are radicals charged or neutral​

The mass of unknown radioactive substance will be 69 gram.

When a substance will have unstable nuclei and even the capacity to spontaneously release energy while exchanging fast-moving charged particles in an effort to stabilize, the substance is described as radioactive.

It is known that

\(N/N_{0} = (1/2)^{t/x}\)

where, N = initial quantity, \(N_{0}\)  = quantity remaining, t = elapsed time.

Given that,

N = 38.5 g

t = 3.20 hours

x = 8 hour

\(N_{0}\) = ?

Put the value of given data in above equation.

\(N/N_{0} = (1/2)^{t/x}\)

38.5/ \(N_{0}\)  = 80/32

\(N_{0}\)  = 69 gram.

Therefore, the mass of unknown radioactive substance will be 69 gram.

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The brush used for artificial nail services is made the of a. nylon

This type of hair is preferred because it is easy to clean and durable. Nylon hair also has the ability to hold onto liquid products, such as acrylic or gel, without soaking them up too quickly, allowing the nail technician to have more control over the application process. While natural hair brushes may be used for some services, such as gel polish application, they are not ideal for use with acrylics or other liquid nail products as they can absorb too much of the product and become damaged over time.

Plastic brushes are not typically used in artificial nail services, as they are not as effective at holding and applying the products. Overall, a nylon hair brush is the preferred choice for artificial nail services due to its durability, ease of cleaning, and ability to hold liquid products.

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Answer:

Kristy thank you doing today hope you doing recently

Radio waves, ultraviolet rays, X-rays, and gamma rays are all examples of electromagnetic radiation, as are microwaves.

There are several uses for microwaves, including for communications, radar, and—possibly for the most part—cooking. Waves or particles of electromagnetic radiation with various wavelengths and frequencies are communicated.

The electromagnetic spectrum (EM spectrum) is the name given to this wide spread of frequencies. In general, the spectrum is divided into seven areas in ascending sequence of increasing energy and frequency and decreasing wavelength.

Radio waves, microwaves, infrared (IR), visible light, ultraviolet (UV), X-rays, and gamma-rays are some of the common names for these types of energy. In the electromagnetic (EM) spectrum, microwaves are found between radio and infrared light.

Therefore, Radio waves, ultraviolet rays, X-rays, and gamma rays are all examples of electromagnetic radiation, as are microwaves.

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Answer:

C.

Explanation:

\(\frac{1x10}x^{-14} = 1x10^{-9} \\ x =1x10^{-5} \\\\[OH][H]= 1x10^{-14}\)

The concetration can be found by dividing the water ph constant by the [H=] or [OH] to find the other

If a given aqueous solution at 298 K contains [H+] = 1.0 × 10-9, 1.0 × 10⁻⁵ is the  [OH⁻] . Therefore, the correct option is option C.

Hydrogen oxide is a diatomic anion with both the chemical symbol OH. Hydroxide proton, hydroxide radical, as well as hydrogen dioxide are all names for hydrogen dioxide. It is composed of two hydrogen as well as two oxygen atoms connected by a covalent bond.

It has a wide range of applications, including food preservation, buffer, anticoagulant preserving preserved blood, as well as urine alkalinization to avoid kidney stones. It also serves as a base, nucleophile, ligand, and catalyst. The ion is a minor component of water and produces salts, a number of which dissolve in water to produce solvated hydroxide ions.

[H⁺] [OH⁻] = 10⁻¹⁴

1.0 × 10⁻⁹ × [OH⁻] = 10⁻¹⁴

[OH⁻] =  10⁻¹⁴/  10⁻⁹ = 1.0 ×10⁻⁵

Therefore, the correct option is option C.

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When an atom of the element lithium (Li) transfers an electron to an atom of the element fluorine (F), then the bond results between the atoms is ionic bond.

A chemical bond is defined as the bond which holds atoms together in molecules.

Bonds arise due to the electrostatic forces present between positively charged atomic nuclei and negatively charged electrons.

