Which one of the following statements about the Bohr model is incorrect?Orbits may have only specific energy values in an atom.The number of electrons in the innermost orbit of an atom in the ground state is always the same as the the period number for that atom.The third orbit from the nucleus can hold a maximum of eighteen electrons.Electrons can move between orbits by absorbing or emitting electromagnetic radiation.Electrons may orbit the nucleus only a specific distances.

Answer:

\(Purity=99\%\)

Explanation:

Hello,

In this case, the undergoing precipitation reaction is:

\(MgCl_2+2AgNO_3\rightarrow Mg(NO_3)_2+2AgCl\)

Thus, for the 0.2500 moles of silver nitrate, the following mass of magnesium chloride is consumed (consider their 2:1 molar ratio):

\(m_{MgCl_2}=0.2500molAgNO_3*\frac{1molMgCl_2}{2molAgNO_3} *\frac{95.2gMgCl_2}{1molMgCl_2} \\\\m_{MgCl_2}=11.90gMgCl_2\)

Therefore, the purity of the sample is:

\(Purity=\frac{11.90g}{12.00g}*100\%\\ \\Purity=99\%\)

Best regards.

Answer: 99. 17%

Explanation:

MgCl2(aq)+2AgNO3(aq)⟶2AgCl(s)+Mg(NO3)2(aq)

(0.2500 mol AgNO3 × 1 mol (MgCl2) /2 mol (AgNO3) × 95.211 g MgCl2 /1 mol MgCl2)

divided by 12.00 g sample = 0.99178 X 100 ≈ 99.18%

The chemical equation for the decomposition of water is:

\(2 H_2O -- > 2 H_2 + O_2\)

To balance this equation, we need to count the number of atoms of each element on both sides of the equation.

On the left side of the equation, we have:

2 hydrogen atoms (2 H₂O)

2 oxygen atoms (2 H₂O)

On the right side of the equation, we have:

2 hydrogen atoms (2 H₂)

2 oxygen atoms (1 O₂)

We can see that the number of hydrogen atoms is already balanced, but the number of oxygen atoms is not. To balance the equation, we need to add a coefficient in front of O2 so that we have the same number of oxygen atoms on both sides.

The balanced equation is:

\(2 H_2O -- > 2 H_2 + 1 O_2\)

A compound is broken down into simpler compounds during a decomposition reaction. Different techniques, such as heating, exposure to light, or the inclusion of a catalyst, can be used to produce this reaction.

The reactant component splits into two or more products, which may be elements or compounds, during decomposition. A synthesis reaction, in which less complex substances join to create a more complex compound, is the antithesis of this reaction.

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Answer:Make sure vyour formatting is clear and easy to understand. Remember, it’s all about helping others understand the answer.

Explanation:

Make sure your formatting is clear and easy to understand. Remember, it’s all about helping others understand the answer.

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The steps I performed:

False, using changes in tempo and dynamics can make a musical cliché more effective. Hence, option C is correct.

Tempo in a music refers to pace of the music especially in high pitch sound waves. The most common unit of measurement for tempo is beats per minute (BPM), which is just the quantity of beats that may be captured in a minute at a certain pace.

A musical segment or composition is slower when the beats per minute  is lower than when the BPM is greater. While a higher BPM is more likely to make the listener feel excited, a lower BPM is more likely to have a calming and/or sad effect on the listener.

Changing dynamics is some more effective way to make musical cliché. Hence, option C is correct.

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Answer:

A

Explanation:

I sad A because water is changeable doesn't have fixed shape or volume water depend on the area or the temperature or other things .

Answer:

Nicotinamide adenine dinucleotide

Flavin adenine dinucleotide

Explanation:

hope this helps ^^

The combination in Option D , NaCl + HCl  is not a buffer

A buffer is a solution which is added to resist changes in pH when a small amount of acid.

It is generally made of weak base with its conjugated acid ,  weak acid with its conjugated base.

A buffer comes with a defined with a capacity .

Among the given option the solution mixture  which is not a buffer is

NaCl + HCl

as a buffer is not made of a strong acid and its salt.

Therefore Option D is not a buffer.

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Answer:

It must have sunlight and water and neutrants and be fertilized

Explanation:

Answer:

This question is incomplete. A fragment of the question is missing. The fragment is:

She finds that 4.87 g of oxygen gas is produced

0.152 moles

Explanation:

Using the formula: mole = mass / molar mass

According to the question, a chemist measures the amount of oxygen gas produced during an experiment. Oxygen gas has the chemical formula: O2. Hence, the molar mass will be:

O2 = 16(2) = 32g/mol

If the mass of the oxygen gas to be 4.87 g of oxygen gas.

Therefore,

moles = 4.87/32

moles = 0.152mol

Answer:

Tyrel is learning about a certain kind of metal used to make satellites. He learns that infrared light is absorbed by the metal. X-ray light is transmitted through the metal. ... Yes, light can cause the metal to get warm because light carries energy.

According to above Information

therefore, there is a total of 0.0003048 Kilometers in 1 inch.

Answer:

there are 0.0003048km in 1 inch

Explanation:

hope it's helpful to you ☺️

Answer:

no

Explanation

95+2 does not equal 93

Answer:

No

Explanation:

Doesn't balance  

Entropy is a notion that essentially refers to the universe's propensity for chaos or the spontaneous changes that take place in everyday happenings. Here the standard entropy change for the given reaction is -233.

Entropy is typically referred to as a measurement of a system's randomness or disorder. In the year 1850, a German physicist by the name of Rudolf Clausius first proposed this idea. Entropy is a thermodynamic property that is used to characterize how a system behaves in terms of temperature, pressure, entropy, and heat capacity.

Here the standard entropy change is:

Entropy of products - entropy of reactants

ΔS = 230 - (201 + 2 ( 131)) = -233

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Answer:

The pH of the solution is 6.17.

Explanation:

To find the pH of the solution, we have to first calculate its pOH using the formula:

\(\boxed{\mathrm{pOH = - log_{10}[OH^-]}}\)

Substituting the given value of [OH⁻] into the formula, we get:

\(\mathrm{pOH = -log_{10}(1.49 \times 10^{-8})}\)

        \(= \bf 7.83\)

Now that we have the value of the pOH of the solution, we can find its pH using the following formula:

\(\boxed{\mathrm{pH + pOH = 14}}\)

∴ \(\mathrm{pH} + 7.83 = 14\)

⇒ \(\mathrm{pH } = 14 - 7.83\)

⇒ \(\mathrm{pH } = \bf 6.17\)

They can harvest electrons from their food sources, such as organic materials, and feed them into devices known as microbial fuel cells (MFC) in order to generate power. They can even create energy from ordinary soil in this way!

Bacteria act as biocatalysts in microbial fuel cells (MFCs), which use organic materials as substrate (or food for the microorganisms) and microorganisms as biocatalysts.

Therefore, Chemical energy in the substrate is transformed into usable electrical energy as the active bacteria break it down.

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Answer:

4.0 x 10 atm

In a thermonuclear device, the pressure of 0.050 liters of gas within the bomb casing reaches 4.0 x 10 atm. When the bomb casing is destroyed by the explosion, the gas is released into the atmosphere where it reaches a pressure of 1.00 atm.

If an equation includes 7(CrO₄)₂, the numbers of Cr's and O's atoms that are there are 14 and 56 respectively.

The number of atoms present in a chemical compound can be calculated by multiplying the subscript of the particular element by any coefficient.

According to this question, 7 moles of chromate with the chemical formula; (CrO₄)₂ is given. The number of oxygen and chromium atoms in this compound can be calculated as follows:

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Answer:  number of protons?

Or  different atomic weight.

I DONT KNOW ;';

The molar solubility of CuS is 7.8 x 10⁻¹⁹ M.

The solubility product expression for CuS is:

Since CuS dissociates to form one Cu²⁺ ion and one S²⁻ ion, the molar solubility of CuS can be represented as x. Therefore, at equilibrium:

Substituting these values in the Ksp expression:

Solving for x, we get:

Therefore, the molar solubility of CuS is 7.8 x 10⁻¹⁹ M.

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The complete question is:

Calculate the molar solubility, S , of CuS if it has a Ksp value of 6×10⁻³⁷.

The number of atoms that will form the given line is  1 x 10⁹ atoms.

The number of atoms that has formed the given length is calculated as follows;

number of atoms x diameter of one atom = length of the line

The given parameters include;

diameter of an atom = 500 pm = 500 x 10⁻¹² m

Length of the line = 50 cm = 0.5 m

The number of atoms that will form the given line is calculated as follows;

number of atoms  = 0.5 m / 500 x 10⁻¹² m

number of atoms  = 1 x 10⁹ atoms

Thus, the number of atoms that will form the given line is  1 x 10⁹ atoms.

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The diagram is correct because electrons are present in distinct energy levels around the nucleus. Option D

Let nus just take a minute to be able to remind ourselves that when we look at the atom that there are several subatomic particles that can be shown to be able to make up the atom. We know that the electron is the particle that can be shown to be arranged in shells.

What we saw in the inner or the core of the atom is the nucleus and the six grey spheres  that we can see there would have to do with the nucleus of the atom that is in the question.

As we now look up at the shells, we can see the electrons as they have been arranged into the respective shells were they can be found in the atom on the basis of the energy that they possess.

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Carbon disulfide:

First, we need to know this:

1 mol of CS2 = 76.13 g (this value is obtained from the molar mass)

Also,

1 mol of CS2 = 76.13 g = 6.022 x 10^23 formula units ( molecules, atoms, etc.)

We have been asked for the number of molecules in 3.500 g of CS2.

Procedure:

75.13 g of CS2 ---------------- 6.022 x 10^23 molecules of CS2

3.500 g of CS2---------------- x

Answer: 2.805x10^22 molecules of CS2

The volume of O₂ produced when 8.52 g of Na₂O₂ is added to excess water is approximately 1.17 liters at STP.

When it comes to the ideal gas law, the underlying assumption is that the gas is in a state of thermodynamic equilibrium. This means that its molecules are not interacting with each other except through perfectly elastic collisions.

Equation:

We can use stoichiometry to determine the volume of oxygen gas produced from the reaction of 8.52 g of Na₂O₂.

First, we need to convert the mass of Na₂O₂ to moles using its molar mass:

8.52 g Na₂O₂ × (1 mol Na₂O₂ / 77.98 g Na₂O₂) = 0.1093 mol Na₂O₂

According to the balanced chemical equation, 1 mole of Na₂O₂ produces 1/2 mole of O₂:

2 Na₂O₂ + 2 H₂O → 4 NaOH + O₂

1 mol Na₂O₂ produces 1/2 mol O₂

So, the number of moles of O₂ produced is:

0.1093 mol Na₂O₂ × (1/2 mol O₂ / 1 mol Na₂O₂) = 0.05465 mol O₂

Finally, we can use the ideal gas law to determine the volume of O₂ produced at standard temperature and pressure (STP), which is defined as 0°C (273 K) and 1 atmosphere (1 atm) of pressure:

PV = nRT

At STP, the pressure and temperature are known, so we can rearrange the equation to solve for V:

V = nRT / P

Plugging the values, we get:

V = (0.05465 mol) × (0.08206 L atm mol⁻¹ K⁻¹) × (273 K) / (1 atm)

V ≈ 1.17 L

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Answer:

C15 H31 O4 S

Explanation:

molecular formula is also the same because the value of "n" is 1

Compared to 2,3,4-trifluoropentane, the nonane's carbon chains are longer.

A substance's molar mass is defined as its molecular weight in grams. By adding the molar masses of a substance's constituent atoms, we may get the substance's molar mass. Then, to convert between mass and the quantity of moles of the material, we may utilize the computed molar mass.

Adding the atomic masses of a particular substance results in the calculation of molar mass. Below each element's symbol on the periodic table is a designation of the mass of that specific element. The molar mass is obtained by averaging the atomic masses obtained from the periodic table.

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45.1KJ is  the enthalpy of the given reaction.

The formation reaction of CO,NH3,HCN,H2O are-

Thus to attain the given equilibrium we reverse the equation 1 and 2 the add with 3 and 4. So ΔH of total reaction is 45.1KJ.

What is standard enthalpy of reaction?

The enthalpy change that takes place when 1 mole of a substance is created from its component elements in their standard states is known as the standard enthalpy of formation. A pure element has a standard enthalpy of production of 0 in its normal state.

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Answer: D. 6.2 Na

Explanation: Just took the test

Approximately 70.57 mL of 1.00 M NaOH should be added to 250 mL of 0.50 M CH3CO₂H to produce a buffer with a pH of 4.50.

To determine the volume of 1.00 M NaOH required to produce a buffer with a pH of 4.50 when added to 250 mL of 0.50 M CH3CO₂H, we need to consider the Henderson-Hasselbalch equation and the stoichiometry of the reaction.

The Henderson-Hasselbalch equation for a buffer solution is given as:

pH = pKa + log([A-]/[HA])

In this case, CH3CO₂H (acetic acid) acts as the weak acid (HA) and CH3COO- (acetate ion) acts as its conjugate base (A-). We are given that the desired pH is 4.50, and we can determine the pKa value for acetic acid from reference sources, which is approximately 4.75.

Using the Henderson-Hasselbalch equation, we can rearrange it to solve for the ratio [A-]/[HA]:

[A-]/[HA] = 10^(pH - pKa)

[A-]/[HA] = 10^(4.50 - 4.75) = 10^(-0.25) = 0.5623

This means that the ratio of the acetate ion to acetic acid in the buffer solution should be approximately 0.5623.

To calculate the required volume of NaOH, we need to consider the stoichiometry of the reaction. Acetic acid reacts with hydroxide ions (OH-) to form acetate ions and water:

CH3CO₂H + OH- → CH3COO- + H2O

The stoichiometric ratio between acetic acid and hydroxide ions is 1:1. Therefore, the volume of 1.00 M NaOH needed can be calculated using the equation:

Volume (NaOH) × 1.00 M = Volume (CH3CO₂H) × 0.50 M × 0.5623

Volume (NaOH) = (Volume (CH3CO₂H) × 0.50 M × 0.5623) / 1.00 M

Volume (NaOH) = (250 mL × 0.50 M × 0.5623) / 1.00 M

Volume (NaOH) ≈ 70.57 mL

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Answer:

12 moles of CO₂.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is illustrated below:

CO₂ + H₂O —> H₂CO₃

From the balanced equation above,

1 mole of CO₂ dissolves in water (H₂O) to produce 1 mole of H₂CO₃.

Finally, we shall determine the number of mole of CO₂ needed to produce 12 moles of H₂CO₃. This can be obtained as follow:

From the balanced equation above,

1 mole of CO₂ dissolves in water (H₂O) to produce 1 mole of H₂CO₃.

Therefore, 12 moles of CO₂ will also dissolves in water (H₂O) to produce 12 moles of H₂CO₃.