superficial frostbite is a blank and results in blank

Answer:

To calculate the percent yield, we need to divide the actual yield (250 L) by the theoretical yield (in liters) and then multiply by 100%.

Percent Yield = (actual yield / theoretical yield) x 100%

So, if we know the theoretical yield of CO2 in liters and we want to calculate the percent yield of 250L of CO2 collected as the actual yield, we need to insert the theoretical yield in the equation.

For example, let's assume that the theoretical yield of CO2 is 350L.

Percent Yield = (250 L / 350 L) x 100% = 71.42%

This is close to option A) 72%. So, The percent yield of 250L of CO2 collected for the actual yield is 72%

Keep in mind that this is a theoretical example and the actual yield percentage will vary depending on the reaction and the experimental conditions.

Explanation:

Answer:

The elements of Group VIIA (new Group 17 – fluorine, chlorine, bromine, iodine, and astatine) are called the halogens (tan column). The term “halogen” means “salt-former” because these elements will readily react with alkali metal and alkaline earth metals to form halide salts

At 25% and 50% neutralization, the pH remains the same, approximately 3.14. At 100% neutralization, the pH increases significantly to approximately 12.70 due to the hydrolysis of the resulting salt NaF.

To solve this problem, we'll consider the reaction between HF and NaOH. HF is a weak acid and NaOH is a strong base. The reaction can be written as follows:

HF + NaOH → NaF + H₂O

Given that the initial concentration of HF is 0.150 M and the concentration of NaOH is 0.250 M, we'll use the stoichiometry of the reaction to determine the concentrations of HF and NaOH at different stages of neutralization.

A. When neutralization is 25% complete:

25% of the HF will react with NaOH, which means 75% of the HF remains. Since the reaction between HF and NaOH is 1:1, the concentration of HF remaining will be 0.150 M * 0.75 = 0.1125 M. The concentration of NaOH consumed will be 0.250 M * 0.25 = 0.0625 M.

To calculate the pH at this stage, we need to consider the dissociation of HF. HF dissociates as follows:

HF ⇌ H⁺ + F⁻

The Ka of HF is given as 7.2 x 10⁻⁴. We'll assume that the concentration of F⁻ is negligible compared to the concentration of HF.

Using the Ka expression, we can calculate the concentration of H⁺:

Ka = [H⁺][F⁻] / [HF]

7.2 x 10⁻⁴ = [H⁺][0.1125 M] / [0.1125 M]

[H⁺] = 7.2 x 10⁻⁴ M

Therefore, the pH at 25% neutralization is approximately -log(7.2 x 10⁻⁴) = 3.14.

B. When neutralization is 50% complete:

50% of the HF will react with NaOH, which means 50% of the HF remains.

The concentration of HF remaining will be 0.150 M (0.50) = 0.075 M.

The concentration of NaOH consumed will be 0.250 M (0.50) = 0.125 M.

Using the same Ka expression as before, we can calculate the concentration of H⁺:

Ka = [H⁺][F⁻] / [HF]

7.2 x 10⁻⁴ = [H⁺][0.075 M] / [0.075 M]

[H⁺] = 7.2 x 10⁻⁴ M

Therefore, the pH at 50% neutralization is approximately -log(7.2 x 10⁻⁴) = 3.14.

C. When neutralization is 100% complete:

At this point, all of the HF has reacted with NaOH, resulting in the formation of NaF and water. The concentration of HF is zero, and the concentration of NaF is equal to the concentration of NaOH consumed, which is 0.250 M (0.2000 L) = 0.050 M.

Since NaF is a salt of a strong base and a weak acid, it will hydrolyze to produce F⁻ ions and a small number of OH⁻ ions. The concentration of F⁻ will be 0.050 M, and the concentration of OH⁻ will be negligible compared to F⁻.

The solution will be basic due to the presence of F⁻ ions. The pH can be calculated from the pOH:

pOH = -log[OH⁻]

pOH = -log(0.050) ≈ 1.30

pH = 14 - pOH = 14 - 1.30 ≈ 12.70

Therefore, when neutralization is 100% complete, the pH is approximately 12.70.

At 25% and 50% neutralization, the pH remains the same, approximately 3.14. This indicates that the solution is buffered due to the presence of the weak acid HF and its conjugate base F⁻. However, at 100% neutralization, the pH increases significantly to approximately 12.70 due to the hydrolysis of the resulting salt NaF. The solution becomes basic at this point.