Ionic bond is defined as the transfer of electron from one atom to another atom.

Since, electron transfer from lithium to fluroine. Thus lithium get positive charge and fluorine occupy negative charge.

Thus, the bond form between lithium atom and fluorine atom is ionic bond.

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Answer:

......

Explanation:

To maintain the original pressure of 220 kPa when the tire reaches a temperature of 38°C, approximately 36.4% of the original air must be removed.

If the tire is filled with air at 15°C to a gauge pressure of 220 kPa, the absolute pressure will be 220 kPa + 101.325 kPa = 321.325 kPa.

Using the absolute temperature, the ratio of the volume of the gas after heating to the volume of the gas before heating can be determined from Charles's law.

V₁ / T₁ = V₂ / T₂

From Charles's law,

P₁ / T₁ = P₂ / T₂

We have:

P₁ = 321.325 kPa

T₁ = 15 + 273.15 = 288.15 K

P₂ = 220 kPa

T₂ = 38 + 273.15 = 311.15 K

Therefore,

P₂ = (P₁ × T₂) / T₁ = (321.325 kPa × 311.15 K) / 288.15 K = 346.966 kPa

To determine the fraction of the original air that must be removed if the original pressure of 220 kPa is to be maintained:

Fraction of air that must be removed = (P₂ - Pₒ) / P₂ = (346.966 kPa - 220 kPa) / 346.966 kPa = 0.364 or 36.4%.

Therefore, the fraction of the original air that must be removed if the original pressure of 220 kPa is to be maintained is 0.364 or 36.4%.

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Answer:

315 miles in 7 hours.

Explanation:

If they are going 45 per hour. Then its times 7.
So its  45
          x 7
        --------
          315

Answer:

315 miles in 7 hours.

Explanation:

The camel consumed approximately 2.24 kg of protein from the Bermudagrass hay.

To calculate the amount of protein the camel consumed, we need to consider the dry matter basis of the hay. Here's how you can calculate it:

Calculate the dry matter weight of the hay:

Dry Matter Weight = Total Weight of Hay × Dry Matter Percentage

Dry Matter Weight = 18.3 kg × (83.4/100)

Dry Matter Weight = 18.3 kg × 0.834

Dry Matter Weight = 15.2442 kg

Calculate the protein content in the dry matter;

Protein Content = Dry Matter Weight × Protein Percentage

Protein Content = 15.2442 kg × (14.7/100)

Protein Content = 15.2442 kg × 0.147

Protein Content = 2.2414194 kg

Therefore, the camel consumed approximately 2.24 kg of protein from the Bermudagrass hay.

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Phenolphthalein is a commonly used indicator in acid-base titrations because it changes color at a pH around 8.2-10.0.

Phenolphthalein itself is a weak acid and has a specific equilibrium between its acidic and basic forms. When added to an acidic solution, it is predominantly in the acidic form and colorless. As the titration progresses and the solution becomes more basic, the equilibrium shifts towards the basic form which is pink.

The amount of indicator used in the titration should be kept to a minimum to avoid affecting the accuracy of the results. Using too much indicator can affect the stoichiometry of the reaction, leading to inaccurate results.

Therefore, only a small amount of phenolphthalein, typically two drops, is used to minimize its impact on the titration while still providing a clear visual indication of the endpoint.

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If decomposition stopped completely, it would have a significant impact on atmospheric \(CO_{2}\) concentrations. Decomposition plays a crucial role in the carbon cycle by breaking down organic matter and releasing \(CO_{2}\) back into the atmosphere. Here's what would happen if decomposition ceased:

Reduced \(CO_{2}\) Release: Decomposition is responsible for releasing \(CO_{2}\) into the atmosphere as a byproduct of organic matter breakdown. Without decomposition, the natural recycling of carbon would be disrupted, leading to a significant reduction in \(CO_{2}\) release.

Decreased Carbon Sink: Decomposition contributes to the cycling of carbon between the atmosphere, plants, and soil. When organic matter decomposes, some of the carbon is stored in the soil as humus or becomes incorporated into new plant growth. With halted decomposition, this carbon storage and uptake would be greatly reduced, resulting in decreased carbon sequestration from the atmosphere.

