would a mix of ki and na2so3 perform the same reduction and precipitation of copper(ii) as a mix of nai and na2so3 ?

In a sample of pure cobalt (Co), the type of bonding that occurs is metallic bonding. This bond forms a strong, stable structure, creating a lattice of metal atoms in which the electrons are free to move throughout the entire solid. The correct option is b.

Metallic bonding is the result of the attraction between positively charged metal ions and the delocalized electrons that surround them.

In metallic bonding, the metal atoms lose their outermost electrons, forming positively charged metal cations. The lost electrons become delocalized and are free to move, creating a "sea of electrons." This electron mobility is responsible for the electrical and thermal conductivity of metals.

In the case of cobalt, each cobalt atom shares its valence electrons with neighboring atoms, resulting in a strong bond between the cobalt atoms. This bond provides cobalt with its characteristic metallic properties, such as high melting and boiling points, malleability, and ductility.

To summarize, in a sample of pure cobalt, the type of bonding that occurs is metallic bonding, as one cobalt atom is held to another cobalt atom through the sharing of delocalized electrons, which forms a strong and stable structure.

Hence, b. metallic is the correct option.

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Environmental modifications can be considered "any equipment that changes the environment for everyone who shares space with the patient" (Dutton, 1995, p178).

These modifications aim to provide access, promote independence, safety, energy conservation, work simplification, and joint protection. Some examples of environmental modifications include:

1. Fixed toilet frames: These provide support for individuals who have difficulty sitting or standing when using the toilet.
2. Raised toilet seats: These make it easier for individuals with limited mobility to sit down and stand up from the toilet.
3. Grab rails: Installed near stairs, in bathrooms, or other areas where extra support is needed, grab rails help individuals maintain their balance and prevent falls.
4. Car adaptations: These can include hand controls, wheelchair lifts, and other modifications that make it easier for individuals with disabilities to operate or access a vehicle.
5. Ramps: Ramps provide a gradual incline, allowing wheelchair users and others with mobility impairments to access buildings and other areas with elevation changes.
6. Widening doorways: By increasing the width of doorways, individuals using wheelchairs, walkers, or other mobility aids can easily pass through.
7. Walk-in showers: These showers have a low or no threshold, making it easier for individuals with mobility impairments to enter and exit the shower area.

These are just a few examples of environmental modifications that can improve the quality of life for individuals with various physical limitations and disabilities.

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An important fact about resonance structures and the nuclei is that the positions of the nuclei remain the same in all resonance structures of a molecule.

In the resonance structures depict the delocalization of electrons within a molecule, while the positions of the nuclei remain unchanged. This means that the nuclei stay in place, and only the electron distribution changes among the different resonance structures, resulting in an average or hybrid electron configuration that contributes to the overall stability of the molecule.

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The given structure is of formaldehyde an organic compound and it is acidic in nature.

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To determine the final temperature of sand when 300 calories of heat is added to 100 grams of sand at an initial temperature of 20°C, we need to know the specific heat capacity of sand. The specific heat capacity is the amount of heat energy required to raise the temperature of a certain amount of a substance by 1 degree Celsius.

The final temperature of the sand will be 20°C + 0.16°C = 20.16°C.

we need to use the equation: Q = mcΔT

Where Q is the heat energy transferred, m is the mass of the object (in this case, the sand), c is the specific heat capacity of the object (which tells us how much energy is needed to raise the temperature of 1 gram of the object by 1 degree Celsius), and ΔT is the change in temperature.

First, let's calculate the heat energy transferred:

Q = 300 cal

Next, let's determine the specific heat capacity of sand. The specific heat capacity of sand varies depending on the type of sand, but let's assume it is around 0.19 J/g°C.

Now we can use the equation to solve for ΔT:

300 cal = 100 g x 0.19 J/g°C x ΔT

Simplifying:

300 cal = 19 J/g°C x 100 g x ΔT

ΔT = 300 cal / (19 J/g°C x 100 g)

ΔT = 0.16°C

Therefore, the final temperature of the sand will be 20°C + 0.16°C = 20.16°C.

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Answer:

The electrophilic chlorination of aromatic compounds usually occurs with Cl2 and AlCl3 as the reaction conditions, where AlCl3 serves as a catalyst.

Explanation:

The technology that describes how super-resolution imaging can track a single molecule inside of a cell, even though the resolution limit of light is much larger than the molecule being tracked is fluorescent em. The correct option is D.

A fluorescent microscopy is a powerful tool for imaging biological samples. However, the diffraction limit of light makes it difficult to resolve individual molecules or structures that are smaller than the wavelength of light.

Super-resolution microscopy overcomes this limit by using various techniques to enhance the resolution of the images beyond the diffraction limit of light.

One such technique is single-molecule localization microscopy, which uses fluorescent probes to track individual molecules.

By carefully analyzing the emitted fluorescent signals, it is possible to precisely locate the position of the individual molecules, even if they are smaller than the diffraction limit of light.

This can be achieved by computing the central peak position based on the intensity profile, which allows for the tracking of a single molecule inside a cell with high spatial resolution.

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Alcohols are highly soluble in water primarily due to their polar nature and hydrogen bonding capabilities. The alcohol molecule contains a hydroxyl group (OH) attached to a carbon chain, which contributes to its polarity. This polar nature allows alcohols to form hydrogen bonds with water molecules, enhancing solubility.

Water is a polar solvent, meaning it has regions of positive and negative charges. These charges allow it to form hydrogen bonds with other polar molecules like alcohols. When alcohol is mixed with water, the hydrogen of the hydroxyl group in alcohol can form hydrogen bonds with the oxygen of water molecules, while the oxygen in the hydroxyl group can form hydrogen bonds with the hydrogen of water molecules.

This intermolecular attraction between alcohol and water molecules facilitates the mixing and dissolution of the two substances, resulting in high solubility. Moreover, shorter-chain alcohols, such as methanol and ethanol, have higher solubility in water compared to longer-chain alcohols. This is because the nonpolar carbon chain increases in size, reducing the overall polarity of the alcohol molecule and its ability to form hydrogen bonds with water.

In summary, the high solubility of most alcohols in water can be attributed to their polar nature, which allows them to form hydrogen bonds with water molecules. This interaction leads to effective mixing and dissolution of the two substances.

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There are 0.359 moles of Be in the thin-foil window. To determine the number of moles of Beryllium (Be) in a thin-foil window weighing 3.24 g, we need to use the molar mass of Be, which is 9.012 g/mol.

First, we need to calculate the number of moles of Be in 3.24 g by dividing the weight by the molar mass:

3.24 g ÷ 9.012 g/mol = 0.359 moles of Be

Therefore, there are 0.359 moles of Be in the thin-foil window.

Beryllium is commonly used in X-ray windows for its transparency to X-rays and high melting point. This makes it ideal for medical imaging instruments as it allows the X-rays to pass through the window and reach the imaging sensor, while also being able to withstand the high temperatures generated by the X-ray equipment.

However, beryllium is a toxic metal and requires special handling and disposal procedures to ensure the safety of workers and the environment.

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a. The entropy change (∆S) for this reaction will be negative.

b. The entropy change for this reaction will also be negative.

c. In this reaction, the entropy change will likely be positive.

d. The entropy change for this reaction is expected to be positive.

a. PCl3(g) + Cl2(g) → PCl5(g): The entropy change (∆S) for this reaction will be negative, as the number of gaseous molecules decreases from two reactants to one product, indicating a decrease in disorder.

b. SO2(g) + CaO(s) → CaSO3(s): The entropy change for this reaction will also be negative. The gaseous SO2 molecule is becoming a part of the solid product, leading to a decrease in the system's overall disorder.

c. CO2(g) + H2O(l) → H2CO3(aq): In this reaction, the entropy change will likely be positive. Although CO2 gas is becoming a part of the aqueous product, the increase in the number of solute particles in the solution contributes to an increase in disorder.

d. Ni(s) + 2HCl(aq) → H2(g) + NiCl2(aq): The entropy change for this reaction is expected to be positive. The solid Ni is replaced by the gaseous H2, which increases the disorder in the system. Additionally, the number of solute particles in the solution increases, contributing to the positive entropy change.

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Phenols, thiophenols, and alkylbenzenes all share a common structural feature: the presence of an aromatic benzene ring. Specifically, they all contain a benzene ring with various substituents attached to it.

Phenols have a hydroxyl (-OH) group attached to the ring, thiophenols have a sulfur (S) atom attached to the ring, and alkylbenzenes have one or more alkyl groups (such as methyl, ethyl, or propyl) attached to the ring.

Despite their different substituents, all three types of compounds have the same basic ring structure, which is responsible for their unique properties and reactivities.

What is thiophenol ?

Thiophenol, is an organic compound with the chemical formula C6H5SH. It is a clear to yellowish liquid with a strong odor, similar to that of garlic. Thiophenol is used in various applications, including as a building block for organic synthesis and as a stabilizer for polymers. It is also a precursor for the production of fungicides and insecticides.

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If the Gibbs free energy change (∆G°) for a reaction is zero, it means that the reaction is in a state of equilibrium, where the forward and reverse reactions are occurring at equal rates.

The equilibrium constant (K) for a chemical reaction is related to the Gibbs free energy change (∆G°) of the reaction through the equation:

∆G° = -RT ln(K)

where R is the gas constant, T is the temperature in Kelvin, and ln is the natural logarithm.

If ∆G° = 0, then:

0 = -RT ln(K)

which means that ln(K) = 0, or K = 1. Therefore, the value of the equilibrium constant for a reaction at equilibrium with ∆G° = 0 is 1.

If we begin the reaction with pure products, the reaction will proceed in the reverse direction until equilibrium is reached, according to Le Chatelier's principle. This means that the concentration of the products will decrease and the concentration of the reactants will increase until the equilibrium constant is reached, which is 1 in this case.

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Producing electrical energy once again and the direction of the reaction is reversed, and the nickel hydroxide is oxidized while the cadmium is reduced.

A Nickel Cadmium [tex](NiCad)[/tex] battery undergoes a redox reaction during the discharge process.

During the discharge of a [tex]NiCad[/tex] battery, the anode (negative electrode) is made of cadmium, and the cathode (positive electrode) is made of nickel hydroxide. The electrolyte is typically a solution of potassium hydroxide [tex](KOH)[/tex].

The reaction at the anode can be represented as follows:

[tex]Cd + 2OH- → Cd(OH)2 + 2e-[/tex]

In this reaction, cadmium metal [tex](Cd)[/tex] is oxidized to cadmium hydroxide [tex](Cd(OH)2)[/tex] while releasing two electrons. The hydroxide ions [tex](OH-)[/tex] in the electrolyte act as the oxidizing agent.

At the cathode, nickel hydroxide [tex](Ni(OH)2)[/tex] is reduced to nickel oxyhydroxide [tex](NiOOH)[/tex] while absorbing two electrons, which can be represented as:

[tex]Ni(OH)2 + 2e- → NiOOH + H2O + OH-[/tex]

In this reaction, the nickel ions are reduced by gaining two electrons, and the hydroxide ions in the electrolyte act as a source of hydrogen ions [tex](H+)[/tex] and water [tex](H2O)[/tex].

The overall reaction for the discharge of a [tex]NiCad[/tex] battery can be summarized as:

[tex]Cd + Ni(OH)2 → Cd(OH)2 + NiOOH[/tex]

This reaction involves the transfer of electrons from cadmium at the anode to nickel hydroxide at the cathode. The electrical energy produced by this redox reaction is stored in the battery and can be used to power various devices.

The direction of the reaction is reversed, and the nickel hydroxide is oxidized while the cadmium is reduced, producing electrical energy once again.

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When ice partially melts, the resulting water has the same chemical composition as the ice because ice is a pure substance. However, when rocks partially melt, the resulting magma is not a pure substance, but rather a mixture of various minerals that have different melting points.

As the rock begins to melt, the minerals with the lowest melting points will melt first, leading to a change in the chemical composition of the remaining solid rock. This change in composition can result in the production of magma with a different composition than the source rock.

Additionally, the process of partial melting can also cause the separation of different minerals within the source rock, further altering the composition of the resulting magma. Therefore, while partial melting of ice and rocks both involve melting a substance, the resulting products can have vastly different compositions due to differences in the nature of the substances being melted.

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We need 26.0 mL of the stock solution to make 200.0 mL of a 0.10 M Na2CO3 solution.

A stock solution is a concentrated solution that is used to prepare solutions of lower concentrations for experimental use. A stock solution typically has a known concentration of a solute and is used as a starting point for making solutions of different concentrations, by dilution with a solvent such as water.

The preparation of a stock solution involves measuring a specific quantity of the solute and dissolving it in a specific volume of the solvent, often with the aid of volumetric glassware. The concentration of the stock solution is usually expressed in units of molarity (mol/L) or mass/volume (mg/mL).

To make a 0.10 M solution with a volume of 200.0 mL, we can use the formula:

M1V1 = M2V2

where M1 and V1 are the initial concentration and volume of the stock solution, and M2 and V2 are the desired concentration and volume of the final solution.

We know that V2 = 200.0 mL and M2 = 0.10 M. Let's first calculate the amount of Na2CO3 required to make the final solution:

n = MV = (0.10 mol/L) x (0.200 L) = 0.020 mol

Now, we need to find out how much of the stock solution is needed to make this final solution. Rearranging the equation above, we get:

V1 = (M2V2) / M1

Substituting the values we know, we get:

V1 = (0.10 mol/L x 0.200 L) / (0.76 mol/L) = 0.026 L or 26.0 mL

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Collagen where the proline is not hydroxylated is less stable compared to collagen where the proline is hydroxylated. Hydroxylation of proline is an important post-translational modification that increases the stability of the collagen triple helix.

This process involves the addition of a hydroxyl group to the proline residue, converting it into hydroxyproline. The presence of hydroxyproline increases hydrogen bonding within the collagen structure, thereby enhancing its stability and strength.

In contrast, the absence of hydroxylation in proline results in weaker hydrogen bonding and a less stable collagen structure. This makes non-hydroxylated collagen more susceptible to degradation and less capable of maintaining its structural integrity.

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Since we can only produce a maximum of 6 units of Y from the X, it is the limiting reactant. Therefore, the limiting reactant is B) X.

To determine the limiting reactant in the generic chemical equation 2W + 3X → 3Y + Z, follow these steps:

1. Calculate the ratio of available reactants to the required reactants in the equation. In this case, we have 5 units of W and 6 units of X. The ratio of available W to required W is 5/2, and the ratio of available X to required X is 6/3.

2. Determine which ratio is smaller. The W ratio is 5/2 = 2.5, and the X ratio is 6/3 = 2. The smaller ratio is for X.

3. The reactant with the smaller ratio is the limiting reactant, as it will be consumed first, preventing further reaction. In this case, the limiting reactant is X.

So, the correct answer is: B) X

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Answer: 0.756 moles

Explanation:

1 mole of NH2 has 6.022 x 10^23 molecules therefore:

(4.55x10^23)/(6.022x10^23)= 0.7555 moles or 0.756 using sig

The correct name for Br2O is bromine(I) oxide. This is because there are two bromine atoms and one oxygen atom in the compound. The correct option is C.

The Roman numeral I in parentheses indicates that bromine has a +1 oxidation state in this compound.

The other options are incorrect for various reasons.

Option A, bromine oxide, is not specific enough and could refer to several different compounds with varying ratios of bromine to oxygen.

Option B, dibromine monoxide, implies that there is only one oxygen atom, which is not the case.

Option D, bromine(II) oxide, implies that bromine has a +2 oxidation state, which is not the case in this compound.

Option E, bromate, refers to a different compound altogether, which has a different chemical formula and composition.

Therefore, the correct answer is C. bromine(I) oxide, which accurately reflects the composition and oxidation state of the elements in the compound.

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Now we have a whole number ratio of 3:4 between sulfur and iron. Therefore, the empirical formula of the sulfide of iron is [tex]Fe_3S_4[/tex].

To find the empirical formula of the sulfide of iron, we first need to determine the moles of sulfur and iron in the compound.

Moles of Sulfur = 1.926 g / 32.06 g/mol = 0.060 moles

Moles of Iron = 2.233 g / 55.85 g/mol = 0.040 moles

Next, we need to determine the smallest whole number ratio between the moles of sulfur and iron.

0.060 moles Sulfur / 0.040 moles Iron = 1.5

This ratio is not a whole number, so we need to multiply both the sulfur and iron moles by 2 to get a whole number ratio.

0.060 moles Sulfur x 2 = 0.120 moles Sulfur

0.040 moles Iron x 2 = 0.080 moles Iron

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Correct Question:

A sulfide of iron was formed by combining 1.926g of sulfur(S) with 2.233g of iron (Fe). What is the compound’s empirical formula?

What would be the solution of this?

A molecule with three bonded atoms and zero lone pairs has an electron domain geometry of trigonal planar.

The ideal bond angle for this geometry is 120 degrees.

The hybridization of the central atom in this molecule is sp2.

The given molecule has three bonded atoms and no lone pairs, meaning that it has a total of three electron domains. The ideal bond angle for a molecule with three electron domains is 120 degrees.

To determine the hybridization of the central atom, we need to first identify the type of atoms that are bonded to it. Without knowing the specific molecule, we cannot determine the hybridization.

Regarding the polarity of the molecule, it depends on the electronegativity difference between the central atom and the bonded atoms. If there is a significant difference in electronegativity, then the molecule will be polar. If the electronegativity difference is minimal, then the molecule will be nonpolar.

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The rate law for the proposed mechanism can be determined by examining the rate-determining step, which is the slowest step in the mechanism. In this case, the slowest step is step 1, which involves the collision of N2O and H2 to form N2 and H2O. Therefore, the rate law for the overall reaction can be written as:

Rate = k[N2O][H2]

where k is the rate constant and [N2O] and [H2] are the concentrations of the reactants.

It is important to note that the coefficients in the balanced equation do not necessarily correspond to the stoichiometric coefficients in the rate law. This is because the rate law depends on the specific mechanism of the reaction, which may involve multiple steps with different stoichiometries.

Additionally, the rate law only includes the reactants that are involved in the rate-determining step. In this case, N2 and H2O are not included in the rate law because they are not involved in the slowest step.

Overall, understanding the rate law for a reaction is important for predicting how changing the concentration of reactants will affect the rate of the reaction. It also provides insight into the specific mechanism of the reaction and how different steps may contribute to the overall rate.

According to the question  Draw a graduated cylinder with 33.6g of CuCl2 in it.

A cylinder is a three-dimensional shape with two circular ends and a curved side. It is one of the most basic shapes in geometry, and is found in many everyday items. Cylinders can be either solid or hollow, and can have any number of faces. The volume of a cylinder is calculated by multiplying its height by the area of its base. Cylinders can be used to store liquids and other objects, and are very useful in engineering and construction. Cylinders are also used in engines, for example, the cylinders of an automobile engine contain the pistons that drive the vehicle.

Step 2: Add enough water to the graduated cylinder to fill it to a desired volume

Step 3: Measure out 0.08330233 M of the CuCl2 solution in a separate container.

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d. 84% is the percent composition of Carbon, in, C₇H₁₆

% composition is quite straightforward. You can determine by mass how much of each element is contained in a compound using its percent composition. A chemical compound is created when two or more components are combined.

The hydrocarbon includes 80% carbon, which translates to 80% of the molar mass being made up of carbon. Consequently, the hydrocarbon has four carbon atoms.

The percent composition is calculated by multiplying the total mass or quantity of an element present in a molecule or compound by the molecular mass of the compound.

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From the calculations, we can see that both the flour and eggs can produce a maximum of 12 waffles, while the oil can only produce 8 waffles. Therefore, the limiting reactant is the oil.

To determine the limiting reactant when you have 6 cups of flour, 9 eggs, and 2 tbs of oil, you'll need to compare the amounts of each ingredient to the given recipe: 2 cups flour + 3 eggs + 1 tbs oil → 4 waffles.

1. Determine the number of waffle batches for each ingredient:
  - Flour: 6 cups / 2 cups per batch = 3 batches
  - Eggs: 9 eggs / 3 eggs per batch = 3 batches
  - Oil: 2 tbs / 1 tbs per batch = 2 batches

2. Find the smallest number of batches among the ingredients. In this case, it is 2 batches (from the oil).

3. Identify the ingredient corresponding to the smallest number of batches. In this case, it is oil.

Therefore, the limiting reactant is (C) oil.

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The description that fits best is: "an activated complex is an unstable combination of reactant species representing the highest energy state of a reaction system."

A brief-lived species called an activated complex, commonly referred to as a transition state, develops during a chemical process. It is a highly energetic intermediate state where the reactant molecules are momentarily linked in a manner distinct from that of the starting materials or the products.

The activated complex immediately disintegrates into the products or returns to the reactants due to its instability. The energy barrier that must be crossed in order for the reaction to take place is represented by the activation energy, which is needed to produce the activated complex.

The activated compound is not a catalyst and is not separated from the reactants by a distinct phase. It is merely a transient, highly energetic intermediate state that develops during a chemical process. It cannot be directly viewed, but its presence can be deduced from theoretical calculations or experimental findings.

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The pressure of all the gas pumped into  an 80 L tank is 295.98 KPa in an Air fills a room with a volume of 240.0 L. Atmospheric pressure is

740.0 torr.

According to Boyle's Law,

[tex]P_{1}V_{1} = P_{2}V_{2}[/tex]

Substituting the value in the above equation

740×240= [tex]P_{2}[/tex] × 80

[tex]P_{2}[/tex]= [tex]\frac{740*240}{80}[/tex]

[tex]P_{2}[/tex] = 2220 torr

[tex]P_{2}[/tex] = 295.98 KPa

The relationship between pressure and volume of a confined gas is described by Boyle's law, often known as the Boyle-Mariotte law or Mariotte's law.

When the temperature is constant, [tex]P_{1}V_{1} = P_{2}V_{2}[/tex], according to Boyle's Law. The relationship between pressure and volume is also inverse, according to Boyle's Law. Accordingly, volume decreases as pressure rises and vice versa. [tex]PV=k[/tex] (k is the proportionality constant), according to Boyle's Law.

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According to valence bond theory, the hybridizations for the indicated atoms of acrylamide can be predicted by examining the atomic orbitals involved in the formation of the molecule.

Acrylamide (C3H5NO) contains carbon (C), hydrogen (H), nitrogen (N), and oxygen (O) atoms and there are two carbon atoms that form a double bond (C=C). Each of these carbon atoms undergoes sp2 hybridization, resulting in three sp2 hybrid orbitals that form sigma bonds with neighboring atoms. One of the carbon atoms is also bonded to a hydrogen atom, and the other is bonded to the amide group (-CONH2). The nitrogen atom in the amide group is sp3 hybridized, it forms three sigma bonds with two hydrogen atoms and the carbon atom, and has a lone pair in one of the sp3 hybrid orbitals.

The oxygen atom in the amide group is sp2 hybridized, forming two sigma bonds with the neighboring nitrogen and carbon atoms, and possessing a lone pair in one of its sp2 hybrid orbitals. In summary, according to valence bond theory, the hybridizations for the indicated atoms of acrylamide are as follows: the two carbon atoms in the double bond are sp2 hybridized, the nitrogen atom in the amide group is sp3 hybridized, and the oxygen atom in the amide group is sp2 hybridized. According to valence bond theory, the hybridizations for the indicated atoms of acrylamide can be predicted by examining the atomic orbitals involved in the formation of the molecule.

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To balance the half-reaction MnO4- → MnO2, 2 water molecules are needed, and they will appear as a product.

To identify the number of water molecules needed to balance the half-reaction [tex]MnO_{4} ^{-}[/tex] → [tex]MnO_{2}[/tex] and determine if water appears as a reactant or a product, follow these steps:

1. Balance the non-hydrogen and non-oxygen atoms first (in this case, manganese): [tex]MnO_{4} ^{-}[/tex] → [tex]MnO_{2}[/tex] is already balanced for manganese.
2. Balance the oxygen atoms by adding water molecules to the side that lacks oxygen. In this case, we need to add 2 water molecules to the right side (product side) of the equation: [tex]MnO_{4} ^{-}[/tex] → [tex]MnO_{2}[/tex] + 2[tex]H_{2}O[/tex]
3. Balance the hydrogen atoms by adding [tex]H^{+}[/tex] ions to the side that lacks hydrogen. In this case, we need to add 4[tex]H^{+}[/tex] ions to the left side (reactant side) of the equation: [tex]MnO_{4} ^{-}[/tex] + 4[tex]H^{+}[/tex] → [tex]MnO_{2}[/tex] + 2[tex]H_{2}O[/tex]

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The word equation that represents the violent reaction between sodium and water to produce sodium hydroxide and hydrogen gas is:

Sodium + Water → Sodium Hydroxide + Hydrogen

The reactants and products involved in a chemical reaction, as well as their relative amounts, are shown in a chemical equation which is a symbolic representation of the process.

Therefore, The hydrogen gas could ignite and burst as a result of this reaction's strong exothermicity and potential heat release. As a result, it's crucial to handle sodium with caution and carry out this response in a controlled setting.

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