Onversion of 1 mol of acetyl-coa to 2 mol of co_2 and coa via the citric acid cycle results in the net production of

With the addition of solar energy, the overall chemical reaction for photosynthesis is 6 molecules of carbon dioxide (CO2) and 6 molecules of water (H2O). This results in the formation of 1 molecule of glucose (C6H12O6) and 6 molecules of oxygen (O2).

Glucose is the most common type of sugar found in the blood and the primary source of energy for the body's cells. Glucose comes from the foods we eat, or it can be produced by the body from other substances.

So, Six "turns" of the Calvin cycle combine six carbon atoms from six CO2 molecules with 12 "hot hydrogens" from NADPH using chemical energy from ATP. C6H12O6 is the resulting molecule of glucose.

Light energy is used in photosynthesis to convert carbon dioxide and water into glucose and oxygen. 1 glucose molecule and 6 oxygen molecules are produced for every 6 carbon dioxide and 6 water molecules.

Thus, 1 molecules of glucose are produced by each cycle of the light reaction.

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Answer : The letter represents the enthalpy of reaction is, 'H'

Explanation:

Enthalpy of a reaction : Enthalpy of a reaction is defined as the energy change which takes place when the reactants go to the products.

Enthalpy of a reaction is represented as, [tex]\Delta H[/tex]. In this, 'H' represent the enthalpy.

When the enthalpy of reaction is positive that means the heat is absorbed during the reaction.

When the enthalpy of reaction is negative that means the heat is released during the reaction.

That means,  when the enthalpy of reaction is negative then the energy is released and the reaction will be exothermic reaction.

when the enthalpy of reaction is positive then the energy is absorbed and the reaction will be endothermic reaction.

Hence, the letter represents the enthalpy of reaction is, 'H'

The coefficients needed to balance the equation H2O + Fe → Fe2O3 + H2 are 4H2O + 3Fe → Fe2O3 + 4H2. These coefficients ensure the number of atoms of each element is the same on both sides of the equation.

To balance the equation H2O + Fe → Fe2O3 + H2, we need to ensure that the number of each type of atom on the left side of the equation matches the number on the right side. The balanced equation would be: 4H2O + 3Fe → Fe2O3 + 4H2. Here, we are using stoichiometry which is a part of chemical reactions. In balancing chemical equations, coefficients are used in front of the chemical formulas to indicate the number of molecules or atoms involved in the reaction.

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The molar solubility of a compound can be calculated using its solubility product constant, Ksp. For tin(II) hydroxide, the Ksp is used in conjunction with the stoichiometry of its dissolution in water to find the maximum amount that can dissolve per liter of solution.

The solubility product constant, or Ksp, is a measure of how much of a particular ionic compound can dissolve in a solution. It's used to calculate the molar solubility, which is the maximum amount of the compound that can dissolve per liter of solution. In this case, the Ksp of tin(II) hydroxide, Sn(OH)2, is given as 5.45 × 10-27.

To calculate the molar solubility, we use the expression for the dissolution of Sn(OH)2 in water: Sn(OH)2 (s) <==> Sn2+ (aq) + 2OH- (aq) Due to the stoichiometry of the reaction, the concentration of Sn2+ is 'x' and that of OH- is '2x'. The KSP expression is: Ksp = [Sn2+][OH-]^2 = x * (2x)^2 = 4x^3. Setting this to the given Ksp value, we get: 5.45 × 10-27 = 4x^3. Solving for 'x' gives us the molar solubility of Sn(OH)2.

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Answer:

Measuring the level of lead in drinking water is the job of an analytical chemist.

Explanation:

The work of analytical chemists is to analyse the chemical properties and nature of the substance.

They have to perform different experiments using instruments and then conclude about the nature of the sample, chemical properties of the sample, toxicology, concentration and other properties of the samples and then the analytical chemists should give a detailed report on the measurements or analysis he or she has carried out.

So the measuring of lead in drinking water forms under the measurement of toxicology of water as lead is toxic on reaction with water so it is the job of analytical chemists only.

Answer:

Definitely an analytical chemist. Because the substance has to be analyzed to look for those chemicals and toxins.

Explanation:

ΔT = Kf · b(solution) · i.

Kf - the freezing point depression constant.

i - Van 't Hoff factor. Because dissociate on one cation and one anions, sodium hydroxide has i = 2, other molecules has covalent bonds (i = 1, do not dissociate on ions).

Because molality and the freezing point depression constant are constant, greatest freezing point lowering is solution with highest Van 't Hoff factor.

Answer: NaOH

Explanation:

Answer: Electronic configuration of

1. Aluminium is [tex][Ne]3s^23p^1[/tex]

2. Arsenic is [tex][Ar]4s^23d^{10}4p^3[/tex]

Explanation: To write the electronic configuration of the elements in the noble gas notation, we first count the total number of electrons and then write the noble gas which lies before the same element.

Atomic number = 13

Total number of electrons = 13

Noble gas which lies before this element is Neon (Ne).

Neon has 10 electrons, rest 3 electrons are filled in 3s and 3p sub-shells.

Electronic configuration of Aluminium becomes [tex][Ne]3s^23p^1[/tex]

Atomic number = 33

Total number of electrons = 33

Noble gas which lies before this element is Argon (Ar).

Neon has 18 electrons, rest 15 electrons are filled in 4s , 3d and 4p sub-shells.

Electronic configuration of Arsenic becomes [tex][Ar]4s^23d^{10}4p^3[/tex].

Answer:

C  and the other one is A

Explanation:

trust me

Calcium nitrate  is the chemical formula of the salt produced by the neutralization of nitic acid calcium hydroxide.

Sodium chloride (NaCl), a mineral component important to health of humans and animals as well as business. To differentiate it from a family of chemical compounds known as salts, the crystalline type halite, meaning rock salt, is often referred to as common salt.

Table salt, which is widely used as a condiment, is fine-grained as well as of high purity. Small amounts of potassium aluminosilicate, tricalcium phosphate, and magnesium silicate are added to guarantee that such a hygroscopic compound remains free-flowing while exposed to the atmosphere. Calcium nitrate is the chemical formula of the salt produced by the neutralization of nitic acid calcium hydroxide.

Therefore, calcium nitrate is the chemical formula of the salt produced by the neutralization of nitic acid calcium hydroxide.

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Water is called the "universal solvent" due to its ability to dissolve many substances, which is crucial for supporting life. This is because of the polar nature of water molecules that allows them to interact with various compounds, making water indispensable for chemical reactions in the body and ecosystems.

Water (H₂O) is often referred to as the "universal solvent" because of its exceptional ability to dissolve many different substances, which is essential for life. This property is due to the polar nature of water molecules, which have a partial negative charge on the oxygen atom and a partial positive charge on the hydrogen atoms.

Solvent power is one of water's significant features; it can form true solutions with many substances, resulting in homogeneous mixtures. Water's polarity enables it to dissolve not only polar and ionic compounds, which are hydrophilic or "water-loving," but also to interact with nonpolar compounds, albeit less readily.

Water's ability to dissolve a myriad of substances makes it an ideal environment for cellular components to react and facilitate chemical reactions necessary for life. Moreover, water's role as a solvent is crucial in biological systems where it dissolves nutrients and other essential compounds, facilitating their transport and chemical reactions within the body.

The blank solution used to calibrate the spectrophotometer contains 0.2 M Fe(NO3)3 and 0.1 M HNO3 to reflect the composition of the actual samples and to maintain consistent ionic strength and acidity, leading to more accurate and reliable measurements.

When calibrating a spectrophotometer, it is preferred to use a blank solution that is reflective of the matrix of the samples being measured. In this case, the blank solution contains not just de-ionized water but also 0.1 M HNO3 and 0.2 M Fe(NO3)3 diluted accordingly. This approach is preferred because it accounts for the absorption of the solvent and any potential interaction with the analyte.

The use of HNO3 in the calibration blank maintains a consistent ionic strength and acidity as in the samples, which can affect the absorbance readings. This method reduces background noise and leads to more accurate and reliable measurements when comparing the blank to the actual samples containing Fe³+ ions.

The blank solution for calibration includes Fe(NO₃)₃  and HNO₃ to match the sample matrix, reducing calibration errors caused by matrix effects. De-ionized water fails to replicate the sample's chemical environment.

The blank solution used to calibrate the spectrophotometer is 10.0 mL of 0.2 M Fe(NO₃)₃  diluted to 25.0 mL with 0.1 M HNO₃. This solution is preferred over de-ionized water because it closely matches the matrix of the actual samples being measured, ensuring that any absorbance readings due to the matrix itself are accounted for. This reduces the possibility of matrix effects, thus providing a more accurate calibration for the spectrophotometer.  This ensures more accurate spectrophotometer readings.

De-ionized water lacks the chemical environment of the sample solutions, which could lead to calibration errors. By using a matrix-matched blank, the spectrophotometer can be properly calibrated, accounting for interactions between Fe(NO₃)₃ and HNO₃ that might affect absorbance.

The polyatomic ion in Ba3(PO4)2 is PO4^3-. To construct the formula for an ionic compound with polyatomic ions, the formula for the polyatomic ion is enclosed in parentheses if it is needed in more than one quantity, and the subscript representing the quantity is placed outside the parentheses.

The formula for the polyatomic ion in Ba3(PO4)2 is PO43-.

The whole compound Ba3(PO4)2 is composed of barium ions (Ba2+) and phosphate ions (PO43-).

Since barium has a charge of 2+ and phosphate has a charge of 3-, for the charges to balance in Ba3(PO4)2, we need three barium ions to balance the charge of two phosphate ions.

Each phosphate ion is a group of one phosphorus atom and four oxygen atoms carrying a net charge of 3-.

When writing the formula for a compound with more than one polyatomic ion, the formula of the polyatomic ion must be enclosed in parentheses with the appropriate numerical subscript outside the parentheses.

This subscript indicates the number of polyatomic ions in the compound.

Hence, the compound name calcium phosphate is represented by the formula Ca3(PO4)2, where three calcium ions balance the charge of two phosphate ions.

The saturated solution among the provided options is the one with 52g KCl in 100g water at 80 degrees Celsius, because KCl's solubility limit at this temperature is about 51g per 100g of water, and this solution marginally exceeds that amount. Hence correct option C.

To identify which option represents a saturated solution, one must refer to the solubility curves for each substance at the given temperatures. A saturated solution is one where the maximum amount of solute has dissolved in the solvent at a specific temperature. If more solute is added to a saturated solution, it will not dissolve and will remain as a precipitate. Conversely, if the amount of solute in a solution is less than the solubility limit at that temperature, the solution is considered unsaturated.

Looking at the options given by the student:

For NH₄Cl, its solubility at 50 degrees Celsius is approximately 62g per 100g of water, so if there's 40g NH₄Cl in 100g of water at 50 degrees Celsius, it is an unsaturated solution since it is less than the solubility limit.

For SO₂, its solubility at 10 degrees Celsius is much higher than 2g per 100g of water, implying that this is an unsaturated solution as well.

With KCl, the solubility at 80 degrees Celsius is about 51g per 100g of water. Since 52g KCl is mentioned, this solution is just over the saturation point, making it a saturated solution.

Lastly, KI's solubility at 20 degrees Celsius is around 140g per 100g of water, so a solution of 120g KI in 100g water is unsaturated.

Therefore, the correct answer is the one with 52g KCl in 100g water at 80 degrees Celsius, as it is the only saturated solution listed.

To burn 106.3 g of diborane (B₂H₆), 368.64 g of liquid oxygen (LOX) would be required. This is calculated based on the stoichiometry of the balanced chemical combustion reaction.

To calculate the mass of liquid oxygen (LOX) needed to burn 106.3 g of diborane (B₂H₆), we must first use the balanced chemical equation for the combustion of diborane:

B₂H₆ (g) + 3 O₂ (g) → 2 HBO₂ (g) + 2 H₂O (l)

From the equation, we can see that 1 mole of B₂H₆ reacts with 3 moles of O₂. First, determine the molar mass of B₂H₆ which is (2 × 10.81) + (6 × 1.008) = 27.7 g/mol. Now, divide the given mass of B₂H₆ by its molar mass to get the number of moles of B₂H₆:

106.3 g B₂H₆ × (1 mol B₂H₆/27.7 g) = 3.84 moles of B₂H₆

Now calculate the moles of O₂ required using the stoichiometry of the reaction (3 moles of O₂ per mole of B₂H₆):

3.84 moles of B₂H₆ × 3 moles O₂/1 mole B₂H₆ = 11.52 moles O₂

Finally, calculate the mass of O₂ using the molar mass of O₂ which is (2 × 16.00) = 32.00 g/mol:

11.52 moles of O₂ × 32.00 g/mol = 368.64 g of O₂

So, 368.64 g of LOX would be needed to burn 106.3 g of diborane (B₂H₆).

Recycling reduces the demand for new wood is correct

Answer:

D

Explanation: