Give examples of environmental concerns I will be taking into account by a mining company when it created a reclamation plan for a mine site

-6.78x\(10^{3}\) kj /mol is the correct answer

What is the internal energy?

Rising temperature and changes in state or phase from solid to liquid and liquid to gas cause a rise in internal energy. Planetary bodies can be viewed as a fusion of heat engines and heat reservoirs

Internal drive U is the sum of the kinetic energy brought about by the motion of molecules and the potential energy brought about by the vibrational motion and electric energy of atoms. The energy contained in every chemical link is often referred to as internal energy. From a microscopic perspective, the internal energy can take on a variety of shapes. For any substance or chemical attraction between molecules.

Mol of decane = mass/ molar mass

                       =  1/142.29

1/142.29 mol gives internal energy =810.1 x58.8

So1 mol gives  810.1 x58.8x1/142.29 internal energy

so internal energy changes = 810.1 x58.8x1/142.29

                                              -6.78x\(10^{3}\) kj /mol

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Chemical equation shows that the reactants change and form the products as a result of the reactants and products being rearranged during the reaction which result in different combinations in the products.

This is referred to as a written representation of the process that occurs during a chemical reaction and contains the reactants and products involved and an example is

H₂ + O₂ ⇒ H₂O

It shows that reactants change and form the products because the  reactants and products are rearranged during the reaction and there is also a different combinations in the products.

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Naturally occurring elements exist as a mixture of isotopes, and the percentages of each isotope in any given element are constant.

Isotopes are variants of an element that have the same number of protons in the nucleus but different numbers of neutrons. Since the number of protons determines the element's atomic number, isotopes of the same element have the same atomic number but different atomic masses.

For example, carbon-12, carbon-13, and carbon-14 are three isotopes of carbon, with atomic masses of 12, 13, and 14, respectively. The relative abundance of each isotope varies from element to element, but the percentages of each isotope in any given element are constant and can be used to identify the element.

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Answer:

energy story for lactic acid fermentation

Explanation:

the reactants are pyruvate NADH and proton

The mass of 250 ml of water is 250 g.

The mass of a substance, when volume and density are given can be found by using the following formula:

mass = density × volume

Here,

density = 1 g/ml

volume = 250 ml

mass = 1 g/ml × 250 ml

         = 250 g

Therefore, the mass of 250 ml of water is 250 g.

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Answer:

Sorry mujhe nahi aata...

The molality of formic acid in the solution is 1.95 mol/kg.

The first step is to convert the given mass of formic acid into moles:
44 g / 36 g/mol = 1.22 mol
Next, we need to calculate the mass of nitrobenzene in kg:
625 g = 0.625 kg
Now we can use the formula for molality, which is:
molality = moles of solute / mass of solvent in kg
molality = 1.22 mol / 0.625 kg = 1.95 m
Therefore, the molality of formic acid in the solution is 1.95 m.
To calculate the molality of formic acid in the solution, we need to find the moles of formic acid and the mass of the solvent in kilograms. First, find the moles of formic acid:
Moles = (mass of formic acid) / (molar mass of formic acid) = 44 g / 36 g/mol = 1.22 moles
Next, convert the mass of nitrobenzene to kilograms:
625 g = 0.625 kg
Now, calculate molality:
Molality = (moles of formic acid) / (mass of nitrobenzene in kg) = 1.22 moles / 0.625 kg = 1.95 mol/kg
So, the molality of formic acid in the solution is 1.95 mol/kg.

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The change in energy for an electron in a hydrogen atom when it is excited from n=1 to n=5 is  2.09 x 10⁻¹⁸ J.

The change in energy for an electron in a hydrogen atom when it is excited from n=1 to n=5 can be calculated using the following formula:

  ΔE = E final - E initial

Where E final is the energy of the final state (n=5) and E initial is the energy of the initial state (n=1).

The energy of an electron in a hydrogen atom is given by the formula:

  E = -13.6 eV / n²

So, the energy of the initial state (n=1) is:

  E initial = -13.6 eV / 1² = -13.6 eV

And the energy of the final state (n=5) is:

  E final = -13.6 eV / 5² = -0.544 eV

Now we can calculate the change in energy:

  ΔE = E final - E initial = -0.544 eV - (-13.6 eV) = 13.056 eV

To convert from electron volts (eV) to joules (J), we can use the conversion factor:

  1 eV = 1.6 x 10⁻¹⁹ J

So, the change in energy in joules is:

  ΔE = 13.056 eV x (1.6 x 10⁻¹⁹  J / eV) = 2.09 x 10⁻¹⁸ J

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Answer:

Evaporation

Explanation:

Evaporation is the process by which water changes from the liquid state to the gaseous state.

Unlike boiling that only occurs at a specific temperature (boiling point), evaporation occurs at any temperature. This explains why water disappear when placed under direct sunlight or under a shade.

Answer:

If Carbon Dioxide levels go up then so does air temperature

Answer:

Explanation:

Here, we want to know what happens to a solution that becomes more acidic

A lesser ph (1-7) indicates acidity with the acidity being higher as the number becomes smaller

What this means is that a solution with a pH of 3 is more acidic than a solution with a pH of 5

Thus, when the acidity increases, it is expected that the pH of the solution decreases (it becomes smaller in number)

Charlotte, driving at 60.2 mi/h, would travel approximately 344 feet during the 3.91 seconds that she looked at her phone.

To find out how far Charlotte traveled, we can first convert her speed to feet per second since we're given the time she looked at her phone in seconds. We know that 1 mile is approximately 5280 feet, so Charlotte's speed in feet per second is 60.2 miles per hour multiplied by 5280 feet over 3600 seconds (the number of seconds in an hour). This comes out to be approximately 88 feet per second.

Therefore, in the 3.91 seconds that Charlotte looked at her phone, she would've traveled 88 feet per second times 3.91 seconds, which equals roughly 344 feet.

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Answer:

14 dimes

Explanation:

48 nickels = 48 x .05 = $2.40

$3.80 - $2.40 = $ 1.40

$1.40 / .10 = 14 dimes

The empirical formula is the simplest formula for a compound which is defined as the ratio of subscripts of smallest possible whole number of the elements present in the formula. It is also known as the simplest formula.

write a balanced equation for the reaction between tantalum pentachloride and water?

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To find the molecular formula, we will need to first find the molecular mass of the empirical formula and then divide the molecular molar mass by the empirical formula's molecular mass.

Explanation:

Given: Empirical formula = C2H5

Molecular molar mass = 58.14 g/mol

The molecular formula represents the actual number of atoms of each element in a molecule. It is a multiple of the empirical formula.

To determine the molecular formula, we must find the molecular mass of the empirical formula and divide the molecular mass of the compound by the molecular mass of the empirical formula.

The molecular formula mass is determined using the empirical formula mass as a factor. The molecular formula mass is divided by the empirical formula mass to determine the multiplier. The empirical formula is multiplied by the multiplier to get the molecular formula

.The empirical formula mass of C2H5 is (2 x 12.01) + (5 x 1.01) = 29.07 g/mol

Molar mass of the compound = 58.14 g/mol

Divide the molecular molar mass by the empirical formula for mass:58.14 / 29.07

= 2

This indicates that the empirical formula must be multiplied by 2 to obtain the molecular formula. Therefore, the molecular formula is C4H10.

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Answer:

\(0.75 \times 1000 = \)

Explanation:

Use ur calculator

Answer:

750m

Explanation:

1 km is equal to 1000m. Therefore all you have to do is multiply 0.75 by 1000 and you will get 750. Hope this helps! :)

The electron from the peak at a)104 MJ/mol would have the greatest velocity after ejection.

The electron from peak would have greatest electron velocity because the kinetic energy of an electron is directly proportional to its velocity, and the peak with the highest energy corresponds to the highest velocity.

To determine which electron would have the greatest velocity after ejection, we can use the principle of conservation of energy. The electron will gain kinetic energy as it is ejected, and this kinetic energy will depend on the difference between the energy of the incident photon and the ionization energy of the electron.

In this case, we are given the peaks representing different photon energies in units of MJ/mol. The ionization energy required to eject an electron is typically on the order of several electron volts (eV) rather than mega joules (MJ). Therefore, we need to convert the given energy values to electron volts.

1 MJ/mol is approximately equal to 96.49 kJ/mol, and 1 eV is approximately equal to 96.49 kJ/mol. So, we can convert the given values to eV by dividing them by 96.49.

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Answer:

The law of conservation of matter says that matter cannot be created or destroyed. In chemical equations, the number of atoms of each element in the reactants must be the same as the number of atoms of each element in the products

Explanation:

Answer:

A

Explanation:

The pillar of sustainability broken by recycling electronics in India is environmental sustainability. Implementing a law that restricts electronics recycling to the US would not necessarily be the most effective solution, as it overlooks the complex global dynamics of electronic waste management.

Recycling electronics in India often involves improper disposal methods, such as burning or dismantling without proper safety measures. This leads to environmental pollution, including the release of hazardous substances into the air, soil, and water, thus violating the principle of environmental sustainability.

However, simply mandating that electronics can only be recycled in the US may not be the most optimal solution. Electronic waste is a global issue, and restricting recycling to a single country disregards the fact that electronic products are manufactured and consumed worldwide. A more comprehensive approach to addressing electronic waste would involve international cooperation, strict regulations, and monitoring of recycling practices to ensure they meet environmental standards.

Efforts should focus on improving recycling practices globally, including promoting responsible electronic waste management, developing sustainable recycling infrastructure in multiple countries, and encouraging the adoption of safe and environmentally friendly recycling practices. This approach would foster global sustainability and address the challenges associated with electronic waste disposal more effectively than a geographically limited restriction.

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Answer: The molar concentration of the original perchloric acid is 0.1407 M.

The molar concentration of the original perchloric acid can be calculated using the following equation:
Molarity (M) = moles of solute (n) / volume of solution (V).

In this case, the moles of solute can be found by subtracting the volume of the base (0.43 mL) from the volume of the acid (55.00 mL) giving 54.57 mL of perchloric acid. We can then calculate the moles of solute by multiplying the volume of the acid by its molarity, which is 0.2000 M. Therefore, n = 54.57 mL x 0.2000 M = 10.914 mol.

We can now calculate the molarity of the perchloric acid using the equation M = n/V. V is the total volume of the solution, which is the volume of the acid (55.00 mL) plus the volume of the base (22.67 mL) giving 77.67 mL. Therefore, M = 10.914 mol/ 77.67 mL = 0.1407 M.

In conclusion, the molar concentration of the original perchloric acid is 0.1407 M.


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Percolation centrality is a network science measure that quantifies the relevance or centrality of a node in a network. It is based on the percolation idea.

which refers to the movement of a fluid (or information) through a porous media. Percolation centrality in the context of network centrality assesses the network's resilience to node removal and the extent to which nodes are linked to the rest of the network .Percolation centrality is a network science measure that quantifies the relevance or centrality of a node in a network. It is based on the percolation idea.  A node's centrality is measured by its involvement in aiding network percolation or information flow. It's frequently used to analyze complex systems including social networks, transportation networks, and biological networks.

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Answer:

In cold water, the food coloring diffuses (spreads out) through the water slowly. The hot water causes the food coloring to diffuse faster.

Explanation:

The main answer to the question is: The test statistic is 51.20 and the critical values are 9.591 and 34.170.

To explain the main answer, we are conducting a hypothesis test to determine if the population standard deviation of the pH of rain is indeed 0.5, as suggested by the theory. The null hypothesis (H0) is that the population standard deviation is 0.5, while the alternative hypothesis (H1) is that the population standard deviation is not 0.5.

In this case, we are given a random sample of 21 rainy days, and the sample standard deviation is 0.8. To test the hypothesis, we need to calculate the test statistic, which is given by the formula: test statistic = [(sample standard deviation) - (hypothesized standard deviation)] / (sample standard deviation / sqrt(sample size)).

Plugging in the values, we get: test statistic = [(0.8 - 0.5) / (0.8 / sqrt(21))] = 51.20.

To determine the critical values, we need to look at the critical region associated with the given significance level (alpha) of 0.05. Since this is a two-tailed test, we divide the significance level by 2, resulting in an alpha of 0.025 for each tail. Using the degrees of freedom (n-1), which is 20 in this case, we can consult the t-distribution table or use a statistical software to find the critical t-values. For an alpha of 0.025 and 20 degrees of freedom, the critical t-values are approximately ±2.093.

Converting the t-values to critical values using the formula: critical value = (hypothesized standard deviation) + (t-value * (sample standard deviation / sqrt(sample size))), we get: critical values = 0.5 + (2.093 * (0.8 / sqrt(21))) = 9.591 and 0.5 - (2.093 * (0.8 / sqrt(21))) = 34.170.

Therefore, the correct answer is: The test statistic is 51.20 and the critical values are 9.591 and 34.170.

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The number of atoms of v are preset in each unit cell is 2.

This unit cell uses nine  atoms, eight of which are corner atoms forming the  cell and one  further in the center of the  cell. The corners contribute only one net  atom and the center atom contributes another for a aggregate of two  atoms.

In a BCC ( body centered cubic) unit cell, there's one atom fully contained within the unit cell at the chassis  point in the center, and the chassis  spots at each of the eight corners are also  enthralled, but each of those is participated between eight neighboring unit cells.

So the total number of  atoms for each unit cell is

= > 18/8

= > 2

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A reasonable mass for the water in the cup after the ice melts would be 225 grams.

When the ice melts, it undergoes a phase change from a solid to a liquid, while the total mass of the system remains constant.

The mass of the water in the cup after the ice melts would be the sum of the initial mass of the liquid water and the mass of the ice.

Initial mass of liquid water = 125 grams

Mass of ice = 100 grams

The total mass of water after ice melts = Initial mass of liquid water + Mass of ice

Total mass of water = 125 grams + 100 grams = 225 grams

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Answer:

Separate compounds into their components

The excess reagent is FeCl₃ and 0.33 moles of FeCl₃ remains unreacted after igniting 3.00 moles of FeCl₃ with 2.00 moles of O₂ gas.

The balanced chemical equation for the reaction between FeCl₃ and O₂ is:

4 FeCl₃ + 3 O₂ → 2 Fe₂O₃ + 6 Cl₂

From the balanced equation, we can see that for every 4 moles of FeCl₃, we need 3 moles of O₂.

To determine what is the excess reagent and how much of it is left over, we need to calculate the amount of each reagent required for complete reaction:

3.00 moles FeCl₃ × (3 moles O₂/4 moles FeCl₃) = 2.25 moles O₂ required

2.00 moles O₂ × (4 moles FeCl₃/3 moles O₂) = 2.67 moles FeCl₃ required

Since we only have 2.00 moles of O₂ available, this is the limiting reagent and there is not enough O₂ to react completely with all 3.00 moles of FeCl₃. Therefore, FeCl₃ is the excess reagent.

The amount of excess reagent remaining can be calculated by subtracting the amount required for complete reaction from the amount initially present:

Excess FeCl₃ = 3.00 moles - 2.67 moles = 0.33 moles

Therefore, there is an excess of 0.33 moles of FeCl₃ remaining unreacted. There is no excess of O₂ remaining, as we started with less than the amount required for complete reaction.

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Answer:

Yes it is a chemical reaction

Explanation:

The spoiling of the food is a chemical reaction becouse once the food is spoilt it cannot become it's original form again