Atoms of what class of elements are used to absorb electrons in electron-dense stains?

Answer:

Please see attachment

Explanation:

You can draw something like the attachment. The nucleus is in the middle with both proton and neutron. The electron circles around the nucleus

Answer:

2 waves

Explanation:

If Frank creates 20 waves every second then the way you solve is turn it into a proportion 20 waves/10 secs = x/1 sec which then turns into the equation of 10x=20 where x=2 hence Franks creates 2 waves every second.

The grams of ammonium sulfate that are needed to make 1.5 l of an 8 m solution is 1585.2 grams.

Generally molarity is defined as number of the moles of a solute per liters of a solution. Molarity is also commonly known as the molar concentration of a solution.

Basically molarity is mathematically defined as Molarity = Number of moles of solute per Volume of solution in litre. Basically as the number of moles of solute is measured in mol and the volume of solution will be in litre . Therefore, the unit of molarity is mol L⁻¹ .

molarity = weight/(molecular weight * V(lit))

8M = WEIGHT/(132.1g/mole*1.5)

weight in grams = 1585.2 grams is needed

1585.2 grams ammonium sulfate is needed

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Based on the calculations performed in this experiment, the same mass of a solute with a significantly higher molar mass would have a larger effect on the boiling point elevation. As a result, the same mass of a solute with a higher molar mass will have a greater effect on the boiling point elevation.

Boiling point elevation is a thermodynamic phenomenon that occurs when the boiling point of a solvent (a substance that dissolves a solute to create a solution) is increased by adding another substance, the solute, to it. When a solute is added to a solvent, it lowers the freezing point and raises the boiling point of the solvent, which is known as the boiling point elevation.The formula for boiling point elevation is: ∆Tb = Kbm

Here, ∆Tb is the boiling point elevation, Kb is the molal boiling point elevation constant, and m is the molality of the solution. To understand this, let us take an example: Suppose a solution containing 1.0 mol of sodium chloride (NaCl) is dissolved in 1.0 kg of water. The molality of the solution is 1.0 mol / 1.0 kg = 1.0 m. In addition, the Kb for water is 0.51 °C/molal, which means that the boiling point elevation is 0.51 °C when the molality of the solution is 1.0 mol/kg.So, the boiling point of the solution will be raised by 0.51 °C, which can be calculated using the above formula.Calculation performed in this experiment:Boiling point elevation = ΔTb = Kb . mTherefore, based on the above formula, the boiling point elevation is directly proportional to the molality of the solution, which, in turn, is directly proportional to the number of moles of solute in the solution. Furthermore, the number of moles of solute is proportional to the mass of the solute (in grams) divided by its molar mass (in grams/mol).So, if a solute with a significantly higher molar mass is added to the solvent, it will have a larger effect on the boiling point elevation. As a result, the same mass of a solute with a higher molar mass will have a greater effect on the boiling point elevation.

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Intermolecular forces such as dipole-dipole forces, London dispersion forces exist between molecules and these depend on strength of electronegativity of molecule. Thus, the correct option is option C.

Intermolecular forces of attraction is force of attraction that make two molecule come closer. Intermolecular forces of attraction is directly proportional to the electronegativity of the molecule.

Size of electronegative molecule is small so, if any other molecule or molecule come into contact with this molecule then this molecule attract the electron of other molecule very efficiently and therefore the force between the molecule increases. Ethyl alcohol CH₃CH₂OH are held together by strong hydrogen bonding.

Thus, the correct option is option C.

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The amount of heat that is needed to change 250.0 grams of water at 80°C to steam at 100°C is 20900 J of heat.

Heat change is the amount of heat that must be added or that is evolved when a particular change occurs in a substance.

The amount of heat required is determined from the formula of heat given below as follows:

Heat change = mass * specific heat capacity * temperature change

Heat required = 250 * 4.18 * (100 - 80)

Hee=at required = 20900 J

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Both sand and potting soil are mixtures because they both contains more than one type of substances. Both are composed of minerals and different substrates.

Mixtures are substance formed by the combination of two or more components. The mixtures can be homogenous or heterogenous. Homogenous mixtures contains only one phase.

Heterogenous mixtures are of components with different phases. Sand is an example of heterogenous mixture. The major component of sand is silicon dioxide. it also contains grains of other minerals.

Potting soil is a mix of soil and minerals used for plantation. It also known as potting compost since it contains wood products, vermiculates, clay etc. Therefore, potting soil is a mixture.

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Entropy can be thought of as the amount of disorder in a system.

Entropy is a physical concept of order and disorder in a system, and it can be thought of as the measure of the amount of disorder in a system. In thermodynamics, entropy is a measure of the number of ways a system can rearrange its components and still be in the same state.

                                 The units of entropy are Joules per Kelvin (J/K), and the symbol used for entropy is S. The more ways there are for the molecules in a system to be arranged, the higher the entropy of that system. The entropy of a perfect crystal at absolute zero temperature is zero.

                                   As the temperature of a crystal increases, the entropy of the crystal increases as well. When the crystal melts, the entropy of the liquid is even greater because there are more ways for the molecules to move about.However, in a closed system, entropy will always increase over time. That's because over time, there are more ways for the molecules in the system to arrange themselves, and therefore, the entropy of the system increases.

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The resulting pH after adding the HNO\(_{3}\) solution is around the same as the pKa of HF, which is 3.17. Option D is the answer.

To determine the resulting pH after adding 15 mL of a 0.1 M HNO\(_{3}\) solution to 200.0 mL of a buffer made of 0.25 M HF and 0.25 M NaF, we need to consider the buffer's capacity to resist changes in pH.

The buffer consists of a weak acid (HF) and its conjugate base (F-). When an acid (HNO\(_{3}\)) is added, it reacts with the base (F-) in the buffer to form the conjugate acid (HF) and the nitrate ion (NO\(_{3}\)-).

Since the initial concentrations of HF and F- are equal (0.25 M), the buffer is at its optimal pH, which is approximately equal to the pKa of HF (3.17).

Adding the HNO\(_{3}\) solution increases the concentration of the conjugate acid (HF) and decreases the concentration of the base (F-). However, since the concentrations of HF and F- are still equal, the pH remains close to the pKa.

Therefore, the resulting pH after adding the HNO\(_{3}\) solution is approximately equal to the pKa of HF, which is 3.17.

Option D, 3.17, is the answer.

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The molar mass of the compound is 128.4 g/mol.

The empirical formula is an empirical formula that represents the lowest whole-number ratio of the atoms present in a compound. The empirical formula for the molecular compound is calculated using the percentage composition of the elements present in the compound. The steps used to find the empirical formula are as follows:

Find the mass of each element present in the compound.Convert each mass to moles.Divide each mole value by the smallest number of moles.Round to the nearest whole number and write the subscripts.The molar mass is the mass of a substance that contains 6.02 × 10²³ atoms or molecules. To calculate the molar mass of a compound, add the masses of all the atoms present in the compound.

C=0.707g,12.01 g/mol=0.0588 molCnH=0.2372 =1.01g/m=0.235 mol H

nH=4nC

The empirical formula of the compound is CH4. The molar mass of the compound can be calculated using the empirical formula.

M=12.01 g/mol+4(1.01 g/mol)=16.05 g/mol

The molar mass of the compound is 8 times the empirical mass, so the actual molar mass is;

M=8(16.05{g/mol})=128.4g/mol. The molar mass of the compound is 128.4 g/mol.

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Answer:

answer:

see the photo below

There are two types of mixture, one is homogeneous mixture and other is heterogeneous mixture. Therefore, in the below given ways we can differentiate between homogeneous and heterogeneous mixture.

When two or more compounds are combined but each ingredient retains its chemical identity, the result is referred to as a mixture. In other words, there is no chemical interaction between the parts of a combination. According to how consistent they are and how well the components' particle sizes match up, mixtures are categorized.

A homogenous mixture is one in which it is impossible to see the substance's individual particles. example: a water and salt solution. A heterogeneous mixture is one in which the constituent particles are plainly visible. example: a water and chalk combination.

Therefore, in the above ways we can differentiate between homogeneous and heterogeneous mixture.

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Answer:

36g of H2O.

Explanation:

We'll begin by writing the balanced equation for the reaction:

2NaOH + H2SO4 —> Na2SO4 + 2H2O

Next, we shall determine the mass of NaOH that reacted and the mass of H2O produced from the balanced equation. This is illustrated below:

Molar mass of NaOH = 23 + 16 + 1 = 40g/mol

Mass of NaOH from the balanced equation = 2 x 40 = 80g

Molar mass of H2O = (2x1) + 16 = 18g/mol

Mass of H2O from the balanced equation = 2 x 18 = 36g.

From the balanced equation above, we can see evidently that:

80g of NaOH reacted to produce 36g of H2O.

Answer:National Integrated Ballistic Information Network

Explanation:

Answer:

National Integrated Ballistic Information Network

Explanation:

gradpoint

Carbocations are positively charged carbon atoms that are formed during certain chemical reactions. They can be classified as primary, secondary or tertiary based on the number of carbon atoms attached to them.

In general, tertiary carbocations are more stable than secondary carbocations, which are more stable than primary carbocations, as the alkyl groups attached to the carbocation stabilize the positive charge. However, in some cases, less substituted carbocations may be more stable due to resonance stabilization that occurs when they are adjacent to a π bond.

Resonance stabilization occurs when the carbocation can participate in resonance with adjacent π bonds, leading to delocalization of the positive charge over multiple atoms, which stabilizes the carbocation. In this specific case, the less substituted carbocation is more stable than the more substituted carbocation because it can participate in resonance with adjacent π bonds.

The more substituted carbocation, on the other hand, is only stabilized by the electron-donating effect of the alkyl groups, which is less effective in this case.

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According to the forces of attraction, the most likely state of matter of the substance mentioned is liquid.

Matter in chemistry, is defined as any kind of substance that has mass and occupies space that means it has volume .Matter is composed up of atoms which may or not be of same type.

Atoms are further made up of sub atomic particles which are the protons ,neutrons and the electrons .The matter can exist in various states such as solids, liquids and gases depending on the conditions of temperature and pressure.

The states of matter are inter convertible into each other by changing the parameters of temperature and pressure.According to law of conservation of matter , matter can neither be created nor destroyed only its state changes .

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Answer:

liquid

Explanation: liquid conforms to the shape of the container which it is held in.

The following is a responsibility of the Controlled Substances Diversion and Prevention Team: They should identify the potential for the diversion of controlled substances and recommend ways to minimize the threat.

The Controlled Substances Diversion and Prevention Team is a group of healthcare professionals that works to avoid the diversion of controlled substances in health care environments. The diversion of controlled substances happens when medications are obtained or used illegally rather than for their intended purpose.

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Answer:

3.33 tanques de O₂

Explanation:

Basados en la reacción:

2C₂H₂(g) + 5O₂(g) → 4CO₂(g) + 2H₂O(g)

2 moles de acetileno reaccionan con 5 moles de oxígeno produciendo 4 moles de dióxido de carbono y 2 moles de agua

La ley de Avogadro dice que el volumen de un gas bajo temperatura y presión constantes es proporcional a las moles de este gas. Así, como 2 moles de acetileno reaccionan con 5 moles de oxígeno, los litros de O₂ necesarios para quemar 9340L de acetileno son:

9340 L C₂H₂ × (5 moles O₂ / 2 moles C₂H₂) = 23350L de O₂

Si un tanque contiene 7x10³ L de O₂ serán necesarios:

23350L O₂ ₓ (1 tanque / 7x10³L) = 3.33 tanques de O₂

Answer:

B

Explanation:

Answer:

Explanation:

It's important to note that all of the variables listed could potentially affect the amount of jaggery that dissolves in water. However, in order to investigate the effect of water temperature on the amount of jaggery that dissolves, she should hold all other variables constant (such as the volume of water, size of jaggery, and texture of jaggery) and only vary the temperature of the water.

- By doing this, she can isolate the effect of water temperature on the amount of jaggery that dissolves and draw conclusions about the relationship between these two variables.

Let me know if you have any further questions.

The change in heat when 10g of water vapor at 100 degree celcius condenses to liquid water and then cools to 10 degree celcius is 26.38KJ

It is a transfer of a kinetic energy from one substance or object into another substance or object, or from an energy source to a medium or object. Such energy transfer can occur in three ways : radiation, conduction, convection.

Here, we want to calculate how much heat that's been released from the water vapor (steam) at 100 degree celcius, condenses to liquid water, and then cools down into 10 degree celcius.

Q = Q1 + Q2

Q1 = steam condensation takes place at 100 degree celcius.

Q2 = water cools down into 10 degree celcius

Q1 = m. Lv

Lv = latent heat of vaporization of water = 2260 J/g (standard)

m = mass of steam = 10g

Q1 = 10 * 2260 J/g = 22600 J

Specific heat of water = 4.2 J/g.K

ΔT = T final - Tcools down = (100 + 273) - (10 + 273) = 90 Kelvin

Q2 = m*c*ΔT

= 10 * 4.2 * 90

= 3,780 J

Q = Q1 + Q2

= 22,600 + 3,780

Q = 26,380J

1 J = 10^-3KJ

Q = 26.38KJ

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Answer:

Formaldehyde, ozone, carbon monoxide, and radon are common indoor air contaminants. Formaldehyde can come from building materials and household products, ozone can be produced by electronic devices, carbon monoxide can be produced by gas appliances, and radon can seep into homes from the ground. Sulfur oxides, on the other hand, are more commonly found in outdoor air pollution, particularly from industrial emissions and fossil fuel combustion.

Answer:

B Osmosis

Explanation:

The balanced equation for the given chemical reaction is:

Cu(s) + 4 HNO3(aq) → Cu(NO3)2(aq) + 2 NO2(g) + 2 H2O(l)

In this chemical reaction, copper (Cu) reacts with nitric acid (HNO3) to produce copper nitrate, nitrogen dioxide, and water.

A balanced equation is one where the number of atoms on both sides of the equation is the same. The balanced equation shows that one copper (Cu) atom reacts with four nitric acid (HNO3) molecules, forming one copper nitrate (Cu(NO3)2) molecule, two nitrogen dioxide (NO2) molecules, and two water (H2O) molecules.

Thus, when the given equation is balanced with the lowest whole-number coefficients, the coefficients are:

Cu(s) + 4 HNO3(aq) = Cu(NO3)2(aq) + 2 NO2(g) + 2 H2O(l).

Therefore, the coefficients of the equation are Cu(s) + 4HNO3(aq) + Cu(NO3)2(aq) + 2NO2(g) + 2H2O(l).

The solution to the problem above was provided with the correct balanced equation and a thorough explanation.

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The line segment of the graph that represents boiling is the segment where the temperature remains constant.

Explanation: During the process of boiling, a substance undergoes a phase change from a liquid to a gas. This phase change occurs at a specific temperature known as the boiling point.

When a substance is boiling, its temperature remains constant even though heat is being added.

Therefore, on the graph, the line segment that represents boiling is the one where the temperature remains steady. It indicates that the substance is undergoing a phase transition rather than an increase in temperature.

The length of this segment depends on the specific substance and its boiling point.

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A strategy known as Carbon Capture and Storage would remove some of the CO₂ from smokestack emissions of coal-burning power and industrial plants and convert it to a liquid to be pumped under pressure into underground storage sites.

Climate change is one of the most important environmental challenges facing humanity. Large amounts of carbon dioxide (CO₂) are released into the atmosphere through the combustion of fossil fuels, such as coal, and this contributes greatly to the rise in global temperature. For this reason, scientists and environmental organizations have sought a way to reduce CO₂ emissions. One such strategy involves carbon capture and storage (CCS).

Carbon capture and storage involves extracting CO₂ from the exhaust gases of coal-fired power plants and other industries. The CO₂ is separated from the other gases and converted into a liquid through a process known as CO₂ capture. The liquid can then be stored in subway sites at pressure level. This helps reduce CO₂ emissions, as the CO₂ is not released into the atmosphere, but is stored in the ground.

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Answer:

it is C 65

Explanation:

Answer:

bri its c 65

Explanation:

Answer:

i dont know

Explanation:

Explanation:

cooked rice

nutrient

carbohydrate.

Boiler eggs

nutrient

Protein.

Answer: The statement conjugate base of hydrofluoric acid is weaker than that of acetic acid is most likely true.

Explanation:

A strong acid upon dissociation gives a weak conjugate base. This can also be said as stronger is the acid, weaker will be its conjugate base or vice-versa.

Hydrofluoric acid is a strong base as it dissociates completely when dissolved in water.

For example, \(HF \rightleftharpoons H^{+} + F^{-}\)

The conjugate base is \(F^{-}\) which is a weak base.

Acetic acid is a weak acid as it dissociates partially when dissolved in water. So, the conjugate base of acetic acid is a strong base.

\(CH_{3}COOH \rightarrow CH_{3}COO^{-} + H^{+}\)

Thus, we can conclude that the statement conjugate base of hydrofluoric acid is weaker than that of acetic acid is most likely true.

Baking powders contain at least two active ingredients: a base and an acid. Baking soda (sodium bicarbonate) is responsible for the production of carbon dioxide (CO2) gas during baking.

Baking powders typically contain at least two active ingredients: a base and an acid. The base is usually baking soda (sodium bicarbonate), and the acid can be cream of tartar (potassium bitartrate), sodium acid pyrophosphate, or a combination of acids.

Among these ingredients, baking soda (sodium bicarbonate) is primarily responsible for the production of carbon dioxide (CO2) gas. When baking soda reacts with the acid in the presence of moisture, it undergoes a chemical reaction called acid-base reaction or neutralization reaction. This reaction produces carbon dioxide gas, which creates bubbles and causes the dough or batter to rise. The release of carbon dioxide gas during baking gives the baked goods their characteristic texture and lightness.

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