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The molecular formula of a compound is a whole number multiple of its empirical formula. The empirical formula of the hydrocarbon is C₄H₉.

The empirical formula of a compound can be defined as the formula which gives the simplest whole number ratio of atoms of various elements present in one molecule of the compound.

Here moles of 'C' = moles 'CO₂' = 6.16 / 44 = 0.14 moles

Moles of 'H' = 2 × moles 'H₂O' = 2 × 2.84/18.02 = 0.315 moles

Divide both number of moles by 0.14. Then we get

1 mol 'C' and 2.25 mol 'H'

Multiply both with 4 to obtain a whole number.

Then the number of carbon is 4 and that of hydrogen is 9.

Thus the empirical formula is C₄H₉.

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Answer: cleaning up after the lab, D.

Explanation:

The percentage of light that gets through Unpolarized light is 12.5%

A light wave that is vibrating in more than one plane is referred to as unpolarized light is called unpolarized light.

The General  formula  of unpolarized light is:

I transmitted = I0<cos2θ>all angles = ½I0.----------------(1)

Here we have to find I3/Io

Considering the I1 for the taking the value 0° and substitute in equation(1) we get

I1=1/2Io---------(2)

Next, we have to consider another value θ=45°, and substitute in equation(1) we get the I2 value.

I2=I1cos^2(45°-0)

I2=I1cos^2(45°)--------------(3)

Next, consider the last value  θ=90° and the substitute in equation(1),we get:

I3=I2cos^2(90°-45°)

I3=I2cos^2(45°)-----------(4)

I3=I2cos^2(45°)

   =I1cos^4(45°)

    =1/2Iocos^4(45°)

I3/Io=0.125

I3/Io=12.5%

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No, the Law of Conservation of Mass does not hold true for this case because the mass of reactant is not equal to the mass of product.

What is Law of Conservation of Mass?

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Answer:

(NH4) 3N

Explanation:

NH4 needs to multiply with the 3 and N needs to multiply by 1

Heat will flow from the titanium to the lead and from the iron to the titanium until the temperatures are equal.

Heat always flows from a region of higher temperature to a region of lower temperature until both regions reach thermal equilibrium. In this case, since the lead block is initially warmer than the titanium block and the iron block is initially even warmer than the lead block, heat will flow from the iron block to the lead block and from the lead block to the titanium block until all three blocks reach the same temperature.

However, it's important to note that heat will not flow directly from the iron block to the titanium block, because there is an intermediate block (the lead block) between them. Heat can only flow directly between the adjacent blocks in contact with each other, and the heat transfer process continues until all the blocks reach thermal equilibrium.

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A and B in a solution exhibit negative deviance from Raoult's law. As a result, molecules of A interact with molecules of B greater strongly than they do with molecules of A or B.

When the solution's overall vapour pressure considerably lower than the comparable vapour pressure in the case of the ideal solution, Raoult's law deviates from the norm in a negative way.

Because the intermolecular attractive interactions between A-A and B-B are weaker than any of those between A-B, the vapour pressure decreases, which is the cause of the negative deviation from Raoult's law.

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Periods are horizontal rows of elements in the periodic table that run from left to right.

Each period represents a principal quantum number or energy level in which the valence electrons of the elements are located.

As one moves from left to right across a period, the atomic number of the elements increases by one, meaning that the number of protons and electrons also increases. This increase in atomic number is associated with a corresponding increase in the number of valence electrons in the outermost energy level.

The properties of the elements change as one moves from left to right across a period. For example, the atomic radius generally decreases, while the ionization energy and electronegativity increase. This is due to the increasing effective nuclear charge experienced by the valence electrons, which pulls them closer to the nucleus, making it harder to remove them and increasing their attraction to other atoms.

Overall, the periods provide a useful way of organizing the elements in the periodic table based on their electronic structure and properties, allowing us to better understand and predict their behavior.

