, we find the mass difference between the parent nucleus (5727Co) and the daughter nucleus (5726Fe):
Δm = m(5727Co) - m(5726Fe) = 56.936296u - 56.935399u = 0.000897u

Now, we'll convert this mass difference to energy using the mass-energy equivalence formula E=mc² and the conversion factors for atomic mass units (u) and electron volts (eV):

E = Δm * c²
E = 0.000897u * (931.5 MeV/u) = 0.8356415 MeV

So, the energy released by the electron-capture decay of 5727Co is approximately 0.836 MeV.

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Answer: 3

Explanation:

Neon

The noble gas that is used by researchers to cool down samples for analysis is neon.

What is a noble gas?

A noble gas is a group of elements that make up group 18 of the periodic table. Noble gases are nonreactive, nonmetallic chemical elements that have full outer electron shells (thus making them highly stable) and low reactivity. The six noble gases are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn).

What are the uses of neon?

Neon has a number of applications in a variety of fields, some of which are listed below:

Electronics: neon is used in high-voltage indicators, lightning arresters, and electronic equipment as a low-pressure gas.

Neon lamps are used in night glow signs and decorative lighting for homes and businesses. Lasers: Neon gas is used in gas lasers, which are frequently used in medical equipment and research laboratories.

Radiometric dating: Radon-222, a decay product of radium-226, can be used to date rocks and fossils.

Neon is used by researchers to cool down samples for analysis.

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Answer: It wasn't that long ago that frames were made out of cast iron or even wood. Today bicycles are made out of exotic materials such as titanium, aluminum, and carbon fiber. Bicycle frames in the 1990s are lighter and stronger than ever before. A racing bicycle frame with parts of the frameset indicated.

Explanation:

Bicycles are now made of exotic materials like titanium, aluminum, and carbon fiber. Bicycle frames are lighter and stronger than ever before in the 1990s.

Steel is the most common material used in bike frames. Carbon or high-tensile steel is a good, strong, and long-lasting steel, but it isn't as light as its more advanced sibling, chromoly steel.

So we've established that the bike has mass and occupies space, and thus the bicycle is matter.

Some bicycles are constructed from titanium or scandium-aluminum alloyed metals. Some bicycles have a steel alloyed frame.

Thus, Recycling yields aluminum, iron (and steel), magnesium, titanium, zinc, and silica (from glass). Bicycles are now made of exotic materials like titanium, aluminum, and carbon fiber.

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Molecules have the most variation in their properties from the elements that make them because of the nature of chemical bonding.

Molecules are the smallest particles in a chemical element or compound that have the chemical properties of that element or compound. Whereas, an element is a substance made up of only one type of atom. The number of protons in the nucleus of an atom distinguishes one element from another. The properties of molecules and elements differ.

As molecules are made up of two or more atoms that are chemically bonded, they possess properties different from those of the constituent atoms, including unique chemical and physical properties such as boiling and melting points, solubility, conductivity, and reactivity.

In simple terms, the properties of molecules vary from those of the atoms from which they are formed due to the formation of new bonds between atoms. Chemical bonding is the process of holding two or more atoms together by electrostatic forces to produce molecules, crystals, or other stable aggregations of matter. The four types of chemical bonds are Ionic, covalent, metallic, and hydrogen.

As a result, each molecule has its unique set of properties and differs from the properties of the elements they are made of.

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Answer:

A

Explanation:

the same as an electron

6. An organic compound is analyzed and found to be carbon (51.90%), hydrogen (9.80%), and chlorine (38.30%). To get the empirical formula of a compound, follow these steps:

Assume the mass to be 100 g, so we will have 51.90 g of carbon, 9.80 g of hydrogen, and 38.30 g of chlorine.Calculate the moles of each element by dividing their mass by their atomic weight.Divide all of the moles by the smallest number of moles to find the ratio of the elements.Use the ratio to determine the empirical formula.The atomic weight of carbon, hydrogen, and chlorine are 12, 1, and 35.5 respectively.Carbon:

51.90 / 12 = 4.325 moles

Hydrogen: 9.80 / 1 = 9.80 moles

Chlorine: 38.30 / 35.5 = 1.080 moles

Carbon: 4.325 / 1.080 = 4

Hydrogen: 9.80 / 1.080 = 9

Chlorine: 1.080 / 1.080 = 1

The empirical formula of the compound is therefore C4H9Cl.

7. A sample of oxygen gas  Oxygen has the chemical symbol O. It is a chemical element with the atomic number 8 and atomic weight of 15.9994. O2 is the most prevalent molecular form of oxygen. It is utilized in many applications, including welding and metal cutting as well as medical therapies.

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The molarity of the acid solution is 0.075 mol/L.

Molarity = (moles of solute) / (liters of solution)

Volume of NaOH solution = 42.36 mL = 0.04236 L

Liters of H₂SO₄  solution = 35.78 mL = 0.03578 L

Concentration of NaOH solution = 0.1270 M

To find out the moles of NaOH used in the reaction, we can use the formula:

Moles of solute = Concentration x Volume of solution in liters

Moles of NaOH = 0.1270 M x 0.04236 L = 0.00537172 mol

Since the balanced chemical equation for the reaction between NaOH and H2SO4 is:

2 NaOH + H₂SO₄ → Na₂SO₄ + 2 H₂O

Moles of H₂SO₄ = 0.5 x Moles of NaOH = 0.5 x 0.00537172 mol = 0.00268586 mol

Now, we can calculate the molarity of H₂SO4using the above formula:

Molarity of H₂SO₄ = (moles of H₂SO₄) / (liters of H₂SO₄ solution)

Molarity of H₂SO₄ = 0.00268586 mol / 0.03578 L = 0.075 mol/L

Therefore, the molarity of the acid solution is 0.075 mol/L.

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Answer:

m = 0.025 kg

Explanation:

Condensation is the change of state of a substance from vapor to liquid. This involves the specific latent heat of vaporisation of water = 2.25 × 10^6 J/kg

Amount of heat (Q) = mass (m) × Specific latent heat of vaporisation (Lv)

m = Q ÷ Lv

m = (57500 J) ÷ (2.25 × 10^6 J/kg)

m = 0.025 kg

Answer:

helps to trap heat in our atmosphere

Answer: Observing

Explanation: Information gathered in an experiment is called data, and its represents observations derived from the methods of the experiment on its sample elements.  Hope this helped! :)

The Information gathered from observations and experimentation is called empirical evidence. Empirical evidence is a significant part of scientific research and helps to further results and discussions.

Scientific research is a well designed and organised steps to conducts a scientific experiment for solving a problem under study. The research  methodologies include logical, economic and creative ways to reveal the solution for a problem.

Information obtained through testing or observation is known as empirical evidence. These data are logged and examined by scientists. The procedure, which is a key component of the scientific method, results in the confirmation or rejection of a hypothesis and, as a result, improves our knowledge of the universe.

A hypothesis can be tested and accurately evaluated using different types of data collection, such as experiments that aim to produce a quantifiable or observable reaction, trials that replicate experiments to test their effectiveness  or other methods of data collection.

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Answer:

No

Explanation:

I think because liquid nitrogen is only made by 1 substance which is nitrogen that exist as a gas.. It only become liquid when the temperature is very cold not because of other combination of elements.. Hope it helps

Answer:

The answer should be I and III

Answer:

| and |||

Explanation:

Pascal's principle explains the hydraulic jack pressure propagation in enclosed static fluids, option D.

A strain change in one region of a liquid very still in a shut compartment is moved without misfortune to all region of the liquid as well as the holder walls, as per Pascal's guideline, some of the time known as Pascal's regulation. The French physicist Blaise Pascal at first expressed the thought.

Pressure is created when the force applied is multiplied by the surface area. Pascal's standard expresses that a strain ascend on one cylinder in a water powered framework causes an identical press one more cylinder in the framework. Assuming the second cylinder's region is multiple times higher than the first's, regardless of whether the strain is something very similar, the power following up on the subsequent cylinder will be multiple times more.

A good illustration of this effect is the hydraulic press, which is based on Pascal's idea and is used in systems like hydraulic brakes. Additionally, Pascal observed that a fluid's resting point has the same pressure in all directions; As a result, all planes passing through a given location would experience the same amount of pressure. Pascal's regulation or the Pascal's standard are different names for this reality.

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The number of moles of calcium chloride ( CaCl₂) are contained in the given sample is 0.045 moles.

Given that :

The mass of the calcium chloride, CaCl₂ = 5 g

The molar mass of the calcium chloride, CaCl₂ = 110.98 g /mol

The number of moles can be calculated by the formula given below :

The number of moles = mass / molar mass

where,

Mass = 5 g

Molar mass = 119.98 g/mol

The number of moles = 5 g / 110.98 g /mol

The number of moles = 0.045 moles.

The moles of the calcium chloride ,  CaCl₂ is 0.045 mol.

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Answer:

The cell membrane, also called the plasma membrane, is found in all cells and separates the interior of the cell from the outside environment. The cell membrane consists of a lipid bilayer that is semipermeable. The cell membrane regulates the transport of materials entering and exiting the cell.

answer

the answer is B i think

Explanation:

Answer:

Explanation:    29.99g/mol

Answer:

23.0 g/mol

Explanation:

To find the molar mass of sodium or Na, look at the periodic table.

Then try to find where sodium is.

After that, then try to check the atomic mass of sodium.

The atomic mass of sodium is 23.0

So the molar mass is 23.0 g/mol

That's it. Molar mass means the same thing as atomic mass.

Hope it helped!

The chemical formula of mentioned substances is as follows 1) SO₃ 2) K\(^+\) and NO₃\(^-\) 3) ΔH 4) Cu 5) Hg (l) 6)ZnCl₂.

Chemical  formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols  of elements. It also makes use of brackets and subscripts.

Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form  is called empirical formula.

It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.

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Answer:

2.43 grams are needed

Explanation:

I did the test

Hope this helps :)