What volume in

L

of a 0. 724 M Nal solution contains 0. 405 mol of Nal ?

The solubility of \(\\M(OH)_2}\) in a buffered solution is calculated to be 7.0 × \(10^{-2}\) at pH 7.0, 5.8 x \(10 ^{-6}\) M at pH 10.0, and 0.17 M at pH 14.0.

A substance's solubility refers to its capacity to dissolve in a solvent and condense into a homogenous solution. Temperature, pressure, and the chemical makeup of the solvent and solute all affect how soluble a material is. For instance, whereas sugar is insoluble in oil or petrol, it is soluble in water. In contrast, oil is insoluble in water but is soluble in petrol. The greatest quantity of solute that may dissolve in a given amount of solvent at a specific temperature and pressure is used to determine a substance's solubility.

Kw = [\(H^+\)][\(OH^{-}\)]

At pH 7.0, [\(H^+\)] = 1.0 x \(10^{-7}\)

[\(OH^-\)] = 1.0 x \(10^{-7}\) M.

Kw = 1.0 x \(10^-14\)

[\(OH^-\)] = Kw/[\(H^+\)]

          = 1.0 x \(10^{-7}\) M.

At pH 10.0, [\(H^+\)] = 1.0 x \(10^{-10}\) M

[\(OH^-\)] = 1.0 x\(10^-4\)M

Kw = \(1.0 x 10^{-14 }\)

[\(OH^-\)] = Kw/[\(H^+\)]

         = 1.0 x \(10^{-4}\) M.

At pH 14.0, [\(H^+\)] = 1.0 x\(10^{-14}\) M

[\(OH^-\)] = 1.0 M

Kw = 1.0 x \(10^{-14}\)

[\(OH^-\)] = Kw/[\(H^+\)]

          = 1.0 M.

Ksp = [\(M^{2+}\)]\([OH^-]^2\)\([OH^-]^2\)

7.0 x \(10^{-16 }\)= [\(M^{2+}\)]\([1.0 * 10^{-7}]^2\)

[\(M^{2+}\)] = 7.0 x \(10^{-2}\) M

Kf = \([M(OH)_4]^{2-}\)/\(([M^{2+}][O]^2)\)

0.03 = \([M(OH)_4]^{2-}/([M^{2+}][1.0 x 10^-4]^2)\)

[\(M^{2+}\)] =\(5.8 * 10^{-6 }\)M

Kf =\([M(OH)_4]^{2-}/([M^{2+}][OH^-]^2)\)

\(0.03 = [M(OH)_4]^{2-}/([M(OH)_4]^{2-}x [1.0]^2)\)

\([M(OH)_4]^{2-} = 0.17 M\)

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6.9×10^23 molecules of oxygen are produced when 43g of h2o decompose.

2H20⇆O2+2H2

given mass,H2O=43 g

molar mass H2O=18 g

moles=given mass/molar mass

moles=43/18

moles=2.3 mol

molecules of oxygen= 2.3/2=1.15 mol

molecules of oxygen=1.15 mol×6.022×10^23

molecules of oxygen=6.9×10^23 molecules.

The non-metallic chemical element oxygen is found in Group 16 of the periodic table, generally known as the oxygen group (O). All living creatures require the colorless, tasteless, and odorless gas known as oxygen. When plants use it as a source of carbon and release the oxygen back into the environment, plants utilise the carbon dioxide that animals have taken up and converted it into.

Oxygen may react with almost every other element to form compounds in addition to reactions that remove elements from their combinations with one another. Combustions are the name for these reactions, which are typically accompanied by the creation of heat and light. The most important component is water.

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Not counting roadsides, the majority of turfgrass acreage in the U.S. is in non-rural areas is a true statement.

Turfgrass provides beautiful green areas within our urban and suburban landscapes. Turfgrasses have been maintained by humans to enhance their environment for more than 10 centuries. The complexity and comprehensiveness of the environmental benefits of turfgrass that improves our quality of life are just now being documented through research.

The crown is the lifeblood of the turf, producing new tillers, stems (rhizomes, stolons) and adventitious roots. Through the emergence of these structures, you can think of the crown as the heart of the turfgrass plant.

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Answer:

The temperature to the nearest 0.5°C is 98.5°C

The relationship between acceleration due to gravity (g), mass of earth (M) and the radius of earth (R) is \(g = \frac{GM}{R^2} \).

The weight of an object is determined as the product of the object's mass and acceleration due to gravity.

F = mg

The gravitational force between two objects in the universe is directly proportional to the product of mass of the objects and inversely proportional to the square of the distance between the objects.

\(F = \frac{GmM}{R^2} \)

\(mg = \frac{GmM}{R^2} \\\\ g = \frac{GM}{R^2} \)

where;

M is the mass of the earth

R is the radius of the earth

Thus, the relationship between acceleration due to gravity (g), mass of earth (M) and the radius of earth (R) is \(g = \frac{GM}{R^2} \).

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Answer:

When we kick the ball, the force we apply to it causes it to accelerate from a speed of 0 to a speed of dozens of kilometers per hour. When the ball is released from the foot, it begins to decelerate (negative acceleration) due to the force of friction that is exerted upon it (as we observed in the previous example).

Explanation:

We are aware that one Avogadro constant (N a=6.022*1023; Na =6.022*1023 ) equals one mole of any substance. Since MM=197 g/mol --> n= 8.87 g/197 g/mol 0.450*10-2 mol in this instance.

Determine the substance's molecular weight in units of one mole, then divide the molar mass value by the molecular mass, and multiply the result by the Avogadro constant to get the required number of molecules.

Auric chloride (AuCl3) and chloroauric acid are the most prevalent gold compounds (HAuCl4). Aqua regia is a solution made by combining one component of nitric acid with three parts of hydrochloric acid (because it dissolved gold, the King of Metals).

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Answer:

6 Cl atoms

Explanation:

In one molecule of ZnCl2, we have 2 atoms of Cl

Therefore, in 3 molecules of ZnCl2, we'll have 3(2) atoms of Cl = 6 atoms of Cl.

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The nucleus of an atom is small compared to the size of the atom because of Rutherford's nuclear theory. Rutherford's nuclear theory states that most of the mass of an atom and all of its positive charge are contained in a small core called the nucleus.

This statement is consistent with the fact that the nucleus of an atom is small compared to the size of the atom. Rutherford's nuclear theory states that the nucleus of an atom is small compared to the size of the atom, and, therefore, the nucleus has a relatively low mass compared to the mass of an atom.

Rutherford's nuclear theory states that the nucleus is small but contains about half of the mass of an atom. The nuclear theory was discovered by Ernest Rutherford in 1911.

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0.24 g of LiOH are needed to make 100 ml of a 0.1 m solution.

Lithium hydroxide (LiOH), commonly obtained by the reaction of lithium carbonate with lime, is used in making lithium salts (soaps) of stearic and other fatty acids; these soaps are widely used as thickeners in lubricating greases.

Lithium hydroxide is an inorganic compound with the formula LiOH. It can exist as anhydrous or hydrated, and both forms are white hygroscopic solids. They are soluble in water and slightly soluble in ethanol. Both are available commercially.

LiOH (Lithium hydroxide) is a base. It is because it releases OH– (hydroxide-ion) in water. According to theories, a substance that can accept a proton or donate electrons or react with acid is classified as a base. LiOH reacts with strong acid HCl that produce LiCl and water.

The molarity of LiOH is 0.1M

The given volume is,

M = W1 × 1000/m1 × V(ml)

m1 = molecular mass of LiOH = 24

putting the values in the previous equation,

0.1 = W1 × 1000/24 × 100

W1 = 0.1 × 24 ×100/1000

⇒ 0.24 grams of LiOH is required.

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Answer:

nobel gases

Explanation:

nobel gases elements in the periodic table are least likely to combine with other elements

The result of the exponential function 2(2)+1/2^17203 is 4.

Power operation or an exponent function is a positive or negative number placed above and to the right of a quantity.

The given exponential function can be calculated as follows;

2(2) + 1/2^(17203)

first solve for 2(2);

2(2) = 2 x 2 = 4

second solve for 1/2^(17203);

1/2^(17203) ≈ 0

Add first solution and second solution together;

4 + 0 = 4

Thus, the result of the exponential function 2(2)+1/2^17203 is 4.

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A conductor is a material that allows electric charge to pass through it easily. Some conductors conduct electricity better than others. The answer is option B, Graphite.

The measure of a material's ability to conduct electricity is called its electrical conductivity. A material with a high electrical conductivity will conduct electricity more readily than a material with a low electrical conductivity. Graphite is a good conductor of electricity. It has a high electrical conductivity due to the presence of delocalized electrons in its structure. Graphite is a form of carbon and its electrical conductivity comes from the fact that it has a free electron in each of its three covalent bonds. These electrons are free to move throughout the graphite structure, allowing electricity to pass through it easily. Diamond, Lamp black, and Charcoal are not good conductors of electricity. The answer is option B, Graphite.