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Answer:

2Mg+O2 = 2MgO is the balanced equation of this reaction. When Mg +O2 reacts MgO is formed. The number of atoms of each element on reactant and product side must be equal

Explanation:

Ur welcome

Answer:

2Mg+O2 ⇒ 2MgO

Answer:

Extensive properties, such as mass and volume depend on the amount of substance present and are not useful in the identification of a substance. In this experiment, we will use three properties to identify a liquid substance: solubility, density and boiling point

The properties would be helpful in determining the identity of the liquids are; Boiling point, density, Solubility, Specific Heat, and Chemical Tests. Properties That Might Not Be as Helpful are; color, odor, viscosity, surface tension, vapor pressure.

Here's a breakdown of properties that would be helpful and those that might not be as useful:

Helpful Properties:

Boiling Point: The boiling point of a liquid is the temperature at which it changes from a liquid to a gas. It is a characteristic property that can help identify a substance, as different substances have distinct boiling points.

Density: Density is the mass of a substance per unit volume. It can be a useful property for identification, especially if the density of a liquid is unique to a particular substance.

Solubility: Solubility refers to the ability of a substance to dissolve in a particular solvent. Testing the solubility of a liquid in different solvents or with other substances can help identify it.

Specific Heat: Specific heat is the amount of heat required to raise the temperature of a substance by a certain amount. It can provide clues about the identity of a liquid based on its heat-absorbing behavior.

Chemical Tests: Conducting chemical tests, such as pH tests or reactions with specific reagents, can reveal unique chemical properties that aid in identification.

Properties That Might Not Be as Helpful:

Color: While color can sometimes provide information, many substances can have similar colors. Therefore, color alone may not be definitive for identification.

Odor: Similar to color, odor can vary and may not be distinctive enough to determine the identity of a liquid.

Viscosity: Viscosity is a measure of a liquid's resistance to flow. While it can be a characteristic property, it might not be sufficient on its own for accurate identification.

Surface Tension: Surface tension measures the force that causes the surface of a liquid to contract. While interesting, it may not provide enough information for precise identification.

Vapor Pressure: Vapor pressure can change with temperature, and while it's a characteristic property, it might not be the most practical for identification purposes.

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Answer:

The  mass of  \(Fe^{3+}\) present is  \(x = 7.2 *10^{4} \ ng\)

Explanation:

From the question we are told that

   The  diameter of the spot is  \(d = 1.0 \ cm\)

   The  volume of the  solution present is  \(v = 12 \mu L = 12 *10^{-6} \ L\)

    The  mass of  \(Fe^{3+}\) ions in  one  liter of solution is \(m_f = 6.0 \ g\)

Generally the mass of  \(Fe^{3+}\) ions present is  v is mathematically represented as

         \(x = \frac{v * m_f}{ 1}\)

           \(x = \frac{12 *10^{-6} * 6}{1}\)

           \(x = 7.2*10^{-5} \ g\)

Converting to nanograms

We have  

            \(x = 7.2*10^{-5} \ g = \frac{ 7.2*10^{-5}}{1 *10^{-9}} = 7.2 *10^{4} \ ng\)

Answer:

Mesosphere. This layer extends from around 31 miles (50 km) above the Earth's surface to 53 miles (85 km). The gases, including the oxygen molecules, continue to become denser as one descends. As such, temperatures increase as one descends rising to about 5°F (-15°C) near the bottom of this layer.

Explanation:

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The wavelength of yellow light is 580nm which is 580×10⁻⁹ m, so its frequency will be 5.17×10¹⁴ m/s.

The frequency and the wavelength are indirectly proportional to the each other. More is the wavelength, lesser is  frequency and vice-versa. The speed at which a wave travels is equal to  product of the frequency and wavelength, which justifies  link between these two parameters.

V = λ f

where,

V is  wave speed,

f is wave frequency,

λ is  wavelength.

Given that,

Wavelength = 58.9nm

Speed of light= 3×10⁸ m/s

The frequency of yellow light will be

ν= c/λ

​ =   3.0×10⁸ m/s/ ​580×10⁻⁹ m

=5.17×10¹⁴ m/s.

The wave number of yellow light,

νˉ = 1/λ

= 1/580×10⁻⁹ m

=1.72×10⁶/m.

So, the frequency of the sodium lamp will be 5.17×10¹⁴ m/s.

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Answer: Segment B

Explanation:

On a graph, a line traveling upwards from left to right is considered positive. A line traveling downwards from left to right is considered negative. A line neither traveling upwards or downwards is neutral. Based on this, we can see that segment B is traveling downwards, so it would represent a negative acceleration.

