Zinc chloride is also produced in a displacement reaction between zinc and
copper chloride solution.
The equation for the reaction is:
Zn + CuCl₂ → ZnCl₂ + Cu
Complete the ionic equation for this reaction.
Zn +_____→ Zn²+ _____+
Why is zinc described as being oxidised in this reaction?

The theoretical yield of compound is 2.0 g, and the actual amount of compound isolated at the end of the reaction is 1.32 g.

Based on the information given, the theoretical yield of compound would be calculated as follows:

1. Determine the limiting reactant by calculating the moles of each compound:
Moles of compound = initial amount of compound / molecular weight of compound
Moles of compound = 2.0 g / (molecular weight of compound)
Moles of compound = x g / (molecular weight of compound)

The limiting reactant is the one that produces the smallest amount of product. In this case, we will assume that compound is the limiting reactant.

2. Calculate the theoretical yield of compound:
Theoretical yield of compound = (moles of limiting reactant) x (molecular weight of compound)
Theoretical yield of compound = (moles of compound) x (molecular weight of compound)
Theoretical yield of compound = (2.0 g / molecular weight of compound) x (molecular weight of compound)
Theoretical yield of compound = 2.0 g
The theoretical yield of compound is 2.0 g.

Next, we need to calculate the actual amount of compound that was isolated at the end of the reaction:
Actual yield of compound = percent yield x theoretical yield
Actual yield of compound = 0.66 x 2.0 g
Actual yield of compound = 1.32 g

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Answer: Sure thing! The solubility product constant (Ksp) for BaSO4 at 298 K is 1.1 x 10^-10. To calculate the solubility (S) of BaSO4 in mol/L at 298 K, we can use the following expression:

Ksp = [Ba2+][SO42-]

where [Ba2+] is the molar concentration of Ba2+ ions and [SO42-] is the molar concentration of SO42- ions in solution. Since BaSO4 is a sparingly soluble salt, we can assume that the concentration of Ba2+ and SO42- ions in solution is equal to the solubility of BaSO4 (S). Therefore:

Ksp = S^2

S = sqrt(Ksp)

S = sqrt(1.1 x 10^-10) = 1.05 x 10^-5 mol/L

Therefore, the solubility of BaSO4 in mol/L at 298 K is 1.05 x 10^-5 mol/L.

Explanation:

No, the mass of a neutral atom of 18O is not equal to the sum of the masses of 8 atoms of 1H and 10 neutrons.

The mass of an atom is not only determined by the number of protons and neutrons it has, but also by the energy that holds these particles together. This energy is called the binding energy, and it can vary depending on the arrangement of the particles in the nucleus.

In the case of 18O, the binding energy between the protons and neutrons is different than the binding energy between hydrogen atoms and neutrons. Therefore, the mass of a neutral atom of 18O cannot be calculated simply by adding up the masses of its constituent particles.

Additionally, it is important to note that the mass of a neutral atom of 18O is not exactly 18 atomic mass units (amu) either. This is because the mass of an atom is also affected by the electrons in its outer shells. The exact mass of an atom of 18O is 17.999 amu.

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The solution formed by each salt can be acidic, basic, or neutral depending on the behavior of the salt in water. In this case, the base [tex]NH_3[/tex] is stronger than the acid HF, and thus, the solution formed by the salt [tex]K(NH_3)[/tex] will be basic. The solution formed by the salt HF will be acidic.

[tex]K(NH_3)[/tex] : This salt is formed by the reaction between KOH (a strong base) and  [tex]NH_3[/tex] (a weak base). Since KOH is a strong base, it will completely dissociate into K and  [tex]OH^{-}[/tex] ions in water.  [tex]NH_3[/tex] , on the other hand, is a weak base and will partially dissociate into [tex]NH_4^{+}[/tex] and [tex]OH^{-}[/tex] ions. The resulting solution will be basic due to the excess of   [tex]OH^{-}[/tex] ions present.

HF: This salt is formed by the reaction between NaOH (a strong base) and HF (a weak acid). NaOH will completely dissociate into [tex]OH^{-}[/tex] ions in water. HF, being a weak acid, will partially dissociate into H and F ions. The resulting solution will be acidic due to the excess of H ions present.

To determine whether the resulting solution is acidic or basic, we need to compare the strengths of the acid and the base formed by the salt hydrolysis. If the acid is stronger than the base, the resulting solution will be acidic. If the base is stronger than the acid, the resulting solution will be basic. If the acid and base are of equal strength, the resulting solution will be neutral.

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The typical sampling time for an active tube procedure can vary depending on the specific application and the sampling requirements.

However, it is typically shorter than 4 hours and can range from a few minutes to a few hundred minutes (i.e. 4 minutes to 200 minutes), A typical sampling time for an active tube procedure is 200 minutes.

In this procedure, an air sample is drawn through an active tube at a specific flow rate for a certain period, known as the "sampling time." The tube collects and concentrates the target compounds present in the air, which can then be analyzed to determine their concentrations.

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The products of this reaction are Tin (Sn) and Water (2H_{2}O). The reactants, Tin(IV) oxide (SnO_{2}) and Hydrogen gas (2H_{2}), undergo a redox reaction to produce these products.

In the given chemical reaction, SnO_{2} + 2H_{2]} → Sn + 2H_{2}O., the products are Sn (Tin) and 2H_{2}O (Water). Let's analyze the reaction step-by-step.
1. The reactants are SnO_{2} (Tin(IV) oxide) and 2 H_{2}(Hydrogen gas).

Tin is commonly used in the manufacturing of metal alloys, such as bronze and pewter, and can also be found in the production of tinplate for food packaging.
2. The reaction involves the reduction of SnO_{2}  and the oxidation of H_{2}
3. SnO2 loses oxygen and is reduced to Sn (Tin). Meanwhile, H2 gains oxygen and is oxidized to H2O (Water).
4. The balanced chemical equation is: SnO_{2} + 2H_{2]} → Sn + 2H_{2}O.
In summary, the products of this reaction are Tin (Sn) and Water (2H_{2}O). The reactants, Tin(IV) oxide (SnO2) and Hydrogen gas (2 H_{2}), undergo a redox reaction to produce these products.

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The student's solution has a molarity of 0.169 M and a molality of 0.246 m. First, let's start by using the formula for molarity:

Molarity = moles of solute / liters of solution
We know that the student dissolved sucrose in a solvent with a density of , and the volume of the solvent did not change. This means that the total volume of the solution is the same as the volume of the solvent, which we can calculate using the density:
Volume of solvent = mass of solvent / density
Volume of solvent =  /  
Volume of solvent =  
Now, we need to calculate the moles of sucrose that the student dissolved in the solvent. To do this, we need to use the formula:
moles = mass / molar mass
The molar mass of sucrose is 342.3 g/mol. Let's assume that the student dissolved 10 g of sucrose in the solvent.
moles of sucrose = 10 g / 342.3 g/mol
moles of sucrose =  
Now, we can calculate the molarity:
Molarity = moles of solute / liters of solution
Molarity =  /  
Molarity =  
The molarity of the student's solution is 0.169 M.
Next, we need to calculate the molality. The formula for molality is:
Molality = moles of solute / kilograms of solvent
We know that the mass of the solvent is the same as the mass of the solution, since the volume of the solvent did not change. So, the mass of the solvent is:
Mass of solvent = mass of solvent + mass of solute
Mass of solvent =  / 1000
Mass of solvent =  
Now we can calculate the molality:
Molality = moles of solute / kilograms of solvent
Molality =  /  
Molality =  
The molality of the student's solution is 0.246 m.
In summary, the student's solution has a molarity of 0.169 M and a molality of 0.246 m.

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A water molecule has a tetrahedral shape, with the central oxygen atom and two hydrogen atoms at three of the four apexes, and partial negative charges at the remaining two apexes. This shape is due to the arrangement of electrons in the molecule.

The oxygen atom in water has six valence electrons, which form four covalent bonds with the two hydrogen atoms and two lone pairs.

These lone pairs cause a slight distortion in the shape of the molecule, resulting in a tetrahedral arrangement.

Hence, the tetrahedral shape of a water molecule is due to the arrangement of electrons and results in partial negative charges at two of the apexes, with the central oxygen atom and two hydrogen atoms at the other three.

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One UV photon can break the atomic bond of almost one water molecule. However, it is important to note that the actual number of molecules/atoms that can be changed by one photon depends on several factors, such as the intensity and duration of the exposure.

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Answer:

a. 8.075 mol Au = 8.075 mol x 196.97 g/mol =

1594.9 g Au

b. 4.20 x 10^22 atoms Na= 4.20 x 10^22

atoms x 22.99 g/mol = 95.418 x 10^22 g Na

The code for corrosion control of underground storage tank systems by cathodic protection is  B) SP0169

Petroleum products are kept in a tank farm before being distributed to end users or retail establishments. A tank farm often has extremely basic amenities. Tanks can be above or below ground, with plumbing to link them to tankers and pipelines to allow fuel to be dispensed and the tanks to be filled. Numerous tank farms are situated close to ports, rail yards, major trucking terminals, and refineries (for convenience). Moving fuel into and out of the farm is made simple by these places. Another possible location for a tank farm is alongside a pipeline that carries petroleum products. In tank farms, cathodic protection systems and grounding systems may be used for corrosion control and safety reasons, respectively.
The correct code for Corrosion Control of Underground Storage Tank Systems by Cathodic Protection is:

B) SP0169

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The skier's speed, height, and time, are not directly related to the determination of the reaction force of the snow pushing on the skier.

Chemical reactions are fundamental processes in which atoms are rearranged to form new substances with different properties than the original ones. A chemical reaction occurs when reactants come together in a specific way to form products. Reactants are the starting materials, while products are the new substances formed by the reaction.

Chemical reactions are governed by the laws of thermodynamics and kinetics. The law of conservation of mass dictates that the total mass of the reactants must be equal to the total mass of the products. The law of conservation of energy states that energy cannot be created or destroyed, only transformed from one form to another. Therefore, chemical reactions must either absorb or release energy, depending on the nature of the reaction. Chemical reactions can be classified as exothermic or endothermic. Exothermic reactions release energy, usually in the form of heat, while endothermic reactions absorb energy.

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Based on the DNA sequences provided, Person A and Person C are more closely related.

To determine relation, compare the nucleotides at each position in the sequences.

At position 1, Person A and Person C both have "A" nucleotide, while Person B has "G" nucleotide.

At position 2, Person A has "T" nucleotide, Person B has "T" nucleotide, and Person C has "C" nucleotide.

At position 3, Person A and Person C both have "C" nucleotide, while Person B has "T" nucleotide.

Continuing this method for all places in the sequences reveals that Person A and Person C share more nucleotides than Person B. This shows that they are linked to each other more closely than to Person B.

In terms of concrete evidence for evolution, new dog breeds, drought-resistant crops, and more virulent viruses are all instances of microevolution at work.

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The chemical associated with homeostatic sleep drive is adenosine. Adenosine is a naturally occurring chemical compound in the body that is a byproduct of the breakdown of ATP (adenosine triphosphate), the primary energy source for cells. Adenosine levels increase in the brain as wakefulness persists, and its buildup eventually signals to the brain that it is time to sleep.

Adenosine acts as an inhibitor of wake-promoting neurons in the brain, leading to drowsiness and a desire to sleep. Caffeine, which is a widely used stimulant, works by blocking the effects of adenosine in the brain, thereby promoting wakefulness. The homeostatic sleep drive, which is the body's natural tendency to regulate sleep-wake cycles, is closely linked to adenosine levels. The accumulation of adenosine during wakefulness drives the need for sleep, and the reduction of adenosine during sleep prepares the body for wakefulness. In summary, adenosine plays a critical role in the regulation of sleep-wake cycles, and its levels in the brain are closely linked to the homeostatic sleep drive.

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When a strong acid is titrated with a weak base, the pH of the solution at the equivalence point is less than 7.

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The diene that reacts with one equivalent of HBr to form the two bromoalkene products described in the question can be drawn as follows:

    H          H

    |          |

H3C-C=C-CH2-CH=CH2

    |          |

    H          H

In this diene, there are two double bonds, one between carbons 2 and 3 and another between carbons 4 and 5. When one equivalent of HBr is added to this diene, an electrophilic addition reaction occurs in which the H and Br add to the two double bonds to form two different products, as described in the question.

The effect of increasing temperature on the relative amount of each product can be explained by considering the mechanism of the reaction. The reaction proceeds through a carbocation intermediate, which is formed by protonation of the diene with HBr. The carbocation intermediate can then react with Br- to form the bromoalkene products.

Product 1 is formed by the addition of HBr to the double bond between carbons 2 and 3, which results in the formation of a more stable tertiary carbocation intermediate. As the temperature increases, the reaction rate increases, which can lead to a higher proportion of product 1 being formed. However, at very high temperatures, the reaction rate can become too fast, leading to increased side reactions such as rearrangements, which can decrease the relative amount of product 1.

Product 2 is formed by the addition of HBr to the double bond between carbons 4 and 5, which results in the formation of a less stable secondary carbocation intermediate. As the temperature increases, the reaction rate also increases, which can lead to a higher proportion of product 2 being formed. However, at very high temperatures, the reaction rate can become too fast, leading to increased side reactions such as elimination, which can decrease the relative amount of product 2.  Therefore, the answer to the question is that as the temperature increases, the relative amount of product 1 is expected to increase, while the relative amount of product 2 is expected to decrease due to side reactions. However, at very high temperatures, both products can be affected by side reactions, and the relative amounts may not change significantly.

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The pressure (in mmHg) of the 9.62 L container having 4.95 moles of gas at 592.84 is 19022.77 mmHg

First, we shall list out the given parameters from the question. This is shown below:

Ideal gas equation states as follow:

PV = nRT

Inputting the give parameters, we can obtain the pressure as follow:

P × 9.62 = 4.95 × 62.36 × 592.84

P × 9.62 = 182999.03688

Divide both sides by 9.62

P = 182999.03688 / 9.62

P = 19022.77 mmHg

Thus, we can conclude from the above calculation that the pressure of the container is 19022.77 mmHg

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Answer:

O2

Explanation:

The green box is O2 because oxygen exists in the atmosphere as a diatomic atom, meaning it must have two oxygens (di prefix means two)

Diatomic atoms never exist naturally unless there are two.

The negative sign indicates that the concentration gradient is in the direction of high to low hydrogen concentration. The flux of hydrogen through the foil is 4.3 × [tex]10^5[/tex] atoms/([tex]cm^2.s[/tex]) from the high hydrogen gas to the low hydrogen gas.

J = -D (dC/dx)

a) The concentration gradient of hydrogen can be calculated as follows:

dC/dx = (C2 - C1)/x

dC/dx = (2 × 10³ - 5 × [tex]10^8[/tex])/(0.001 × 2.54 × [tex]10^{-4}[/tex]) = -7.8 × [tex]10^{14}[/tex] atoms/[tex]cm^4[/tex]

(b) The flux of hydrogen through the foil can be calculated using Fick's first law:

J = -D (dC/dx)

D = D0 exp(-Q/RT)

D = 1.6 ×[tex]10^{-6}[/tex]exp(-44,200/8.31/923) = 5.5 × 10^-10 [tex]cm^2/s[/tex]

Substituting the calculated concentration gradient, we get:

J = -D (dC/dx) = -5.5 × [tex]10^{-10}[/tex] × (-7.8 × [tex]10^{14}[/tex]) = 4.3 × [tex]10^5[/tex] atoms/([tex]cm^2.s[/tex])

Concentration refers to the amount of solute that is dissolved in a given amount of solvent or solution. It is an essential concept in chemistry and plays a vital role in many processes such as synthesis, reaction, and separation. The concentration of a solution can affect its properties and behavior. For example, a more concentrated solution may have a higher boiling point or freezing point than a less concentrated one.

There are several ways to express the concentration of a solution, including molarity, molality, mass percent, mole fraction, and parts per million (ppm). Molarity is the most commonly used unit and is defined as the number of moles of solute dissolved per liter of solution. Molality is another unit that measures the number of moles of solute per kilogram of solvent.

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The correct answer is: O depends on the relative values of the acid and base dissociation constants.

The pH at the equivalence point of a weak acid and weak base titration cannot be predicted solely based on their concentrations. It depends on the relative values of their acid and base dissociation constants (Ka and Kb), which determine their relative strengths. If Ka > Kb, the resulting salt will be acidic, and the pH at the equivalence point will be below 7. If Kb > Ka, the salt will be basic, and the pH at the equivalence point will be above 7. If Ka = Kb, the salt will be neutral, and the pH at the equivalence point will be equal to 7.When titrating a weak acid with a weak base that have the same concentration, the equivalence point will have a pH that depends on the relative values of the acid and base dissociation constants.

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The iron (iii) phenanthroline complex ion will be made during this experiment the phenanthroline ligand is classified as a bidentate ligand which means : "the ligand forms two bonds with the Fe3+ cation."

A bidentate ligand is a molecule or an ion that can form two coordinate bonds with a metal ion. In the case of the iron (III) phenanthroline complex ion, the phenanthroline ligand (C12H8N2) can bind to the Fe3+ cation through two nitrogen atoms, each forming a coordinate covalent bond. Therefore, the ligand forms two bonds with the Fe3+ cation, making it a bidentate ligand.

A bidentate ligand is a molecule or ion that can form two coordinate bonds with a metal ion. In the case of the iron (III) phenanthroline complex ion, the phenanthroline ligand (C12H8N2) forms two coordinate covalent bonds with the Fe3+ cation, making it a bidentate ligand.

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The combined weight of 1 mol of H atoms and 1 mol of Li atoms is 7.94 grams.

To calculate the combined weight of 1 mol of H atoms and 1 mol of Li atoms, you need to use the molar masses of both elements.
Step 1: Find the molar masses of H and Li
The molar mass of hydrogen (H) is approximately 1 gram/mol, and the molar mass of lithium (Li) is approximately 6.94 grams/mol.
Step 2: Calculate the combined weight
To find the combined weight, you simply add the molar masses of the two elements:
Combined weight = (1 mol of H atoms * molar mass of H) + (1 mol of Li atoms * molar mass of Li)
Combined weight = (1 * 1 g/mol) + (1 * 6.94 g/mol)
Combined weight = 1 g + 6.94 g
Combined weight = 7.94 g
So, the combined weight of 1 mol of H atoms and 1 mol of Li atoms is 7.94 grams.

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The molecular formula C6H14 represents a saturated hydrocarbon with six carbon atoms and 14 hydrogen atoms. To determine the number of structural isomers, we need to consider the different ways in which these atoms can be arranged in a molecule while maintaining the same molecular formula.

One way to approach this problem is to start with the straight-chain structure of n-hexane, which has all six carbon atoms in a row with each carbon atom bonded to two hydrogen atoms. This isomer is called the n-isomer or normal hexane. The other isomers can be obtained by branching or rearranging the carbon chain.The first branched isomer is 2-methylpentane, which has a five-carbon chain with a methyl (CH3) group attached to the second carbon atom. The second branched isomer is 3-methylpentane, which has a five-carbon chain with a methyl group attached to the third carbon atom. The third branched isomer is 2,2-dimethylbutane, which has a four-carbon chain with two methyl groups attached to the second carbon atom.The fourth isomer is 2,3-dimethylbutane, which has a four-carbon chain with one methyl group attached to the second carbon atom and another methyl group attached to the third carbon atom. The fifth isomer is 2,4-dimethylpentane, which has a five-carbon chain with one methyl group attached to the second carbon atom and another methyl group attached to the fourth carbon atom.Therefore, the answer is B. 5, there are five structural isomers possible with the molecular formula C6H14.

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The process that is expected to have an increase in entropy is the decomposition of N₂O₄ gas to NO₂ gas (Option B).

The decomposition of a gas into two different gases results in an increase in the number of particles and therefore an increase in disorder or entropy. The formation of liquid water from hydrogen and oxygen gas and the precipitation of BaSO₄ from mixing solutions of BaCl₂ and Na₂SO₄ are both examples of processes that result in a decrease in entropy as the particles become more ordered. Iron rusting can also be considered an increase in entropy as the solid metal turns into a mixture of solid and liquid particles.

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The chemist should pour out 10 mL of the silver(ii) oxide stock solution into a graduated cylinder and dilute it with distilled water to prepare a 100 mL aqueous silver(ii) oxide working solution with a concentration of 0.01 M.

To calculate the volume of the silver(ii) oxide stock solution that the chemist should pour out, we need to use the dilution equation:
C1V1 = C2V2
where C1 is the concentration of the stock solution, V1 is the volume of the stock solution to be poured out, C2 is the desired concentration of the working solution, and V2 is the final volume of the working solution.
Let's assume that the concentration of the silver(ii) oxide stock solution is 0.1 M and the desired concentration of the working solution is 0.01 M. We also need to know the final volume of the working solution, which is not given in the question. Let's assume that the chemist wants to prepare 100 mL of the working solution.
Substituting the values in the dilution equation, we get:
0.1 M x V1 = 0.01 M x 100 mL
Solving for V1, we get:
V1 = (0.01 M x 100 mL) / 0.1 M
V1 = 10 mL
Therefore, the chemist should pour out 10 mL of the silver(ii) oxide stock solution into a graduated cylinder and dilute it with distilled water to prepare a 100 mL aqueous silver(ii) oxide working solution with a concentration of 0.01 M. This calculation assumes that the chemist has a silver(ii) oxide stock solution with a known concentration and that she wants to prepare a working solution with a lower concentration.

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The following formula can be used to determine how many moles of KC1 are present in 1250 mL of 0.75 M KC1: Molarity (M) is equal to the moles of solute per litre of solution.

In this instance, the volume of the solution is 1250 mL, and the molarity of KC1 is 0.75 M. The following formula can be used to determine how many moles of KC1 are present in 1250 mL of 0.75 M KC1: Molarity (M) times the number of litres in the solution equals 0.75 M times (1250 mL/1000 mL/L) or 0.9375 moles of KC1.

Consequently, 0.9375 moles of KC1 are present in 1250 mL of 0.75 M KC1. It is significant to remember that a solution's molarity is a measurement of the amount of a solute present in a given volume of the solution.

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Answer:

Ghrelin

Explanation:

Ghrelin is produced in the stomach and stimulates food intake. The correct option is d.

Ghrelin is a hormone produced in the stomach that stimulates food intake. It is often referred to as the "hunger hormone" because it plays a crucial role in regulating appetite. When the stomach is empty, ghrelin levels increase, signaling the brain to initiate feelings of hunger and promote eating. Once the stomach is full, ghrelin levels decrease, reducing the desire to eat and contributing to feelings of satiety.

The other options, Peptide PYY, Cholecystokinin, and Gastrin, are not primarily responsible for stimulating food intake. Peptide PYY is an appetite-suppressing hormone released by the intestines in response to food consumption, helping to induce feelings of fullness. Cholecystokinin, another hormone secreted by the small intestine, plays a role in digestion and also contributes to satiety. Gastrin, produced in the stomach, is primarily involved in stimulating the secretion of gastric acid, which aids in the breakdown of food during digestion.

In summary, ghrelin is the hormone produced in the stomach that stimulates food intake, making option d the correct answer.

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