Calculate the mass percent of a NaCl solution prepared by mixing 21.0 g NaCl with 125.0 mL of pure water.

The percentage dissociation is 0.97% and the hydrogen ion concentration is 1.93 x 10^-3 mol/dm^3.

we need to use the equation:

Ka = [H^+][A^-] / [HA]

where Ka is the equilibrium constant, [H^+] is the hydrogen ion concentration, [A^-] is the concentration of the dissociated form of the acid (acetate ion), and [HA] is the concentration of the undissociated form of the acid (ethanoic acid).

We know the concentration of ethanoic acid, [HA] = 0.2 mol/dm^3, and the value of the equilibrium constant, Ka = 1.85 x 10^-5 mol/dm^3.

Using the equation:

Ka = [H^+][A^-] / [HA]

1.85 x 10^-5 = [H^+][A^-] / 0.2

[H^+][A^-] = 1.85 x 10^-5 * 0.2

[H^+][A^-] = 3.7 x 10^-6 mol^2/dm^6

Since the concentration of the acetate ion is equal to the concentration of the hydrogen ion, [A^-] = [H^+].

So,

[H^+]^2 = 3.7 x 10^-6 mol^2/dm^6

[H^+] = sqrt(3.7 x 10^-6) = 1.93 x 10^-3 mol/dm^3

The hydrogen ion concentration is 1.93 x 10^-3 mol/dm^3.

To find the percentage dissociation, we divide the concentration of the acetate ion by the initial concentration of ethanoic acid and multiply by 100:

Percentage dissociation = ([A^-] / [HA]) * 100

Percentage dissociation = (1.93 x 10^-3 / 0.2) * 100 = 0.97%.

Therefore, The percentage dissociation is 0.97% and the hydrogen ion concentration is 1.93 x 10^-3 mol/dm^3.

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Answer: ferrous salts

Explanation:

done

A. Neutral salts.  (7, 2), B. Acidic salts.  (4, 6), C. Basic salts. (1, 3, 5)

We must understand where the ions originate. Since they can produce hydrolysis in water if they originate from a weak acid or base, the medium is given OH and H+.

1. Li+ + F + LiF

F + H2O -> HF + OH

The hydrolysis can be produced by F, which produces OH. The elemental salt.

2. SrBr2 Sr2+ 2Br

Both are weak and incapable of hydrolyzing. The salt is impartial.

3. NH4+ + NH4CN

Given their strength, both ions can produce the hydrolysis. The problem is that although cyanide produces hydroxides, ammonium produces protons. We must contrast the Ka and Kb to assess how the salt is doing.

Ka = 5.7 1010 NH4+ + H2O NH3 + H3O+

HCN + OH + Kb = 1.61 105 from CN + H2O.

Since Kb exceeds Ka, pH is basic.

Ka > Kb would result in an acidic pH.

4. NH4Br = NH4+ Br

Br doesn't hydrolate. Since the ammonium cation combines with water to release protons into the medium, the salt will be acidic.

Ka = NH3 + H3O + NH4+ + H2O

5. K+ + CN + KCN

Hydrolization of K+ is not possible. The salt will be basic because the cyanide anion reacts in water to produce hydroxides for the medium.

OH + OH Kb = HCN + OH Kb CN + H2O

NH4ClO4 = NH4+ + ClO4

Perchloric acid is the source of ClO4 (a strong acid). No hydrolysis occurs.

Ka = NH3 + H3O + NH4+ + H2O

The medium receives H+ from ammonium, making the acidic salts.

7. LiNO3 Li+ + NO3

Hydrolysis cannot be produced by both ions. They are the result of a strong base and a strong acid, so

Identify the following salts as neutral, acidic, or basic. Drag each item to the appropriate bin.

1. LiF

2. SrBr2

3. NH4CN

4. NH4Br

5. KCN

6. NH4ClO4

7. LiNO3

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Answer:

ions with opposite charge

Explanation:

ionic bond is formed between oppositely charged ions in a chemical compound.

Answer: ions with opposite charges

Explanation:

The order of decreasing radius for the given ions can be determined by considering their electronic configurations and the effects of nuclear charge and shielding on atomic size.

Let's start with the largest ion. Selenium (Se) belongs to Group 16 of the periodic table and has 6 valence electrons. It is larger than the other ions because it has more electron-electron repulsions, causing the electron cloud to spread out further. Thus, Se is expected to have the largest radius.

Next, we have iodide ion (I-). Iodine (I) is in Group 17 and has 7 valence electrons. By gaining an electron to achieve a stable octet configuration, it becomes negatively charged as an ion. The additional electron increases the electron-electron repulsions, causing the ion to expand its electron cloud. Therefore, I- is larger than Se.

Moving on, we have lithium ion (Li+). Lithium (Li) is in Group 1 and has 3 valence electrons. When it loses one electron to form a cation, the ion's electron cloud contracts. The nuclear charge, which remains the same, attracts the remaining electrons more strongly, resulting in a smaller ionic radius compared to neutral lithium. Therefore, Li+ is smaller than Se and I-.

Finally, we have bromine ion (Br-). Bromine (Br) is in Group 17 and has 7 valence electrons. When it gains an electron to achieve a stable octet, it becomes negatively charged as an ion. Similar to I-, the additional electron causes the electron cloud to expand, leading to a larger ionic radius. Therefore, Br- is expected to have the smallest radius among the given ions.

In summary, the expected order of decreasing radius for the given ions is:

Se > I- > Li+ > Br-

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Answer: Id answer it but i think your copy and paste got corrupted!

Explanation:

59.78175 kPa is the pressure inside the container when a cylinder at 48.0 atm pressure and 17.0°C releases 35.0 mL of carbon dioxide gas into a 4.00 L container at 24.0°C.

An ideal gas equation states the relationship between the moles of the substance, temperature, pressure, and volume. The ideal gas equation is given as, PV=nRT

Given data:

\(P_1\)=48.0 atm

\(V_1\)=3T_1=17.0°C

\(P_2\)=?

\(V_2\)=4.00 L

\(T_2\)=24.0°C

\(\frac{P_1V_1}{T_1}\) = \(\frac{P_2V_2}{T_2}\)

\(\frac{48.0 atm X 35.0 mL}{17.0} = \frac{P_2X 4000 ml L}{24.0}\)

\(P_2\)= 0.59 atm = 59.78175 kPa

Hence, 59.78175 kPa is the pressure inside the container when a cylinder at 48.0 atm pressure and 17.0°C releases 35.0 mL of carbon dioxide gas into a 4.00 L container at 24.0°C.

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Answer: write the solubility equilibrium and the solubility-product constant expression for the slightly soluble salt CaF2 CaF2 (s) <---> Ca2+ (aq) + 2F- (aq) Ksp=[Ca2+][F-]2.

Explanation:

Fatty acid groups are referred to as B) acyl groups.

Fatty acids are organic compounds that consist of a long hydrocarbon chain with a carboxyl group (-COOH) at one end. The hydrocarbon chain is composed of carbon and hydrogen atoms, and its length can vary. Fatty acids play essential roles in various biological processes and are major components of lipids, including triglycerides and phospholipids.

When a fatty acid is involved in chemical reactions or is attached to other molecules, it typically undergoes a process called activation, where it is converted into an acyl group. An acyl group is formed by replacing the -OH (hydroxyl) group of the carboxyl group with an -OR (alkoxy) group. The -OR group can be derived from various molecules, such as coenzyme A (CoA) or other acyl carrier proteins.

For example, when a fatty acid is activated for incorporation into a triglyceride molecule, it forms a triglyceride acyl group. Similarly, when a fatty acid is incorporated into a phospholipid molecule, it forms a phospholipid acyl group. The acyl group represents the hydrocarbon chain of the fatty acid, which may vary in length and saturation.

Therefore, the correct answer to the question is B) Acyl.

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Explanation:

350 g  *  25 C  * .39 J / (g C) = ~ 3400 J

The number of moles in 15.0 g of Aluminum having an atomic mass of       27 g/mol is 0.556 mol.

Now,

we know that,

number of moles = given mass/molar mass

And, the molar mass of Aluminum is 27 units.

so,

number of moles = 15.0 / 27

                            = 0.556

hence , 0.556 moles are in 15.0 g of Aluminum.

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Answer:

B. 1-heptene

Explanation:

The 1-HEPTENE molecule contains a total of 20 bond(s) There are 6 non-H bond(s), 1 multiple bond(s), 4 rotatable bond(s) and 1 double bond(s).

Answer:

B

Explanation:

you start from the double bond for naming of hydrocarbons, ethene has double bond has its characteristics, we have seven chains, so the answer is 1-heptene

Answer:

4 liters brainliest Idc rn

Explanation:

jk but enjoy kiddos :(

Answer:

4 liters

Explanation:

In order to get the answer you just need to multiply the volume amount by 100.

\(0.01 \times 100 = 1\)

0.01HL = 1 L

0.01 4HL = 4L

= 4 liters

Hope this helps.

EXPLANATION:

Ethanol is commonly known as ethyl alcohol, pure alcohol, grain alcohol, and most importantly it is known alcohol present in alcoholic beverages.

The chemical formula of ethanol is written below as

Ethanol is very soluble in water and also, it has many functions due to the presence of hydroxyl as the functional group.

The next thing is to draw the structure of ethanol

Ethanol act as a fuel because the ethanol molecule contains oxygen, it allows the engine to more completely combust the fuel.

Answer:

Jack Frost of course!!!!!!!

the splitting of the uranium atom is called nuclear fission.

Fission occurs when a neutron slams into a larger atom, forcing it to excite and split into two smaller atoms also known as fission products. Additional neutrons are also released that can initiate a chain reaction. When each atom splits, a tremendous amount of energy is released.

Nuclear fission is more dangerous than fusion as it produces harmful weapons-grade radioactive waste in the fuel rods that need to be stored safely away for thousands of years.

Fission is the splitting of a heavy, unstable nucleus into two lighter nuclei, and fusion is the process where two light nuclei combine together releasing vast amounts of energy. While different, the two processes have an important role in the past, present and future of energy creation.

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The approximate radius of a 12 Cd nucleus is 2.75 femtometers (fm).

The radius of a nucleus can be estimated using the empirical formula given below:

R = r₀ × A¹⁾³

R is the radius of the nucleus,

r₀ is a constant,

A is the mass number (the number of protons and neutrons) of the nucleus.

For a 12 Cd nucleus, A = 12 (the mass number of Cadmium).

The constant r₀ is approximately 1.2 femtometers (1.2 fm).

Now, substituting the values into the formula:

R = (1.2 fm) × (12)¹⁾³

R = 1.2 fm × 2.29

R = 2.75 fm

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Answer:

saturated solution

Explanation:

hope this helps!

Answer:

it would be saturated

Explanation:

because there is to much of the solute

Answer: the type of apple because it is an example of a constant

Explanation:

Answer:

Covalent bonding between oxygen and hydrogen within water molecules.

To make a 48% solution from 25 g of solute, you would need approximately 52.08 mL of solvent.

To calculate the volume of solvent required, we need to consider the mass percent of the solution. The mass percent is defined as the ratio of the mass of solute to the total mass of the solution, multiplied by 100. In this case, the mass percent is given as 48%.

To find the volume of solvent, we can set up a proportion using the mass percent. Let's assume the total volume of the solution is V mL. We can set up the following equation:

(25 g)/(V mL) = (48 g)/(100 mL)

Cross-multiplying and solving for V, we get:

25V = 48 * 100

V = (48 * 100)/25

V ≈ 192 mL

Therefore, you would need approximately 192 mL of the solvent to make a 48% solution from 25 g of solute.

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Answer:

Explanation:

Groundwater spread over the years

Answer:

A calorimeter is an object used for calorimetry, or the process of measuring the heat of chemical reactions or physical changes as well as heat capacity. Differential scanning calorimeters, isothermal micro calorimeters, titration calorimeters and accelerated rate calorimeters are among the most common types.

Explanation:

Explanation:

An apparatus for measuring the heat generated or absorbed by either a chemical reaction, change of phase or some other physical change is a calorimeter.

Hope it will help :)❤

Answer:

There are 3 significant figures.

Explanation:

Significant figures:

All non-zero digits are consider significant figures like 1, 2, 3, 4, 5, 6, 7, 8, 9.

Leading zeros are not consider as a significant figures. e.g. 0.03 in this number only one significant figure present which is 3.

Zero between the non zero digits are consider significant like 104 consist of three significant figures.

The zeros at the right side e.g 2400 are also significant. There are four significant figures are present.

The number such as 10³ are not consider as significant. for example 1.23× 10² in this number there are only 3 significant number.

In given measurement:

3.57 × 10⁹

There are three significant figures.

Answer:

D. A force acting between the atoms within a molecule.

Both molecular and covalent network solids exhibit covalent bonding. Weak intermolecular interactions keep the molecules in molecular solids together.

When two atoms share an electron pair, an interatomic interaction known as a covalent bond is formed. The binding is brought about by the electrical attraction of their nuclei to the same electrons. A covalent bond is formed when the combined energy of the bonded atoms is lower than the energy of the unbonded atoms.

The identical electron pair of the covalent connection pulls the two hydrogen atoms in. The bond is shown as either a solid line or two "dots." Every hydrogen atom acquires an electron arrangement resembling that of helium. The bond length is the separation between atomic nuclei at equilibrium.

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(a) The [Co2+] in the solution is approximately 1.17 × 10^(-3) M. (b) The number of moles of Co2+(aq) in the 50.00 mL solution is approximately 5.85 × 10^(-5) mol. (c) The mass percent of Co in the 0.630 g sample of the ore is approximately 2.94%.

The absorbance of a sample is related to the concentration of the absorbing species using the Beer-Lambert Law. The equation for the Beer-Lambert Law is A = εbc, where A is the absorbance, ε is the molar absorptivity (a constant specific to the absorbing species), b is the path length of the cuvette (usually 1 cm), and c is the concentration of the absorbing species. Rearranging the equation to solve for concentration, we have c = A/(εb).

Given that the absorbance (A) is 0.74, the path length (b) is 1 cm, and the molar absorptivity (ε) is specific to the Co2+ species, we can calculate the concentration (c).

To calculate the number of moles of Co2+(aq) in the solution, we use the formula n = c × V, where n is the number of moles, c is the concentration in moles per liter, and V is the volume in liters. Given that the concentration of Co2+(aq) is 1.17 × 10^(-3) M and the volume is 50.00 mL (which is equivalent to 0.05000 L), we can calculate the number of moles.

To calculate the mass percent, we use the formula mass percent = (mass of Co/mass of sample) × 100. Given that the mass of the Co in the sample is equal to the molar mass of Co multiplied by the number of moles calculated in part (b), we can calculate the mass percent of Co in the ore sample.

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Answer:

um Im not sure what the heck that is

Answer:

Earth

Strongest

Moon

Gravitational

Tide

Pulls

Bulge

Waves

Proximity

Low Tide

Answer:

metallic bond

Explanation:

Metallic bonds are the attraction between a positive metal ion and the electrons surrounding them.

This bond is found in metals and their alloys. They are interatomic forces.