Which model of an atom accounted for the mass of the atom and a balanced charge

The given chloride level in Michelle's blood is 0.55 g/dL. Now we need to convert this value into milliequivalents per liter.

Chloride has a molar mass of 35.45 g/mol. The equation for calculating milliequivalents per liter is:milliequivalents per liter (mEq/L) = (mass in g / molar mass) x 10So, milliequivalents per liter (mEq/L) of Michelle's blood is:0.55 g/dL = 0.55 x 10 / 35.45 mEq/L (since 1 dL = 1000 mL)0.55 x 10 / 35.45 ≈ 0.1561 (rounded to four significant figures)So, the value of chloride level in milliequivalents per liter in Michelle's blood is approximately 0.1561 mEq/L (to two significant figures, the answer is 0.16 mEq/L).Thus, the correct answer is IVAL 0.16 mEq/L.

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To find the molality of the resulting solution, we need to calculate the number of moles of solute (NaCl) and the mass of the solvent (H2O).

Given:

Number of moles of NaCl (solute) = 0.250 mol

Mass of H2O (solvent) = 2.05 kg

Molality (m) is defined as the moles of solute per kilogram of solvent. Therefore, we can use the following formula to calculate the molality:

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

First, let's convert the mass of the solvent from kilograms to grams:

Mass of H2O = 2.05 kg * 1000 g/kg = 2050 g

Now we can calculate the molality:

molality (m) = 0.250 mol / 2.050 kg = 0.122 mol/kg

Therefore, the molality of the resulting solution is 0.122 mol/kg.

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Answer: Carbon Monoxide (CO), Sulfur Dioxide (SO2), and Nitrogen Dioxide(NO2).

Explanation:

Exposure to these noxious gases severely affects the respiratory system of an individual thus deteriorating his health. Pneumonia and Bronchitis are the tips of an iceberg among various diseases and prolonged illnesses.

The shell model is a simplified model of the atomic nucleus that is not very accurate in predicting the behavior of complex atoms. However, it is still presented in many introductory physics and chemistry courses because it provides a useful framework for understanding the properties of atoms and their electrons.

The shell model allows students to understand the basic structure of an atom and how electrons fill energy levels, which is a key concept in chemistry. While the model is not perfect, it is a good starting point for students to build their understanding of atomic structure and learn about more complex models later on.

Additionally, the shell model is still used in some applications, such as nuclear magnetic resonance (NMR) spectroscopy, where it provides a useful approximation of atomic behavior.

Overall, while the shell model may not be the most accurate representation of atomic structure, it is still a valuable tool for teaching and learning about the behavior of atoms and their electrons.

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Answer:

A

Explanation:

Fusion combines light elements.

The mass of benzene required to produce 3.50 L of carbon dioxide gas, CO₂ at STP in the reaction is 2.028 grams

First, we shall obtain the mole of carbon dioxide gas, CO₂ produced at STP. Details below:

At STP,

22.4 Liters = 1 mole of CO₂

Therefore,

3.5 liters = 3.5 / 22.4

3.5 liters = 0.156 mole of CO₂

Next, we shall obtain the mole of benzene, C₆H₆ required. Details below:

2C₆H₆ + 15O₂  -> 12CO₂ + 6H₂O

From the balanced equation above,

12 moles of CO₂ were obtained from 2 moles of C₆H₆

Therefore,

0.156 mole of CO₂ will be obtain from = (0.156 × 2) / 12 = 0.026 mole of C₆H₆

Finally, we shall obtain the mass of benzene, C₆H₆ required for the reaction. Details below:

Mass = Mole × molar mass

Mass of C₆H₆ = 0.026 × 78

Mass of C₆H₆ = 2.028 grams

Thus, the mass of benzene, C₆H₆ required is 2.028 grams

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Answer:

Method: Measure out 25 cm3 of 0.5 mol dm3 lead(II)nitrate solution and add it to a small beaker. Measure out 25 cm3 of 0.5 mol dm3 of potassium sulfate add it to the beaker and mix together using a stirring rod.

Answer:

down syndrome is research because you research the three sets of chromosome 21

Explanation:

The first reaction in glycolysis that results in the formation of an energy-rich compound is catalyzed by the enzyme hexokinase.

Hexokinase phosphorylates glucose, converting it into glucose-6-phosphate. This reaction requires the input of one molecule of ATP, which is hydrolyzed to ADP and inorganic phosphate (Pi) during the process. The phosphorylation of glucose is an important step because it traps glucose inside the cell and activates it for further metabolic pathways.

Hexokinase has a high affinity for glucose, ensuring efficient phosphorylation even at low glucose concentrations. The addition of the phosphate group to glucose creates a high-energy bond, which makes glucose-6-phosphate a more reactive and chemically unstable molecule compared to glucose.

This energy-rich compound can be further metabolized in glycolysis to generate ATP through substrate-level phosphorylation and eventually leads to the production of pyruvate, which can be used for various cellular processes or further energy production in aerobic respiration.

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RbClO₄ is most likely to be more soluble in an acidic solution than in pure water. Therefore, option A is correct.

The solubility of salts can be influenced by the pH of the solution. In general, salts that contain anions derived from weak acids tend to be more soluble in acidic solutions compared to pure water.

Based on this information, the salt that is most likely to be more soluble in an acidic solution among the options provided is:

RbClO₄ contains the perchlorate anion (ClO⁴-), which is derived from perchloric acid, a strong acid. Salts derived from strong acids and weak bases tend to be highly soluble in water and may have increased solubility in acidic solutions.

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The pH of a buffer solution containing 0.25 M NH3 and 0.45 M NH4Cl can be calculated using the Henderson-Hasselbalch equation: pH = pKa + log([NH4Cl]/[NH3]), where pKa is the dissociation constant of NH4+ (9.25 at 25°C).

The concentration ratio [NH4Cl]/[NH3] is 0.45/0.25 = 1.8. Plugging these values into the equation gives pH = 9.25 + log(1.8) = 9.62.
If 2 mL of 0.2 M NaOH is added to 75 mL of this buffer, the new concentration of NH3 will be 0.25 M and the new concentration of NH4Cl will be 0.45 M + (2 mL/1000 mL)(0.2 M) = 0.494 M. The new concentration ratio [NH4Cl]/[NH3] is 0.494/0.25 = 1.976. Plugging this ratio into the Henderson-Hasselbalch equation gives pH = 9.25 + log(1.976) = 9.68.

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The reaction of potassium in water is similar to that of sodium in water, but more violent because Potassium is a very reactive metal even more than sodium as it is present below the sodium in periodic table.

As we go down the group in the periodic table, size of the elements increases but valence electrons remain same. This leads to decrease in ionization energy and hence electron can easily be removed and metal will be more reactive.

Therefore, The reaction of potassium in water is similar to that of sodium in water, but more violent because Potassium is a very reactive metal.

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Answer:

1 Zn + 2 HCl ⇒ 1 H₂ + 1 ZnCl₂

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If 2 grams of water absorbs 20 calories of heat (assume not during a state change), the resulting water temperature change is - 272.975 °C .

Calculation ,

Formula used : Q = m × Cp × change in temperature

Q = m × Cp × ΔT           ( i )

Where Q is the heat supplied in calories = 20 cal ( given )

m is the mass of water in gram = 2 g  ( given )

Cp is the specific heat capacity of water  at constant pressure = 1 cal / gK ( known )

Thus , after putting the value of heat supplied in calories ,  mass of water and specific heat capacity of water in equation ( i ) we get the value of change in temperature .

1 cal / gK  = 2 g × 20 cal × ΔT

 ΔT = 1 cal / gK / 2 g × 20 cal = 0.025 K

  ΔT = 0.025 K - 273 = - 272.975 °C

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It is not possible for two electrons to have the same set of all four quantum numbers in an atom, as it would violate the Pauli exclusion principle.

According to the Pauli exclusion principle, no two electrons in an atom can have the same set of all four quantum numbers. The four quantum numbers used to describe an electron's state are the principal quantum number (n), the azimuthal quantum number (l), the magnetic quantum number (m), and the spin quantum number (s).

The principal quantum number (n) determines the energy level of an electron and can have integer values starting from 1. The azimuthal quantum number (l) determines the shape of the electron's orbital and can have values from 0 to (n-1). The magnetic quantum number (m) determines the orientation of the orbital and can range from -l to +l. The spin quantum number (s) describes the spin of the electron and can have two possible values, +1/2 or -1/2.

Since each electron in an atom must occupy a unique set of quantum numbers, they must differ in at least one of the four quantum numbers. This ensures that no two electrons have the exact same quantum state.

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Among the compounds listed, H₂SO₄ (sulfuric acid) is the strong electrolyte.

So, the correct answer is C.

A strong electrolyte is a compound that dissociates completely into ions when dissolved in water, resulting in high electrical conductivity.

When dissolved in water, it completely ionizes into H+ and SO₄²⁻ ions, allowing the solution to conduct electricity efficiently.

In contrast, H₂O (water) and O₂ (oxygen) are not electrolytes as they do not form ions.

C6H12O6 (glucose) is a nonelectrolyte since it dissolves in water without producing ions. C₃COOH (acetic acid) is a weak electrolyte because it partially dissociates into ions in aqueous solution.

Hence , the answer of the question is C.

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The symbol for the ion electronic structure 1s^2 2s^2 2p^6 3s^2 3p^6 3d^10 4s^2 4p^6 4d^10 5s^2 with an atomic number of 50 is Sn (Tin).

EXPLANATION: The symbol for the ion electronic structure with an atomic number of 50 and the following configuration 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰5s² is Sn. Therefore, the symbol for the ion electronic structure with an atomic number of 50 and the following configuration 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰5s² is Sn.What is electronic structure?An electronic structure describes how the electrons of an atom are distributed among the shells and sub-shells in the ground state. The electronic structure of atoms is divided into shells and sub-shells, where shells are the outermost part of an atom and sub-shells are the inner part of an atom.The electronic structure of atoms is vital in chemistry because it determines how atoms interact with each other, as well as how they form bonds to make molecules. Therefore, understanding electronic structures is essential in order to grasp and understand chemistry.

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The compounds that are not sp3d hybridized at the central atom are i. BF₃ and iii. SF₄.

In sp3d hybridization, the central atom adopts a trigonal bipyramidal geometry, with five electron domains (either bonding or lone pairs) arranged around it. However, both BF₃ and SF₄ do not have this arrangement.

i. BF₃: Boron (B) in BF₃ has only three electron domains, forming three sigma bonds with three fluorine (F) atoms. It does not have any lone pairs, so it does not require d orbitals for hybridization. Therefore, BF₃ is not sp3d hybridized.

iii. SF₄: Sulfur (S) in SF₄ has four electron domains, forming four sigma bonds with four fluorine (F) atoms. It also has one lone pair of electrons. With only four electron domains, SF₄ does not require d orbitals for hybridization. Therefore, SF₄ is not sp3d hybridized.

On the other hand, the compounds AsI₅, BrF₅, and XeF₄ have five electron domains around the central atom, requiring d orbitals for hybridization and exhibiting sp3d hybridization.

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Answer: Gas has loosely packed atoms, liquids have mediumly packed atoms, and solids have tightly packed atoms.

Explanation: Solids have tightly packed atoms which is what keeps them in their defined shape. They have a defined volume and a defined shape.

Liquids have mediumly packed atoms because liquids don't have a definite shape and take the shape of the container they are placed in. It has a definite volume, but an indefinite shape.

Gases have loosely packed atoms because gases can float around anywhere. They don't have a definite volume, and they don't have a definite shape.

Answer:

covalent bonds............

covalent bonds

Ionic bonds structure when a nonmetal and a steel alternate electrons, while covalent bonds form when electrons are shared between two nonmetals. An ionic bond is a type of chemical bond formed through an electrostatic enchantment between two oppositely charged ions.

The thermometer will read -10°C after about 2.43 minutes.

(a) After four more minutes, the thermometer will read -1°C.

This is because the temperature difference between the room and outdoors is (24 - (-11)) = 35°C.

The thermometer then rises 7°C in one minute, so the thermometer is heated at 7°C/minute, i.e. 35°C in five minutes.

So the temperature of the thermometer after 4 more minutes is 7°C + 7°C + 7°C + 7°C = 28°C, 28°C - 35°C = -7°C, -7°C - 3°C = -10°C.

Thus the reading on the thermometer will be -1°C after four more minutes.

(b) To find out when the thermometer will read -10°C, use the formula:

time = (temperature difference ÷ heating rate) + time to start

       = (-10°C - 7°C) ÷ 7°C/minute + 1 minute

       = -17°C ÷ 7°C/minute + 1 minute≈ -2.43 minutes

Thus, the thermometer will read -10°C after about 2.43 minutes.

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H2CO3 + NaOH --> Na2CO3 + H2O

Here salt is Na2CO3.

So, (A) H2O + Na2CO3 is your answer.

The lewis electron-dot diagram which represents the bonding in potassium iodide, KI is give in image attached.

The correct answer choice is option 1.

The lewis structure can simply be defined as those diagrammatic chemical representations which describes the bonding between atoms in a particular molecular structure of a chemical substance. From the context of the above given task, the structure is bonded by eight different electrons.

The importance of lewis electron-dot structures cannot be overemphasized. Some of its significances are as follows:

In conclusion, we can now confirm from the explanation given above that potassium iodide is solid chemical compound.

The complete image of the options of the question is also attached.

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Chemistry's understanding of stoichiometry is crucial since it provides information on the yield of the reaction that is occurring.

We'll see a precipitation reaction in this lab (double replacement). When two soluble salts are combined, a reaction occurs that causes one product to precipitate while the other stays in solution. We will begin with known concentrations of calcium chloride and sodium carbonate.

Chemical Reaction Type: We have a double replacement reaction for this reaction. Balanced Approaches: This reaction involves two replacements, or displacements.

By combining solutions of calcium chloride and sodium carbonate to create the precipitate calcium carbonate, it is possible to make a straightforward example of how a precipitate is proof that a chemical reaction has occurred (CaCO3).

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sorry the pic is blocked

Assuming ideal solution behavior, the molar mass of the compound in the solution is approximately 0.214 kg/mol, based on the boiling point elevation method.

To find the molar mass of the compound dissolved in carbon tetrachloride, we can use the concept of boiling point elevation. The equation used to calculate the boiling point elevation is:

ΔTb = Kb * m

where ΔTb is the boiling point elevation, Kb is the molal boiling point constant of the solvent, and m is the molality of the solute.

First, we need to calculate the molality of the solute in the solution:

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

Given that the mass of the compound is 5.00 g and the mass of carbon tetrachloride is 25.00 g, we need to convert the masses to kg:

mass of compound (in kg) = 5.00 g / 1000 = 0.005 kg

mass of carbon tetrachloride (in kg) = 25.00 g / 1000 = 0.025 kg

Next, we calculate the moles of solute:

moles of solute = mass of solute / molar mass of solute

Let's assume the molar mass of the compound is M.

moles of solute = 0.005 kg / M

Now, we can calculate the molality:

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

m = (0.005 kg / M) / 0.025 kg

m = 0.2 / M

Next, we calculate the boiling point elevation (ΔTb):

ΔTb = Kb * m

ΔTb = 5.02 °C/m * (0.2 / M)

ΔTb = 1.004 / M °C

Finally, we can calculate the change in boiling point (ΔTb) using the equation:

ΔTb = Tb - Tb°

where Tb is the boiling point of the solution (81.5 °C) and Tb° is the boiling point of the pure solvent (76.8 °C).

ΔTb = 81.5 °C - 76.8 °C

ΔTb = 4.7 °C

Now we can set up an equation to solve for the molar mass (M):

1.004 / M = 4.7 °C

Solving for M:

M = 1.004 / 4.7

M ≈ 0.214 mol/kg

Therefore, the molar mass of the compound in the solution is approximately 0.214 kg/mol.

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In Xenon difluoride, XeF2, the central Xe atom has a total of eight valence electrons, with four of them being from the Xe atom and four from the two F atoms.

To form a stable molecule, the central Xe atom forms bonds with the outer F atoms. In the case of XeF2, each F atom forms a single covalent bond with Xe.

The bond formed between Xe and F atoms is a sigma bond.  To understand which atomic or hybrid orbital on Xe atom makes up the sigma bond, we need to look at the electronic configuration of Xe.

The electronic configuration of Xe is [Kr] 4d^10 5s^2 5p^6. When it forms a bond with the F atom, one of the 5p orbitals hybridizes with one of the 5s orbitals to form sp^3 hybrid orbitals.

The hybridized orbitals form covalent bonds with the F atoms, and the unhybridized p-orbitals form the pi bonds.

Therefore, the sigma bond in XeF2 is formed by the overlap of sp^3 hybrid orbitals of Xe and the 2p orbitals of the F atoms. The hybridization of orbitals in Xe helps in the formation of stable bonds and ensures the proper arrangement of atoms around the central Xe atom.

Overall, the formation of sigma and pi bonds in XeF2 is crucial for its stability and reactivity.

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Answer:

D) red litmus turns blue​

Explanation:

Took this test, hope it helps! :)

Answer:

8.1×10^-8 mols-1

Explanation:

Now we have the mass of copper sulphate produced after three days. Recall that the rate of reaction is given as;

Rate= change in the concentration of product/time

At the beginning of the reaction, there was 0 moles of copper sulphate

After 72 hours or 259200 seconds, there was 3.4g/160gmol-1 = 0.021 moles of copper sulphate.

Note that 160gmol-1 is the molar mass of copper sulphate.

Hence;

Rate of reaction= 0.021 moles /259200 seconds

Hence, the rate of reaction is 8.1×10^-8 mols-1

Rate of reaction= 8.1×10^-8 mols-1