Why can transferring energy into or out of a substance change molecules’ freedom of movement?.

To attenuate sound in decibels, increasing the distance, decreasing the level, or adding a barrier are effective methods. However, D. adding fuzz does not contribute to sound attenuation.

The attenuation of sound in decibels (dB) refers to the reduction in the intensity or level of sound. The factors that affect sound attenuation include distance, level, and barriers. However, adding fuzz does not contribute to sound attenuation.

A. Increasing the distance: As sound travels through the air, its intensity decreases with distance. This is known as the inverse square law, which states that sound intensity decreases by 6 dB for every doubling of the distance from the source.

B. Decreasing the level: Sound attenuation can be achieved by reducing the level or amplitude of the sound waves. This can be done through techniques such as soundproofing, using materials that absorb or reflect sound waves.

C. Adding a barrier: Barriers, such as walls, partitions, or acoustic panels, can obstruct the path of sound waves, resulting in their absorption or reflection. This reduces the sound level and contributes to attenuation.

D. Adding fuzz: Adding fuzz, which refers to a type of soft and fuzzy material, does not have any inherent sound attenuation properties. It is unlikely to absorb or reflect sound waves effectively, and therefore, it does not contribute to sound attenuation.

To attenuate sound in decibels, increasing the distance, decreasing the level, or adding a barrier are effective methods. However, adding fuzz does not contribute to sound attenuation.

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Answer:wine

Explanation:it’s made from grapes

Answer:

x=676

Explanation:

Answer:

x = 676

Explanation:

13*4 = 52

8*78 = 624

624 + 52 = 676

The statements correctly describe resonance structures is The actual molecule is an average of the Lewis structure. Therefore, option B is correct.

The representations known as Lewis structures, often referred to as Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures, depict the interactions between the atoms in a molecule as well as any lone pairs of electrons that may be present.

The electronic bonding of a single polyatomic species, including fractional bonds and fractional charges, is described by resonance structures, which are a collection of two or more Lewis structures.

In comparison to separate resonance structures, the resonance hybrid is more stable. The movement of a charge between two or more atoms is frequently represented by resonance structures. These atoms have a more evenly distributed charge, which makes it more stable.

Thus, option B is correct.

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answer:

The mass of 4×10²¹ atoms Pt is ≈ 1 g Pt.

explanation:

Answer:

3.2 moles of H2SO4

Explanation:

We need to start with a balanced equation.  Lets assume the sulfuric acid is formed from sulfur dioxide and water.

   SO2 + H2O = H2SO4

This equation is balanced.  (Check it)

It tells us that 1 mole of SO2 will form 1 mole of H2SO4, if the reaction proceeds as planned.  That's a molar ratio of 1 to 1.  They are equal.  What moles we react, we should expect the same number of moles of product.  [And we need 1 mole of water at the same time]

So if we react 3.20 moles of sulfur dioxide, and keep out lab partner back, we'll obtain 3.2 moles of H2SO4.

Answer:

B4

Explanation:

good day

Answer:

6000 ml

Explanation:

1 liter is a 1000 ml

Elthalpy change is the heat absorbed by water for the iron placed in water is 3072.3 Joules.

A thermodynamic system's enthalpy, which is one of its properties, is calculated by adding the system's internal energy to the product of its pressure and volume. It is a state function that is frequently employed in measurements of chemical, biological, and physical systems under constant pressure, which the large surrounding environment readily provides.

The amount of heat released or absorbed during a reaction that takes place under constant pressure is referred to as the enthalpy change. It has the sign H, which may be interpreted as "delta H."

The initial tempareture of the water is 21°C

Final temperature of the water is 28°C

Change in temperature is 28 - 21 = 7°C

Elthalpy change is the heat absorbed by water for the iron placed in water is 4.18*105*7 = 3072.3 Joules.

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Answer:

i fond nothing sooory

pic so PC

Answer: The herbicide (weed killer) takes away a plant's ability to get carbon dioxide. This causes the plant to not be able to produce glucose a source of energy for the plants. Even if there are plenty of water, sunlight, and chloroplasts, the photosynthesis process won't be complete without carbon dioxide. Once in the soil, herbicides can suffer alteration in their structure and composition, due to the action of physical, chemical, and biological processes. This action on the herbicides is the one that will determine their activity and persistence in the soil. Plants damaged by soil sterilant herbicides are the least likely to recover. Plants that show signs of growing out of the problem will likely recover. Plants that appear to lose vigor may not. The survival of damaged plants can be increased by reducing other stresses.

Answer:

Explained below.

Explanation:

Mixtures are basically substances which are formed by physically mixing two or more substances.

Compounds are substances which are formed by chemically combining two or more elements.

The sugar-water in the glaze is a mixture because it was formed by physically mixing sugar and water without any chemical combination.

The way Nicole can test to make sure she is using the sugar-water in the glaze is that the sugar and water can be visibly seen in the glaze whereas for the compound, it forms a new substance and as such the physical elements used to mix can't be identified.

The density of the peanut oil is 0.92 g/cm³

Density is defined as the mass of a substance per unit volume. To calculate the density of the peanut oil, we divide the mass of the sample by its volume.

Mass of the peanut oil sample = 56 g

Volume of the peanut oil sample = 60.9 cm³

Density = Mass / volume

Substituting the values:

Density = 56 g / 60.9 cm³

Calculating this, we find:

Density ≈ 0.918 g/cm³

Since we need to use the correct number of significant digits, we round the density to two decimal places, giving us a final value of 0.92 g/cm³.

Therefore, the density of the peanut oil is 0.92 g/cm³.

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Answer:

\(Q=113,000J\)

Explanation:

Hello there!

In this case, since the vaporization process is carried out in order to turn a liquid into a gas due to the addition of heat, we can use the following heat equation involving the heat of vaporization of water or any other substance:

\(Q=m*\Delta _{vap}H\)

Thus, since this heat of vaporization for water is 2259.36 J/g, we plug in this amount to obtain the total energy for this process.

\(Q=50*2259.36 J/g\\\\Q=113,000J\)

Which is positive due to the necessity of heat.

Regards!

Answer: Whats ur Question?

Explanation:

Answer:

4.97097

Explanation:

You traveled 4.97097 mph.

When solid converts to gas then heat is required to break the intermolecular forces of attraction between the particles. In this process heat increase but temperature remains the same. Therefore, the correct option is option B.

Phase transition is a process in which transition takes place from one state to another of a medium on changing temperature or pressure. Phase transition is a physical process as there is no breaking of old bond and forming of new bonds takes place.

During phase transition temperature remain constant as the extra heat that is given to the system that goes into breaking of intermolecular forces of attraction between the particles. So overall temperature remains same but heat keeps on increasing.

Therefore, the correct option is option B that is energy is absorbed by the substance to cause a phase change.

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Answer:

C8H20P4F8

Explanation:

Molecular formula is based off a ratio of the molecular formula's molar mass divided by the empirical formula's molar mass.

The molar mass of the empirical formula C2H5PF2 is 98.02g. We find this by adding the molar masses of all elements in the formula, multiplied by their subscripts.

2(12.01) + 5(1.01) + 30.97 + 2(18.99) = 98.02

We then divide the molecular molar mass by the empirical molar mass.

392.16/98.02 = 4

This tells us that the molecular formula has 4 times the mass of the empirical formula. Because mass comes from the elements in the formula, we multiply all the subscripts by 4 to get the molecular formula.

2x4 = 8

5x4 = 20

1x4 = 4

2x4 = 8

So the molecular formula is C8H20P4F8

Approximately 1.375 grams of sodium-24 remains after 60 hours.

The half-life of sodium-24 is 15 hours, which means that after every 15 hours, half of the remaining sodium-24 will decay.

To calculate the amount of sodium-24 remaining after 60 hours, we can divide the total time (60 hours) by the half-life (15 hours) to determine the number of half-life intervals.

Number of half-life intervals = 60 hours / 15 hours = 4 intervals

Since each half-life interval results in a halving of the amount, we can calculate the remaining amount of sodium-24 by multiplying the initial amount (22 grams) by (1/2) four times:

Remaining amount of sodium-24 = 22 grams * (1/2)^4 = 22 grams * (1/16) ≈ 1.375 grams

Therefore, approximately 1.375 grams of sodium-24 remains after 60 hours.

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Answer:

Rb>Na>P>S>Cl

Explanation:

In a group from up to down the atomic radius increases

In a row from left to right the atomic radius decreases.

It is due to low volume of electron that causes large distance between two electrons.

When the added electron goes to smaller quantum level, the repulsive force between two electrons is less because the electron which is added occupies small space due to less volume so there is a large distance between two electrons that leads to less force of repulsion.

If the electron has more volume so it occupies more space and there will more repulsive force between two electrons so that's why we can say that the smaller volume of electron is the reason of less repulsive force.

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Answer:

If a-b=5 and ab=4 find the value of a square 2 +b square 2

1. The differential equation satisfied by y(t) is:  dy/dt = 0.6 kg/min

The amount of salt in the tank after t minutes can be represented by the function y(t). We need to find the differential equation that y satisfies.
Initially, the tank contains 100 L of pure water, which means there is no salt in the tank. As time passes, a solution with a salt concentration of 0.3 kg/L is added at a rate of 7 L/min. The salt concentration in the tank will increase with the addition of this solution.
At the same time, the solution is drained from the tank at a rate of 5 L/min. This will result in a decrease in the salt concentration in the tank.
To find the differential equation satisfied by y(t), we need to consider the rate of change of salt in the tank.
Rate of change of salt in the tank = Rate of salt added - Rate of salt drained
The rate of salt added is given by the product of the concentration of the solution (0.3 kg/L) and the rate at which the solution is added (7 L/min). So, the rate of salt added = 0.3 kg/L * 7 L/min.

The rate of salt drained is given by the product of the concentration of the solution (0.3 kg/L) and the rate at which the solution is drained (5 L/min). So, the rate of salt drained = 0.3 kg/L * 5 L/min.

Therefore, the differential equation satisfied by y(t) is:
dy/dt = (0.3 kg/L * 7 L/min) - (0.3 kg/L * 5 L/min)

Simplifying the equation:
dy/dt = 2.1 kg/min - 1.5 kg/min
dy/dt = 0.6 kg/min

So, the differential equation satisfied by y(t) is:
dy/dt = 0.6 kg/min

2. The amount of salt in the tank after 40 minutes is 24 kilograms.

To find the amount of salt in the tank after 40 minutes, we can solve the differential equation.

dy/dt = 0.6 kg/min

Integrating both sides with respect to t:
∫dy = ∫0.6 dt

Integrating, we get:
y = 0.6t + C

To find the value of C, we can use the initial condition that the tank initially contains 100 L of pure water, which means there is no salt. So, at t = 0, y = 0.

Substituting these values into the equation:
0 = 0.6(0) + C
C = 0

Therefore, the equation becomes:
y = 0.6t

Now, we can find the amount of salt in the tank after 40 minutes by substituting t = 40 into the equation:
y = 0.6(40)
y = 24 kg


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Answer:

An ion with 11 protons, 11 neutrons, and 10 electrons would have a charge of 1+, also expressed as a charge of positive one or +1.

The manager should meet with the staffing department's director to discuss the unique staffing needs of the unit and how they can be addressed. During the meeting, the manager should provide specific examples of the issues they've encountered and their impact on the unit's performance.

The manager of a hospital unit is frustrated that the centralized staffing department does not understand the unique staffing needs of the unit. The manager should  provide data on the unit's unique staffing needs, such as the number of patients and the acuity of their illnesses, to help the staffing department better understand the situation. Additionally, the manager should offer potential solutions to the problem and be open to collaborating with the staffing department to find a resolution.

In conclusion, it is important for the manager of a hospital unit to communicate their staffing needs to the centralized staffing department and work collaboratively to find solutions. It's also important for the manager to provide specific examples and data to help the staffing department better understand the unique needs of the unit.

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The dissolution of carbon dioxide in a liquid is affected by various parameters, including the solubility of CO2 in the liquid, the partial pressure of CO2 above the liquid, the temperature of the system, and the mass transfer coefficient. In general, if the mass transfer coefficient is high, then the CO2 dissolution will be rate-limited by the solubility of CO2 in the liquid.

If the inlet flow rate of CO2 gas is more than sufficient to ensure that the CO2 dissolution is mass transfer limited, then the mass transfer coefficient will be the limiting factor in the CO2 dissolution process. In other words, the rate at which CO2 is transferred from the gas phase to the liquid phase will be slower than the rate at which CO2 dissolves in the liquid. This means that increasing the inlet flow rate of CO2 gas will not increase the rate of CO2 dissolution in the liquid.

However, if the inlet flow rate of CO2 gas is not sufficient to ensure that the CO2 dissolution is mass transfer limited, then increasing the inlet flow rate of CO2 gas can increase the rate of CO2 dissolution in the liquid. In this case, the rate of CO2 dissolution will be limited by the solubility of CO2 in the liquid, and increasing the inlet flow rate of CO2 gas will increase the partial pressure of CO2 above the liquid, which will increase the rate of CO2 dissolution in the liquid.

In summary, whether or not the inlet flow rate of CO2 gas is sufficient to ensure that the CO2 dissolution is mass transfer limited depends on the mass transfer coefficient and the solubility of CO2 in the liquid. If the mass transfer coefficient is high, then increasing the inlet flow rate of CO2 gas will not increase the rate of CO2 dissolution in the liquid.

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The pH at the equivalence point for the titration of 20.00 mL of 0.0250 M formic acid with standard 0.0250 M NaOH is 3.74.

The balanced chemical equation for the reaction is:

HCOOH + NaOH → H₂O + NaHCOO⁻

Firstly, let's calculate the number of moles of formic acid in 20.00 mL of 0.0250 M formic acid.

Number of moles = concentration × volume

Number of moles = 0.0250 M × 20.00 × 10⁻³ L

Number of moles = 5.00 × 10⁻⁴ mol

The balanced chemical equation for the reaction between formic acid and NaOH tells us that one mole of formic acid reacts with one mole of NaOH to form one mole of NaHCOO⁻.

Therefore, the number of moles of NaOH required for complete neutralization of 5.00 × 10⁻⁴ mol of formic acid is also 5.00 × 10⁻⁴ mol.

As the concentration of NaOH is also 0.0250 M, the volume of NaOH required for complete neutralization can be calculated as follows;

Number of moles = concentration × volume

Volume = number of moles / concentration

Volume = (5.00 × 10⁻⁴ mol) / (0.0250 M)

Volume = 0.0200 L or 20.00 mL

So, the volume of NaOH required for complete neutralization is 20.00 mL.

The pH at the equivalence point can be calculated using the following formula;

pH = pKa + log [salt]/[acid]

Here, the salt is sodium formate (NaHCOO⁻) and the acid is formic acid (HCOOH).

At the equivalence point, the number of moles of HCOOH = number of moles of NaHCOO⁻ . Therefore, the concentration of HCOOH and NaHCOO⁻ would be the same.

Concentration of HCOOH = Number of moles / Volume = 0.0250 M

Concentration of NaHCOO- = Number of moles / Volume = 0.0250 M

Therefore, the ratio of [salt] / [acid] = 1.

Substituting the values into the formula;

pH = pKa + log [salt]/[acid]

pH = 3.74 + log 1

pH = 3.74

Therefore, the pH at the equivalence point for the titration of 20.00 mL of 0.0250 M formic acid with standard 0.0250 M NaOH is 3.74.

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To answer this question we have to use the rule of dilutions:

Where V1 is the initial volume, C1 is the initial concentration, V2 is the final volume and C2 is the final concentration. In this case we need to find V1.

Solve the equation for V1 and replace C1 for 4.00M, V2 for 665mL and C2 for 0.350M

It means that the volume required is 58.2mL.

Answer:

The formula mass of Na2S04 is 142.04 g/mol

Answer:

142.04 g/mol

Explanation:

the formula Na2SO4 means:two moles sodium (45.98g), one mile sulfur (32.06g), and four moles oxygen (64.00g) combine to form one mole of sodium surface (142.04g).

Answer:

Explanation:

The three of them increase from left to right across the periods of the periodic table, and at the same time, they decrease from up to down across the groups of the periodic table.

Ionization Energy is defined as the energy required to remove the atom of an electron.

Electron affinity is defined as the change in energy when electron is added to a negative ion.

Electronegativity is the ability of an atom to attract other atoms to itself.