the oxygen portion of several water molecules surround an ion. what does this tell you about the ion's charge?

Answer:

"Forensic science is a critical element of the criminal justice system. Forensic scientists examine and analyze evidence from crime scenes and elsewhere to develop objective findings that can assist in the investigation and prosecution of perpetrators of crime or absolve an innocent person from suspicion."

Explanation:

Strictly from: https://www.justice.gov/olp/forensic-science#:~:text=Forensic%20science%20is%20a%20critical,an%20innocent%20person%20from%20suspicion.

Forensic science is any science used to aid in a criminal/legal investigation

Answer: molecule of the kind normally found in living systems. Organic molecules are usually composed of carbon atoms in rings or long chains, to which are attached other atoms of such elements as hydrogen, oxygen, and nitrogen.

Explanation:

In the given molecule, the functional group present is the carboxyl group. In the carboxyl group, the carbon atom is also bonded to another oxygen atom through a single bond. This oxygen atom has a negative charge and is responsible for the acidity of carboxylic acids.


The carboxyl group is composed of a carbon atom double-bonded to an oxygen atom and single-bonded to a hydroxyl group (-OH). It is commonly found in organic compounds known as carboxylic acids, which are characterized by their ability to donate a proton and act as an acid.

To identify the carboxyl group in a molecule, you can look for the presence of a carbon atom double-bonded to an oxygen atom and single-bonded to a hydroxyl group (-OH). In the given molecule, the carboxyl group is not explicitly described, so we cannot determine its exact structure. Therefore, the correct answer to the question is (b) carboxyl.

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A strong force - called the strong nuclear force - holds protons and neutrons together in the nucleus.

Sulfurous acid is a weak acid with the molecular formula H2SO3. It has two acidic hydrogen atoms, which can be sequentially neutralized. The successive neutralizations of each acidic hydrogen of sulfurous acid are as follows:

First acidic hydrogen: H2SO3 + NaOH → NaHSO3 + H2O

The molecular equation is H2SO3 + 2NaOH → Na2SO3 + 2H2O

The net ionic equation is H2SO3 + 2OH- → SO32- + 2H2O

Second acidic hydrogen: NaHSO3 + NaOH → Na2SO3 + H2O

The molecular equation is HHSO3 + NaOH → Na2SO3 + H2O

The net ionic equation is HSO3- + OH- → SO32- + H2O

Overall reaction: H2SO3 + 2NaOH → Na2SO3 + 2H2O

The molecular equation for the overall reaction is H2SO3 + 2NaOH → Na2SO3 + 2H2O

The net ionic equation for the overall reaction is H2SO3 + 2OH- → SO32- + 2H2O

In summary, the molecular and net ionic equations for the successive neutralizations of each acidic hydrogen of sulfurous acid are given above.

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To calculate the theoretical yield of potassium alum, we need to determine the number of moles of aluminum present in the 1.16 g sample and then use the stoichiometry of the reaction to find the corresponding number of moles of potassium alum.

Therefore, the theoretical yield of potassium alum that could be obtained in the reaction is approximately 10.23 grams.

First, we calculate the number of moles of aluminum using its molar mass:

Number of moles of aluminum = Mass of aluminum / Molar mass of aluminum

= 1.16 g / 26.98 g/mol (molar mass of aluminum)

≈ 0.043 moles

Next, we use the balanced chemical equation for the reaction between aluminum and potassium alum to find the mole ratio between aluminum and potassium alum. The balanced equation is:

2 Al + K2SO4 · Al2(SO4)3 + K2SO4

From the balanced equation, we see that 2 moles of aluminum react to form 1 mole of potassium alum.

Therefore, the theoretical yield of potassium alum is:

Theoretical yield = Number of moles of aluminum * (1 mole of potassium alum / 2 moles of aluminum)

= 0.043 moles * (1 mole / 2 moles)

= 0.0215 moles

Finally, we convert the number of moles of potassium alum to grams using its molar mass:

Theoretical yield in grams = Theoretical yield in moles * Molar mass of potassium alum

= 0.0215 moles * 474.39 g/mol (molar mass of potassium alum)

≈ 10.23 g

Therefore, the theoretical yield of potassium alum that could be obtained in the reaction is approximately 10.23 grams.

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Answer: A the kinetic energy is transformed into heat

Explanation:

Answer:

See below.

Explanation:

Since energy is released when bonds form, the process of burning food can be explained through exothermic reactions. We use food as a resource to obtain energy through calories, where the chemicals that makeup food result in endothermic reactions to fulfill our dietary needs. As a result, that energy MUST be released since energy can neither be created nor destroyed. Therefore, it must come out as the bonds are broken (usually hydrogen bonds during the process of cellular respiration). While calories are being burned, energy is released, causing bonds to break and resulting in exothermic reactions.

Answer:

Her speed is 6.8m/s.

Explanation:

K.E= 1/2mv²

or, 2543.2= 1/2×110×v²

or, 2543.2 = 55v²

or, 2543.2/55 = v²

or, 46.24 = v²

or, 6.8² = v²

v = 6.8 m/s

answer

6.8

explanation

k.e=1/2v^2

2543.2=55v^2

46.24=v^2

6.8^2=v^2

v=6.8

Answer:

133.333333333 cm^3

Explanation:

Volume = Mass/Density

The concentration of acetic acid in the vinegar sample is 3.30 M.

In this titration problem, we can use the balanced chemical equation for the reaction between acetic acid and sodium hydroxide:

CH3COOH (acetic acid) + NaOH (sodium hydroxide) → CH3COONa (sodium acetate) + H2O (water)

From the equation, we can see that the stoichiometric ratio of acetic acid to sodium hydroxide is 1:1. This means that the number of moles of sodium hydroxide used in the titration is equal to the number of moles of acetic acid in the vinegar sample.

We can start by calculating the number of moles of sodium hydroxide used:

n(NaOH) = M(NaOH) x V(NaOH)

n(NaOH) = 0.596 mol/L x 25.5 mL / 1000 mL/L

n(NaOH) = 0.0152 mol

Since the stoichiometric ratio of acetic acid to sodium hydroxide is 1:1, the number of moles of acetic acid in the vinegar sample is also 0.0152 mol.

Now we can calculate the concentration of acetic acid in the vinegar sample:

M(CH3COOH) = n(CH3COOH) / V(CH3COOH)

We have the number of moles of acetic acid, but we need to calculate the volume of the vinegar sample used in the titration. Since we know the initial volume of the vinegar sample (30.1 mL), we can use the volume of sodium hydroxide used (25.5 mL) to calculate the volume of acetic acid in the vinegar sample:

V(CH3COOH) = V(titrant) - V(NaOH)

V(CH3COOH) = 30.1 mL - 25.5 mL

V(CH3COOH) = 4.6 mL

Now we can calculate the concentration of acetic acid in the vinegar sample:

M(CH3COOH) = 0.0152 mol / 4.6 mL / 1000 mL/L

M(CH3COOH) = 3.30 mol/L

Therefore, the concentration of acetic acid in the vinegar sample is 3.30 M.

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Answer:

a. pH = 2.22.

b. [H+] = 2.588 x 10⁻⁴ mol/L.

Explanation:

Acids and Bases => Calculating pH of Acids and Bases.

As we saw before, the formulas to find the pH based on the hydrogen ion concentration [H+], and to find the hydrogen ion concentration [H+] based on the pH are the following, respectively:

So let's see each case:

a. To find the pH of an H+ concentration of 6.02 x 10⁻³ mol/L we use the pH formula:

The answer would be that the pH is 2.22.

b. To find the H+ concentration of a pH of 3.587, we use the [H+] formula:

The answer would be that the hydrogen ion concentration [H+] = 2.588 x 10⁻⁴ mol/L.

Answer:

The concentration of the solution is 5.8168 × \(10^{-4}\) mol.\(dm^{-3}\)

Explanation:

Here, we want to calculate the concentration of the solution.

The unit of this is mol/dm^3

So the first thing to do here is to calculate the number of moles of the solute present, which is the number of moles of AlCO3

The number of moles = mass/molar mass

molar mass of AlCO3 = 27 + 12 + 3(16)  = 27 + 12 + 48 = 87g/mol

Number of moles = 33.4/87 = 0.384 moles

This 0.384 moles is present in 660 L

x moles will be present in 1 dm^3

Recall 1 dm^3 = 1L

x * 660 = 0.384 * 1

x = 0.384/660 = 0.00058168 = 5.8168 * 10^-4 mol/dm^3

The correct answers are b. a solution of your isolated product and d. a solution of your starting alcohol will be added for the bayer test, if we add a solution of potassium permanganate.

The Bayer test is utilized to recognize the presence of alcohols or phenols in a given example. The test includes adding an answer of potassium permanganate (KMnO4) to an example containing the liquor or phenol. On the off chance that a liquor or phenol is available, the purple shade of the KMnO4 arrangement will blur as it is decreased to MnO2. This response happens because of the presence of a receptive hydroxyl bunch in the liquor or phenol. The test can be performed on the beginning liquor and on the detached item after the response is finished to affirm the presence of the ideal item.

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Answer:

The answer is A please mark brainliest

Explanation:

Answer:

False

Explanation:

Answer:

To prepare a 0.5M 500cm^3 solution of MgSO4 from a 2.5M stock solution of MgSO4, you can use the following formula:

C1V1 = C2V2

where C1 is the concentration of the stock solution, V1 is the volume of the stock solution needed, C2 is the desired concentration of the final solution, and V2 is the final volume of the solution.

Rearranging the formula, we get:

V1 = (C2 x V2)/C1

Substituting the values we have:

V1 = (0.5 x 0.5)/2.5 = 0.1 L = 100 mL

This means we need 100 mL of the stock solution to prepare the final solution. To prepare the final solution, we can use a volumetric flask and add 100 mL of the stock solution to it. We can then add distilled water to the flask until the volume reaches 500 mL, giving us a 0.5M 500cm^3 solution of MgSO4.

Answer:

B 2:2

Explanation:

Mole ratio is the comparison of the ratio of two compounds or elements in a chemical reaction. In a balanced equation, the moles of a particular compound or element is written as a coefficient. This means that mole ratio is the ratio of the coefficient of two substances in a reaction.

In this balanced chemical equation given as follows:

2CO + 02 → 2CO2

The number of moles/coefficient of carbon monoxide (CO) is 2 while that of carbon dioxide (CO2) is 2.

Hence, the mole ratio of CO to CO2 is 2:2

She is referring to the law of superposition

The law of superposition is a principle in relative dating that states that in a sequence of undisturbed sedimentary rocks or strata, the oldest layer is at the bottom, and the youngest layer is at the top. This principle is based on the observation that sedimentary rocks are typically formed in horizontal layers, with each layer being deposited on top of the previous layer.

The law of superposition is one of the fundamental principles of stratigraphy, which is the study of the Earth's layers and their relationships to each other. By using this principle, geologists can determine the relative ages of rocks and fossils, even if they have been displaced or eroded.

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The products formed from the reaction of halogenoalkanes and ethanolic aqueous silver nitrate are silver halides and nitrated alkanes.

Alkanes that have one or more halogen substituents are known as haloalkanes or halogenoalkanes. Though it isn't generally noted, they are a subset of the larger class of halocarbons. Commercially, haloalkanes are frequently used.

A solution of silver nitrate is used to determine the halogen present in a haloalkane.

The products of the reaction are precipitates of silver halides and nitrated alkanes.

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The pH of the buffer solution is 7.54. The correct answer is (C) 7.54.

What is Buffer Solution?

A buffer solution is a solution that resists changes in pH when small amounts of an acid or a base are added to it. Buffer solutions are important in many chemical and biological systems because they help maintain a stable pH environment.

To calculate the pH of the buffer solution, we can use the Henderson-Hasselbalch equation:

pH = pKa + log([A^-]/[HA])

Where pKa is the dissociation constant of the weak acid (HClO), [A^-] is the concentration of the conjugate base (ClO^-), and [HA] is the concentration of the weak acid (HClO).

In this case, the weak acid is HClO, and its conjugate base is ClO^-. The dissociation constant of HClO (K_a) is given as 2.9 × 10^-8.

So, we can plug in the values:

pH = pKa + log([A^-]/[HA])

pH = -log(2.9 × 10^-8) + log(0.059/0.94)

pH = 7.54

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To determine the equilibrium constant (K) corresponding to the given standard Gibbs free energy change (ΔG°), we can use the relationship.

ΔG° = -RT ln(K) Where:

ΔG° is the standard Gibbs free energy change

R is the ideal gas constant (1.987 cal/mol K)

T is the temperature in Kelvin

In this case, ΔG° is given as -5.00 kcal/mol, and we need to convert it to cal/mol:

ΔG° = -5.00 kcal/mol × 1000 cal/kcal = -5000 cal/mol

Plugging in the values into the equation, we have: -5000 cal/mol = -1.987 cal/mol K × T × ln(K)

Now, we can rearrange the equation to solve for ln(K):

ln(K) = -5000 cal/mol / (-1.987 cal/mol K × T)

Substituting T = 298 K (assuming room temperature), we get:

ln(K) = -5000 cal/mol / (-1.987 cal/mol K × 298 K) ≈ 8.349

To find K, we need to exponentiate both sides:

K = e^(ln(K)) = e^8.349 ≈ 42929.48

Therefore, the corresponding equilibrium constant at R = 1.987 cal/mol K is approximately 42929.48.

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True. Mixing aqueous solutions of Na2S (sodium sulfide) and MgCl2 (magnesium chloride) will result in the formation of a solid precipitate, which is MgS (magnesium sulfide).

This is because the reaction between Na2S and MgCl2 produces MgS, which is insoluble in water and forms a solid precipitate. The balanced chemical equation for the reaction is:

Na2S (aq) + MgCl2 (aq) → MgS (s) + 2 NaCl (aq)

So, the net ionic equation for the reaction is:

Mg2+ (aq) + S2- (aq) → MgS (s)

Therefore, a solid precipitate of MgS will be formed when aqueous solutions of Na2S and MgCl2 are mixed.

When Na2S and MgCl2 are mixed in water, they dissolve and dissociate into their respective ions, which are Na+, S2-, Mg2+, and Cl-. The Na+ and Cl- ions remain in solution as they do not react with each other. However, the Mg2+ and S2- ions react to form a precipitate of MgS because magnesium sulfide is insoluble in water.

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Answer:

Because matter cannot be destroyed or created, It can change form through physical, chemical changes but the matter never gets destroyed or created.

Explanation:

Answer:

It consist of glucose. To be specific, it had two molecules of glucose known as benzaldehyde and hydrocyanic acid.

Explanation:

Amygdalin is a white, bitter-tasting, water-soluble, glyosidic power, C20H27NO11, usually obtained from bitter almond seeds and the leaves of plants of the genus Prunus and related genera: used chiefly in medicine as an expectorant.  

Now let's go onto the others.

Glucose is a sugar, C6H12O6, having several optically different forms, the common dextrorotatory form (dextroglucose, or -glucose) occurring in many fruits, animal tissues and fluids, etc., and having a sweetness about one half that of ordinary sugar, and the rare levorotatory from (laevoglucose, or -glucose) not naturally occurring.

The benzaldehyde molecule contains a total of 14 atom(s). There are 6 Hydrogen atom(s), 7 Carbon atom(s) and 1 Oxygen atom(s) A chemical formula of benzaldehyde can therefore be written as:C7H6O.

A solution of hydrogen cyanide in water, represented as HCN, is called hydrocyanic acid. Hydrogen cyanide is a colorless, poisonous bas, HCN, having a bitter almond like odor: in aqueous solution it forms hydrocyanic acid.

Thank you,

Eddie

Answer: 154.996 g/mol

Explanation:

The reaction between quicklime (calcium oxide, CaO) and water (H2O) to form hydrated lime (calcium hydroxide, Ca(OH)2) is an exothermic reaction.

It releases heat energy, which is why we feel hot when touching the container in which the reaction occurs.

The balanced chemical equation for this reaction can be written as follows:

CaO + H2O → Ca(OH)2

In this equation, one molecule of quicklime (CaO) reacts with one molecule of water (H2O) to produce one molecule of hydrated lime (Ca(OH)2).

The reaction proceeds as follows:

CaO + H2O → Ca(OH)2

Calcium oxide (CaO) is a strong base and reacts with water to form calcium hydroxide (Ca(OH)2). The reaction involves the transfer of hydroxide ions (OH-) from water to calcium oxide, resulting in the formation of calcium hydroxide.

During this process, energy is released in the form of heat. The exothermic nature of the reaction is due to the high enthalpy change associated with the formation of the calcium hydroxide product. The release of heat energy is what causes the container to feel hot when we touch it.

This exothermic reaction is commonly used in various applications, such as in construction materials, agriculture, and water treatment. The heat released during the reaction helps in the curing and hardening of materials and facilitates the production of hydrated lime for various industrial purposes.

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The statement that best explains how to determine which wavelength corresponds to each transition is: "The shorter the wavelength, the greater the energy of the photon. Therefore, the 486 nm wavelength corresponds to the n = 4 to n = 2 transition, and the 656 nm wavelength corresponds to the n = 3 to n = 2 transition."

This is because shorter wavelengths have higher frequencies and energy, and correspond to transitions with larger energy differences between the energy levels involved.

" The longer the wavelength, the lower the energy of the photon. Therefore, the 486 nm wavelength corresponds to the n= 3 ton = 2 transition, and the 656 nm wavelength corresponds to the n = 4 to n = 2 transition. " is therefore incorrect.

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