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Answer:

It is made up of 2 elements. The elements are calcium and chlorine.

Explanation:

I just know

The magnesium is the anode of a magnesium and zinc galvanic cell.

The magnesium is the anode means the site of oxidation, where magnesium ions flow into solution. Here the electrons leave the electrode and flow through the voltmeter as they move to the zinc cathode.

While on the other hand, zinc is the cathode i.e. the site of reduction, where zinc ions flow onto the electrode in order to pick up electrons so we can conclude that magnesium is the anode of a magnesium and zinc galvanic cell.

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Answer:ANSWER IS MG(s)

Explanation:

Answer:

Chromium, calcium, and osmium

Explanation:

These elements are metals, considering this, these elements electron shells(orbitals) are further away from the nucleus, with this, their attractions are not as strong as non-metals, so some of their electrons are able to move freely.

When you accumulate many atoms, these metals can form a "sea of electrons"  because they all have loose electrons interacting with each other. This allows easy conduction of heat and electricity.

Answer:

Chromium

Calcium

Osmium

Explanation:

The elements likely conduct electricity well are chromium, calcium and osmium. As these are metals and are observed to be good conductors of heat and electricity. They have extra electrons to donate and hence flow of electrons cause them to be a good conductor of electricity. Rest iodine is a non-metals which is not good conductors of electricity. Carbon is not itself a good conductor but one of its allotrope which is graphite is a good conductor of electricity.

A mixed inhibitor that has a higher affinity for the enzyme compared to the substrate can affect the Michaelis-Menten constant (Km) in enzyme kinetics by increasing the value of Km.

Km is a measure of the substrate concentration required for half-maximal velocity and is a key parameter in describing enzyme catalysis. However, In the presence of a mixed inhibitor, the inhibitor molecule can bind to both the free enzyme and the enzyme-substrate complex with different affinities.

The binding of the inhibitor to the free enzyme reduces the number of active enzyme molecules available for catalysis while binding to the enzyme-substrate complex slows down the catalytic reaction. This leads to a reduction in the effective concentration of the enzyme-substrate complex, which in turn increases the apparent Km value.

In other words, the higher affinity of the mixed inhibitor for the enzyme reduces the efficiency of the enzyme-substrate complex formation, making it more difficult for the substrate to bind to the enzyme, hence increasing the value of Km. Therefore, a mixed inhibitor that has a higher affinity for the enzyme compared to the substrate can cause a decrease in the efficiency of enzyme catalysis, which is reflected in the increase in Km.

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The empirical formula of copper oxide can be determined by conducting an experiment to find the ratio of copper and oxygen atoms.

To determine the empirical formula of copper oxide, an experiment is conducted to find the ratio of copper and oxygen atoms in the compound. The process involves decomposing a known mass of copper oxide to separate the copper and oxygen components. The masses of copper and oxygen are then measured.

By comparing the masses, the ratio between copper and oxygen can be determined. This ratio represents the relative number of atoms of each element in the compound. The empirical formula expresses this ratio in its simplest form, indicating the smallest whole-number ratio of atoms present.

For example, if the experiment shows that there are 2 moles of copper for every 1 mole of oxygen, the empirical formula would be Cu2O. This means that in copper oxide, there are two copper atoms for every one oxygen atom.

By conducting experiments and calculating the ratio of copper and oxygen, the empirical formula of copper oxide can be obtained, providing valuable information about the composition and structure of the compound.

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Answer:

City B has the larger annual temperature range

Explanation:

This is correct option because generally the northern side of the equator is high in temperature than the southern hemisphere part.

Since the southern side of the equator or Southern Hemisphere, where city A resides will generally have higher altitude or rise, so this creates higher average temperature.

Answer:

False

Explanation:

Scientifically, energy can never be created or destroyed. However it can be transfered. This law is called The Law of Conservation of Energy.

Answer:

Mg(OH)2

Explanation:

Magnesium hydroxide is the base since it has hydroxyl ions.

Mg(OH)₂ is the base in this acid-base reaction.

This can be defined as a chemical substance which donates electrons, accepts protons, or releases hydroxide (OH-) ions in aqueous solution.

Mg(OH)₂ has the presence of hydroxide (OH-) ions in its compound which was why it was chosen as the most appropriate choice.

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The water changes from the gas to the liquid through the process of the condensation.

The Condensation is the process where the water vapor becomes the liquid. It is the reverse of the evaporation, where the liquid water becomes the vapor. The Condensation happens one of the two ways: The first is either the air will cooled to its the dew point or it will becomes so saturated with the water vapor that it cannot be hold any of the more water.

Thus, the condensation is the process in which the  water changes from the gas phase to the liquid phase.

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Answer:

9 grams

Explanation:

Assuming that HCl is excess

moles of the reactant aluminum = 81/27 = 3 moles

By organizing the given data with ratios:

     2AI     +   6HCI  -->  2AICI3 +   3H2

       (2)      :      6       :       2        :      3

       (3)       :       --      :        --       :      ?    

Part value = 3/2 = 1.5

yielded moles of H2 = 1.5 * 3 = 4.5 moles

mass produced of H2 = 4.5 * 2 = 9 grams

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The temperature range for which this reaction is spontaneous is 5191.76°C.

To determine the temperature range for which this reaction is spontaneous, we can use the Gibbs free energy equation:
ΔG = ΔH - TΔS

where ΔG is the change in Gibbs free energy, ΔH is the change in enthalpy, ΔS is the change in entropy, and T is the temperature in Kelvin.

For a spontaneous reaction, ΔG must be negative. We know that ΔH = -623 kJ/mol and ΔS = -114 J/mol-K. We need to convert ΔH to J/mol, so we have:
ΔH = -623,000 J/mol

Substituting the values into the equation and solving for T, we get:
ΔG = ΔH - TΔS
-ΔG = TΔS - ΔH
T = (-ΔH) / ΔS
T = (-623,000 J/mol) / (-114 J/mol-K)
T = 5464.91 K

However, this temperature is far above normal laboratory conditions, so we need to convert it to Celsius.
T (°C) = T (K) - 273.15
T (°C) = 5464.91 K - 273.15
T (°C) = 5191.76°C

This temperature is unrealistic for this reaction, so we can conclude that this reaction is spontaneous at very high temperatures. In general, a reaction is spontaneous at high temperatures if the ΔH is negative and the ΔS is positive.

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4.64 is the equilibrium pOH of a 1.0 M solution of formic acid (HCO2H) if Ka=1.8×10⁻⁴ .

A standard for determining the concentration of hydroxide ions in a solution is called pOH, or potential of hydroxide. It is employed to ascertain if a solution is acidic or alkaline. The hydroxide ion (OH -) concentration's negative logarithm, or pOH, is equivalent.

The ion of hydroxide (OH -) content is measured by pOH. It is a way to describe how alkaline a solution is. At 25 degrees Celsius, aqueous solutions with pOH values of 7 or less are neutral, whereas those with pOH values of 7 or more are acidic.

                                       HCOO⁻ + H₂O   ⇄   HCOOH + OH⁻

At t=0                              1.0                          -              -

At t =equilibrium           (1.0-x)                          x           x    

Ka=[ HCOOH][ OH-]/HCOO-

1.8×10⁻⁴ = X²/  (1.0-x)          

x=0.44×10⁻⁵  

pOH = -log[OH⁻] = -log(0.44×10⁻⁵) = 4.64

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Answer:

Because they have different boiling temperatures, they can be separated easily by a process called fractional distillation. ... There is a temperature difference across the column (hot at the bottom, cool at the top). The vapor rises in the column. As the vapor rises through the trays in the column, it cools.

The feedback will depend on the specific configuration entered by the user. However, if the correct electron configuration for argon is entered (1s2 2s2 2p6 3s2 3p6), and then the user clicks on the first 3d orbital for potassium, the feedback should indicate that this is an incorrect configuration because potassium's electrons first fill the 4s orbital before occupying the 3d orbitals.

As per the question given,  

What exactly is feedback?

Feedback happens when a system's outputs are routed back as inputs as part of a cause-and-effect chain that creates a circuit or loop. The system is said to feed back onto itself.

What exactly do you mean by configuration?

In general, a configuration is the arrangement - or the act of arranging - of the pieces that comprise a whole.

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Answer:OH^- ion

Explanation: When LiOH added in water then LiOH dissociated in Li+ and OH- . Water is a composition of H+ and OH- ions hence concentration of OH- ions will be increased after adding LiOH.