Accumulation of Organic Matter: Without decomposition, dead organic matter would accumulate instead of being broken down. This accumulation could result in carbon-rich materials such as leaf litter, dead plant material, and organic waste not being fully processed, leading to a buildup of organic carbon over time.

Imbalance in the Carbon Cycle: Decomposition plays a vital role in maintaining a balance in the carbon cycle, where carbon is continuously exchanged between living organisms, the atmosphere, oceans, and the Earth's crust. If decomposition stopped, this balance would be disrupted, potentially leading to an imbalance in the carbon cycle and affecting other interconnected processes.

While the exact impact on atmospheric \(CO_{2}\) concentrations would depend on various factors and the timescale considered, the cessation of decomposition would likely result in a decrease in \(CO_{2}\) released into the atmosphere and a reduced capacity for carbon storage. However, it's important to note that decomposition is just one component of the carbon cycle, and there are other processes and factors influencing atmospheric \(CO_{2}\) concentrations, such as photosynthesis, respiration, and human activities.

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On an atomic level when a reaction takes place between two elements such as sodium and chlorine result in

two oppositely charged ions is they combine to form an ionic compound, sodium loses its one electron to

chlorine so chlorine gains one electron.

It forms a chloride ion and forms the ionic compound sodium chloride.

The change in enthalpy (ΔH) for the reaction N2 + 3H2 → 2NH3 is 1844 kJ/mol.

To calculate the change in enthalpy (ΔH) for the given reaction, we need to determine the total energy change associated with breaking the bonds in the reactants (N2 and 3H2) and forming the bonds in the product (2NH3).

Reactants:

N≡N (nitrogen gas): 1 bond at 942 kJ/mol

H–H (hydrogen gas): 3 bonds at 432 kJ/mol each

Products:

N–H (ammonia): 6 bonds at 386 kJ/mol each

Now, let's calculate the energy change for the bonds broken and formed:

Energy change for bonds broken in the reactants:

2 N≡N bonds = 2 × 942 kJ/mol = 1884 kJ/mol

6 H–H bonds = 6 × 432 kJ/mol = 2592 kJ/mol

Energy change for bonds formed in the product:

6 N–H bonds = 6 × 386 kJ/mol = 2316 kJ/mol

Now, we can calculate the overall energy change:

ΔH = (Energy of bonds broken) - (Energy of bonds formed)

= (1884 kJ/mol + 2592 kJ/mol) - (2316 kJ/mol)

= 4160 kJ/mol - 2316 kJ/mol

= 1844 kJ/mol

Therefore, the change in enthalpy (ΔH) for the reaction N2 + 3H2 → 2NH3 is 1844 kJ/mol.

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Explanation:

Steelmaking is the process of producing steel from iron ore and/or scrap. In steelmaking, impurities such as nitrogen, silicon, phosphorus, sulfur and excess carbon (most important impurity) are removed from the sourced iron, and alloying elements such as manganese, nickel, chromium, carbon and vanadium are added to produce different grades of steel.

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We are told that starch consists of glucose polymer, so we can assume that the caloric value of starch will be equal to the caloric value of glucose, that is, 3.9kcal/g.

Now to determine the kcal and kJ there were in the potato we must calculate the mass of starch present in that potato. We are told that it is 92% starch, therefore the mass of starch in the potato will be:

We have that in the potato there are 160.08 grams of starch. By multiplying it by the caloric value we will have the kcal that were in the potato, assuming that the rest of the ingredients do not contribute caloric value, or it is insignificant.

To calculate the kJ we must make the conversion using the relationship that 1 cal is equal to 4.184 joules:

In the potato, there were 624 kcal of energy or 2612kJ of energy.

The partial pressure of helium gas is 536 torr.