The option that directly contributes to global climate change by releasing carbon dioxide into the atmosphere is generating electricity at a nuclear power plant. Nuclear power plants use nuclear reactions to produce electricity, and in the process, they emit carbon dioxide.

This is because the construction and maintenance of nuclear power plants require the use of fossil fuels, which are burned to produce the necessary energy. This, in turn, releases carbon dioxide into the atmosphere. The other options, such as using foams and packing materials that contain chlorofluorocarbons, transporting products from one continent to another on a cargo ship, and growing fast-growing crops in open fields, contribute to global climate change indirectly, through processes such as deforestation, which releases carbon dioxide, or the use of fossil fuels in transportation. In conclusion, generating electricity at a nuclear power plant directly contributes to global climate change through the direct release of carbon dioxide into the atmosphere.

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Answer:

A, B, C

Explanation:

Answer:

The answer is An eathquake

Explanation:

I got it from the internet

A. The line-bond structural formula for water (H2O), sodium chloride (NaCl), methane (CH4), hydrogen gas (H2), and ammonia (NH3) are as follows: Water (H2O):It consists of one oxygen atom and two hydrogen atoms that are bonded with a polar covalent bond.

The bond in CH4 is nonpolar because the atoms share electrons equally.H2 (hydrogen gas):It consists of two hydrogen atoms that are bonded with nonpolar covalent bonds. The bond in H2 is nonpolar because the atoms share electrons equally.NH3 (ammonia):It consists of one nitrogen atom and three hydrogen atoms that are bonded with a polar covalent bond.

Hydrogen gas (H2):The shared electrons in the nonpolar covalent bond of hydrogen gas (H2) are shared equally by both hydrogen atoms, so they are positioned between them. Ammonia (NH3):The shared electrons in the polar covalent bond of ammonia (NH3) are closer to the nitrogen atom because nitrogen is more electronegative than hydrogen.

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Answer:

H - Cl2 +NaBr -> Br2+2NaCl

If there are 15 X atoms, the coefficient in front of the compound X3Y will be 5.

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Answer:

The right response is "28.13 mL".

Explanation:

The given values are:

Initial buret reading,

= 20.29 mL

Final buret reading,

= 48.42 mL

Now,

The dispensed titrant will be:

= \(Final \ reading - Initial \ reading\)

= \(48.42-20.29\)

= \(28.13 \ mL\)

Answer:d

Explanation: over time water evaporates which leaves you with the white crystals mass

A student in a beaker mixes 20.0 g of white KCl crystals with distilled water; no crystals are visible, and the solution is clear, indicating that the physical change has occurred, which is that after the water has evaporated, the white crystals in the beaker have a mass of 20.0 g; that is option d.

The physical change includes the change in the shape and size of the substances but not the chemical change, as in the case of here the crystal, which is left behind after the evaporation of the solution without any change in the chemical composition.

Hence, a student in a beaker mixes 20.0 g of white KCl crystals with distilled water; no crystals are visible, and the solution is clear, indicating that the physical change has occurred, which is that after the water has evaporated, the white crystals in the beaker have a mass of 20.0 g; that is option d.

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The number of photons required with a wavelength of 749 nm are needed to melt 445 g of ice is 5.12 × 10²³.

The energy of one photon is given as,

E = (h × C) / λ

E = (6.626 × 10⁻³⁴ × 3 × 10⁸ m/s) / (749 nm × 10⁻⁹ nm/m)

⇒ E = 0.02653 × 10⁻¹⁷ = 2.65 × 10⁻¹⁹ J

The enthalpy of fusion of water is 333.55 J/g.

To melt 445 g of ice, the energy needed = 445 g × 333.55 J/g = 135755 J

Hence, the number of photons required = (135755 J) / (2.65 × 10⁻¹⁹)

                                                                   = 51228.301 × 10⁻¹⁹

                                                                   = 5.12 × 10²³

Hence the number of photons required is 5.12 × 10²³.

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Answer:

answer #1 used throughout the world to power devices, appliances and methods of transportation utilized in daily life. To make things operate, electrical energy must be emitted from energy sources such as power plants, to enable an object to consume the power it needs to function. ((if you want to cut it down short use the two first sentences))

answer #2 We get solar heat energy from the sun, and sunlight can also be used to produce electricity from solar

Explanation: