use standard reduction potentials to calculate the equilibrium constant for the reaction: sn2 (aq) ni(s) sn(s) ni2 (aq) hint: carry at least 5 significant figures during intermediate calculations to avoid round off error when taking the antilogarithm. equilibrium constant: go for this reaction would be greater less than zero.

The Ka value for the parent acid of Ha is \(Ka = 6.576 \times 10^{-6}\).

Overall equation for this reaction can be given as :

Na+ (aq) + A-(aq) + H2O(l) → Ņa+(aq) + HA(aq) + OH-(aq)

Net ionic equation will be :

\(A^{-}(aq) + H_{2}O(l) \rightarrow HA(aq) + OH^{-}(aq)\\\\K_{b} = \frac{[HA][OH^{-}]}{[A^{-}]}\)

Given, pH = 9.29

The pH of the solution is the negative logarithm of hydrogen ion concentration in aqueous solution.

So, pOH = 14 - 9.29 = 4.71

So, \([OH^-] = 10-4.71 = 1.95 \times 10^-{5}\)

M = [HA]

\(K_{b} = \frac{[HA][OH^{-}]}{[A^{-}]}or, K_{b} = \frac{[1.95 \times 10^{-5}]^{2}}{[0.25]}or, K_{b} = 1.521 \times 10^{-9}\)

Now, we know that;

\(K_{a} \times K_{b} = 10^{-14}or, K_{a} = \frac{10^{-14}}{1.521 \times 10^{-9}}or,\mathbf{ K_{a} = 6.576 \times 10^{-6}}\)

Therefore, the value of \(Ka = 6.576 \times 10^{-6}\).

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Answer:

The answer is A, Carbonated water.

Answer:

if a number of force acting on a body is unable to change it's position then it is called balanced force

guess there's a box

A backdraft explosion can occur when there is a lack of oxygen in a partially-burned room. This situation can be exacerbated if a door is opened into the room, introducing a sudden supply of oxygen, which then leads to a rapid combustion of the remaining fuel, causing the explosion. A fire being very smoky may also indicate a lack of oxygen, increasing the risk of a backdraft explosion.

A backdraft explosion can occur under certain conditions such as when there is a lack of fuel in a partially-burned room or a lack of oxygen in a partially-burned room. Additionally, if a door is opened into a room instead of opening into a hallway or outside, it can create a draft that can lead to a backdraft explosion. Furthermore, a fire that is very smoky can also lead to a backdraft explosion as the smoke can build up and ignite when oxygen is suddenly introduced. It is important to be aware of these potential dangers and to take necessary precautions to prevent a backdraft explosion from occurring.

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Answer:

B . CO2(g) -----> CO2(l) Entropy canbe decreased only in the cases when liquid is converted to solid and when gas is converted to solid or liquid. The option B is correct.

Answer:

b. CO_2 (g) --> CO_2 (l)

Explanation:

A P E X

Answer:

o sou imleyna leqro mueuto ajdairv  c aegra vamos loámas...i o

Explanationaer pgunta t:á incoplmeta

Points that do not lie on the same line are non-collinear or noncollinear.

The great ocean conveyor belt is a model that describes how ocean currents circulate thermal energy around the Earth.

Thermal energy is a type of energy that is associated with an object's or system's temperature. It is the energy that is transferred between two systems or objects as a result of a temperature difference. Thermal energy can be transferred through three methods: conduction, convection, and radiation.

Conduction is the transfer of thermal energy through a material without the material itself moving. Convection is the movement of fluids such as air or water that transfers thermal energy. The transfer of thermal energy via electromagnetic waves, such as light or infrared radiation, is known as radiation.

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The main reservoirs of the carbon cycle are the atmosphere, oceans, land (including vegetation and soils), and fossil fuels. In these reservoirs, carbon exists in both inorganic and organic forms.

The inorganic carbon cycle involves the exchange of carbon dioxide (CO2) between the atmosphere and oceans through processes like photosynthesis and respiration.

Organic carbon, on the other hand, is found in living organisms, dead organic matter, and soil organic matter. It is cycled through processes such as decomposition and consumption by organisms. The interactions between the inorganic and organic carbon cycles occur primarily in the biosphere, where photosynthesis converts inorganic carbon into organic carbon compounds. While inorganic carbon is primarily in the form of CO2, organic carbon is present in complex organic molecules. Both forms of carbon play crucial roles in energy transfer, nutrient cycling, and climate regulation.

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The two effects that  influence the substituent will have on the electrophilic aromatic substitution is the inductive effect and the resonance.

The inductive effect is the electron donating or the electron-withdrawing ability of the substituent, that can influence the reactivity and the stability of that aromatic ring.  The Inductive effects is the attraction of the electrons to the that more electronegative atom of substituent, that will decreases the electron density  on molecule and will decreases the stability of the molecule.

The resonance effect is  the ability of the substituent to delocalize the electrons through the aromatic ring, that will also affect the reactivity and the stability of the ring. The Both of these effects will be considered to be determine the overall influence of the substituent on electrophilic aromatic substitution.

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a) Enthalpy change in specify chemical reaction is 126 kJ/mol.

b) The specify chemical reaction is endothermic reaction.

c) This is not a spontaneous reaction.

We have, a reaction as present below,

\( CH_3CH_3 + I^{.} -> CH_3CH_2^{.} + HI \\ \)

In this reaction, the reactant

\(CH_3CH_2-H\) bond is broken and H-I bond formed. So,

a) The standard enthalpy of reaction for a chemical reaction is defined as the difference between molar enthalpies of total reactant and total product and it is calculated for substances when they present in standard states.

Change in enthalpy = -297 + 423

= 126 kJ/mol.

b) It is endothermic reaction as change in en thakly is positive.

c) No,the reaction will not be spontaneous in the direction written.as, the enthalpy change is positive.

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Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

\(volume = \frac{mass}{density} \\ \)

From the question we have

\(volume = \frac{12.5}{2.5} \\ \)

We have the final answer as

Hope this helps you

Opinion and  and factless ideas  are not science and engineering practice as these are based on observations.

Observations are defined as a set of statements or facts which are recorded while conducting an experiment.Observations are made through sensing changes in the variables of the experiment.

It is specifically defined as an act of knowing or recording the changes in the variables of the experiment.Recording observations holds importance as recording observations avoid the experiment to be repeated over and over again.

It is important to note down observations so that the testing of hypothesis is made easier.There are four types of observations .Observations need to be descriptive and must be written in complete sentences and should include all the numerical data of the experiment.

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Answer:

the correct answer is argon: 1s 2^2s 2^2p 6^3s 2^3p^6​

Explanation:

Answer:

oxygen, carbondioxide

carbondioxide, oxygen

Answer:

The pressure exerted by 66.0 g of CO₂ gas at -14.5°C that occupies a volume of 50.0 L is 0.636 atm.

How do we calculate pressure?

Pressure of any gas will be calculated by using the ideal gas equation as:

PV = nRT, where

P = pressure of gas = ?

V = volume of gas = 50L

R = universal gas constant = 0.082 L.atm/K.mol

T = temperature of gas = -14.5°C = 258.65 K

n is moles of gas and it will be calculated as:

n = W/M, where

W = given mass of CO₂ = 66g

M = molar mass of CO₂ = 44 g/mol

n = 66/44 = 1.5 moles

On putting values we get

P = (1.5)(0.082)(258.65) / (50)

P = 0.636 atm

Hence required pressure is 0.636 atm.

Explanation:

Hope This Helps

Have A Great Day

~Zero~

Explanation:

A mixture is an impure substances with the following properties:

Examples are air, sea - water, muddy water, palm -wine, petroleum, alloys etc.

Using this description it should be easy to identify a mixture.  

The ketone that can be shown by the description have been shown in the image attached.

A strong analytical method known as mass spectrometry can reveal important details about the make-up, structure, and characteristics of molecules. It enables researchers to pinpoint and examine a sample's chemical and isotopic features.

The mass of a molecule or an ion can be precisely determined using mass spectrometry. The mass-to-charge ratio (m/z) measurement enables the recognition and verification of a compound's molecular formula. Particularly relevant to the study of pharmaceutical analysis, biochemistry, and organic chemistry.

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thank you sa points

Explanation:

need ko lungs sorry

To determine the molar mass of an unknown acid, follow these steps:

1. Obtain the formula of the unknown acid.

2. Calculate the mass of a sample of the acid.

3. Determine the number of moles of the sample of the acid.

4. Determine the number of grams per mole of the acid.

The molar mass of the unknown acid can be calculated by dividing the mass of the sample of the acid by the number of moles of the sample of the acid. Molar mass is defined as the mass of one mole of a chemical substance. It is usually expressed in grams per mole. It is calculated by adding up the atomic weights of each of the atoms in the chemical formula of the substance. For instance, let's suppose you want to calculate the molar mass of an unknown acid, HA. The first step is to obtain the chemical formula of the acid, which is HA.

Then, using a balance, obtain the mass of a sample of the acid, for instance, 0.5 g. To determine the number of moles of the sample of the acid, you'll need to divide the mass of the sample by the molar mass of the acid.To determine the number of grams per mole of the acid, add up the atomic weights of each of the atoms in the chemical formula of the substance.

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Answer:

convection

Explanation:

Answer: Convection is correct because of the currents that are placed when the heat comes up and the cooler liquid is going to the bottom!!!

Answer:

Explanations:

The formula for calculating the pH of the solution is given as:

Given that the pH is 2, then;

Hence the concentration of the hydronium ion is 0.01M

Since the pH of the solution is less than 7, hence the solution is acidic

Answer:

the advices are,

1. i would say him or her to give all information about not to do domestic violence who has doing it.

2. i would say him/ herto be strict towards the domestic violence.

3. i would suggest him or her to raise voice aganist towards the domestic violence.

5. i would suggest him or her to negotiate to them for theirbasic rights.

6. if its not possible then i would suggest him or her to complain to the police.

hope u like it ...

Answer:  If my friend has been suffering from domestic violence, then I will advice her to be strict towards domestic violence, believe in yourself, don't lose hope, provide the information about not doing domestic violence for who has doing it, I will suggest her to raise voice against it, to fight for the basic rights, If not possible then i would advice her to complain to police and if it is even worst then I will advice her to leave as soon as possible, make your own decision, etc These advice i would give if my friend has been suffering from domestic violence.

Explanation:

Hope it will help you...................

Answer:

Choice D. Approximately \(61.2\) minutes.

Explanation:

The reaction rate of a second-order reaction is proportional to the square of one of its reactants.

Let \(k\) denote the rate constant of this reaction. Assume that \(y_0\) is the concentration of that reactant at the beginning of this reaction (when \(t = 0\).) Because this reaction is of second order, it can be shown that:

\(\displaystyle y = \frac{1}{k\, t + (1/y_0)}\).

The question states that the rate constant here is \(0.06\; \rm M\cdot min^{-1}\). Hence, \(k = 0.06\). For simplicity, assume that \(t = 0\) when the concentration is \(0.13\; \rm M\). Therefore, \(y_0 = 0.13\). The equation for concentration \(y\) at time \(t\) would become:

\(\displaystyle y = \frac{1}{\underbrace{0.06}_{k}\, t + (1/\underbrace{0.13}_{y_0})}\).

The goal is to find the time at which the concentration is \(0.088\). That's the same as solving this equation for \(t\), given that \(y = 0.088\):

\(\displaystyle \frac{1}{0.06\; t + (1/0.13)} = 0.088\).

\(t \approx 61.2\).

In other words, it would take approximately \(61.2\) minutes before the concentration of this second-order reactant becomes \(0.088\; \rm M\).

Answer:

the ice starts melting and turns into water

The fuel value of propane is 50.3 kj/g. 3.24KJ is the heat that results from the combustion of 2.84 g of propane.

With the increase in a body’s temperature, molecules or atoms’ vibrations increase. These vibrations are subsequently transferred from one part of the body to another. The measure of energy with which the particles vibrate in a system is termed as heat contained in that object. As per the concept of heat, it is defined as the movement of energy from a warm to a cooler object.

mole = 2.84/ 44= 0.064

heat = 50.3×0.064=3.24KJ

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Answer:

atoms relative motion slow down and begin to vibrate in place

0.25 moles of O2 is needed to produce 14.2 grams of P4O10 from P.

In order to calculate the number of moles of O2 needed to produce 14.2 grams of P4O10 from P, we need to use the equation for the reaction:

P + 5O2 → P4O10

We can calculate the number of moles of O2 needed by using the molar mass of P4O10, which is 284 g/mol. First, we need to calculate the number of moles of P4O10 present in 14.2 grams:

14.2 g/ 284 g/mol

= 0.05 mol.

Now, we can use the mole ratio between P and O2 to calculate the number of moles of O2 needed. The mole ratio is 5:1, meaning that for every 5 moles of O2, 1 mole of P is needed. Therefore, to get 0.05 moles of P4O10 from P, we need 0.05 x 5 = 0.25 moles of O2.

In conclusion, 0.25 moles of O2 is needed to produce 14.2 grams of P4O10 from P.

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