ΔS is positive for the reaction __________. a. CaO(s) + CO2(g) -> CaCO3(s) b. N2(g) + 3H2(g) ->2NH3(g) c. 2SO3(g) -> 2SO2(g)+ O2(g) d. Ag+(aq) + Cl-(aq)-> AgCl(s) e. H2O(l) ->H2O(s)

Aryl and vinyl halides are not good substrates for [tex]SN_{2}[/tex] reactions due to the following reasons:

Steric hindrance: In the [tex]SN_{2}[/tex] reaction, the nucleophile attacks the electrophilic carbon from the backside, which requires a clear path of attack. In the case of aryl and vinyl halides, the bulky aromatic or double bond group attached to the electrophilic carbon creates a lot of steric hindrance, making it difficult for the nucleophile to approach the carbon from the required angle.

Partial double bond character: In the case of vinyl halides, the double bond character of the carbon-carbon bond in the vinyl group reduces the availability of the electrophilic carbon for nucleophilic attack, making it less susceptible to [tex]SN_{2}[/tex] reaction.

Resonance stabilization: In aryl halides, the aromatic ring structure provides resonance stabilization to the electrophilic carbon, which makes it less electrophilic and less susceptible to nucleophilic attack.

Overall, these factors make aryl and vinyl halides poor substrates for [tex]SN_{2}[/tex] reactions.

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The correct answer is C.4. Steroids are composed of four fused rings, specifically three cyclohexane rings and one cyclopentane ring. This fused ring system is called the steroid nucleus.

Steroids are a class of organic molecules that have a common structure consisting of four fused rings of carbon atoms. The three rings are cyclohexane in structure, while the fourth is a cyclopentane ring. This arrangement of rings gives steroids their characteristic structure and properties.

Steroids are synthesized naturally in the body and play a variety of important roles, including serving as hormones, signaling molecules, and structural components of cell membranes. Some common examples of steroids include cholesterol, estrogen, testosterone, and cortisol.

Steroids are also widely used in medicine for their anti-inflammatory and immunosuppressive properties. However, steroids are also commonly abused as performance-enhancing drugs, particularly in sports. The use of these drugs can lead to a range of negative health effects, including liver damage, infertility, and increased risk of heart disease and stroke.

The study of steroids and their properties is an active area of research in fields such as biochemistry, pharmacology, and synthetic chemistry.

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In order to determine which voltaic cell(s) have iron acting as the anode, we must first understand the basics of a voltaic cell.

A voltaic cell consists of two half-cells, each containing an electrode and a solution of an electrolyte. The half-cell with the higher reduction potential will act as the cathode, while the half-cell with the lower reduction potential will act as the anode.

In this scenario, we know that the half-cell with the Fe electrode contains a 1.0 M Fe(NO3)2(aq) solution. We also know the contents of the other half-cells: Cell 1 contains a 1.0 M CuCl2(aq) solution with a Cu electrode, Cell 2 contains a 1.0 M NiCl2(aq) solution with a Ni electrode, and Cell 3 contains a 1.0 M ZnCl2(aq) solution with a Zn electrode.

To determine which voltaic cell(s) have iron acting as the anode, we must compare the reduction potentials of each half-cell to that of the Fe half-cell. The standard reduction potential for the Fe2+/Fe half-cell is -0.44 V. The reduction potentials for the other half-cells are: Cu2+/Cu = +0.34 V, Ni2+/Ni = -0.23 V, and Zn2+/Zn = -0.76 V.

Based on these reduction potentials, we can determine that iron will act as the anode in Cells 2 and 3. In Cell 2, the Ni electrode has a more negative reduction potential than the Fe electrode, so Fe will be the anode. In Cell 3, the Zn electrode also has a more negative reduction potential than the Fe electrode, so Fe will again be the anode.

Overall, understanding the reduction potentials of each half-cell is crucial in determining which electrode will act as the anode in a voltaic cell.

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The molar mass of aluminium sulfide (Al₂S₃) is 150g/mol.

Molar mass is the mass of a given substance divided by its amount, measured in moles. It is commonly expressed in grams (sometimes kilograms) per mole.

The molar mass of a substance can be calculated by summing up the atomic mass of all the elements made up in the compound.

According to this question, aluminium sulfide with the chemical formula Al₂S₃ is given.

Molar mass of Al₂S₃ = 27(2) + 32(3)

Molar mass = 54 + 96 = 150g/mol

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Therefore, the percent composition of FeSO4x7H2O is: 20.10% Fe, 11.53% S, 63.33% O, 5.03% H

The molar mass of FeSO4x7H2O can be calculated as follows:

[tex]FeSO4* 7H2O = (1 * 55.845 g/mol) + (1 * 32.06 g/mol) + (4 * 16.00 g/mol) + (7 * 18.02 g/mol)[/tex]

FeSO4x7H2O = 278.01 g/mol

Now, we can calculate the mass of each element:

Mass of Fe = 0.0603 g

Mass of S = 0.0346 g

Mass of O = 0.190 g

Mass of H = 0.0151 g

Total mass of compound = 0.300 g

Calculating the percent composition of FeSO4x7H2O as follows:

Fe = (Mass of Fe / Total mass of compound) x 100%

Fe = (0.0603 g / 0.300 g) x 100%

Fe = 20.10%

S = (0.0346 g / 0.300 g) x 100%

S = 11.53%

O = (0.190 g / 0.300 g) x 100%

O = 63.33%

H = (0.0151 g / 0.300 g) x 100%

H = 5.03%

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To calculate the mass of C in 5.46 g of C₂H₄, we need to first find the molar mass of C₂H₄:

C₂H₄ = (2 x atomic mass of C) + (4 x atomic mass of H)

= (2 x 12.01 g/mol) + (4 x 1.01 g/mol)

= 24.02 g/mol + 4.04 g/mol

= 28.06 g/mol

Next, we can use the molar mass to find the moles of C₂H₄:

moles of C₂H₄ = mass / molar mass

= 5.46 g / 28.06 g/mol

= 0.194 moles

Since there are 2 moles of C in 1 mole of C₂H₄, we can find the moles of C:moles of C = 2 x moles of C₂H₄

= 2 x 0.194 moles

= 0.388 moles

Finally, we can use the molar mass of C to find the mass of C:

mass of C = moles of C x atomic mass of C

= 0.388 moles x 12.01 g/mol

= 4.66 g

Therefore, the mass of C in 5.46 g of C₂H₄ is approximately 4.66 g. The closest answer choice is A) 0.455 g C, which is not the correct answer.

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The burning of fossil fuels such as coal, oil, and gas releases a variety of pollutants into the air, including carbon dioxide, nitrogen oxides, sulfur dioxide, and particulate matter. The correct answer is 2.

These pollutants contribute to a range of environmental and health problems, including climate change, respiratory illness, and cardiovascular disease. While other factors such as thermal inversions and volcanic eruptions can also contribute to air pollution, they are not as significant as the ongoing combustion of fossil fuels by human activity. Addressing air pollution requires a multi-pronged approach, including transitioning to cleaner sources of energy. Hence option 2 is correct.

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--The complete Question is, Most air pollution comes from...

The substance that Channel X transmits would be the smallest substance dissolved in the extracellular fluid, which is likely to be potassium ions .

Channel X only transmits the smallest substances dissolved in the extracellular fluid through the axon membrane. . It would not be proteins as they are generally too large to be dissolved in the extracellular fluid, and sodium ions are not necessarily the smallest substance dissolved in the extracellular fluid. These channels are found in the axon membrane of neurons, and act as a gate that can open and close to allow the passage of potassium ions through the membrane. This allows the neuron to regulate the electrical potential across the membrane, and thus control the flow of electrical signals.

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A. the Krebs (citric acid) cycle.

Acetyl coenzyme A is a key molecule in the Krebs cycle, also known as the citric acid cycle. In this cycle, acetyl coenzyme A is combined with oxaloacetate to form citrate, which undergoes a series of chemical reactions that ultimately produce ATP, the energy currency of the cell. Glycolysis, electron transport, and oxidative phosphorylation are other metabolic pathways that also produce ATP but do not directly involve acetyl coenzyme A.

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The minimum chlorine residual at the extreme end of the main after standing for 24 hours when disinfecting a new or repaired main is c.) 25 mg/L.

When disinfecting a new or repaired main, the American Water Works Association (AWWA) recommends a minimum chlorine residual of 50 mg/L at the upstream end of the main and 25 mg/L at the downstream end after a contact time of 24 hours. This ensures that the disinfectant has sufficient time to reach and eliminate any bacteria or viruses that may be present in the water mains. The residual chlorine concentration is typically measured using a chlorine test kit or a chlorine analyzer.

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Unsaturated triglycerides undergo autooxidation at the double bond position of the fatty acid residue. Autooxidation is a chemical reaction that occurs when fatty acids are exposed to oxygen and results in the formation of free radicals, which can cause damage to cells and tissues.

The double bond in unsaturated fatty acids is particularly susceptible to oxidation due to its chemical structure, which makes it more reactive than saturated fatty acids. This can lead to the formation of harmful compounds such as lipid peroxides, which can contribute to various health problems.

1. Unsaturated triglycerides contain one or more double bonds in their fatty acid chains.
2. Autooxidation is a chemical reaction that occurs when the unsaturated fatty acids are exposed to oxygen.
3. The double bond position in the fatty acid residue is the most susceptible site for autooxidation.
4. As a result, the unsaturated triglycerides undergo autooxidation at the double bond position of the fatty acid residue.

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The two major differences of terrestrial planets are:

A terrestrial planet, or telluric planet, or solid planet, or rocky planet, is  described as a planet that is composed primarily of silicate rocks or metals.

Terrestrial planets are covered with solid surfaces, while the Jovian planets usually  have gaseous surfaces.

Mercury, Venus, Earth, and Mars are examples of  the terrestrial planets, while the Jovian planets are Jupiter, Saturn, Uranus, and Neptune.

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The mass of the solution is the sum of the mass of the solute (18.9 grams) and the mass of the solvent (39.5 grams), which is 58.4 grams.

Charge separation might be considered to be polarity. As a result, polar solvents are those that can solvate, or dissolve, ions, and also have the ability to separate charges.

Because of its structure, a polar solvent molecule possesses a very tiny electrical charge. Water, which contains two hydrogen atoms and an oxygen atom, is the most normal and frequent example. The two hydrogen atoms and the lone oxygen atom are at an angle. The traditional polar solvent is water. The oxygen atom has a propensity to concentrate electron density around it.

To find the mass percent of the solution, we need to divide the mass of the solute by the mass of the solution and multiply by 100.
Mass percent = (mass of solute ÷ mass of solution) x 100
Mass percent = (18.9 ÷ 58.4) x 100
Mass percent = 32.4%
Therefore, the mass percent of the solution prepared by dissolving 18.9 grams of solid into 39.5 grams of water is 32.4%.

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In a bonding molecular orbital, the electron density is located between the nuclei, which pulls the nuclei closer together and stabilizes the bond.

In a bonding molecular orbital, the electron density is located between the nuclei which pulls the nuclei towards each other. This is because the electrons are shared by the two atoms, creating a bond that allows them to be attracted to each other. The more electron density there is between the nuclei, the stronger the bond will be. This is why atoms with similar electronegativities tend to form stronger bonds, as they share electrons more equally and have more balanced electron density between them.

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0.15 g of Na₂SO₄ can be added to water and diluting to a final volume of 130.0 mL

The molarity (M) of a solution is defined as the number of moles of solute per liter of solution.

Number of moles of solute = Molarity x Volume of solution in liters

The volume of the final solution is given as 130.0 mL, which is 0.1300 L. Therefore, the number of moles of Na+ required can be calculated as:

Number of moles of Na+ = 0.016 M x 0.1300 L

Number of moles of Na+ = 0.00208 moles

Since each mole of Na₂SO₄ produces two moles of Na+, the number of moles of Na₂SO₄ required can be calculated as:

Number of moles of Na₂SO₄ = 0.00208 moles / 2

Number of moles of Na₂SO₄ = 0.00104 moles

Finally, we can calculate the mass of Na₂SO₄ required using its molar mass:

Mass of Na₂SO₄ = Number of moles x Molar mass

Mass of Na₂SO₄ = 0.00104 moles x 142 g/mol

Mass of Na₂SO₄ = 0.1477 g

Therefore, we need to add 0.1477 grams of Na₂SO₄ to water and dilute it to a final volume of 130.0 mL to prepare a 0.016 M solution of Na+.

The closest answer choice is 0.15 g.

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The hydro pneumatic tank typically contains b. 80 percent of its volume as water.

A hydro pneumatic tank is used to store water under pressure, and typically, 80 percent of its volume is filled with water. The remaining 20 percent is filled with compressed air, which helps to maintain the pressure in the tank. When the water is pumped into the tank, it compresses the air, which then acts as a cushion to maintain a constant pressure even when the water is being drawn out of the tank.

This is commonly used in water supply systems to maintain a consistent water pressure throughout the network. In addition, it can also be used in heating and cooling systems to store and circulate water. The hydro pneumatic tank is an essential component of many water systems and plays a vital role in ensuring a reliable water supply. The hydro pneumatic tank typically contains b.  80 percent of its volume as water.

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The correct answer is b. Conifer forests at high elevations are most affected by acid rain.

Acid rain is caused by emissions of sulfur dioxide and nitrogen oxide, which react with the atmosphere to form sulfuric and nitric acid. These acids can then fall to the ground as acid rain. Conifer forests at high elevations are particularly vulnerable to the effects of acid rain because the soil in these areas is often thin and lacks buffering capacity, making it more susceptible to acidification. Acidification of the soil can lead to nutrient imbalances and other negative impacts on plant health. Acid rain can damage the trees by leaching nutrients from the soil, reducing photosynthesis, and increasing the trees' susceptibility to insect and disease damage.

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Face brick differs from building brick in that it is generally C. more uniform in size and color.

answer - The correct answer is C. Face brick differs from building brick in that it is generally more uniform in size and color. Face brick is specifically designed to be aesthetically pleasing and used for facing buildings, whereas building brick is used for structural purposes. Face brick is also typically made from higher quality clay and fired at higher temperatures to ensure consistent color and durability. However, it may not necessarily be more resistant to severe weathering or harder than building brick, and may not always be available in a variety of sizes. Face bricks are specifically manufactured for their appearance and are used in visible parts of construction, whereas building bricks prioritize structural integrity.

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If ΔH < 0 and ΔS > 0, then ΔG is always negative (i.e., ΔG < 0). This indicates that the reaction is spontaneous and will proceed in the forward direction without the addition of external energy.

If ΔH > 0 and ΔS < 0, then ΔG is always positive (i.e., ΔG > 0). This indicates that the reaction is non-spontaneous in the forward direction and will only occur if energy is added to the system.

If ΔH < 0 and ΔS < 0, then ΔG is negative at lower temperatures. This indicates that the reaction is spontaneous in the forward direction at lower temperatures but may not be spontaneous at higher temperatures. This is because the negative ΔS term dominates at lower temperatures, but at higher temperatures, the positive ΔH term dominates, and the reaction becomes non-spontaneous.

The signs of ΔH and ΔS determine the spontaneity of a reaction, while the magnitude of ΔG determines the extent to which the reaction will proceed. A negative ΔG indicates that the reaction is spontaneous and will proceed to completion, while a positive ΔG indicates that the reaction is non-spontaneous and will not occur without the addition of external energy.

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As a coagulant, sodium hypochlorite would not be employed. As a result, option D is right.

In water treatment, the coagulation is very important step that involve the use of chemicals,. Sedimentation or filtration can then be used to remove the coagulated particles. In water treatment, coagulants such as black alum, chlorinated copperas, and ferric chloride are utilized.

Sodium hypochlorite, is a preferred disinfectant and not a coagulant. It is effective against germs and viruses but lacks coagulation characteristics. Option D is therefore true, and sodium hypochlorite would not be utilized as a coagulant.

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At pH 7, groups with pKa values above 7 will be deprotonated, those with pKa values below 7 will remain protonated, and those around 7 will be partially ionize.

This is due to the side chain of histidine having a pKa value of 6.0. The two acidic amino acids are aspartate and glutamate, and at a physiological pH of 7, they both contain a complete negative charge on their side chains.

Tyrosine and serine are two more amino acids that can be deprotonated at high pH levels, although they mostly reside in their protonated, neutrally charged states at physiological pH levels. Ionizable functional groups can be found in amino acids.

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The distance between the static water level and the pumping water level is termed the "drawdown". To explain, when a well is pumped, water is drawn from the surrounding aquifer causing the water level around the well to drop. The distance between the original static water level and the new water level is the drawdown. This term is important in determining the well's yield and how much water can be pumped from the well without causing significant harm to the aquifer.

The concentrations of the reactants and products at equilibrium, we can calculate Kc 2.56

Concentration is a measure of the amount of a substance within a given quantity of another substance or medium. It is usually expressed as mass per unit volume. For example, a concentration of a solute in a solution is the mass of that solute, per unit volume of the solution. Concentration is an important concept in many fields, including chemistry, physics, and biology, amongst other sciences.

The reaction that is happening is: S₂Cl₄(g) → 2SCl₂(g)
For the reactant, S₂Cl₄ at equilibrium:
Moles S₂Cl₄ = 1.25 moles
Volume = 2.0 L
Concentration = 1.25 moles / 2.0 L = 0.625 M
For the product, SCl₂ at equilibrium:
Moles SCl₂ = 2.5 moles (since 2 moles of SCl₂ are produced for every mole of S₂Cl₄)
Volume = 2.0 L
Concentration = 2.5 moles / 2.0 L = 1.25 M
Now that we have the concentrations of the reactants and products at equilibrium, we can calculate Kc.
Kc = [SCl₂]₂ / [S₂Cl₄]
Kc = (1.25 M)² / 0.625 M
Kc = 2.56

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The density of rhodium (Rh) is predicted to be approximately 15.77 g/cm³.

To predict the density of rhodium (Rh) using the given densities of cobalt (Co) and iridium (Ir):

Note the densities of cobalt and iridium
Cobalt (Co) density = 8.89 g/cm³
Iridium (Ir) density = 22.65 g/cm³

Find the average density of Co and Ir
Average density = (Density of Co + Density of Ir) / 2
Average density = (8.89 g/cm³ + 22.65 g/cm³) / 2

Calculate the average density
Average density = (31.54 g/cm³) / 2
Average density = 15.77 g/cm³

Using the average density of cobalt and iridium, we predict that the density of rhodium (Rh) is approximately 15.77 g/cm³. However, keep in mind that this is a rough estimation and the actual density of Rh may differ.

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In domestic water well supplies, the two elements cause the most hardness Ca and Mg. Option C is the correct answer.

In domestic water well supplies, the two elements that cause the most hardness are calcium (Ca) and magnesium (Mg).

Hard water is characterized by high levels of dissolved minerals, particularly calcium and magnesium ions.

These minerals can cause a variety of problems, including scaling in pipes and appliances, reduced efficiency of water heaters, and decreased effectiveness of soaps and detergents.

Zinc (Zn) and sodium (Na) are not typically associated with water hardness, although high levels of sodium can contribute to other water quality concerns. Therefore, option c, Ca and Mg, is the correct answer.

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If hard water is softened by the ion exchange method, the level of sodium (d) will increase. This is because calcium and magnesium ions in the hard water are replaced with sodium ions during the ion exchange process.

The ion exchange method for softening hard water includes swapping out the calcium and magnesium ions for sodium ions, which raises the concentration of sodium in the water. This procedure has no impact on the levels of dissolved oxygen or iron.

The correct answer is d. sodium. Softening hard water through the ion exchange method involves replacing the calcium and magnesium ions with sodium ions, which results in an increase in the level of sodium in the water. Dissolved oxygen and iron levels are not affected by this process, and P1-1 is not a relevant term for this question.

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If 2.35 grams of magnesium oxide are formed, 1.42 grams of Mg reacted in the reaction.

Magnesium oxide is a chemical compound composed of magnesium and oxygen, with the chemical formula MgO.

2 Mg(s) + O₂(g) -> 2 MgO(s)

From the equation, we can see that 2 moles of magnesium react with 1 mole of oxygen to produce 2 moles of magnesium oxide. This means that the mole ratio of magnesium to magnesium oxide is 2:2, or simply 1:1.

2.35 g MgO x (1 mol MgO/40.31 g MgO) = 0.0583 mol MgO

Since the mole ratio of Mg to MgO is 1:1, we know that 0.0583 moles of Mg also reacted. Now we can use the molar mass of Mg to calculate the mass of Mg that reacted:

0.0583 mol Mg x 24.31 g/mol = 1.42 g Mg

Therefore, 1.42 grams of Mg reacted in the reaction.

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The balanced chemical equation for the reaction described is:

[tex]2 LiOH _{(s)}+ H_2SO_4_{(aq)} - > Li_2SO_4_{(aq)} + 2 H_2O_{(l)}[/tex]

This equation shows that two moles of solid lithium hydroxide (LiOH) react with one mole of sulfuric acid to produce one mole of lithium sulfate and two moles of water.

An aqueous solution of sulfuric acid and solid lithium hydroxide pellets undergoes a chemical reaction that is represented by the above equation. Lithium sulfate and water are the results of the process.

The balanced equation's coefficients show the reaction's stoichiometry. One mole of lithium sulfate and two moles of water are created when two moles of lithium hydroxide combine with one mole of sulfuric acid. In terms of the number of moles, this indicates that the ratio of the reactants and products is 2:1:1:2, respectively.

The law of conservation of mass, which dictates that the sum of the masses of the reactants and products must be equal, is likewise observed by the balanced equation. This is accomplished by guaranteeing that each element has the same amount of atoms.

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The metal component that is protected from corrosion is called the option A: cathode.

Metal surfaces experience corrosion, an electrochemical process, when they come into contact with electrolytes. Corrosion is the process of converting a metal back to its original form as an ore; during this transformation, the metal disintegrates and loses structural integrity. Pipelines, structures, and ships all make use of these metal surfaces.

It is crucial to make sure that these metals endure as long as possible, which calls for cathode protection. Cathode is a metal rod placed in an electrolyte where oxidation takes place so that it loses electrons in the electrolyte and get oxidized. Zinc metal is generally used as a cathode electrode.

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The addition of sodium bicarbonate )will raise the pH of the solution.

Sodium bicarbonate is a basic compound that can act as a buffer and neutralize acids. When it dissolves in water, it releases bicarbonate ions and sodium ions ,which can react with acidic compounds and release hydroxide ions to increase the pH.

Therefore, the correct answer is (c) Raise the pH.

Sodium bicarbonate, also known as baking soda, is a white crystalline powder with the chemical formula. It is a common household chemical that is used for a variety of purposes, including baking, cleaning, and as an antacid to treat heartburn or indigestion.

Sodium bicarbonate is a weak base that reacts with acids to produce carbon dioxide gas, which makes it useful in baking to help dough rise. It is also effective at neutralizing acidic spills or odors, and can be used as a cleaning agent for surfaces or fabrics.

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