which set of three quantum numbers does not specify an orbital in the hydrogen atom?

Answers

Answer 1

any set of quantum numbers that violate the rules for the allowed values of n, l, and m_l will not specify a valid orbital in the hydrogen atom.

The trio of quantum numbers n = 3, l = 3, and m l = -2 do not identify an orbital in the hydrogen atom.

This is because l = 3 is an invalid quantum number for n = 3, as the value of l cannot be bigger than n-1. When n = 3, the permitted values of l are 0, 1, and 2. As m l has a value between -l and +l, the quantum number m l = -2 is acceptable for l = 2 but not for l = 3.

In summary, any set of quantum numbers that violate the rules for the allowed values of n, l, and m_l will not specify a valid orbital in the hydrogen atom.

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Related Questions

What is the ground state electron configuration for chloride ion?

Answers

The chloride ion's ground state electron configuration is [Ne] 3s2 3p6.

An atom of chlorine that has lost one electron and now has a net charge of -1 is known as a chloride ion.

The chloride ion contains 16 electrons overall due to the loss of one electron from the chlorine atom, which has 17 protons in its nucleus.

The chloride ion's atomic structure resembles that of a chlorine atom, but one electron from the 3s orbital is missing.

The chloride ion now has an electron configuration of [Ne] 3s2 3p6, with the 3s orbital having two electrons and the 3p orbital having six.

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A person expanded 500 newtons to move a full wheelbarrow 30 meters. how much work was done?

Answers

Work= force x distance
W=500n x30m
W= 15000 J or 15x10^3J ( SF)

The colligative molality of seawater is approximately 1.10 m. Calculate the vapor pressure of sea water at 20°C. The vapor pressure of pure water at 20°C is 17.54 Torr?

Answers

From the given information using the colligative property, the vapor pressure of seawater at 20°C is approximately 17.07 Torr.

To calculate the vapor pressure of seawater at 20°C, we can use the following equation:

ΔP = P°(solvent) - P(solvent)

where ΔP is the change in vapor pressure, P°(solvent) is the vapor pressure of the pure solvent (water), and P(solvent) is the vapor pressure of the solvent in the solution (seawater). We can solve for P(solvent) to get the vapor pressure of seawater.

The vapor pressure of pure water at 20°C is given as 17.54 Torr. We can assume that the seawater solution is dilute and therefore can use the following approximation:

ΔP ≈ -Km

where K is the cryoscopic constant (for water, K = 1.86 °C/m) and m is the molality of the solution.

Substituting the given values, we get:

ΔP = -Km = -1.86 °C/m × 1.10 m = -2.046 °C

To convert this temperature change to a vapor pressure change, we can use the Clausius-Clapeyron equation:

ln(P°(solvent)/P(solvent)) = ΔHvap/R × (1/T(solvent) - 1/T°)

where ΔHvap is the enthalpy of vaporization of the solvent, R is the gas constant, T(solvent) is the temperature of the solvent in kelvin (20 + 273 = 293 K), and T° is the normal boiling point of the solvent (100°C or 373 K for water).

We can solve for P(solvent) to get:

P(solvent) = P°(solvent) × exp(-ΔHvap/R × (1/T(solvent) - 1/T°))

The enthalpy of vaporization of water is approximately 40.7 kJ/mol, and R is 0.08206 L·atm/mol·K.

Substituting the values, we get:

P(solvent) = 17.54 Torr × exp(-40700 J/mol / (0.08206 L·atm/mol·K × 293 K) × (1/293 K - 1/373 K)) = 17.07 Torr

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at ph 9.0, what is the major form of each ionizable group? a. n-terminus: ammonium; lysine r group: ammonium; c-terminus: carboxylate; aspartic acid r group: carboxylate b. n-terminus: amine; lysine r group: ammonium; c-terminus: carboxylate; aspartic acid r group: carboxylate c. n-terminus: amine; lysine r group: ammonium; c-terminus: carboxylic acid; aspartic acid r group: carboxylate d. n-terminus: amine; lysine r group: ammonium; c-terminus: carboxylic acid; aspartic acid r group: carboxylic acid

Answers

At pH 9.0, the solution is basic and the ionizable groups in the peptide will be ionized. The correct answer is option b: n-terminus: amine; lysine r group: ammonium; c-terminus: carboxylate; aspartic acid r group: carboxylate.

Ionization of Peptide at pH 9.0

At pH 9.0, the ionizable groups in a peptide are likely to be ionized. The pKa values of the different ionizable groups in the peptide determine which form they will be in at a given pH. The amino group at the N-terminus of the peptide has a pKa value of about 9.0, which means that it will mostly exist in the ionized form as an amine (NH2) at pH 9.0. The lysine R group has a pKa value of approximately 10.8, which means that it will exist in the ionized form as ammonium (NH3+) at pH 9.0. The carboxyl group at the C-terminus of the peptide has a pKa value of around 2.2, which means that it will exist in the ionized form as a carboxylate (COO-) at pH 9.0. The aspartic acid R group has a pKa value of about 3.9, which means that it will also exist in the ionized form as a carboxylate (COO-) at pH 9.0. Therefore, at pH 9.0, the major forms of each ionizable group in a peptide are N-terminus - amine (NH2), Lysine R group - ammonium (NH3+), C-terminus - carboxylate (COO-), and Aspartic acid R group - carboxylate (COO-). Understanding the ionization of peptides at different pH values is important in many biochemical and biophysical studies that involve peptides and proteins.

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The following orbital notation is for which element?

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The following orbital notation is for the element O (Oxygen).

What is an orbital notation?

Orbital notation is a way to describe the electron configuration of an atom. It consists of a combination of symbols and numbers that represent the energy level, type of orbital, and the number of electrons contained in that orbital.

The notation uses the letter symbols "s," "p," "d," and "f" to represent the different types of orbitals, and a superscript to indicate the number of electrons in the orbital. For example, the orbital notation for a carbon atom is "1s2 2s2 2p2," indicating that there are two electrons in the 1s orbital, two electrons in the 2s orbital, and two electrons in the 2p orbital.

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Which of the following is a molecular formula?
C₂H₁₁
P4010
C₂H₁₂O
P₂O5

Answers

The option that exemplifies a molecular formula is [tex]P_4O_{10[/tex].

What are molecular formulas?

A molecular formula is a chemical formula that represents the number and type of atoms present in a molecule. A molecular formula specifies the exact number of atoms of each element in a molecule, which can help to identify the type of molecule and its composition.

Molecular formulas are unique from empirical formulas. Empirical formulas are the simplest formulas that show the atoms present in a compound in their simplest whole-number ratios.

Thus, C₂H₁₁, C₂H₁₂O, and [tex]P_2O_5[/tex] are all empirical formulas while [tex]P_4O_{10[/tex] is a molecular formula.

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A reaction and its experimentally determined rate law are represented above. A chemist proposes two different possible mechanisms for the reaction, which are given below.
Mechanism 1
X2 → 2 X (slow)
X + Y2 → XY2 (fast) X + XY2 → X2Y2 (fast)
Mechanism 2
X2 → 2 X (slow)
X + Y2 → XY + Y (fast) X + XY → X2Y (fast)
X2Y + Y → X2Y2 (fast) Based on the information above, which of the following is true?Both mechanism 1 and 2 are consistent with the rate law.Only mechanism 2 is consistent with the rate law.Neither mechanism 1 nor mechanism 2 is consistent with the rate law.Only mechanism 1 is consistent with the rate law

Answers

As mechanism 2 matches the given rate law, the correct answer is: only mechanism 2 is consistent with the rate law.

To determine which mechanism is consistent with the experimentally determined rate law, we need to check if the predicted rate law for each mechanism matches the given rate law.

The given rate law is: rate = k [X][Y₂]

Mechanism 1:

The slow step is the formation of X radicals from X₂, which is a bimolecular reaction. The intermediate X formed in the first step then reacts with Y₂ to form XY₂, and this intermediate reacts with X to form the final product X₂Y₂. Since the rate-determining step involves only X₂, we can assume that the rate law is determined by the concentration of X₂ only, and the rate law for mechanism 1 is therefore: rate = k[X₂]. This does not match the given rate law, so mechanism 1 is not consistent with the rate law.

Mechanism 2:

The slow step is again the formation of X radicals from X₂. The intermediate XY formed in the second step then reacts with Y to form X₂Y, and this intermediate reacts with Y to form the final product X₂Y₂. The rate-determining step involves X₂, XY, and Y, so we can write the rate law for mechanism 2 as:

rate = k [X₂][XY][Y].

Simplifying this rate law using the equilibrium constant for the fast equilibrium XY₂ ⇌ XY + Y₂, we can rewrite it as:

rate = k [X₂][Y₂]/K

This matches the given rate law, so mechanism 2 is consistent with the rate law.

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PLS HELP TY <33333 -Some of the newer radiation techniques used to treat brain tumors are able to reduce the negative side effects of the treatment. Which of the following advances would be most likely to decrease the side effects of radiation treatment?
A.
narrower radiation beams
B.
stronger radiation beams
C.
larger radiation beams
D.
longer radiation beams

Answers

Answer:

A

Explanation:

A. Narrower radiation beams are most likely to decrease the side effects of radiation treatment. This is because the use of narrower beams helps to reduce the exposure of surrounding healthy tissue to the radiation, which in turn reduces the risk of negative side effects such as fatigue, skin irritation, and cognitive decline.

why are atomic absorption lines sharper than the absorption spectrum of a molecule dissolved in solution?

Answers

Atomic absorption lines are sharper than the absorption spectrum of a molecule dissolved in solution because Atomic spectra are pure electronic spectra.

Atomic spectra are pure electronic spectra  where as molecular spectra are a combination of electronic, vibrational and microwave spectra which makes the absorption spectrum of a molecule broad.

The presence of spectral lines is explained by amount mechanics in terms of the energy situations of tittles, ions and motes. These energy situations depend on the figures of protons, electrons and neutrons in an snippet, and the limited set of configurations in which these essential patches can live( the set of amount figures). tittles prefer to be in their ground state, where all of the electrons are located as close to the nexus as possible.

Absorption lines do when an snippet, element or patch absorbs a photon with an energy equal to the difference between two energy situations. This causes an electron to be promoted into a advanced energy position, and the snippet, element or patch is said to be in an agitated state.

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The excess reagent that results from a chemical reaction is measured in:

moles?
liters?
moles/mass of the reagent?
grams?
which of the above

Answers

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Explanation: its moles

How does the data you collected in experiment 1 using propane gas compare to the data you collected in experiment 2 using butane? in both experiments, the pressure values from propane gas and butane gas were the same after each addition of water. The pressure values after each addition of water were very different for propane and butane, but one gas did not consistently have a higher pressure than the other. The pressure values from propane gas were higher than the pressure values from butane gas after each addition of water. The pressure values from propane gas were lower than the pressure values from butane gas after each addition of water

Answers

The pressure values for propane and butane after each addition of water were not always the same.

This is due to the fact that the vapor pressure of a liquid is directly related to its boiling point. Propane has a boiling point of -42.1°C, whereas butane has a boiling point of 0.5°C. This means that at a given temperature, propane will have a higher vapor pressure than butane, resulting in higher pressure values when the same amount of water is added to each gas. This can be expressed mathematically by the Clausius-Clapeyron equation, which states that the vapor pressure of a liquid is directly proportional to its temperature.

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What can an element in activity series replace?

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An element in activity series can replace the more reactive elements  Because of this, the single replacement reaction occurs.

The activity series is defined as a list of elements in decreasing order of their reactivity. In a single replacement reaction, a given element is capable of replacing an element that is below it in the activity series. It can be used to predict if a reaction will occur. This reactions only occur when the element that is doing the replacing is more reactive than the element that is being replaced. It is useful to have a list of elements in order of their relative reactivities. The activity series defined as a list of elements in decreasing order of their reactivity. Since metals replace other metals while nonmetals replace other nonmetals and elements replace elements they each have a separate activity series.

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What happened to the shape of some objects when force was applied to them

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When force is applied to the objects, then the shape of some objects deforms. It modifies the relative locations of the crystal lattice's constituent particles.

Interatomic or intermolecular forces begin to operate as soon as that occurs, and they have a tendency to return the solid to its former configuration. Force is defined as a physical quantity that has the power to alter an object's condition and shape. A force imparted to an object causes it to alter shape. For instance, a piece of metal changes shape when hit with a hammer. A contact force that is applied to an object externally is referred to as an applied force. The object moves or deforms as a result of the applied force. In general, an object moves in the direction of a force. Assume a pulley is used to raise it off the ground. In that situation, the object is moving in the opposite direction from where the force is being applied.

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how many moles of calcium in 0.5 mole ca3(po4)2

Answers

There are 1.5 moles of calcium in 0.5 mole Ca3(PO4)2.

How to determine the number of moles of calcium in 0.5 mole Ca3(PO4)2

First we need to first find the molar mass of Ca3(PO4)2:

Molar mass of Ca3(PO4)2 = (3 x molar mass of Ca) + (2 x molar mass of PO4)

= (3 x 40.08 g/mol) + (2 x (1 x 30.97 g/mol + 4 x 16.00 g/mol))

= 310.18 g/mol

Next, we can use the following mole ratio:

3 moles of Ca / 1 mole of Ca3(PO4)2

This means that for every 1 mole of Ca3(PO4)2, there are 3 moles of Ca.

Therefore, the number of moles of calcium in 0.5 mole Ca3(PO4)2 is:

0.5 mole Ca3(PO4)2 x (3 moles of Ca / 1 mole of Ca3(PO4)2) = 1.5 moles of Ca

Therefore, there are 1.5 moles of calcium in 0.5 mole Ca3(PO4)2.

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after drinking multiple energy drinks in one sitting, your stomach begins to produce excess acid to compensate. this lowers your stomach ph from 2.0 to 1.8. aspirin has a pka of 3.0 and is only absorbed in its protonated form. what percent of aspirin will be absorbed given a stomach ph of 1.8?

Answers

Lowers your stomach ph from 2.0 to 1.8. aspirin only absorbs in its protonated state and has a pka of 3.0,very small percentage of the aspirin will be absorbed  given a stomach ph of 1.8.

The first step is to determine the ratio of protonated to deprotonated aspirin in the acidic environment of the stomach. This can be done using the Henderson-Hasselbalch equation, which relates the pH, pKa, and the ratio of protonated to deprotonated forms of a weak acid:

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

[HA]/[A-] = 10^(pH - pKa) = 10^(1.8 - 3.0) = 0.014

Therefore, only a very small percentage of the aspirin will be absorbed in its protonated form, and the majority will remain in the deprotonated form and be excreted from the body. This may decrease the effectiveness of the aspirin as a pain reliever or anti-inflammatory agent.

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question 1
pls help asap

Answers

6.0 moles of magnesium (Mg) metal would be produced if 12 moles of potassium (K) reacted.

What is magnesium?

Magnesium is a chemical element with the symbol Mg and atomic number 12. It is a silvery-white, shiny, and highly reactive metal. Magnesium is the ninth most abundant element in the universe and the eighth most abundant element in the Earth's crust. Magnesium is an essential mineral and is particularly important for human metabolism, being involved in over 300 biochemical reactions. It is required for the proper functioning of muscles, nerves, and enzymes and helps to regulate blood sugar levels, blood pressure, and the body's calcium levels.

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suppose 0.450 l of 0.450 m h2so4 is mixed with 0.400 l of 0.270 m koh . what concentration of sulfuric acid remains after neutralization?

Answers

The concentration of sulfuric acid remaining after neutralization is 0 M.

First, we need to determine the number of moles of [tex]H_{2} SO_{4}[/tex] and KOH that are present in the solution.

The number of moles of [tex]H_{2} SO_{4}[/tex] in 0.450 L of 0.450 M solution can be calculated as follows:

moles [tex]H_{2} SO_{4}[/tex] = volume of solution (L) x molarity

moles [tex]H_{2} SO_{4}[/tex] = 0.450 L x 0.450 mol/L

moles [tex]H_{2} SO_{4}[/tex] = 0.2025 mol

Similarly, the number of moles of KOH in 0.400 L of 0.270 M solution can be calculated as follows:

moles KOH = volume of solution (L) x molarity

moles KOH = 0.400 L x 0.270 mol/L

moles KOH = 0.108 mol

The balanced chemical equation for the reaction between [tex]H_{2} SO_{4}[/tex] and KOH is:

[tex]H_{2} SO_{4}[/tex] + 2KOH → [tex]K_{2} SO_{4}[/tex] + [tex]2H_{2} O[/tex]

From the equation, we can see that 1 mole of [tex]H_{2} SO_{4}[/tex] reacts with 2 moles of KOH. Since the number of moles of KOH (0.108 mol) is less than half the number of moles of [tex]H_{2} SO_{4}[/tex] (0.2025 mol), KOH is the limiting reactant.

The reaction between [tex]H_{2} SO_{4}[/tex] and KOH consumes all of the KOH and produces [tex]K_{2} SO_{4}[/tex] and [tex]H_{2} O[/tex].

The number of moles of [tex]H_{2} SO_{4}[/tex] that reacts with KOH is:

moles [tex]H_{2} SO_{4}[/tex] consumed = 2 x moles KOH

moles [tex]H_{2} SO_{4}[/tex] consumed = 2 x 0.108 mol

moles [tex]H_{2} SO_{4}[/tex] consumed = 0.216 mol

The number of moles of [tex]H_{2} SO_{4}[/tex]that remain after neutralization is:

moles [tex]H_{2} SO_{4}[/tex] remaining = initial moles [tex]H_{2} SO_{4}[/tex] - moles [tex]H_{2} SO_{4}[/tex] consumed

moles [tex]H_{2} SO_{4}[/tex] remaining = 0.2025 mol - 0.216 mol

moles [tex]H_{2} SO_{4}[/tex] remaining = -0.0135 mol

Since we cannot have a negative number of moles, this means that all of them [tex]H_{2} SO_{4}[/tex] has been consumed and there is an excess of KOH remaining.

Therefore, the concentration of sulfuric acid remaining after neutralization is 0 M.

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The equilibrium SO₂Cl₂ (g) --> SO₂ (g) + Cl₂ (g) is attained at 25 °C in a closed container.
When the concentration of Cl₂ is increased keeping the temperature constant, which of the following statements are correct?
a) Concentration of SO₂ is increased
b) Concentration of SO₂Cl2 is decreased
c) Concentration of SO₂ is decreased
d) None of the above

Answers

Answer:The correct statement is b) Concentration of SO2Cl2 is decreased.

Explanation:The equilibrium expression for the reaction can be written as follows:

Kc = [SO2Cl2] / [SO2] [Cl2]

At equilibrium, the concentration of reactants and products remain constant. When the concentration of Cl2 is increased while keeping the temperature constant, the reaction will shift to the right in order to consume the excess Cl2. This will result in an increase in the concentration of SO2 and a decrease in the concentration of SO2Cl2.

So, the correct statement is b) Concentration of SO2Cl2 is decreased.

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a sample of trifluoroacetic acid, c2hf3o2, contains 88.9 88.9 g of oxygen. calculate the mass of the trifluoroacetic acid sample.

Answers

a sample of trifluoroacetic acid, c2hf3o2, contains 88.9 88.9 g of oxygen, the mass of the trifluoroacetic acid sample is: 316.484 grams

What is molar mass?

The mass in grams of one mole of a chemical is its molar mass. A mole is the measurement of the number of things, such as atoms, molecules, and ions, that are present in a material. It provides you with the amount of grams per mole of a substance, to put it another way. The molar mass of a material is a bulk attribute rather than a molecular one. The fundamental units of matter are called atoms, and by joining atoms together, molecules are created. Chemists use the term "mole" because atoms, molecules, and other particles are all very tiny and require a large amount to even weigh them.

As we know,

1 mole of C₂HF₃O₂ contains 2 moles of oxygen

molar mass of C₂HF₃O₂ = 114.0 gm

atomic mass of 2 Oxygen = 32 gm

(114 / 32) = 3.56

grams of C₂HF₃O₂ = 88.9 x 3.56 = 316.484 grams

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which example involves a colligative property? responses pouring salt on an icy sidewalk to make it free of ice pouring salt on an icy sidewalk to make it free of ice transferring some of a concentrated solution into a dilute solution transferring some of a concentrated solution into a dilute solution bringing a carbonated beverage to room temperature bringing a carbonated beverage to room temperature heating a pure solvent to boiling

Answers

Pouring salt on an icy sidewalk to make it free of ice is an example of a colligative property. Colligative properties are properties of solutions that depend on the concentration of solute particles, but not on their identity.

Four common colligative properties are:

Freezing point depression: The freezing point of a solution is lower than the freezing point of the pure solvent.Boiling point elevation: The boiling point of a solution is higher than the boiling point of the pure solvent.Osmotic pressure: The pressure required to prevent osmosis, the flow of solvent from a region of low solute concentration to a region of high solute concentration, across a semipermeable membrane.Vapor pressure lowering: The vapor pressure of a solution is lower than the vapor pressure of the pure solvent.

Pouring salt on an icy sidewalk to make it free of ice is an example of freezing point depression. The salt dissolves in the water on the surface of the ice and forms a solution. The presence of salt in the water lowers the freezing point of the water, causing it to melt even at temperatures below the normal freezing point of pure water. This effect is due to the increased number of solute particles in the solution, which interferes with the formation of the crystal lattice of ice.

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A high altitiude balloon contains 30.0 L of He gas at 103kPa. What is the volume when the balloon rises to an altitiude where the pressure is only 25.0kPa? Assume the temp is constant. (BOYLES LAW) 15 points pls help

Answers

124 L is the correct answer

Thus, the volume of the helium is 124 L when the balloon rises to an altitude where the pressure is only 25 kPa.

What is temperature ?

Temperature is a measure of the thermal energy of a substance or system. It reflects the degree of hotness or coldness of a material, and is a crucial parameter in many physical and biological systems. It is usually measured in units of kelvins, Celsius, or Fahrenheit. The Kelvin scale is an absolute temperature scale, where 0 K represents absolute zero, the temperature at which all matter has no thermal energy. The Celsius and Fahrenheit scales are relative temperature scales, with 0°C and 32°F defined as the freezing point of water and 100°C and 212°F defined as the boiling point of water.

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which of the following statements describes lattice energy? select the correct answer below: it is the energy stored in the intermolecular attractions that hold particles together in an ionic solid. it is the energy of a solute. it is the amount of enthalpy change that occurs when 1mol of ionic solid is converted into gaseous ions. all of the above

Answers

Option A: It is the amount of energy stored in the intermolecular attractions that hold particles together in an ionic solid, and option C: it is the amount of enthalpy change that occurs when 1mol of ionic solid is converted into gaseous ions, describes lattice energy.

The enthalpy change required to convert one mole of an ionic solid into gaseous ionic components is known as lattice energy. The strength of the ionic bonds in an ionic compound is gauged by lattice energy. It holds the particles together in a molecule. Thus, option A and C describes lattice energy. It sheds light on a number of ionic solids' characteristics, such as their solubility, hardness, and volatility.

The lattice energy of an ionic solid cannot be measured directly, but only be detected with Born-Haber cycle. It is expressed in terms of kilo-joule per mole, KJ/mol.

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After the correct formula for a reactant in an equation has been written, the:
A. Subscripts are adjusted to balance the equation
B. Formula should not be changed
C. Same formula must appear as the product
D. Symbols in the formula must not appear on the product side of the equation

Answers

Once a reactant's correct formula has been placed in an equation, the A. The equation is balanced by adjusting the subscripts.

The correct formula for a reactant in a chemical equation must be written first, and then the subscripts are adjusted to balance the equation. Balancing the equation means making sure that the same number of each type of atom appears on both the reactant and product sides of the equation. This can be done by adding coefficients in front of the formulas as necessary. Once the equation is balanced, the formula should not be changed. The same formula must appear on both the reactant and product sides of the equation, but the coefficients may be different. The symbols in the formula must not appear on the product side of the equation unless the formula has been balanced first.

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if you started with a 125g sample of u-235, how much of the sample would be remaining after 3 half-lives and how many years would have passed?

Answers

After 3 half-lives, only 15.625 grams of the original 125-gram sample of U-235 would remain, and approximately 2.1114 billion years would have passed. It's worth noting that this calculation assumes that the decay of U-235 follows a constant exponential decay, which may not be entirely accurate due to variations in decay rates over time.

What is Half Life Reaction?

Half-life is a term commonly used in nuclear physics and chemistry to describe the time required for half of the atoms in a particular sample to decay. In a half-life reaction, the amount of a substance or reactant present in a reaction is reduced by half after a specific amount of time.