Assuming that the volume of the container remains constant and that the temperature is held constant at 20.0°C, the partial pressure of the helium gas can be calculated using the ideal gas law:

PV = nRT

where P is the total pressure of the gas mixture, V is the volume of the container, n is the number of moles of gas in the container, R is the gas constant, and T is the temperature in kelvins.

To find the partial pressure of helium gas, we need to know the total number of moles of gas in the container and the number of moles of helium gas. Since the volume and temperature are constant, the total number of moles of gas in the container remains the same. Therefore, we can use the following equation to relate the initial and final pressures of the gas mixture:

P₁V = nRT₁

where P₁ is the initial pressure of the gas mixture and T₁ is the initial temperature.

Solving for n, we get:

n = (P₁V)/(RT₁)

At 20.0°C, the value of the gas constant R is 0.08206 L·atm/(mol·K).

Using the given values, we get:

n = (760 torr)(10.0 L)/(0.08206 L·atm/mol·K)(293 K) = 31.5 mol

This is the total number of moles of gas in the container.

To find the number of moles of helium gas, we can use the fact that the initial pressure of the container is due to only nitrogen gas, and that the helium gas is added later. Therefore, the number of moles of helium gas can be calculated by subtracting the number of moles of nitrogen gas from the total number of moles of gas in the container:

n(He) = n(total) - n(N₂) = 31.5 mol - 10.5 mol = 21.0 mol

where n(N₂) is the number of moles of nitrogen gas in the container.

Now, we can use the ideal gas law to calculate the partial pressure of helium gas at a total pressure of 800 torr:

P(He) = (n(He)/n(total)) × P(total)

where P(total) is the total pressure of the gas mixture, and n(total) is the total number of moles of gas in the container.

Substituting the given values, we get:

P(He) = (21.0 mol/31.5 mol) × 800 torr = 536 torr

Therefore, the partial pressure of helium gas is 536 torr.

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The molecular formula of the compound is C12H14N₃O5.

To determine the molecular formula of the compound, we need to calculate the empirical formula first, which represents the simplest whole-number ratio of atoms in the compound.

Given the masses of carbon, hydrogen, nitrogen, and oxygen in the sample, we can calculate the moles of each element using their molar masses:

Moles of C = 0.900 g / 12.01 g/mol = 0.0749 mol

Moles of H = 0.0751 g / 1.008 g/mol = 0.0745 mol

Moles of N = 0.175 g / 14.01 g/mol = 0.0125 mol

Moles of O = 0.600 g / 16.00 g/mol = 0.0375 mol

Next, we need to find the simplest ratio of the moles by dividing each value by the smallest value:

Moles of C / 0.0125 = 5.992

Moles of H / 0.0125 = 5.960

Moles of N / 0.0125 = 1.000

Moles of O / 0.0125 = 3.000

Rounding these ratios to the nearest whole number, we get a ratio of 6:6:1:3, which corresponds to the empirical formula C6H6N1O3.

Finally, to determine the molecular formula, we divide the given molar mass of the compound (560 g) by the molar mass of the empirical formula (C6H6N1O3):

560 g / (6 * 12.01 g/mol + 6 * 1.008 g/mol + 1 * 14.01 g/mol + 3 * 16.00 g/mol) ≈ 560 g / 194.19 g/mol ≈ 2.88

Since the result is close to 3, we can multiply the empirical formula by 3 to obtain the molecular formula: C6H6N1O3 * 3 = C18H18N3O9.

However, none of the options provided match the calculated molecular formula.

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 The molecular formula for the molar mass of the unknown compound is 560g that consists of 0.900 g of carbon, 0.0751 g of hydrogen, 0.175 g of nitrogen, and 0.600 g of oxygen is C₂₄H₂₄N₄O₁₂ (Option A).

To determine the empirical formula, which involves converting the sample into moles. The moles of each element in the compound are calculated using their respective atomic masses.

The smallest number of moles is 0.0125 moles of nitrogen, which is the limiting reagent. As a result, the empirical formula is:

Therefore, the empirical formula is C₆H₆NO₃.

The empirical formula mass can be calculated by adding the molar masses of each element:

Total mass = 140.13

The molecular formula can be determined by comparing the empirical formula mass and the given molar mass. The molecular formula is the same as the empirical formula when the two values are equal. The ratio of the molecular formula mass to the empirical formula mass is equal to the integer value of n (number of empirical formula units):

n = molar mass/empirical formula mass

n = 560/140.13

n = 4

Therefore, the molecular formula is four times the empirical formula: C₂₄H₂₄N₄O₁₂ (Option A).

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Answer:

drowsiness

Explanation:

Answer:

6,570,000

Rounded to 3 significant figures. The figures therefore are 6, 5, 7

Answer:

The electromagnetic force is an important force in the chemical and biological sciences, as it is responsible for molecular connections like ionic bonding and hydrogen bonding.

In order to maintain the accuracy of results , the tool which  is most useful for measuring 12 milliliters of saltwater is graduated pipette.

Accuracy in terms of chemistry can be defined as to how close a measurement is to the true value.There are three types of accuracy:

1) Point accuracy-It means accuracy is present at that point of scale only.It does not give any information about the accuracy of the instrument.

2)Percentage of true value--It is the accuracy  which is determined by identifying accuracy of the instrument  and comparing it with the measured true value.

3)Percentage of scale range- It is the accuracy  which determines accuracy of the measurement.

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Answer:

The stoichiometric coefficient for aluminum, Al when the chemical equation is balanced is 2.

To obtain the stoichiometric coefficient for aluminum, we shall write and balance the equation for the reaction. This is illustrated below:

Aluminum => Al

Iron (II) chloride => FeCl₂

Aluminum chloride => AlCl₃

Iron => Fe

Aluminum + Iron (II) chloride —> Aluminum chloride + Iron

Al + FeCl₂ –> AlCl₃ + Fe

There are 3 atoms of Cl on the right side and 2 atoms on the left side. It can be balance by writing 3 before FeCl₂ and 2 before AlCl₃ as shown below:

Al + 3FeCl₂ –> 2AlCl₃ + Fe

There are 2 atoms of Al on the right side and 1 atom on the left. It can be balance by writing 2 before Al as shown below:

2Al + 3FeCl₂ –> 2AlCl₃ + Fe

There are 3 atoms of Fe on the left side and 1 atom on the right side. It can be balance by writing 3 before Fe as shown below:

2Al + 3FeCl₂ –> 2AlCl₃ + 3Fe

Now, the equation is balanced.

The coefficient of Aluminum, Al in the balanced equation is 2.

It moves to a lower energy level.

When electrons in an atom move from a lower energy level to a higher energy level. Then these higher energy electrons release their "extra" energy in the form of a photon which is a form of light and move back down to their original energy level. while on the other hand, when energy electrons absorb energy in the form of a photon they move to a higher energy level from their original energy level.

We can say that electron in an excited state release energy and comes to a lower state. Then the electron releases a photon. The energy present in that photon is related to the difference between the two levels or states in which the electron moves.

So we can conclude that an electron emits energy, it moves to a higher energy level.

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We will need to know Avogadro's number and the molar mass of sucrose for this problem to do dimensional analysis.

250g × \(\frac{1 mol}{342.297g}\) × \(\frac{6.022 * 10^{23} molecules}{1 mol}\) = 4.398 molecules

There are 4.398 sucrose molecules in 250 grams of sucrose.

Answer:

yea that's true

things you can do is: reduce ,reuse, and recycle

reduce the use of air/heat

remove lightbulbs and replace led bulb

drive less

plant a tree

Explanation:

Answer:

D and A

Explanation:

While protons or electrons can be influenced by other charged particles, neutrons are not.

and

Neutrons are held tightly together with protons in the nucleus, so scientists could not observe the behavior of neutrons independently.

Answer:

uuuh 4.25191 × 10-21 grams????

Explanation:

Answer:

It's A because its almost like a personality its just a sexuallity / gender

Answer:

half of its genetic material from each parent.

Explanation: