why is cyanide heap leaching used to extract gold from some deposits?

Answer:

please make me brainalist

Explanation:

Chloride compounds can conduct electricity when fused or dissolved in water. Chloride materials can be decomposed by electrolysis to chlorine gas and the metal.

DDT (dichlorodiphenyltrichloroethane) is the insecticide that has been banned from developed countries.

DDT was first synthesized in 1874, but its insecticidal properties were discovered in 1939 by Paul Müller, a Swiss chemist. It was widely used during World War II to protect soldiers from malaria, typhus, and other insect-borne diseases.

However, in the 1960s, concerns about the environmental and health impacts of DDT began to emerge. In 1962, American biologist Rachel Carson published her influential book "Silent Spring," which highlighted the dangers of DDT, including its persistence in the environment, its bioaccumulation in the food chain, and its toxic effects on wildlife and humans.

As a result of growing public awareness and scientific evidence, many developed countries, including the United States, started to restrict or ban the use of DDT in the 1970s. The U.S. Environmental Protection Agency (EPA) banned DDT in 1972, and several other countries followed suit.

In 2001, the Stockholm Convention on Persistent Organic Pollutants was adopted, which aims to eliminate or restrict the production and use of persistent organic pollutants, including DDT. Currently, DDT is banned or restricted in most developed countries but is still used in some developing countries to control vector-borne diseases like malaria.

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The complete question is:

Which insecticide has been banned from developed countries?

group of answer choices:

Deet

Pyrethrin

Boric acid

DDT

Your experiment confirmed the third mechanism, where the rate-determining step has an iodide ion and a persulfate ion coming together. However, I'll provide answers for the scenarios you mentioned.

(a) If the first mechanism is correct (two iodide ions coming together), doubling the concentration of iodide ions while holding other concentrations constant would quadruple the rate, as the reaction involves two iodide ions.

(b) If the first mechanism is correct, doubling the concentration of persulfate ions while holding other concentrations constant would not affect the rate, as persulfate ions are not involved in the rate-determining step.

(c) If the second mechanism is correct (persulfate ion decomposing), doubling the concentration of iodide ions while holding other concentrations constant would not affect the rate, as iodide ions are not involved in the rate-determining step.

(d) If the second mechanism is correct, doubling the concentration of persulfate ions while holding other concentrations constant would double the rate, as the reaction involves one persulfate ion.

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A system refers to a defined region or portion of matter or space that is being studied or observed. Surroundings refer to everything outside of the system that can interact with it or influence it in some way. Isolated systems are those that do not exchange matter or energy with their surroundings. Closed systems, on the other hand, are those that can exchange energy with their surroundings but not matter. Open systems are the most flexible of the three, as they can exchange both matter and energy with their surroundings. State functions are properties of a system that depend only on its current state, such as temperature or pressure. Process functions are properties that depend on the path taken to arrive at a certain state, such as work or heat transfer.

1. System: A system refers to a specific part of the universe being studied or observed, which typically consists of a collection of matter and energy. It can be a physical object or a theoretical concept

2. Surroundings: The surroundings are everything external to the system, interacting with it through the exchange of matter, energy, or both.

3. Isolated systems: Isolated systems are systems in which there is no exchange of matter or energy with the surroundings. They are completely self-contained and completely closed off .

4. Closed systems: Closed systems are systems that allow the exchange of energy but not matter with their surroundings.So, while they are not completely isolated, they are still somewhat restricted in terms of what they can interact with.

5. Open systems: Open systems are systems that allow the exchange of both energy and matter with their surroundings.This means they have the potential for the most dynamic interactions and changes.

6. State functions: State functions are properties of a system that depend only on the current state of the system, not on the path taken to reach that state. They are independent of how the system arrived at that state.Examples of state functions include temperature, pressure, and internal energy.

7. Process functions: Process functions, on the other hand, are properties that depend on the path taken during a process, not just the initial and final states of the system. Examples of process functions include work and heat.

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Metals ending in -ous or -ic refer to their oxidation state. The -ous suffix is used to indicate the lower oxidation state of a metal while the -ic suffix indicates the higher oxidation state.

