A certain mixture of reacting chemicals contained in a spherical tank generate heat at the rate of 168746.9 W m^−3. If the inner and outer diameters of the tank wall are 99.5 and 100.2 cm, respectively, estimate the temperature drop (in °C ) across the wall. The tank walls are made of steel whose conductivity may be taken to be 18 W m^−1K^−1

The molar mass of the unknown gas will be 70.75 g / mol.

What is graham law?

Graham's law states that the rate of diffusion or of effusion of a gas is inversely proportional to the square root of its molecular weight.

R1 / R2 = √ M2 / M1

            = t2 / t1

Rn2/ R unknown = √ M unknown / Mn2

M unknown / 28gm/mol      =  t unknown / t N2

                           = 337 x 337 / 212 x 212 sec

                           = 337 x 337 x 28 / 212 x 218

                           = 70.75 gm / mol

The molar mass of the unknown gas will be 70.75 g / mol.

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Cesium Sulfite Chemical Formula:

Cs2SO3

Bach's cantatas were distinguished from the simple melodies of the Lutheran chorales on which they were based in several ways. These include the lush string accompaniments, a double chorus, the addition of counterpoint, and narration by a tenor evangelist.

Lush string accompaniments:

Bach's cantatas often featured lush string accompaniments. This helped to create a rich and complex sound that was very different from the simple melodies of the chorales on which they were based.

A double chorus:

Bach's cantatas also often featured a double chorus. This means that there were two choirs singing at the same time. This added to the complexity and richness of the music.

Addition of counterpoint:

Bach's cantatas also featured the addition of counterpoint. This is when two or more melodies are played at the same time. Bach was a master of counterpoint and used it to create complex and beautiful music.

Narration by a tenor evangelist:

Finally, Bach's cantatas often featured narration by a tenor evangelist. This is when a tenor singer tells the story of the cantata. This helped to make the cantatas more like operas and added to their dramatic effect.

In conclusion, Bach's cantatas were distinguished from the simple melodies of the Lutheran chorales on which they were based in several ways. These include the lush string accompaniments, a double chorus, the addition of counterpoint, and narration by a tenor evangelist.

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Answer:

Nitrogen fixation is the process of converting nitrogen to a usable form.

The answer to whether ethyl acetate is a polar or non-polar solvent is that it is a polar solvent.

Ethyl acetate is an organic solvent with a molecular formula of C4H8O2. It has a dipole moment due to its polar carbonyl group, which creates a partial positive charge on the carbon atom and a partial negative charge on the oxygen atom. The dipole moment makes ethyl acetate a polar solvent.

Polar solvents dissolve polar compounds, such as salts and acids, as well as non-polar compounds with polar functional groups, such as alcohols and ketones. Ethyl acetate is commonly used as a solvent in various applications, including in the production of pharmaceuticals, perfumes, and lacquers.
In summary, ethyl acetate is a polar solvent due to the dipole moment created by its carbonyl group. I hope this answers your question thoroughly.

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Taking 1 ml of solution Y out of the first beaker does not change the concentration of the remaining solution, and the concentration of the second and third beakers, which contain only water, remains 0.

Taking 1 ml of solution Y (pure bleach) out of the first beaker does not change the solution's concentration because the volume of the solution removed is relatively small compared to the total volume of the solution in the beaker. The concentration of a solution is defined as the amount of solute dissolved in a given volume of the solution.

In this case, the dark blue beaker labeled 100 millimeters Y contains a certain concentration of solution Y. Removing 1 ml of solution Y from the beaker does not alter the concentration of the remaining solution in the beaker significantly.

The concentration of solution Y in the dark blue beaker, labeled beaker number 1, remains relatively unchanged.

The pale blue beaker labeled 99 millimeters H₂O is filled with water (H₂O). Since only water is present in this beaker, the concentration of the solution is 0.

The removal of 1 ml of solution Y from the dark blue beaker and its addition to the pale blue beaker does not affect the concentration of the water in the beaker. Therefore, the concentration of the second beaker, labeled beaker number 2, remains 0.

The white beaker labeled 99 millimeters H₂O also contains only water. Similarly, the addition of 1 ml of solution Y to this beaker does not change the concentration of the water. Therefore, the concentration of the third beaker, labeled beaker number 3, remains 0.

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Answer: when you burn something every action has a reaction. so if you put wood in the fire the wood would burn up into this coal like block once completely burnt through. after there is no more wood left to burn the fire would slowly die and there would just be the remains of the wooden block.

Answer:

The waves are behaving this way due to the simultaneous water drops landing in the water.

Explanation:

because ima smart baddie (≧▽≦)

After the market move where ABC Health Care's stock appreciates to $75, the customer can withdraw $3,000 in cash.

To calculate the cash that can be withdrawn, we need to consider the impact of the stock appreciation on the customer's equity in the investment. The initial investment was 200 shares purchased at $60 per share, which amounts to a total investment of $12,000 (200 shares * $60 per share). Assuming the initial margin requirement was met, let's say 50% of the investment, or $6,000, was the customer's equity. After the stock price appreciation to $75 per share, the investment value increases to $15,000 (200 shares * $75 per share). The customer's equity also increases proportionally to $7,500 (50% of $15,000). The difference between the current equity and the initial investment is the amount the customer can withdraw, which is $7,500 - $6,000 = $1,500. However, since the customer initially purchased 200 shares, the total withdrawal amount would be $1,500 * 200 / 200 = $1,500. Therefore, after the market move, the customer can withdraw $1,500, representing the increase in equity resulting from the stock appreciation.

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Answer:

b.a convex lens forms a smaller,real image.

Approximately 0.268 grams of sodium azide needs to be loaded into the airbag to fully inflate it at standard temperature and pressure.

To calculate the amount of sodium azide required to inflate an airbag, we first need to understand the chemical reaction that takes place. The sodium azide reacts with the potassium nitrate inside the airbag to produce nitrogen gas, which inflates the bag. The reaction is as follows:

\(2NaN_3 + 2KNO_3 \rightarrow3N_2 + 2Na_2O + K_2O\)

From the balanced chemical equation, we can see that 2 moles of sodium azide (NaN3) react to produce 3 moles of nitrogen gas (N2).

The volume of the airbag is given as 139 liters, which is equivalent to 0.139 cubic meters. At standard temperature and pressure (STP), the volume of one mole of gas is 22.4 liters. Therefore, the number of moles of nitrogen gas required to fill the airbag is:

n = V/STP = 0.139/22.4 = 0.00620 moles

To produce 3 moles of nitrogen gas, we need 2 moles of sodium azide. Therefore, the number of moles of sodium azide required is:

n(NaAzide) = (2/3) x n(N2) = (2/3) x 0.00620 = 0.00413 moles

The molar mass of sodium azide is 65 grams/mole. Therefore, the mass of sodium azide required to inflate the airbag is:

Mass = n(NaAzide) x Molar mass = 0.00413 x 65 = 0.268 grams

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To fully inflate an airbag, about 50 grams of sodium azide is required. This chemical is stored in the airbag and when the sensor detects a crash, it is ignited, producing nitrogen gas which inflates the bag.

Sodium azide is a highly toxic and explosive substance, and must be handled with great care during the manufacturing and installation of airbags. Once the airbag is deployed, the nitrogen gas produced by the reaction of sodium azide with a metal oxide is harmless and rapidly dissipates into the atmosphere.It is important to note that tampering with an airbag or attempting to remove sodium azide from an airbag is extremely dangerous and should never be attempted. Only trained professionals should handle airbag installation and removal.

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Among the given compounds, KF and NH\(_3\) act as weak bases in water.

Weak bases are substances that partially ionize in water and have a low affinity for accepting protons (\(H^+\)). Here's a list of the given compounds, and I'll explain which ones are weak bases:

1. KF - Weak base; it forms \(F^-\), which can accept a proton to form HF.
2. Ba(OH)\(_2\) - Not a weak base; it's a strong base due to the presence of the OH- ion.
3. NaCH\(_3\)COO - Not a weak base; it's a salt derived from a weak acid ( CH\(_3\)COOH) and a strong base (NaOH), so it's neutral in the water.
4. HI - Not a weak base; it's a strong acid.
5. CH\(_3\)COOH - Not a weak base; it's a weak acid.
6. NH\(_4\)Cl - Not a weak base; it's a salt derived from a weak base (NH\(_3\)) and a strong acid (HCl), so it's acidic in water.
7. NH\(_3\) - Weak base; it can accept a proton to form \(NH_4^+\).

So, among the given compounds, KF and NH\(_3\) act as weak bases in water.

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Answer:

there are \(\sf 9*10^{-9}\)  moles in grams \(\sf 5.4 * 10^{-9}\) of silicon dioxide.

Explanation:

\(\boxed { \boxed{ \sf moles = \sf{\frac{mass}{Mr}} }}\)

we should know that:

using the formula:

\(\sf moles = \frac{mass}{Mr}\)

\(\sf moles = \frac{5.4*10^{-7}}{60}\)

\(\sf moles = 9*10^{-9}\)

Answer:

A cloud occurs when evaporated water condenses into visible water or ice. The three factors required in forming a cloud include: moisture, condensation, and temperature.

Explanation:

The scientist I have chosen is J.J. Thomson, who made significant contributions to the study of atomic structure in the late 19th and early 20th centuries.

Thomson's most well-known contribution is his discovery of the electron, which he identified as a negatively charged particle present in all atoms. This discovery formed the basis of Thomson's "plum pudding" model of the atom, which proposed that atoms consisted of a positively charged "pudding" with negatively charged electrons scattered throughout.

While this model was eventually disproven, Thomson's discovery of the electron and his work on the measurement of atomic and molecular masses laid the foundation for the modern atomic model. Specifically, Thomson's work on mass spectrometry led to the development of more advanced techniques for determining the masses and properties of atoms and molecules, which are still used in modern research today.

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The Krebs cycle is the most important of the metabolic pathways used to generate energy.

Even though it only directly produces two ATP molecules, the entire process is essential for the production of additional ATP molecules through oxidative phosphorylation. The Krebs cycle also produces a number of other important molecules, including NADH and FADH2, which are then used to generate more ATP in oxidative phosphorylation. In addition, the cycle is essential for the synthesis of many other important molecules, such as amino acids and lipids.

The Krebs cycle is essential for the production of energy, even though it only directly produces two ATP molecules. It is also essential for the production of other important molecules, such as NADH and FADH2, and is necessary for the synthesis of amino acids and lipids.

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Fatty acid A is linoleic acid (9,12-octadecadienoic). Fatty acid A is an omega-6 fatty acid. And the shorthand notation for fatty acid A is 18:2 Δ9,12

Fatty acid A is linoleic acid (9,12-octadecadienoic). Now, let's determine the omega designation for linoleic acid:

Since the first double bond is located at position 9 from the carboxyl end, linoleic acid is classified as an omega-6 fatty acid. The omega-6 designation indicates that the first double bond is 6 carbons away from the methyl end of the fatty acid chain.

The shorthand notation for linoleic acid is as follows:

18:2 Δ9,12

Let's break down the notation:

"18" represents the number of carbon atoms in the fatty acid chain.

"2" indicates the number of double bonds present in the fatty acid.

"Δ9,12" specifies the position of the double bonds in relation to the carboxyl end of the fatty acid chain. In this case, the double bonds are located at positions 9 and 12.

Therefore, the answers to your questions are as follows:

(i) Shorthand notation for fatty acid A (linoleic acid): 18:2 Δ9,12

(ii) Fatty acid A (linoleic acid) is an omega-6 fatty acid.

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Explanation:

Using a derivative of the combined gas law we can explain what is happening in both instances.

Assuming that the volume is constant which is predicated on the bottle shape and structure, the pressure of a given mass of gas varies directly with the absolute temperature.

As temperature increases, the pressure also increases and vice versa.

Answer: Extensive!

Explanation:

The compound formed when magnesium oxide reacts with water is magnesium hydroxide (Mg(OH)₂).

Magnesium oxide (MgO) is an ionic compound consisting of magnesium cations (Mg²⁺) and oxide anions (O²⁻). When it reacts with water (H₂O), the oxygen atom in water attracts the magnesium cation, leading to the formation of magnesium hydroxide.

The reaction can be represented as follows:

MgO + H₂O → Mg(OH)₂

In the resulting compound, magnesium hydroxide, there are two hydroxide ions (OH-) for every magnesium ion (Mg²⁺). The chemical formula Mg(OH)₂ represents this ratio.

Magnesium hydroxide is an alkaline compound and is commonly used as an antacid to treat heartburn and indigestion. It is also used in various industrial applications.

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Explanation:

Light can't get produced whilst a chemical reaction.

1) The temperature of the egg at time t can be calculated using the equation T(t) = 18 + 80 * e^(-0.168t), where t is the time measured in minutes.

2) The realistic domain of the temperature function is t ≥ 0, meaning time cannot be negative.

3) A rough analysis of the temperature function shows an exponential decay curve starting at 98°C and approaching 18°C asymptotically. There is an intercept at t = 0, corresponding to the initial temperature of 98°C.

4) It takes approximately 18.17 minutes for the egg to cool to a temperature of 20°C.

1.

To solve for T(t), we can use the formula derived from Newton's Law of Cooling:

T(t) - Ts = (T0 - Ts) * e^(-kt)

Given the initial conditions:

T0 = 98°C (initial temperature of the egg)

Ts = 18°C (surrounding temperature)

T(5) = 38°C (temperature of the egg after 5 minutes)

We can substitute these values into the equation:

T(5) - 18 = (98 - 18) * e^(-5k)

20 = 80 * e^(-5k)

Dividing both sides by 80:

1/4 = e^(-5k)

Take the natural logarithm of both sides:

ln(1/4) = -5k

Solving for k:

k = -ln(1/4) / 5 ≈ 0.168

Now we have the value of k. We can substitute it back into the equation to get the temperature function:

T(t) - 18 = (98 - 18) * e^(-0.168t)

Simplifying further:

T(t) = 18 + 80 * e^(-0.168t)

2.

The realistic domain of the temperature function is t ≥ 0 since time cannot be negative.

3.

Analyzing the function:

The function is exponential decay, starting at 98°C and approaching 18°C asymptotically. There is an intercept at t = 0, where the temperature is 98°C. As time progresses, the temperature decreases and approaches 18°C. However, it never reaches exactly 18°C due to the exponential decay nature of the function.

4.

To find the time it takes for the egg to cool to a temperature of 20°C, we can substitute T(t) = 20 and solve for t:

20 = 18 + 80 * e^(-0.168t)

2 = 80 * e^(-0.168t)

Dividing both sides by 80:

1/40 = e^(-0.168t)

Taking the natural logarithm of both sides:

ln(1/40) = -0.168t

Solving for t:

t = -ln(1/40) / (-0.168) ≈ 18.17 minutes

Therefore, it takes approximately 18.17 minutes for the egg to cool to a temperature of 20°C.

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Answer:

2 NaI ---> 2 Na + I₂

Explanation:

The only way the reactant NaI can decompose is by separating into 2 atoms, Na and I. However, you must take into account that iodine (I) exists as a diatomic molecule.

An equation is balanced when there is an equal amount of each element on both sides of the reaction. These amounts can be modified by adding coefficients in from of the molecules/atoms.

The unbalanced equation:

NaI -----> Na + I₂

Reactants: 1 sodium, 1 iodine

Products: 1 sodium, 2 iodine

The balanced equation:

2 NaI ---> 2 Na + I₂

Reactants: 2 sodium, 2 iodine

Products: 2 sodium, 2 iodine

True. Some nitrogen-containing fertilizers can be significant sources of soil acidity in cultivated soils.

When these fertilizers break down, they release hydrogen ions, which can lower the pH of the soil and increase its acidity. When these fertilizers are applied to the soil, they undergo a process called nitrification, which converts the nitrogen in the fertilizer into forms that plants can use.

During this process, nitrate ions are produced, which are negatively charged and can displace positively charged ions, such as calcium, from the soil particles. As a result, calcium and other positively charged ions may be leached from the soil, leading to soil acidity.

Additionally, the nitrification process produces hydrogen ions, which can also contribute to soil acidity. Over time, the repeated application of nitrogen-containing fertilizers can lead to a decrease in soil pH and a decline in soil fertility.

To mitigate the negative effects of nitrogen fertilizers on soil acidity, it is recommended to use these fertilizers judiciously and to monitor soil pH levels regularly. Liming, which involves the application of calcium carbonate or other alkaline materials, can also help to neutralize soil acidity.

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Some nitrogen-containing fertilizers are significant sources of soil acidity in cultivated soils. This occurs due to the chemical reactions that take place when nitrogen-based fertilizers are applied to the soil.

Step 1: Nitrogen-containing fertilizers, such as ammonium nitrate or urea, are applied to the soil.

Step 2: Once applied, the ammonium (NH4+) in these fertilizers is converted to nitrate (NO3-) through a process called nitrification. This process releases hydrogen ions (H+).

Step 3: The release of hydrogen ions increases the concentration of H+ in the soil, resulting in a drop in pH levels and, consequently, increased soil acidity.

Step 4: High soil acidity can negatively impact plant growth, nutrient availability, and soil structure, which may require corrective actions such as the addition of lime to restore the soil's pH balance.

In summary, nitrogen-containing fertilizers can be significant sources of soil acidity in cultivated soils due to the chemical reactions and release of hydrogen ions during the nitrification process.

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Answer:

43 protons and 99 neutrons.

Explanation:

The sulfuric acid solution has a concentration of 4.904 grams per liter (or dm3).

With the chemical formula H₂SO₄, sulfuric acid is a potent, colorless, odorless, and extremely corrosive mineral acid. It is also referred to as "vitriol oil." An extremely significant industrial chemical, sulfuric acid is used to make a variety of goods, including fertilizers, detergents, pigments, dyes, medicines, and explosives.

The formula below can be used to get the molar mass of sulfuric acid (H₂SO₄):

H₂SO₄'s molar mass is calculated as follows: 2 × (1.008 g/mol) + 32.06 g/mol + 4(16.00 g/mol) = 98.08 g/mol.

Hence, 98.08 g equals one mole of sulfuric acid.

We must multiply the molarity by the sulfuric acid's molar mass in order to translate the molarity (0.05 M) to grams per liter:

4.904 g/L = 0.05 mol/L x 98.08 g/mol

As a result, the sulfuric acid solution has a concentration of 4.904 grams per liter (or dm³).

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Considering the definition of STP conditions and Avogadro's Number, 1.952496 L of methane will occupy 5.25×10²² molecules at STP.

The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.

Avogadro's Number is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.

You can apply the following rule of three: if 6.023×10²³ molecules are contained in 1 mole of methane, then 5.25×10²² molecules are contained in how many moles of methane?

amount of moles of methane= (5.25×10²² molecules × 1 mole)÷ 6.023×10²³ molecules

amount of moles of methane= 0.087165 moles

There are 0.087165 moles of methane in 5.25×10²² molecules.

You can apply the following rule of three: if by definition of STP conditions 1 mole of methane occupies a volume of 22.4 liters, 0.087165 moles occupies how much volume?

volume= (0.087165 moles× 22.4 L)÷1 mole

volume= 1.952496 L

Finally, 1.952496 L of methane will occupy 5.25×10²² molecules at STP.

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