how many OWLS are 4 desks?

Answer:

Explanation:

The average speed of the car can be found by using the formula

\(s = \frac{d}{t} \\ \)

d is the distance

t is the time taken

From the question we have

\(s = \frac{378}{12} = \frac{63}{2} \\ \)

We have the final answer as

Hope this helps you

The pH of each of the following solutions of a strong acid in water for (a) 0.16 M HCl is 0.78, (b) 4.4 M HClO4 is 3.35, (c) 2.31011 M HI is 10.64.

A strong acid is an acid that is completely ionized in water. Therefore, the pH of a solution of a strong acid in water can be calculated using the following formula:

pH = -log[H+]

(a) 0.16 M HCl:

= [H+]

= 0.16 M

pH

= -log(0.16)

= -(-0.78)

= 0.78

(b) 4.4 M HClO4:

[H+]

= 4.4 M

pH

= -log(4.4)

= -(0.35)

= 3.35

(c) 2.3 x 10^-11 M HI:

[H+]

= 2.3 x 10^-11 M

pH

= -log(2.3 x 10^-11)

= -(-10.64)

= 10.64

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Answer:

you have to answer about what Emmy Noether was known for and how she accomplished her goal! For example Dr. Martin Luther King was known for his peaceful protests and his famous "I Have a Dream". He accomplished this goal by never giving up and sticking to his morals! I hope this helped!! ♡♡ (BTW love your profile picture)

The formula for the compound formed between magnesium and bromine is MgBr₂.

The formula of a compound is a representation of the elements present in the compound and the ratio in which they are combined. It indicates the types and the number of atoms of each element in a molecule or an empirical formula unit of the compound.

The formula for the compound formed between magnesium (Mg) and bromine (Br) using the Lewis model can be considered by looking at the valence electrons of each atom.

Magnesium (Mg) is located in Group 2 of the periodic table and has a valence electron configuration of [Ne] 3s². It tends to lose its two valence electrons to achieve a stable octet configuration.

Bromine (Br) is located in Group 17 of the periodic table and has a valence electron configuration of [Ar] 4s² 3d¹⁰ 4p⁵. It tends to gain one electron to achieve a stable octet configuration.

Since magnesium loses two electrons and bromine gains one electron, they can form an ionic bond. The Lewis structure for this compound can be represented as follows:

Mg²⁺ + Br⁻ → MgBr₂

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The more concentrated cell consisting of two Zn2+/Zn electrodes will be the anode.

If one were to construct an electrochemical cell consisting of two Zn2+/Zn electrodes at two different concentrations, the more concentrated cell will be the anode.
In an electrochemical cell with two Zn2+/Zn electrodes at different concentrations, the more concentrated cell will act as the anode. The reason for this is that the higher concentration of Zn2+ ions will cause the electrode to undergo oxidation more readily, releasing electrons and forming Zn2+ ions. The less concentrated cell will act as the cathode, where Zn2+ ions will gain electrons and reduce back to Zn. This process establishes a flow of electrons through the external circuit, generating an electric current.

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Answer:

The answer would be solid

Explanation:

The decomposition reaction of silver chloride (AgCl) when exposed to light can be represented by the following balanced equation:

2AgCl (s) → 2Ag (s) + Cl2 (g)

In this equation, solid silver chloride decomposes into silver metal (Ag) and gaseous chlorine (Cl2) when exposed to light.

This reaction is an example of a photochemical reaction, where light energy triggers a chemical change. In this case, the absorption of light energy causes the silver chloride crystal lattice to break down, resulting in the formation of silver atoms and chlorine molecules.

It's worth noting that silver chloride is a photosensitive compound commonly used in traditional black and white photography. When light strikes the silver chloride-coated film, it creates a pattern of exposed and unexposed areas. The exposed areas undergo the decomposition reaction, resulting in the formation of metallic silver, which forms the photographic image.

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Explanation:

REFER TO THE ATTACHMENT ABOVE.....

The step that should be taken to remove air bubbles from the buret tip Ensure that the buret is properly clamped or held securely in an upright position.

An air bubble is a small pocket or sphere of air trapped within a liquid or a solid substance. In the context of liquids, such as water or other fluids, air bubbles often form due to the presence of dissolved gases (like oxygen or carbon dioxide) or through mechanical means like agitation or turbulence. When a liquid is agitated or subjected to pressure changes, it can cause air to be trapped and form bubbles.

Air bubbles are also commonly found in various solid materials, such as glass, plastic, or certain foods like bread or cake. During the manufacturing or baking process, gases, particularly carbon dioxide, can be released and get trapped within the material, leading to the formation of bubbles.

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Sodium has more protons, neutrons, and electrons than Lithium.

The nuclei of atoms consist of protons and neutrons. Both component form the bulk of the mass of atoms.

Outside the nucleus, electrons are found in the orbitals surrounding the nucleus.

The atomic number of an atom is the number of protons in the nucleus of the atom. For neutral atoms, the number of protons and electrons is the same.

The atomic number of Lithium is 2, while that of Sodium is 11. This means Lithium has 2 protons while sodium has 11.

The atomic mass of Lithium is 7 while that of sodium is 23. This means that sodium has more neutrons than lithium.

Thus, sodium has more neutrons, electrons, and protons, than lithium.

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In order for a solid to become a liquid, conditions must either get hotter or less pressured. This is due to the physical process of melting, which is aided by the input of energy in the form of heat, which causes a solid to a liquid.

A phase transition from solid to liquid involves a change in the physical state of matter. This transition is a physical alteration that can be brought about by either raising the solid's temperature or lowering its pressure. An increase in temperature or a decrease in pressure weakens the intermolecular interactions that hold a solid together, enabling its molecules to defy gravity and begin moving more freely. Melting is the process by which a solid transforms into a liquid at a particular temperature known as the melting point that is particular to each substance.

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Answer:

I think its B but i may be wrong

Explanation:

Sorry if im wrong!! Took that test but i dont rm the answer well enough to be for sure

The reaction is non-spontaneous

this is the correct answer

the amount of heat required to evaporate 3.06 ml of ethyl chloride at 25°C is 1.30 kJ.

The first step in solving this problem is to calculate the amount of energy required to evaporate 3.06 ml of ethyl chloride. To do this, we need to know the heat of vaporization of ethyl chloride, which is 27.5 kJ/mol.
We can use the molar mass of ethyl chloride (64.5 g/mol) to convert 3.06 ml to moles, which is 0.0474 mol.
Next, we can use the heat of vaporization and the number of moles to calculate the energy required:
Energy = heat of vaporization x number of moles
Energy = 27.5 kJ/mol x 0.0474 mol
Energy = 1.30 kJ
Therefore, the amount of heat required to evaporate 3.06 ml of ethyl chloride at 25°C is 1.30 kJ.
Ethyl chloride (C2H5Cl) is a topical anesthetic, which can numb the skin when sprayed as a liquid. The energy absorbed during the evaporation process cools the skin, making it an effective anesthetic. To determine the heat (in kJ) required to evaporate 3.06 mL of ethyl chloride at 25°C, we need to consider the specific heat of vaporization, which is 26.4 kJ/mol for ethyl chloride.
First, convert 3.06 mL to moles by dividing the volume by the molar volume of ethyl chloride (62.5 g/mol and a density of 0.92 g/mL):
3.06 mL * 0.92 g/mL = 2.8152 g
2.8152 g / 62.5 g/mol = 0.04504 mol
Next, multiply the moles by the heat of vaporization:
0.04504 mol * 26.4 kJ/mol = 1.1891 kJ
So, 1.1891 kJ of heat is required to evaporate 3.06 mL of ethyl chloride at 25°C.

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The option e) loss of H+, addition of a nucleophile that reacts with the propagating site, and a chain transfer reaction with the solvent can result in chain termination in cationic polymerization.

The option that can result in chain termination in cationic polymerization is:

Loss of H+, addition of a nucleophile that reacts with the propagating site, and a chain transfer reaction with the solvent

Chain termination in cationic polymerization:

In cationic polymerization, chain termination occurs by different methods. Chain termination can occur due to loss of H+, addition of a nucleophile that reacts with the propagating site, and a chain transfer reaction with the solvent. In chain transfer reaction, a transfer agent combines with the free radical, resulting in the termination of the chain. Chain transfer reaction with the solvent usually occurs in the presence of an impurity, which can act as a transfer agent.

Thus, we can conclude that the option e) loss of H+, addition of a nucleophile that reacts with the propagating site, and a chain transfer reaction with the solvent can result in chain termination in cationic polymerization.

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Answer:

Use the chart below to help you. Follow the arrows

Explanation:

For instance, number 8 is where liquid is going to solid. The chart tells you that it's freezing.

Answer:

b

Explanation:

Answer:

When the Ruler is bent the energy stored in it will be potential energy, When the ruler will be released this potential energy will be then converted into the Kinetic energy as a result the ruler will move Vibrations.

The energy conservation law can be applied here

K1 + U1 = K2 + U2

K1 - initial kinetic energy

U1 - Initial potential energy

K2 - final kinetic energy

U2 - final potential energy

Energy is known commonly as the ability to do work or move a matter. The type of energy that is stored is called potential energy.

if the ruler is released at the bent end, the object or pebbles on it will fly. If you hold two positive charges near each other, they have potential energy because they will move if you release them.

If the object released is fired straight up into the air, it begins with a high kinetic energy. As it rises, it slows down due to the force of gravity pulling it toward the earth.

Due to the release, the object place on the ruler rises, its gravitational potential energy is therefore increasing and its kinetic energy is decreasing.

When the object reaches the top of its arc, it kinetic energy is zero and its potential energy is maximum.

Then gravity still to pull the object down the earth and the object will fall toward the earth and just as it falls down, its speed increases and its height decreases.

So, its kinetic energy will thus increases as it falls and its potential energy decreases.

When the object has returns to its original height, its kinetic energy will be the same as when it started upward.

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The hydroxide ion (−OH) is a strong base and can deprotonate compounds that have an acidic hydrogen atom.

When the −OH ion reacts with an acidic compound, it accepts a proton (H+) to form a water molecule, thereby neutralizing the acidic compound. The pKa value of water is 15.7, which means that compounds with a pKa value below 15.7 can be deprotonated by −OH.

Some examples of compounds that can be deprotonated by −OH include:

Carboxylic acids: These compounds have a carboxyl group (-COOH) that can be deprotonated by −OH to form a carboxylate ion (-COO−). Examples include acetic acid (pKa = 4.75) and benzoic acid (pKa = 4.2).

Phenols: These compounds have a hydroxyl group (-OH) attached to an aromatic ring that can be deprotonated by −OH to form a phenoxide ion (-O−). Examples include phenol (pKa = 9.95) and 4-nitrophenol (pKa = 7.15).

Amides: These compounds have a nitrogen atom attached to a carbonyl group (-CONH2) that can be deprotonated by −OH to form an amide anion (-CONH−). Examples include acetamide (pKa = 16.5) and formamide (pKa = 15.5).

Overall, any compound that has an acidic hydrogen atom with a pKa value below 15.7 can be deprotonated by −OH, resulting in the formation of a conjugate base and water.

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Answer:

It would take approximately 193.4 seconds for 326 mg of copper to be plated at a current of 5.1 A.

Explanation:

To calculate the time required for the plating of copper, we can use Faraday's law of electrolysis, which states that the amount of substance deposited or liberated at an electrode is directly proportional to the quantity of electricity passed through the electrolyte.

The equation for the electrodeposition of copper is:

Cu2+(aq) + 2e- -> Cu(s)

First, we need to determine the number of moles of copper being plated. We can use the molar mass of copper to convert the mass given into moles:

Mass of copper = 326 mg = 0.326 g

Molar mass of copper (Cu) = 63.55 g/mol

Number of moles of copper = (0.326 g) / (63.55 g/mol) = 0.00512 mol

Now, we can use Faraday's law to calculate the time required:

1 mol of Cu2+ requires 2 faradays (F) of charge for electrodeposition.

The Faraday constant (F) is equal to 96,485 coulombs/mol.

Charge (Q) = number of moles of copper (mol) × Faraday constant (F)

Charge (Q) = 0.00512 mol × 2 × 96,485 C/mol = 987.3 C

Current (I) = 5.1 A

Time (t) = Charge (Q) / Current (I) = 987.3 C / 5.1 A ≈ 193.4 seconds

Therefore, it would take approximately 193.4 seconds for 326 mg of copper to be plated at a current of 5.1 A.

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Answer:

Elements:lead

Explanation:

Lead is a metal element. because it is made of only metal atoms,it does not dissolve in water,but it does conduct electricity.

I hope it's helpful!

Water is a polar substance. Polar solvents dissolve polar substances. Now, the bond between carbon and hydrogen is a covalent bond, because the electronegativity difference between these two elements is less than 1.7.

Therefore, the low solubility of hexane is due to the fact that hexane is nonpolar with covalent bonds.

Answer: C) Nonpolar covalent

The number of mole of water, H₂O present, given that 2.43 g of H₂O was vaporized is 0.13 mole

From the above question, the following parameters were obtained:

Mole and mass of a substance are related by the following formula:

Mole = mass / molar mass

Inputting the given parameters, we can obtain the mole of water, H₂O as follow:

Mole of water, H₂O = 2.43/ 18.02

Mole of water, H₂O = 0.13 mole

Thus, we can say that the mole of water, H₂O present is 0.13 mole

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In this compound, the proportion of carbon atoms to oxygen atoms is 12: 11.

What distinguishes an atom of carbon as such?

The nucleus of a carbon atom is made up of six protons and six neutrons, and it is encased in six electrons. According to quantum physics, the first two electrons must occupy the innermost atomic orbital, while the wavefunctions of the following four electrons only partially fill the second standard and three second principal orbitals.

How are atoms located in a compound?

Calculate the element's molar mass using the periodic table. To determine the atoms, the number of moles, divide the given mass in grams by the molar mass. To get the number of atoms, multiply the number of moles by Avogadro's number.

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Genetic diversity is produced by sexual reproduction, which gives a population a variety of appearances. The following paragraph contains the necessary information regarding genetic diversity.

It is possible for organisms to adapt to changing environmental conditions and prevent inbreeding by maintaining significant genetic variety. When there are limited, isolated populations, inbreeding takes place, which might make a species less able to endure and procreate.

Genetic diversity is the range of different hereditary traits within a species. There would be several people with a wide range of diverse traits in such a species with significant genetic diversity. For a community to adapt to shifting surroundings, genetic variety is essential.

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Answer:

Around 129 galons

Explanation:

if you divied 3,241 by 4 you get 129 gallons but if you times that by 25 you get 3,225 so a little bit off but close.

The freezing point depression of a solution is proportional to the molality (m) of the solution, where molality is defined as the number of moles of solute per kilogram of solvent.

The more solute dissolved in a solution, the lower its freezing point will be. Based on this information, we can match the aqueous solutions with their appropriate letter from the column on the right:

0.10 m CuCl2 → C. Third lowest freezing point

0.13 m Cr(CH3COO)2 → B. Second lowest freezing point

0.17 m CuSO4 → A. Lowest freezing point

0.37 m Glucose (nonelectrolyte) → D. Highest freezing point

Explanation:

CuCl2 and CuSO4 are both strong electrolytes that dissociate completely in solution to form two ions per formula unit.

Therefore, they will have a greater effect on the freezing point depression compared to Cr(CH3COO)2, which only dissociates partially in solution.

Glucose is a nonelectrolyte and does not dissociate in solution, so it will have no effect on the freezing point depression. Therefore, it will have the highest freezing point among the given solutions.

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(a) Using the ideal gas law, the pressure in the flask is approximately 11.43 atm.

(b) Using the van der Waals equation, the pressure in the flask is approximately 9.44 atm.

(c) There is a difference between the pressures because the van der Waals equation accounts for the volume of the molecules and the attractive and repulsive forces between them.

(d) The correction for the volume of the molecules is more significant than the correction for the attractive forces between molecules because the volume correction is proportional to the amount of gas. Since the amount of gas is relatively small compared to the square of the amount of gas, the correction for the volume of the molecules is more significant.

a) The ideal gas law is PV = nRT. Here, P is the pressure, V is the volume, n is the number of moles of gas, R is the gas constant, and T is the temperature.

Using the ideal gas law:

PV = nRTP = (nRT)/V

Where,

P = Pressure of CO₂

n = Number of moles of CO₂

V = Volume of CO₂

T = Temperature of CO₂

R = Gas constant = 0.08206 L-atm/mol-K (This value can be converted to other units based on the unit of pressure, volume, and temperature used in the problem)

Substitute the values into the formula:

P = (0.467 mol * 0.08206 L-atm/mol-K * (159°C + 273.15)) / 0.245 L

P = 11.43 atm (approximately)

b) The van der Waals equation is given as (P + an²/V²)(V - nb) = nRT, where a and b are constants based on the properties of the gas being used. Since CO₂ is a gas composed of polar molecules, the van der Waals constant, "a," is nonzero, while the van der Waals constant, "b," accounts for the size of the gas molecules and is also nonzero for CO₂.

Using the van der Waals equation:

(P + an²/V²)(V - nb) = nRT

Solve for P. The value of a and b are 3.59 L²-atm/mol² and 0.0427 L/mol, respectively. Plug in the given values:

P = (nRT/(V - nb)) - (an²/V²)(a)

P = ((0.467 mol * 0.08206 L-atm/mol-K * (159°C + 273.15 K))/(0.245 L - (0.0427 L/mol * 0.467 mol))) - ((3.59 L²-atm/mol² * 0.467 mol²)/(0.245 L)²)(b)

P = 9.44 atm (approximately)

c) The van der Waals equation is an improvement over the ideal gas law because it accounts for the volume of the molecules and the attractive and repulsive forces between them that become significant at high pressures and low temperatures. At low pressures and high temperatures, the ideal gas law works well since the forces between molecules are negligible and the volume of the molecules is relatively small. However, at high pressures and low temperatures, the volume of the molecules and the attractive forces between them become significant, resulting in the deviation of gases from ideal behavior.

d) In this case, the correction for the volume of the molecules (represented by "b") is more significant than the correction for the attractive forces between molecules (represented by "a"). This is because the volume correction is proportional to the amount of gas, while the correction for the attractive forces is proportional to the square of the amount of gas. Since the amount of gas is relatively small compared to the square of the amount of gas, the correction for the volume of the molecules is more significant.

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At constant temperature, if the volume of the gas is doubled, the pressure also doubles. The new pressure of the gas is 50°C.

Charles's law states that "the volume occupied by a definite quantity of gas is directly proportional to its absolute temperature.

It is expressed as;

V₁/T₁ = V₂/T₂

Given that;

If final volume is double of initial volume.

V₁/T₁ = V₂/T₂

V₁T₂ = V₂T₁

T₂ = V₂T₁ / V₁

T₂ = ( 1000cm³ × 25°C ) / 500cm³

T₂ = 25000m³°C / 500cm³

T₂ = 50°C

At constant temperature, if the volume of the gas is doubled, the pressure also doubles. The new pressure of the gas is 50°C.

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If the hydrogen gas is combusted and produces 645L of water vapor at 400 kelvin and 1.75 atm, 2796.96 g mass of the zinc is produced .

Using the ideal gas law equation:

PV = nRT

n = (PV) / (RT)

= (1.75 atm * 645 L) / (0.0821 atm·L/(mol·K) * 400 K)

= 42.71 moles

the balanced equation for the reaction between zinc and hydrochloric acid:

Zn + 2HCl -> \(ZnCl_{2}\)  + \(H_{2}\)

1 mole of zinc produces 1 mole of hydrogen gas. Therefore, the moles of zinc are also 42.71.

The molar mass of zinc is 65.38 g/mol.

Mass of zinc = moles of zinc * molar mass of zinc

= 42.71 moles * 65.38 g/mol

= 2796.96 g

Therefore, the mass of the zinc is 2796.96 grams.

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