Use the molar solubility 3.27 * 10-11 M in pure water to calculate Ksp for NiS

Answer:9.18 m/s

Explanation:

The average speed for the entire trip is found ......total distance/total time. Remember r*t=d, so divide both sides by t and get r = d/t.

So the cyclist went 800+500+1200 m = 2500 m for total distance.

10t =800 leads to t=80 sec

5t=500 leads to t=100 sec

13t = 1200 leads to t = 92.3 sec

total time is 272.3 sec

Average speed for the entire trip is 2500 / 272.3 = 9.18 m/s

Answer:

Brainliest pls

Explanation:

shows the three main types of evolution: divergent, convergent, and parallel evolution.

Divergent: tending to be different or develop in different directions.

Convergent: coming closer together, especially in characteristics or ideas.

Parallel evolution:  implies that two or more lineages have changed in similar ways

Answer:

FeCl3 + 3NH4OH ---> Fe(OH)3 + 3NH4Cl

Explanation:

Just make sure that both sides are equal

FeCl3 + 3NH4OH ---> Fe(OH)3 + 3NH4Cl

Answer:

Explanation:

- 3 - 3

Electrochemical impedance spectroscopy is applied to study the behavior of the ferri/ferrocyanide redox couple and lithium-ion battery systems using a square wave signal input.

Electrochemical impedance spectroscopy (EIS) is a powerful technique used in electrochemistry to investigate the electrical properties and processes occurring at electrode-electrolyte interfaces. It involves the application of a small amplitude sinusoidal voltage or current perturbation to the system and measuring the resulting impedance response.

In the context of the ferri/ferrocyanide redox couple, EIS can provide valuable information about the charge transfer kinetics, diffusion processes, and overall electrochemical behavior of the system. By analyzing the impedance spectra obtained from the redox couple, parameters such as charge transfer resistance, double-layer capacitance, and diffusion coefficients can be determined. These parameters offer insights into the reaction mechanism and kinetics of the redox process.

Similarly, in lithium-ion battery systems, EIS is a widely used technique for characterizing their electrochemical performance. By applying a square wave signal input, EIS can probe various aspects of battery behavior, including interfacial processes, ion transport, and electrode kinetics. The impedance spectra obtained can provide information about the battery's capacity, state of charge, electrolyte resistance, and electrode/electrolyte interface properties. This information is crucial for understanding and optimizing battery performance, as well as diagnosing issues such as electrode degradation or electrolyte degradation.

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The substance that contains the greatest amount (in moles) of carbon atoms per mole of compound is benzoyl peroxide (\(C_1_4H_1_0O_4).\)

Option D is correct

We analyze each substance by:

A. Aspirin (C9H8O4)

Molar mass of carbon (C) = 12.01 g/mol

Number of moles of carbon atoms in aspirin = 9

Caffeine (C8H10N4O2)

Molar mass of carbon (C) = 12.01 g/mol

Number of moles of carbon atoms in caffeine = 8

Saccharin (C7H5NO3S)

Molar mass of carbon (C) = 12.01 g/mol

Number of moles of carbon atoms in saccharin = 7

. Benzoyl peroxide (C14H10O4)

Molar mass of carbon (C) = 12.01 g/mol

Number of moles of carbon atoms in benzoyl peroxide = 14

Carbon tetrachloride (CCl4)

Molar mass of carbon (C) = 12.01 g/mol

Number of moles of carbon atoms in carbon tetrachloride = 1

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The final composition of the resulting solution of 10^-2 M NH4Cl and NaHS will have a pH of 9.36.

We are given the concentration of NH4Cl and NaHS as 10^-2 M.The ammonium ion (NH4+) will undergo hydrolysis in water and form NH3 and H+.NH4+ + H2O ⇌ NH3 + H+ (acid-base reaction)The reaction shows that the ammonium ion is an acid and will produce hydrogen ions in an aqueous solution.On the other hand, sodium hydrogen sulfide (NaHS) is a weak base and undergoes hydrolysis in an aqueous solution.NaHS + H2O ⇌ NaOH + H2SThe equation shows that hydrogen sulfide (HS-) is a weak acid and will produce hydroxide ions in an aqueous solution.The hydrolysis reactions of the two salts lead to an increase in hydroxide ions (OH-) in the solution, leading to a basic solution.

We can calculate the pH of the solution using the Kb values of NaHS and the Ka value of NH4+.NH4+ + H2O ⇌ NH3 + H+Ka = [NH3][H+]/[NH4+]Kb = [HS-][OH-]/[NaHS]We can assume the concentrations of NH3 and HS- to be the same, let's assume it is x, then the equilibrium constant can be expressed as:Kw = Ka × Kb[H+][OH-] = Ka × Kb[H+][OH-] = (1.8 × 10^-5) × (1.2 × 10^-13) = 2.16 × 10^-18pH + pOH = 14pH + pOH = 14pH = 14 - pOHpOH = -log[OH-] = -log(1.47 × 10^-8) = 7.83pH = 14 - 7.83 = 6.17We can conclude that the pH of the resulting solution will be 9.36 and the final composition of the resulting solution of 10^-2 M NH4Cl and NaHS will be basic.

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Answer:

3.6  moles

Explanation: i got that quistion right .

Answer:

To convert ppm to mass percent we just need to divide ppm value by 10000.

So, \(114 ppm = \frac{114}{10000} \\=0.0114%\)

What does ppm mean?

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Answer:

CATION

Explanation:

If an atom has an equal number of protons and electrons, its net charge is 0. If it gains an extra electron, it becomes negatively charged and is known as an anion. If it loses an electron, it becomes positively charged and is known as a cation.

The Analysis of how the movement of thermal energy to equilibrium can be likened to the movement of an animal can be seen in Tendency towards equilibrium which is the way animal can stabilize their body emperature in the process known Endotherms.

It shuld be note that Many animals use behavior to control their body temperature, which could be seen in the process of seeking out sunlight or shade or huddling together for warmth.

Endotherms can modify their metabolic heat output to regulate their body temperature by shivering or not.

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The % v/v of alcohol in the solution is 30%.

To determine the volume/volume percent (% v/v) of alcohol in the solution, we need to calculate the ratio of the volume of alcohol to the total volume of the solution and then express it as a percentage.

Given:

Volume of alcohol = 15.0 mL

Total volume of the solution = 50.0 mL

% v/v of alcohol = (Volume of alcohol / Total volume of the solution) * 100

Substituting the given values into the formula:

% v/v of alcohol = (15.0 mL / 50.0 mL) * 100

Simplifying the expression:

% v/v of alcohol = 0.3 * 100

% v/v of alcohol = 30%

Therefore, the % v/v of alcohol in the solution is 30%.

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Explanation:

it will have 9 electrons because atomic number is equals to number of protons and number of protons is equal to number of electrons in an atom

mark me as brainliest kindly if you find this answer perfect

Answer: A cation

Explanation:

Answer:

I would guess that a polar air mask would be freezing, high winds type weather. I think that's right.

Answer:

Cool and dry

Explanation:

Exactly what it is on Edge

I know I am late to answer but for the points and for the people that need it

Answer:

Explanation:

Molecular weight of Al: 27

Molecular weight of O: 16

Percentage composition of Al by weight in Al2O3

= (27*2) / (27*2 + 16*3)

= 0.5294

In 200 grams of Al2O3, there are

= 200*0.5294

= 105.88 grams of Al

77.18 grams of Al was produced in the experiment.

Percent yield for the experiment

= product mass / reactant mass * 100%

= 77.18 / 105.88 * 100%

= 72.89%

Answer:

hello ~~

look nucleus is mixture of neutrons and protons.. right?

and we know neutrons have no charge and protons are positively charged so overall charge of nucleus is positive

Answer:

A

Explanation:

Because the Bohr model explains the Conteplation of the Atom which consedes to the answer explaing the neutrons and electrons have a relation which makes A right.

The study of chemicals and the arrangement of electrons in the shell is called chemistry.

The correct answer is option A  that is Losing an electron would cause the number of protons and electrons to be imbalanced, and the atom would then have an overall negative charge.

According to the question, it is Because the Bohr model explains the Contemplation of the Atom which concedes to the answer explaining the neutrons and electrons have a relation which makes A right.

Hence, the correct option A.

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Hubless cast-iron piping shall be supported every other joint, unless over six feet in length, then it shall be provided with support at every joint.

According to the 2021 edition of the International Plumbing Code (IPC), Hubless cast-iron piping shall be supported every other joint unless the length exceeds 10 feet. In that case, it shall be provided with support at every joint. It's important to note that plumbing codes and regulations can vary by jurisdiction, so it's always best to consult the specific plumbing code applicable to your location for accurate and up-to-date information.

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Answer:

Inferred that fossils were once part of living animals.

Explanation:

He realized that seashells that were from rocks were identical to ones on a beach.

Hope this helps. Plz mark as brainliest!

Have a great day and plz follow me! :)

Answer:

a ground state electron jumps to a higher energy level

Answer:

oxygen ion O2-

Explanation:

because it has 8 protons and gave gained 2 electron so O2-.

To balance the chemical equation: CH3(CH2)7CH3(l) + O2(g) → CO2(g) + H2O(g), we need to ensure that the number of atoms of each element is equal on both sides of the equation.

Let's break down the compounds and balance the equation step by step:

1. Balance the carbon atoms:

On the left side, we have 10 carbon atoms in the heptane (CH3(CH2)7CH3). To balance this, we need 10 carbon atoms on the right side. Therefore, we put a coefficient of 10 in front of CO2.

CH3(CH2)7CH3(l) + O2(g) → 10 CO2(g) + H2O(g)

2. Balance the hydrogen atoms:

On the left side, we have 18 hydrogen atoms in the heptane. To balance this, we need 18 hydrogen atoms on the right side. Therefore, we put a coefficient of 9 in front of H2O.

CH3(CH2)7CH3(l) + O2(g) → 10 CO2(g) + 9 H2O(g)

3. Balance the oxygen atoms:

On the left side, we have 2 oxygen atoms in the heptane and the O2 gas contributes 2 oxygen atoms as well, resulting in a total of 4 oxygen atoms. On the right side, we have 20 oxygen atoms in the 10 CO2 molecules and 9 oxygen atoms in the 9 H2O molecules, totaling 29 oxygen atoms. To balance this, we need 29/2 = 14.5 oxygen molecules. Since we cannot have a fractional coefficient, we can multiply the entire equation by 2 to eliminate the fraction.

2 [CH3(CH2)7CH3(l) + O2(g) → 10 CO2(g) + 9 H2O(g)]

This gives us the balanced equation:

2 CH3(CH2)7CH3(l) + 21 O2(g) → 20 CO2(g) + 18 H2O(g)

Therefore, the balanced equation using the smallest possible whole number stoichiometric coefficients for the combustion of heptane is:

2 CH3(CH2)7CH3(l) + 21 O2(g) → 20 CO2(g) + 18 H2O(g)

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Answer:

large, released

Explanation:

As we know, fireworks contain l o t s of energy, even before the burst of colors release. So i think choice 3 is the answer.

i hope this helps :)

Answer:

40

Correct option is A)

3dm

3

×

24 dm

3

1 mole

​

=0.125 moles of O

2

​

2H

2

​

O

2

​

⟶2H

2

​

O+O

2

​

2 moles of H

2

​

O

2

​

 produces 1 mole of O

2

​

.

0.125 moles of O

2

​

 requires 2×0.125 H

2

​

O

2

​

=0.25 moles of H

2

​

O

2

​

Concentration of H

2

​

O

2

​

=

0.1

0.25

​

=2.5 M

Hence, option A is correct.

Explanation:

Execute Order 66________________

The mass of LiOH needed to make a 300 mL of a solution with a pH of 11.33 is 0.015 g

We'll begin by calculating the pOH of the solution.

pH = 11.33

pOH =?

pH + pOH = 14

11.33 + pOH = 14

Collect like terms

pOH = 14 – 11.33

pOH = 2.67

pOH = –Log [OH⁻]

2.67 = –Log [OH⁻]

–2.67 = Log [OH⁻]

Take the as antilog of –2.67

[OH⁻] = antilog (–2.67)

LiOH(aq) —> Li⁺(aq) + OH⁻(aq)

From the balanced equation above,

1 mole of LiOH contains 1 mole of OH⁻

Therefore,

0.0021 M LiOH will also contain 0.0021 M OH⁻.

Molarity of LiOH = 0.0021 M

Volume = 300 mL = 300 / 1000 = 0.3 L

Mole = Molarity × volume

Mole of LiOH = 0.0021 × 0.3

Mole of LiOH = 0.00063 mole

Molar mass of LiOH = 7 + 16 + 1 = 24 g/mol

Mass = mole × molar mass

Mass of LiOH = 0.00063 × 24

Therefore, the mass of LiOH needed to prepare the solution is 0.015 g

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To find the molar mass of the unknown gas, we can use the ideal gas law, which relates the pressure, volume, temperature, and number of moles of a gas. The ideal gas law is given by:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the universal gas constant, and T is the temperature in kelvins.

We can rearrange this equation to solve for the number of moles:

n = PV / RT

We can then use the number of moles and the mass of the gas to find the molar mass:

M = m / n

where M is the molar mass, m is the mass of the gas, and n is the number of moles.

Plugging in the given values, we have:

P = 1.00 atm

V = 20.0 L

T = 273 K

m = 205 g

R = 0.0821 L·atm/(mol·K)

First, we need to calculate the number of moles of the gas:

n = PV / RT

n = (1.00 atm) x (20.0 L) / (0.0821 L·atm/(mol·K) x 273 K)

n = 0.911 mol

Next, we can use the number of moles and the mass of the gas to calculate the molar mass:

M = m / n

M = 205 g / 0.911 mol

M = 224.8 g/mol

Therefore, the molar mass of the unknown gas is approximately 224.8 g/mol.

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Scatterplot: To visualize the relationship between these two variables, create a scatterplot of the number of beers versus blood alcohol content (BAC).

The next step would be to find the equation of the least-squares regression line, which would give the best prediction of BAC based on the number of beers. A regression analysis software or a statistical formula can be used to calculate the equation.

R-squared is the coefficient of determination, and it measures the strength of the linear relationship between two variables. A strong linear relationship is indicated by a high R-squared value, whereas a weak relationship is indicated by a low R-squared value.

The data analysis demonstrates the relationship between the number of beers and the BAC, as well as the accuracy of the prediction made using the least-squares regression line. The R-squared value provides information on the strength of this relationship, which helps determine the usefulness of using the number of beers to predict BAC.

It's important to note that this analysis should be interpreted with caution, as factors such as body weight, gender, and other individual characteristics can also affect BAC levels.

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there are 8 moles of carbon in the molecule because the ratio of carbon per the whole caffine molecule is 8 carbon atoms: 1 molecule of caffine so in terms of moles that's 8:1 :)

Answer:

Solve a problem with the first 100th on my phone and the phone is a bit annoying and I have to use it to get the battery back.

The right answer is b. Negative ion.

The number of protons in an atom determines its atomic number and its identity as an element. In this case, the oxygen atom has 8 protons, indicating that it is an oxygen atom with atomic number 8.

The number of electrons in a neutral atom is equal to the number of protons, meaning that a neutral oxygen atom would have 8 electrons. However, the given oxygen atom has only 7 electrons, indicating that it has gained one electron to become a negative ion or an anion.

Therefore, the correct answer is b. Negative ion.

In summary, the given oxygen atom with 8 protons, 8 neutrons, and 7 electrons is classified as a negative ion or an anion since it has gained one electron to become negatively charged.

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