similarity between your body’s muscle cell and blood cell.

Answer: Option (b) is the correct answer.

Explanation:

It is known that,

                   pH + pOH = 14

So, pOH = 14 - pH

As the given pH is 9.3. Hence, pOH for the given solution will be calculated as follows.

          pOH = 14 - 9.3

                   = 4.7

Therefore, pOH of the given solution is 4.7.

Answer:

The correct answer is - option B. salt and water are made of different atoms.

Explanation:

Water is made up of the hydrogen and oxygen atom with the ratio of 2:1 joined together with hydrogen bonds between hydrogen and oxygen which form.

NaCl or salt is a compound that is made up of a Na+ ( sodium ion) atom and Cl- (chlorine ion) atom with an ionic bond in between them forms a crystallized compound.

Thus, the correct answer is - option B. salt and water are made of different atoms.

The reason that atomic numbers are always integer values is because every element has a particular number of protons (option c).

Atomic number is defined as the number of protons present in the nucleus of an atom. Protons are positively charged particles, and their number determines the identity of the element. Since protons cannot be split into smaller particles, the atomic number is always a whole number.

This is in contrast to atomic mass, which takes into account both protons and neutrons and can result in non-integer values due to isotopes. The number of electrons in a neutral atom is equal to the number of protons, but it is the protons that define the atomic number. Hence, c is the correct option.

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The hydride ion is a stronger base than the alkoxide ion due to its smaller size and higher electronegativity. After the initial reaction with NaBH4.

the workup steps are designed to neutralize the remaining reagents and separate the desired product from any impurities or byproducts. For example, in a typical reduction reaction with NaBH4, the reaction mixture is quenched with an acidic workup solution, such as HCl or acetic acid, which protonates any remaining NaBH4 or intermediate species and hydrolyzes any unreacted starting material or byproducts. The resulting mixture is then extracted with an organic solvent, such as diethyl ether or dichloromethane, to isolate the desired product. Finally, the organic layer is dried over anhydrous salts, such as sodium sulfate or magnesium sulfate, to remove any residual water or solvent before the product is purified by distillation, chromatography, or recrystallization.

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Answer:

9.8 m/s2

Explanation:

That is to say, the acceleration of gravity on the surface of the earth at sea level is 9.8 m/s2.

Solar and wind technologies are location specific is the reason why nuclear power is important. Therefore, the correct option is option D.

Nuclear power is the term used to describe the controlled nuclear reactions used to produce energy. It uses radioactive substances, usually uranium, to create heat and steam that powers turbines to create electricity. Nuclear power, although being a contentious subject, offers several benefits that make it a crucial component of the world's energy mix. The effectiveness and sustainability of nuclear power are highlighted in this article's discussion of some significant topics.

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A solution is prepared by dissolving 1.0 g of NaOH in a total of 250 mL of solution. Then 10.0 mL of this solution is withdrawn and added to 90.0 mL of water. The pH of the final solution is 11. Here option D is the correct answer.

To determine the pH of the final solution, we need to calculate the concentration of hydroxide ions (OH-) first.

1.0 g of NaOH is dissolved in a total volume of 250 mL of solution, which is equivalent to 0.004 moles of NaOH (since the molar mass of NaOH is 40.0 g/mol). Therefore, the concentration of NaOH in the original solution is:

c(NaOH) = 0.004 moles / 0.250 L

= 0.016 M

When 10.0 mL of this solution is added to 90.0 mL of water, the resulting concentration of NaOH is diluted by a factor of 10. Therefore, the concentration of NaOH in the final solution is:

c(NaOH) = 0.016 M / 10

= 0.0016 M

Since NaOH is a strong base, it completely dissociates in water to form one mole of hydroxide ions (OH-) for every mole of NaOH. Therefore, the concentration of hydroxide ions in the final solution is also 0.0016 M.

To calculate the pH of the solution, we use the following equation:

pH = 14 - pOH

Since the concentration of hydroxide ions is 0.0016 M, the pOH is:

pOH = -log[OH-]

= -log(0.0016)

= 2.80

Therefore, the pH of the solution is:

pH = 14 - pOH

= 14 - 2.80

= 11.20

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Answer:

Thermal Energy: It refers to some distinct physical concepts, such as the internal energy of a system or heat or sensible heat. And these mode of transfer of heat include, convection, conduction and radiation which I have explained below.

Convection: This is a mode of transfer of heat in which bulk movement of molecules within fluids takes place, as these molecules move the heat obtained by each of the molecules will reach the new location.

Radiation: Radiation is the emission or transmission of energy in the form of waves or particles through space or through a material medium

Conduction: Conduction is the transfer of internal energy by microscopic collisions of particles and the movement of electrons within an object.

Answer:To calculate the concentration of the Fe(NO3)3 solution after dilution, we can use the formula:

Explanation:

C1V1 = C2V2

C1 = Initial concentration of the solution

V1 = Initial volume of the solution

C2 = Final concentration of the solution

V2 = Final volume of the solution

Initial concentration (C1) = 3.0 M

Initial volume (V1) = 80 mL

Final volume (V2) = 1500 mL

Using the formula, we can solve for C2:

C1V1 = C2V2

(3.0 M)(80 mL) = C2(1500 mL)

Rearranging the equation to solve for C2:

C2 = (C1V1) / V2

C2 = (3.0 M)(80 mL) / 1500 mL

C2 ≈ 0.16 M

Therefore, the concentration of the Fe(NO3)3 solution after dilution is approximately 0.16 M.

we have an initial solution of Fe(NO3)3 with a concentration of 3.0 M and a volume of 80 mL. The goal is to dilute this solution to a final volume of 1500 mL and determine the concentration of the diluted solution.

To do this, we can use the dilution formula: C1V1 = C2V2, where C1 and V1 represent the initial concentration and volume, and C2 and V2 represent the final concentration and volume.

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Answer:

The answer is sodium which is the element is the most reactive.

In this balanced equation, the coefficient for Cu is 6. So the correct answer is: 6

In the given equation, the reaction is between copper (Cu) and nitric acid (HNO3), and the products formed are copper(II) nitrate (Cu(NO3)2), nitrogen monoxide (NO), nitrogen dioxide (NO2), and water (H2O). The ratio of NO to NO2 is given as 2:3.

To balance the equation, we need to ensure that the same number of atoms of each element are present on both sides of the equation. Here's how the equation is balanced:

6 Cu + 18 HNO3 → 6 Cu(NO3)2 + 4 NO + 6 NO2 + 6 H2O

The coefficient for Cu is 6, which means that 6 moles of Cu are reacting with the other species in the equation. This coefficient is chosen in such a way that it balances the equation, ensuring that there are 6 moles of Cu on both the reactant and product sides of the equation.

So, the correct answer for the coefficient of Cu in the balanced equation is 6. This means that 6 moles of Cu are required to react with 18 moles of HNO3 to produce 6 moles of Cu(NO3)2, 4 moles of NO, 6 moles of NO2, and 6 moles of H2O, while maintaining the given ratio of NO to NO2 (2:3).

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The concentration of iron(iii) chloride contaminant in the original groundwater sample is (C1 × V1 / V) × 162.2 g/mol.

Given that the chemist adds m silver nitrate solution to the sample until silver chloride stops forming. He then washes, dries, and weighs the precipitate. He finds he has collected of silver chloride. Let us calculate the concentration of iron(iii) chloride contaminant in the original groundwater sample.Calculating the concentration of iron(iii) chloride contaminant in the original groundwater sample

Here is the given information;

Mass of silver chloride precipitate = m grams

Volume of groundwater sample taken = V ml

Volume of AgNO3 solution used = V1 ml

Concentration of AgNO3 solution = C1

Molar Mass of AgCl precipitated = 143.5 g/mol

The molarity of AgNO3 solution is given as;

Molarity of AgNO3 = Number of equivalents / Volume of solution in liters

We know that 1 mole of AgNO3 gives 1 mole of AgCl, i.e., AgNO3 is equivalent to AgCl.Therefore, the number of equivalents of AgNO3 is the same as the number of equivalents of AgCl.

Number of equivalents of AgNO3 = C1 × V1

Number of equivalents of AgCl = m / 143.5 g/mol

Concentration of FeCl3 = (Number of equivalents of FeCl3 / Volume of sample in liters) × Molar mass of FeCl3

Number of equivalents of FeCl3 = Number of equivalents of AgNO3

Number of equivalents of FeCl3 = C1 × V1

Concentration of FeCl3 = (C1 × V1 / V) × Molar mass of FeCl3

Concentration of FeCl3 = (C1 × V1 / V) × 162.2 g/mol

Hence, the concentration of iron(iii) chloride contaminant in the original groundwater sample is (C1 × V1 / V) × 162.2 g/mol.

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When HCl is added to an acetate buffer, the reaction goes as follows {CH3COO- + H+ -> CH3COOH}

Hence, the acetate ion reacts with hydrogen ions and produces acetic acid and the pH decreases. After that, the buffer maintains the pH by preventing the change of the concentration of the hydrogen ion by producing additional buffer. Hence, the pH value of the solution changes only slightly even after the addition of HCl. We can determine the pH of the solution by using the Henderson-Hasselbalch equation:Hence, the pH of the solution is 4.74.-100 WORDSBuffer solutions are those solutions that maintain their pH even after the addition of small amounts of acids and bases. An acetate buffer is a solution that consists of acetic acid and sodium acetate. Acetic acid is a weak acid and sodium acetate is a salt of a weak acid. When the weak acid and its salt are mixed in the buffer solution, they form a buffer.

The buffer solution has the property of maintaining its pH by preventing changes in the concentration of hydrogen ions. Hence, even after the addition of HCl, the pH of the solution changes slightly.

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5.175 g of NO2 will be produced. Mass = number of moles × molar mass= 0.1125 mol × 46 g/mol= 5.175 g.

Given,5.40 g of O3 reacts with 8.670 g of NO. The balanced chemical equation is, O3 + NO → O2 + NO2a) The limiting reagent is the reactant that is completely consumed first, thus limiting the amount of product that can be formed. We have to find the limiting reagent. First, we need to calculate the number of moles of each reactant and then we can compare which reactant is present in less amount. The number of moles can be calculated as follows.Number of moles of O3 = (mass of O3) / (molar mass of O3)= 5.40 g / 48 g/mol = 0.1125 molNumber of moles of NO = (mass of NO) / (molar mass of NO)= 8.670 g / 30 g/mol = 0.2890 molNow, we have to find which compound is limiting reagent. We will compare the amount of each reactant in moles. The balanced equation shows that O3 and NO react in a 1:1 ratio, so the amount of NO is greater than what is required to react completely with O3. So, NO will be the excess reagent and O3 will be the limiting reagent. b) The number of moles of NO2 produced will depend on the number of moles of O3 consumed because O3 is the limiting reagent. From the balanced chemical equation, 1 mole of O3 produces 1 mole of NO2. Number of moles of NO2 produced = (number of moles of O3 consumed) = 0.1125 molThe mass of NO2 produced can be calculated as follows:Mass = number of moles × molar mass= 0.1125 mol × 46 g/mol= 5.175 g. Therefore, 5.175 g of NO2 will be produced.

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Answer:

no idea about this question sorry

The equilibrium constant (K) for the given reaction at 25°C is approximately 151.6.

To determine the equilibrium constant (K) for a reaction using the standard Gibbs free energy (∆G°), we can use the equation:

∆G° = -RT ln(K)

Where:

∆G° is the standard Gibbs free energy (-12.6 kJ in this case),

R is the gas constant (8.314 J/mol·K),

T is the temperature in Kelvin (25°C = 298 K),

K is the equilibrium constant we want to calculate.

First, we need to convert the given ∆G° from kilojoules to joules:

∆G° = -12.6 kJ * 1000 J/kJ = -12,600 J

Now we can substitute the values into the equation and solve for K:

-12,600 J = -8.314 J/mol·K * 298 K * ln(K)

Dividing both sides by (-8.314 J/mol·K * 298 K):

ln(K) = -12,600 J / (-8.314 J/mol·K * 298 K)

Calculating the right side of the equation:

ln(K) ≈ 5.023

Now, we can take the exponent of both sides to find K:

K ≈ e^(5.023)

Using a calculator, we find:

K ≈ 151.6

Therefore, the equilibrium constant (K) for the given reaction at 25°C is approximately 151.6.

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