In a chemical reaction, the half-life refers to the amount of time it takes for half of the reactants to be converted into products. The half-life of a chemical reaction is dependent on a variety of factors, including temperature, pressure, concentration, and the specific chemical reaction taking place.

After one half-life, half of the original U-235 sample would remain, which would be 62.5 grams (125 g / 2). After two half-lives, only one-quarter (or 25%) of the original sample would remain, which would be 31.25 grams (62.5 g / 2). After three half-lives, only one-eighth (or 12.5%) of the original sample would remain, which would be 15.625 grams (31.25 g / 2).

To determine how much time has passed, we can use the formula:

t = n x t1/2

where t is the total time, n is the number of half-lives, and t1/2 is the half-life of the substance.

In this case, we have n = 3 and t1/2 = 703.8 million years. Therefore, the total time that has passed would be:

t = 3 x 703.8 million years

t = 2.1114 billion years

So, after 3 half-lives, only 15.625 grams of the original 125-gram sample of U-235 would remain, and approximately 2.1114 billion years would have passed. It's worth noting that this calculation assumes that the decay of U-235 follows a constant exponential decay, which may not be entirely accurate due to variations in decay rates over time.

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625 grams of aluminum metal is reacted with 450. grams of iron (iii) oxide in the presence of heat. calculate the number of grams of all species present after the reaction.

Answers

There a number of grams of all species present after the reaction, there are 287.4 g of aluminum oxide, 315.4 g of iron, and 34.12 g of aluminum remaining.

Calculation of the number of grams of all species present after the reaction

To determine the products of the reaction, we need to write the balanced chemical equation:

2 Al + Fe2O3 → Al2O3 + 2 Fe

From the equation, we see that two moles of aluminum react with one mole of iron (III) oxide to produce one mole of aluminum oxide and two moles of iron.

To calculate the number of grams of each species present after the reaction, we need to determine the limiting reagent, which is the reactant that is completely consumed and limits the amount of product that can be formed.

The number of moles of each reactant can be calculated using their respective molar masses:

Moles of aluminum = 625 g / 26.98 g/mol = 23.16 mol

Moles of iron (III) oxide = 450 g / 159.69 g/mol = 2.82 mol

The stoichiometry of the balanced equation tells us that 2 moles of aluminum react with 1 mole of iron (III) oxide, so aluminum is in excess. Therefore, iron (III) oxide is the limiting reagent.

The amount of product formed can be calculated using the mole ratio from the balanced equation:

Moles of aluminum oxide produced = 2.82 mol Fe2O3 × (1 mol Al2O3 / 1 mol Fe2O3) = 2.82 mol Al2O3

Moles of iron produced = 2 × 2.82 mol Fe2O3 × (1 mol Fe / 1 mol Fe2O3) = 5.64 mol Fe

To calculate the mass of each species, we need to multiply the number of moles by their respective molar masses:

Mass of aluminum oxide produced = 2.82 mol Al2O3 × 101.96 g/mol = 287.4 g

Mass of iron produced = 5.64 mol Fe × 55.85 g/mol = 315.4 g

Mass of aluminum remaining = 625 g - (23.16 mol Al × 26.98 g/mol) = 34.12 g

Therefore, after the reaction, there are 287.4 g of aluminum oxide, 315.4 g of iron, and 34.12 g of aluminum remaining.

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write a brief conclusion to the experiment summarizing the experimental conditions that gave rise to the greatest observed electrical conductivity.

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A brief conclusion to the experiment summarizing the experimental conditions that gave rise to the greatest observed electrical conductivity:

To observe electrical conductivity of substances in colorful waterless resultsTo determine of the result is a strong or weak electrolyteTo interpret a chemical response by observing waterless result conductivity.

Electrical conductivity is grounded on the inflow of electrons. Essence are good operators of electricity because they allow electrons to flow through the entire piece of material. therefore, electrons flow like a “ ocean of electrons ” through essence. In comparison, distilled water is a veritably poor captain of electricity since veritably little electricity flows through water. largely ionized substances are strong electrolytes. Strong acids and mariners are strong electrolytes because they fully ionize( disconnect or separate) in result. The ions carry the electric charge through the result therefore creating an electric current.

Slightly ionized substances are weak electrolytes. Weak acids and bases would be distributed as weak electrolytes because they don't fully disconnect in result.