For example, iron can exist in the +2 oxidation state, which is referred to as ferrous (-ous suffix), or in the +3 oxidation state, which is referred to as ferric (-ic suffix). Similarly, copper can exist in the +1 oxidation state, which is referred to as cuprous, or in the +2 oxidation state, which is referred to as cupric.

It is important to note that not all metals have -ous or -ic suffixes to indicate their oxidation state and some metals can have multiple oxidation states that do not follow this naming convention.

The oxidation state of a metal is determined by the number of electrons it has either gained or lost in a chemical reaction. Understanding the oxidation state of a metal is important in predicting its reactivity and behavior in various chemical reactions.

Thus the "-ous" ending indicates the lower oxidation state, while the "-ic" ending signifies the higher oxidation state.

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Satin nickel and brushed nickel are both finishes that give a smooth and matte appearance, but there is a slight difference in their texture. Satin nickel has a soft and almost velvety texture, while brushed nickel has visible lines or scratches that create a textured look.

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The brushed nickel finish is achieved by using a wire brush to create those lines or scratches, while the satin nickel finish is achieved by applying a thin layer of lacquer or a similar substance to create a smooth, even finish. Overall, both finishes are great options for a modern and sophisticated look in your home, but it comes down to personal preference and the specific aesthetic you are trying to achieve.
The main difference between satin nickel and brushed nickel lies in the surface finish and appearance.
Satin nickel has a smooth, even, and slightly reflective surface finish that doesn't show visible brush strokes. It is created by applying a thin layer of nickel plating over a metal base, followed by a clear protective lacquer.
Brushed nickel, on the other hand, has a textured surface with visible brush strokes, giving it a more matte appearance. This finish is achieved by using a wire brush or abrasive pad to create a pattern of fine lines on the surface of the nickel plating.
Both finishes are popular choices for fixtures and hardware, as they provide a modern and elegant look while being resistant to tarnishing and wear.

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Particulates can be removed from smokestack emissions by electrostatic precipitators. So, option (b) is right one.

Particles are defined as small solid or liquid particles suspended in air. An electrostatic precipitator, also known as an electrostatic vacuum cleaner, is a device that uses electricity to remove certain impurities, such as particles or liquid droplets, from the air or other gases in chimneys. and other chimneys. The scouring fluid is used in conjunction with high pressure to aid material removal. Use settling as chambers. From above discussion it is correct choice is electrostatic precipitators. It concluded that right option is option(b).

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∆G <0 and the reaction is reactant-favoured. Hence these two are correct statement.

One or more chemicals, known as reactants, are changed into one or more new substances, known as products, during a chemical reaction. Chemical elements or chemical compounds make up substances. In a chemical reaction, the atoms that make up the reactants are rearranged to produce various products.

G > 0: Under normal circumstances, the reaction is not spontaneous because it entails reducing Co²+ ions to Co, which requires energy input. G is hence positive.

Since G is positive, the reaction is reactant-favored and not product-favored. The claim that "The reaction is reactant-favored" is thus true.

∆G > 0: Since the reaction is not spontaneous under normal circumstances, G is higher than zero.

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In a closed rigid system with multiple gases, you can use Dalton's Law of Partial Pressures to calculate the partial pressure exerted by a specific gas. The law states that the total pressure in a mixture of gases is equal to the sum of the individual partial pressures. Here, you have 7.0 mol CO₂, 7.0 mol Ar, 7.0 mol N₂, and 4.0 mol Ne, with a total pressure of 10.0 atm.

To find the partial pressure of neon gas, first calculate the mole fraction of Ne:
Mole fraction of Ne = (moles of Ne) / (total moles of gases)
Mole fraction of Ne = 4.0 / (7.0 + 7.0 + 7.0 + 4.0) = 4.0 / 25.0 = 0.16

Next, use the mole fraction to find the partial pressure of Ne:
Partial pressure of Ne = (mole fraction of Ne) × (total pressure)
Partial pressure of Ne = 0.16 × 10.0 atm = 1.6 atm

The partial pressure exerted by the neon gas in the system is 1.6 atm.

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My hypothesis regarding the change in urine volume was that subjects who drank water would have a higher urine volume compared to those who drank a sports drink. This is because water is a pure hydrating agent that does not contain any added sugars or electrolytes, unlike sports drinks.

Electrolytes in sports drinks cause the body to retain more water and decrease urine output, while added sugars increase urine output. Therefore, the physiologic basis for my prediction is that drinking water would lead to more frequent urination and higher urine volume due to the absence of any added electrolytes and sugars.

In terms of the results, they supported my prediction as the subjects who drank water had a significantly higher urine volume compared to those who drank a sports drink. However, there were a few subjects who had unexpected results where they had a higher urine volume after drinking a sports drink. This could be due to individual variations in their physiology, hydration status, or even their fluid intake before the study. Therefore, it is important to take into account individual variations when interpreting the results.

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Answer:

urine

Explanation:

urine tastes good :oP

The Cahn-Ingold-Prelog priority rules for designating E or Z to a compound.

The Cahn-Ingold-Prelog (CIP) priority rules are used to assign the E or Z configuration to a compound containing a double bond or an alkene. The rules are as follows:

1. Identify the two atoms directly attached to each carbon of the double bond.
2. Assign a priority to each of these atoms based on their atomic number. The atom with the higher atomic number receives a higher priority.
3. If the atoms have the same atomic number, move to the next set of atoms connected to these initial atoms and assign priorities based on atomic number. Repeat this process until a difference in priority is found.
4. Once priorities are assigned, look at the position of the higher priority groups relative to the double bond.
5. If the two higher priority groups are on the same side of the double bond, the configuration is Z (from the German "zusammen," meaning "together").
6. If the two higher priority groups are on opposite sides of the double bond, the configuration is E (from the German "entgegen," meaning "opposite").

By following these Cahn-Ingold-Prelog priority rules, you can accurately designate the E or Z configuration for a compound containing a double bond.

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The correct answer is true.  The equation is designed to calculate the pH of a solution based on the ratio of these molar concentrations

The Henderson-Hasselbalch equation relates the pH of a solution to the pKa, the concentration of the acid, and the concentration of the conjugate base. The equation is pH = pKa + log([A-]/[HA]), where [A-] is the concentration of the conjugate base and [HA] is the concentration of the acid. Both [A-] and [HA] can be expressed in units of molarity or moles. The equation will still give the same result as long as the units are consistent throughout the calculation.

When using the Henderson-Hasselbalch equation, you must input the concentrations of the acid/base in units of molarity, not moles. The equation is as follows:

pH = pKa + log ([A-]/[HA])

Here, [A-] represents the molar concentration of the conjugate base, and [HA] represents the molar concentration of the weak acid.

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Answer:

This problem can be solved using the ideal gas law:

PV = nRT

where P is pressure, V is volume, n is the number of moles of gas, R is the ideal gas constant, and T is temperature in Kelvin.

First, we need to convert the initial temperature of 20.0 °C to Kelvin:

T1 = 20.0 + 273.15 = 293.15 K

Next, we can assume that the number of moles of gas and the pressure remain constant throughout the compression process. Therefore, we can rearrange the ideal gas law to solve for the final temperature:

T2 = (P1V1/T1) * V2

where P1 is the initial pressure, V1 is the initial volume, and V2 is the final volume.

Since the problem does not provide information about the pressure or number of moles of gas, we can assume they are constant and cancel out of the equation:

T2 = (V2/V1) * T1

Plugging in the given values, we get:

T2 = (4.00 L / 6.00 L) * 293.15 K = 195.43 K

To find the decrease in temperature, we subtract the final temperature from the initial temperature:

ΔT = T1 - T2 = 293.15 K - 195.43 K = 97.72 K

Therefore, the temperature decreases by 97.72 K when 6.00 L at 20.0 °C is compressed to 4.00 L.

The molar concentration of CH4O in the equilibrium mixture is 0.16 M.



To find the molar concentration of CH4O, we need to use the equation for the equilibrium constant, Kc:

Kc = [CH4O]/([CO][H2])

We can rearrange this equation to solve for [CH4O]:

[CH4O] = Kc x [CO] x [H2]

We are given the molar concentrations of CO and H2 in the equilibrium mixture, so we can substitute these values into the equation:

[CH4O] = Kc x 0.41 M x 0.25 M

The value of Kc for this reaction is not given, so we cannot calculate the exact value of [CH4O]. However, we can use the fact that the reaction is exothermic to make an assumption about the value of Kc.

Since the formation of CH4O releases heat (ΔH < 0), the equilibrium constant must be relatively large. This means that the molar concentration of CH4O must be much smaller than the molar concentrations of CO and H2, so we can make the approximation that:

[CH4O] ≈ 0

This approximation is valid if the value of Kc is much smaller than 0.41 x 0.25 = 0.1025.

If we assume that [CH4O] = 0, we can check that this satisfies the equilibrium constant equation:

Kc = [CH4O]/([CO][H2]) = 0/(0.41 x 0.25) = 0

Therefore, the molar concentration of CH4O in the equilibrium mixture is negligible.

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The element which makes up the framework of organic compounds and which cycles through all ecosystems is carbon.

An organic compound is a compound that, in general, contains carbon covalently bound to other atoms, especially Carbon-Carbon (C-C) and Carbon-Hydrogen (C-H) (such as in hydrocarbons). A chemical compound refers to any substance made up of two or more elements that are chemically bonded together. Carbon is a key component of organic compounds, as it forms the basis for complex structures such as carbohydrates, proteins, lipids, and nucleic acids. It cycles through ecosystems via processes like photosynthesis, respiration, and decomposition, playing a crucial role in the carbon cycle.

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All of the isotopes listed have the same number of electrons, which is determined by the atomic number of the element.

Pa-238 and NP-238 have 91 electrons each because they are both isotopes of the element Protactinium, which has an atomic number of 91.

U-240 has 92 electrons because it is an isotope of Uranium, which has an atomic number of 92.

PU-239 also has 94 electrons because it is an isotope of Plutonium, which has an atomic number of 94.

Therefore, all of the isotopes listed have the same number of electrons, which is determined by the atomic number of the element.

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The Roman numerals in iron (II) or iron (III) refer to the oxidation state or the number of electrons that have been lost or gained by the iron atom.

In chemistry, oxidation is the loss of electrons, while reduction is the gain of electrons. In the case of iron (II), the Roman numeral "II" indicates that the iron atom has lost two electrons and has an oxidation state of +2.

Similarly, in the case of iron (III), the Roman numeral "III" indicates that the iron atom has lost three electrons and has an oxidation state of +3.

These oxidation states are important in understanding the chemical and physical properties of iron compounds, including their reactivity and ability to form chemical bonds. The Roman numerals also help to distinguish between different iron compounds that may have different oxidation states and therefore different properties.

Overall, the Roman numerals in iron (II) or iron (III) are used to indicate the number of electrons that have been lost or gained by the iron atom, which is an important factor in determining the properties and behavior of iron compounds.

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In the rate law equation, the letter'm' stands for Reaction order. Take the reaction mA products as an example; the rate law equation is rate=k[A]m. In this case, m stands for the Reaction order. Now, all we have to do to find the solution is utilize the definition of molarity.

Moles/liters. Therefore, the solution has a molarity (M) of 0.025 mol/L. Another method of measuring concentration is molality. Molality is calculated by dividing the number of moles of the solute by the kilograms of the solvent, which is typically water in this case. The rate law equation is represented in standard form as R = k[A]n[B]m.

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The question is incomplete complete question is given below

M(OH)_3 (aq) + 3 NH_4 +(aq) what does the m stand for in the above reaction?

The temperature of the water increases by 4.2°C as a result of the combustion of the peanut.

To calculate the temperature change of the water, we need to use the formula:

Q = mcΔT

First, we need to calculate the mass of water in the can. We know that the can contains 250 g of water.

Next, we can use the specific heat capacity of water, which is 4.18 J/g°C, to calculate the temperature change of the water:

4.2 kJ = (250 g) x (4.18 J/g°C) x ΔT

Solving for ΔT, we get:

ΔT = 4.2 kJ / (250 g x 4.18 J/g°C)

ΔT = 4.2°C

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Explanation:

From the balanced chemical equation, we see that 4 moles of FeS2 react with 11 moles of O2 to form 2 moles of Fe2O3.

So, for every 4 moles of FeS2, we get 2 moles of Fe2O3.

To find the moles of Fe2O3 formed from 14.56 moles of FeS2, we can use a proportion:

4 moles FeS2 / 2 moles Fe2O3 = 14.56 moles FeS2 / x moles Fe2O3

Cross-multiplying, we get:

4 moles FeS2 * x moles Fe2O3 = 2 moles Fe2O3 * 14.56 moles FeS2

Simplifying, we get:

x moles Fe2O3 = (2 moles Fe2O3 * 14.56 moles FeS2) / 4 moles FeS2

x moles Fe2O3 = 7.28 moles Fe2O3

Therefore, 7.28 moles of Fe2O3 will be formed when 14.56 moles of FeS2 reacts.

To obtain a Newman projection from a linear compound, first identify two adjacent carbon (C) atoms which will be the focus. A circle is to be drawn to represent the front C and a dot for the back C with lines radiating outward representing the other 3 groups. Further, check its orientation.

To obtain a Newman projection from a linear compound, please follow these steps:

1. Identify the two carbon atoms that will be the focus of the Newman projection. These are usually adjacent carbon atoms in the compound.

2. Align your line of sight so that you are looking directly down the bond connecting these two carbon atoms. This is the line of sight along which the Newman projection will be drawn.

3. Draw a circle to represent the front carbon atom. Place a dot in the center of the circle to represent the back carbon atom.

4. Identify the three groups attached to the front carbon atom, and draw them as lines radiating outward from the edge of the circle. Each line should be at a 120-degree angle from the others to represent the tetrahedral geometry of the carbon atom.

5. Identify the three groups attached to the back carbon atom, and draw them as lines radiating outward from the dot in the center of the circle. Again, use 120-degree angles between the lines.

6. Check the orientation of the groups on both carbon atoms to ensure that they are properly aligned according to the linear compound's structure.

By following these steps, you have now obtained a Newman projection for the linear compound.

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True in a galvanic cell, once electrons are produced at anode, they will move through the salt bridge towards the cathode half-cell.

In a galvanic cell, oxidation occurs at the anode, producing electrons. These electrons then move through the external circuit towards the cathode, where reduction occurs. However, since the two half-cells are physically separated by an electrolyte solution, a salt bridge is used to allow the flow of ions between the two compartments. This is necessary to maintain charge neutrality and prevent the buildup of excess charge in either half-cell. The movement of electrons through the external circuit and the movement of ions through the salt bridge are two separate processes that are necessary for the overall functioning of the galvanic cell.

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The molar entropy of a substance increases with increasing temperature.

Entropy is a measure of the disorder or randomness of a system. At higher temperatures, the molecules of a substance have more kinetic energy and move more rapidly. This increased motion leads to more disorder, which results in an increase in the molar entropy of the substance. Therefore, as the temperature of a substance increases, its molar entropy also increases.

As the temperature of a substance increases, the molecules within the substance gain more kinetic energy, causing them to move more rapidly and randomly. This increase in molecular motion leads to a higher degree of molecular disorder, which is directly related to the molar entropy of the substance. Therefore, as the temperature rises, the molar entropy of the substance also increases.

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The statement that describes limitation of interactive is "The interactive assumes that the temperature of a solid can be easily measured using temperature probe". So, option (b) is right one.

Molecular interactions occur between molecules or atoms that are not bound by bonds. Molecular interactions include cohesion (attraction forces between species), adhesion forces (attraction forces between different species), and forces between molecules. The temperature measured by calorimeter is used to determine the heat transfer from the process under study. Interactions working on interactive assume that the temperature of objects can be easily measured using a thermometer. Therefore, option(b) is correct choice for answer.

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B. Zn  element is associated with the term "galvanized"

Galvanization refers to the process of coating iron or steel with a layer of zinc to prevent rusting. Zinc is commonly used for this purpose because it is highly resistant to corrosion and has a low potential for oxidation. Explanation: Galvanized steel is widely used in construction, automotive, and other industries due to its durability and strength.

The process of galvanization involves immersing the steel in a bath of molten zinc or applying a layer of zinc through electroplating. This creates a protective layer on the steel, which helps to prevent rusting and corrosion. Zinc is also used in the production of many other products, including batteries, alloys, and pigments.

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There are 8 corner atoms shown in the image. Each corner atom contributes 1/8th of its volume to the boundaries of the cell, as it is shared equally among 8 unit cells that share the corner.

Therefore, 1/8th of each corner atom is inside the boundaries of the cell. In terms of the fraction of the corner atom's surface area that is inside the cell, this depends on the specific shape and orientation of the unit cell. However, regardless of the shape and orientation of the cell, each corner atom will contribute 1/4th of its surface area to the boundaries of the cell, as it is shared equally among 4 adjacent faces of the cell that meet at the corner.

A unit cell is the smallest repeating unit in a crystal structure, and its corners are occupied by atoms. Depending on the type of unit cell (simple cubic, body-centered cubic, or face-centered cubic), the number of corner atoms can vary.

In a simple cubic unit cell, there are 8 corner atoms. For the other two types, there are still 8 corner atoms, but additional atoms may be present at other locations in the unit cell.

Regarding the fraction of each corner atom inside the unit cell boundaries, it is important to understand that corner atoms are shared by adjacent unit cells. In a cubic unit cell, each corner atom is shared by 8 unit cells, meaning that only 1/8th of a corner atom is present within a single unit cell.

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Answer:

Density = mass /volume

Thus,

2.56÷0.820= 3.12195Kg/L

The statement "chemical reactions with free energy changes close to zero are at equilibrium and regulated by the concentration of products and reactants" is true because the rate of the forward reaction equals the rate of the reverse reaction.

When a reaction reaches equilibrium, the rate of the forward reaction equals the rate of the reverse reaction, and there is no net change in the concentration of products and reactants. The free energy change (ΔG) at equilibrium is zero, indicating that the system is in a stable state.

The relationship between free energy, equilibrium, and concentrations can be explained by the Gibbs free energy equation: ΔG = ΔG° + RT ln(Q), where ΔG° is the standard free energy change, R is the gas constant, T is the temperature, and Q is the reaction quotient. When ΔG = 0, the reaction is at equilibrium, and Q = K, the equilibrium constant.

The equilibrium constant K is determined by the ratio of the concentrations of products to reactants, raised to the power of their respective stoichiometric coefficients. This means that the position of equilibrium depends on the concentrations of both products and reactants. If either the product or reactant concentrations change, the system will adjust to reach a new equilibrium point, following Le Chatelier's principle.

In summary, chemical reactions with free energy changes close to zero are at equilibrium and regulated by the concentration of products and reactants. The position of equilibrium depends on these concentrations, and the system adjusts accordingly to maintain equilibrium when these concentrations change.

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The most likely true statement about the mechanical behavior of an hcp metal versus a bcc metal is that the hcp metal is likely more ductile than the bcc metal because its slip planes are close-packed while the bcc metal's slip planes are not.

This is because close-packed slip planes allow for easier movement of dislocations, which results in higher ductility. However, it is important to note that the mechanical behavior of metals is dependent on many factors such as temperature, stress, and strain rate, and so this statement may not always hold true.
In general, ductility is influenced by the number of available slip systems in a metal's crystal structure. BCC metals tend to have more intersecting slip systems, which allow for more deformation before failure, resulting in higher ductility. On the other hand, HCP metals usually have fewer slip systems and thus tend to be less ductile.

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