Substances that don't conduct an electric current are called non-electrolytes. Non-electrolytes don't ionize; they don't contain portable ions. The LEDs of a conductivity cadence won't light because there are no ions to carry the electric current. The table below lists exemplifications of strong, weak and non-electrolytes.

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a water molecule stays in a living organism for about how long?

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A water molecule typically stays in a living organism for a relatively short amount of time, typically a few minutes.

This is because water molecules are constantly being exchanged between different parts of the organism and the environment. Inside the organism, water molecules move in and out of cells, tissues and organs, and are also exchanged with the atmosphere. The process of exchanging water molecules between the organism and its environment is known as the water cycle. This cycle involves water molecules evaporating into the atmosphere, condensing, and then falling back down to Earth as rain or snow, where it is taken up by plants and animals, and then released back into the atmosphere. Water molecules are also exchanged between living organisms and their environment through diffusion, which is the movement of molecules from an area of higher concentration to an area of lower concentration. Therefore, even though a water molecule may stay in a living organism for a few minutes, it is constantly cycling through the organism and its environment.

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how many atoms are there in 5.90 moles of calcium

Answers

Answer:

3.55x10^24 atoms Ca

Explanation:

Use Avogadro's number: 6.022 x 10^23

5.90molsCa x (6.022x10^23/1mol) = 3.55x10^24

The
following are all the transformations of energy that occur in a power plant. Place these transformations in order from the beginning (at the top) to the generator
(at the bottom) by dragging and dropping the options into the correct order.
= mechanical energy is converted to electrical energy
= nuclear or chemical energy is converted to thermal (heat) energy
= kinetic energy is converted to mechanical energy
thermal (heat) energy is converted to kinetic energy

Answers

Here is the correct order of the transformations of energy in a power plant, from the beginning (top) to the generator (bottom):

Thermal (heat) energy is created by converting nuclear or chemical energy.

Kinetic energy is created from thermal (heat) energy.

Kinetic energy is converted to mechanical energy

Mechanical energy is converted to electrical energy

This is a generalized order and may vary depending on the specific type of power plant.

What is Power Plant?

A power plant is a facility that is designed to generate electricity from various sources of energy, such as fossil fuels (coal, oil, and natural gas), nuclear energy, hydroelectric power, wind power, solar power, and geothermal energy. The main function of a power plant is to convert the energy from its source into electrical energy that can be used to power homes, businesses, and other facilities.

The process of generating electricity in a power plant typically involves several steps, including the production of heat or mechanical energy from the source of energy, the use of turbines to convert this energy into rotational energy, and the use of generators to convert this rotational energy into electrical energy. Power plants may also include various other components, such as cooling systems, transformers, and transmission lines, to ensure the efficient and reliable distribution of electrical power to the end users.

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the dependence of the rate constant on temperature is expressed by which equation?
The Arrhenius equation. The de Broglie equation. The van't Hoff equation. Temperature has no effect on the rate constant.

Answers

The dependence of the rate constant on temperature is expressed by equation i.e. The Arrhenius equation. Hence, the correct option is (a).

The dependence of the rate constant on temperature is expressed by the Arrhenius equation. The Arrhenius equation is a simple mathematical relationship that describes the temperature dependence of the rate constant, k, of a chemical reaction. The equation is given by:

[tex]k = Ae^(-Ea/RT)[/tex]

here,

A is pre-exponential factor,

Ea is activation energy,

R is gas constant,

T is temperature (Kelvin)

The Arrhenius equation states that the rate constant of a reaction increases exponentially with temperature. This means that as the temperature increases, the rate constant also increases, resulting in an increase in the reaction rate. The de Broglie equation describes the relationship between the wavelength and momentum of a particle and is not related to the rate constant of a chemical reaction. The van't Hoff equation is related to the Arrhenius equation and is used to describe the relationship between the reaction rate and temperature for a reaction in solution.

Hence, the Arrhenius equation is the equation that expresses the dependence of the rate constant on temperature.

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Question - The dependence of the rate constant on temperature is expressed by which equation? Choose the correct answer.

(a) The Arrhenius equation.

(b) The de Broglie equation.

(c) The van't Hoff equation.

(d) Temperature has no effect on the rate constant.

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