Balance each of the following examples of heterogeneous equilibria and write each reaction quotient, Qc:(b) SnO₂(s) + H₂(g) ⇄ Sn(s) + H₂O(g)

The refrigerant in the evaporator absorbs heat from the air passing over it and changes from a liquid to a vapor. The correct answer is option B.

This vapor is then compressed and cooled, and the resulting condensed liquid is returned to the evaporator.

Condensation is referred as the process where in water vapor becomes liquid. It is totally reverse of evaporation, where liquid water becomes a vapor. Condensation  usually happens one of two ways: Either the air is cooled to its dew point or it usually becomes so saturated with water vapor that it cannot hold any more water content.

Refrigerants are known as the chemicals used for the cooling effects. They are usually used for expansion and vaporizing. It is a type of fluid used in the refrigeration process and makes the substances undergo phase transitions.

The correct answer is option B.

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The equation shows reactants to a neutralization reaction.

Ca²⁺ + OH⁻ → H⁺ + NO⁻. Here H binds with OH⁻ to make water. So the option c is correct.

As the answer to the question is cleared from these reactions. Firstly calcium hydroxide combines with nitric acid to form the products as follows;

Ca(OH)₂ + 2HNO₃ → Ca(NO₃)₂ + 2H₂O

Now the reaction between ionic species will be as follows

Ca²⁺ + 2OH⁻ + 2H⁺ + 2NO₃⁻ → Ca²⁺ + 2NO₃⁻ + 2H₂O

Hence OH⁻ combines with  H⁺  to make  H₂O(water)  

OH⁻ + H⁺ → H₂O

H⁺ binds with OH⁻ to make water

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Given Figure 2 below shows a set of contour lines for temperature, and the question wants you to complete a simple analysis of temperature. The analysis should be made for the 75 and 70°F isotherms. The 80°F contour is also to be analyzed.

Figure 2 From the image above, we can identify the following contour lines and their values:Contour line C1 is for a temperature of 60°F.Contour line C2 is for a temperature of 65°F.Contour line C3 is for a temperature of 70°F.Contour line C4 is for a temperature of 75°F.Contour line C5 is for a temperature of 80°F.Using the given information, we can then proceed to answer the questions as follows:Analysis for the 75°F isotherm Contour line C4 shows a temperature of 75°F. This means that any point lying on this contour line has a temperature value of 75°F. Therefore, we can conclude that the following regions have a temperature of 75°F:Region A: This region is enclosed by contour lines C3 and C4.

Thus, it has a temperature of 75°F.Region B: This region is enclosed by contour lines C4 and C5. Thus, it has a temperature of 75°F.Analysis for the 70°F isotherm Contour line C3 shows a temperature of 70°F. This means that any point lying on this contour line has a temperature value of 70°F. Therefore, we can conclude that the following regions have a temperature of 70°F:Region C: This region is enclosed by contour lines C2 and C3. Thus, it has a temperature of 70°F.Region D: This region is enclosed by contour lines C3 and C4. Thus, it has a temperature of 70°F.Analysis for the 80°F contourContour line C5 shows a temperature of 80°F. This means that any point lying on this contour line has a temperature value of 80°F. Therefore, we can conclude that the following regions have a temperature of 80°F:Region E: This region is enclosed by contour lines C4 and C5. Thus, it has a temperature of 80°F.

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Answer:

B! SPIRAL CAUSE ITS SPINNY AND PRETTY UWUUUUUU hehe :3

The pH of the acetic acid solution is 7.46.

A standard hydrogen electrode (SHE) is immersed in an acetic acid (CH3COOH) solution, and connected by an external circuit to an iron nail dipping into 0.10 M FeCl2. The measured potential of this cell, Ecell, is 0.24 V. To calculate the pH of the acetic acid solution, we must first understand the reaction taking place in the cell.

The SHE acts as the reducing agent in the cell, and is oxidized according to the following reaction:

SHE + H+ → H2

At the same time, the iron nail is acting as the oxidizing agent, and is reduced according to the following reaction:

Fe2+ + 2e- → Fe

Combining the two reactions, we can construct the overall cell reaction:

CH3COOH + H+ + Fe2+ → CH3COO- + H2 + Fe

Using the Nernst equation, we can calculate the pH of the acetic acid solution:

Ecell = E0cell - (RT/F) * ln( [CH3COO-] * [Fe] / [CH3COOH] * [Fe2+] )

Rearranging the equation:

pH = pK + log[ (Ecell - E0cell) / (RT/F) ] + log([CH3COOH]/[Fe2+])

Using the given values, we can calculate the pH of the acetic acid solution:

pH = 4.76 + log[ (0.24 - 0) / (0.0591) ] + log([1]/[0.10])

= 4.76 + 1.7 + 1

= 7.46

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Answer:

4 Fe + 6 02 ----> 2 Fe2O3

Explanation:

you need 4 iron and 6 oxygen in each side

Answer:

See explanation

Explanation:

A dipole refers to a bond in which its two ends have opposite charges. A dipole results from a large difference in electronegativity between two atoms in a bond.

For instance, consider the bond between hydrogen and chlorine in HCl. The electronegativity of hydrogen is 2.2 while that of chlorine is 3.16. The significant electronegativity difference between the two atoms leads to a charge separation.

A partial positive charge appears on the atom that is less electronegative (hydrogen) while a negative charge appears on the more electronegative atom (chlorine).

This charge separation occurs because the shared electrons of the bond are more closely attracted to chlorine making it partially negative compared to hydrogen. A dipole moment now exists in the H-Cl bond hence the molecule is said to have a dipole.

The mass of ammonia that can be produced from the reaction of 74.2 g of N₂ and 14.0 moles of H₂ is 90.1 g.

The mole ratio of the reaction for the production of ammonia is obtained from the balanced equation of the reaction as follows:

Equation of the reaction: N₂ (g) + 3 H₂ (g) → 2 NH₃ (g)

The mole ratio of the reactants nitrogen and hydrogen is 1 : 3

Moles of nitrogen in 74.2 g of nitrogen = 74.2/28

Moles of nitrogen in 74.2 g of nitrogen = 2.65 moles

Moles of hydrogen present = 14.0 moles

The limiting reactant is nitrogen

Mole ratio of nitrogen to ammonia is 1 : 2

Mass of ammonia produced = 2.65 * 2 * 17 g

Mass of ammonia produced =  90.1 g

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Answer:

4.70 grams of NH4Cl is needed to prepare 350 mL of a 0.25 M ammonium chloride solution.

We need approximately 4.68 grams of NH4Cl to prepare a 0.25 M ammonium chloride solution with a volume of 350 mL.

To determine the mass of NH4Cl needed to prepare the solution, we us use the formula:

m=M x V x MM ... (i)

where,

m= mass in grams

M=molarity of solution

MM= molar mass of compound

V= volume in litres

The number of moles of NH4Cl needed can be calculated using:

  Moles = Molarity x Volume ...(ii)

  Moles = 0.25 mol/L x 0.350 L

  Moles = 0.0875 mol

Hence we can replace M x V with number of moles in equation i.

The molar mass of NH4Cl is :

  Molar mass of NH4Cl = (1 x 14.01 g/mol) + (4 x 1.01 g/mol) + (1 x 35.45 g/mol)

  Molar mass of NH4Cl = 53.49 g/mol

We have all the variables

Putting them in equation i.

Hence,

  Mass (g) = Moles x Molar mass

  Mass (g) = 0.0875 mol x 53.49 g/mol

  Mass (g) = 4.68 g

Therefore, you would need approximately 4.68 grams of NH4Cl to prepare a 0.25 M ammonium chloride solution with a volume of 350 mL.

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Explanation:

one substance

+one substance=balanced of chemical equation

The first step to answer this question is to assume that the given percents are masses.

Then, convert these masses to moles using the corresponding molar mass:

Divide each result by the least result (1.26mol):

Since not all of these are whole numbers, we have to multiply them times 2:

These numbers are the subscripts of each element in the empirical formula.

It means that the empirical formula of this compound is:

The property of benzene that is a result of delocalisation of electrons in the benzene ring is the stability of the benzene ring.

Benzene is a colorless, highly flammable liquid with a pleasant odor. It's an important starting material for a variety of chemical products, including plastics, resins, synthetic fibers, rubber additives, and dyes. Its molecular formula is C6H6, and its structure is a hexagonal ring of carbon atoms, with a hydrogen atom bonded to each carbon atom. Each carbon atom also has a delocalized pi electron that interacts with the pi electrons of the other carbon atoms in the ring.

Delocalization is a general term for describing the movement of electrons away from a single atom or a pair of atoms. When the pi electrons in a benzene ring are delocalized, they move freely around the ring, creating a cloud of electron density above and below the ring. Because the electrons are free to move around, they don't belong to any single carbon atom in the ring but instead belong to the entire ring. As a result of the delocalization of electrons in the benzene ring, it has a high degree of stability, making it a common feature in organic compounds.

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Answer:

Explanation:

A compound that can act both as an acid and a base is called an amphoteric substance. A good example (based on the question) of an amphoteric substance is the Aluminium hydroxide [Al(OH)₃] where Aluminium is the "M" in M-O-H. Aluminium is in the third period of the periodic table. The reaction below shows aluminium can act both as an acid and as a base in different neutralization reactions.

As an acid

Al(OH)₃ + 3NaOH ⇒ Na₃AlO₃ + 3H₂O

As a base

3HCl + Al(OH)₃ ⇒ AlCl₃ + 3H₂O

NOTE: A neutralization reaction is a reaction between an acid and a base to give you salt and water

(a) The probabilities of occupying each state at T=100K, 500K, and 10000K are to be calculated for a set of nondegenerate levels with energies of e/k = 0, 100, 200 and 4500 K.

(b) As the temperature continues to increase, the probabilities will approach a limiting value.

(a) The probability of occupying each state is given by the Boltzmann distribution, which states that the probability is proportional to the exponential of the energy of the state divided by the thermal energy kT. Thus, the probability of occupying the states with energies e/k = 0, 100, 200, and 4500 K at temperatures T = 100, 500, and 10000 K can be calculated as follows:

P(e/k=0) = exp(-0/kT)

P(e/k=100) = exp(-100/kT)

P(e/k=200) = exp(-200/kT)

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A buffer is made from an acid - base conjugate pair as shown by option A

Buffers are often composed of weak acids and their conjugate bases (or weak bases and their conjugate acids). The weak acid can contribute a proton to balance any new base, whereas the conjugate base can absorb a proton to do so.

This balance between the acid and its conjugate base allows the buffer to survive pH changes. Buffers are essential in biological systems because many biochemical processes are particularly sensitive to pH changes.

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Answer:

b

Explanation:

by using formula

a=(v-u)/t

where a= acceleration

v = initial velocity = 10 m/s

u= final velocity =50 m/s

t = time taken = 2s

The acceleration of the rocket has been given by 20 m/\(\rm sec^2\). Thus option B is correct.

Acceleration has been the increase in the speed of the object with respect to the time. The acceleration can be given by:

a = \(\rm \dfrac{v\;-\;u}{t}\)

Where,

a = acceleration

v = final velocity = 50 m/s

u = initial velocity = 10 m/s

t = time = 2 s

Substituting the values:

Acceleration = \(\rm \dfrac{50\;-\;10}{2}\)

Acceleration = 20 m/\(\rm sec^2\)

The acceleration of the rocket has been given by 20 m/\(\rm sec^2\). Thus option B is correct.

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Explanation:

The Gas Law Apparatus is a high-quality demonstrator of the relationship between pressure, volume and temperature of a gas. The pressure gauge shows how pressure affects volume and vice versa. A digital thermometer displays the temperature.

Answer:

0.78× 10 ²³ molecules

Explanation:

Given data:

Mass of pyridine = 10.35 g

Number of molecules = ?

Solution:

Number of moles of pyridine:

Number of moles = mass/molar mass

Number of moles = 10.35 g/ 79.1 g/mol

Number of moles = 0.13 mol

Number of molecules;

1 mole contain 6.022× 10 ²³ molecules

0.13 mol × 6.022× 10 ²³ molecules / 1mol

0.78× 10 ²³ molecules

Answer:

ΔG° = 80 Kj/mole

Explanation:

ΔG° = -R·T·ln(Kw)

R = 0.008314 Kj/mol·K

T = 25°C = 298K

Kw = 1 x 10⁻¹⁴

ΔG° = -R·T·ln(Kw) -(0.08314Kj/mol·K)(298K)ln(1 x 10⁻¹⁴)

= -(0.008314)(298)(-32.2)Kj/mole

= 79.78Kj/mole ≈ 80Kj/mole (1 sig.-fig.)

The change in free energy for the autoionization of water at 25°C is -79.9 KJ

Using the formula;

ΔG = -RTlnK

ΔG  = change in free energy = ?

R = gas constant = 8.314 J/K/mol

T = temperature = 298 K

K = equilibrium constant = 1.0 X 10^-14

Substituting into the given formula as;

ΔG = -  (8.314 J/K/mol × 298 K × ln(1.0 X 10^-14))

ΔG = -7.99 × 10^4 J/mol or -79.9 KJ/mol

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MgS has a higher melting point than Lil. Hence, option A is correct.

Ionic compounds contain ions and are held together by the attractive forces among the oppositely charged ions.

MgS is made up of ions with greater charges, it has the higher lattice energy and is the stronger bond.

Lithium iodide is a covalent compound. Therefore, due to the large size of the iodine ion its valence electrons will be loosely held by the nucleus. So, lithium-ion will easily polarize the iodine electrons which results in sharing of electrons.

MgS has a higher melting point than Lil.

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In Niels Bohr’s model of the atom, electrons are configured in a series of concentric shells around the nucleus. The shells are numbered, with the shell closest to the nucleus being numbered one, and each succeeding shell numbered two, three, and so on.

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Answer:

A. Boiling

Explanation:

Based on the mass ratio, the mass of H₂ produced is 3.51 g of H₂

The mass ratio of a reaction is the ratio of the masses of the reactants as well as as products in a balanced equation of a reaction.

The equation of the reaction is given below;

2 AI + 6 HCI → 2 AICI₃ + 3 H₂

From the reaction equation, 2 * 27 g of Al produces 3 * 2 g of H₂

32.25 g of Al will produce: 6/55 * 32.25 g of H₂

Therefore, mass of H₂ produced is 3.51 g of H₂

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Answer:

From the reaction equation, 2 * 27 g of Al produces 3 * 2 g of H₂

32.25 g of Al will produce: 6/55 * 32.25 g of H₂

Therefore, mass of H₂ produced is 3.51 g of H₂

Explanation:

.ANSWER

STEP-BY-STEP EXPLANATION

From the question given, you were asked to name a compound

Cobalt (II) Bromide Heptahydrate

The heptahydrate in the compound means it has 7 molecules of water

Therefore, the chemical formula can be written below as

A black t-shirt absorbs the most visible light. This is because black is a color that absorbs all visible light, which is why it appears to be a dark color.

Correct option is A.

When light hits a black t-shirt, the material absorbs the photons, which is why it looks dark and doesn't reflect light like a white t-shirt or a white rock would. When visible light enters a black t-shirt, it is absorbed by the molecules in the material, and is converted into heat. This is why a black t-shirt can feel warmer than other colored t-shirts.

A clear bowl, a white rock and a red apple all reflect visible light, so they don't absorb as much as a black t-shirt. All these objects are able to absorb some visible light, but a black t-shirt absorbs the most. A black t-shirt absorbs more visible light than any other object because it is a darker color, and darker colors absorb more light.

Correct option is A.

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For the given equation, the mole-to-mole ratio and volume-to-volume ratio for all the gaseous reactants and products are 1:1.

For the given equation:

CH4(g) + O2(g) → CO2(g) + H2O(g)

Reactant/Product:

CH4(g)

O2(g)

CO2(g)

H2O(g)

Mole-to-Mole Ratio:

By comparing the reactant and product coefficients, we may extract the mole-to-mole ratio from the balanced equation.

CH4(g): 1 mole

O2(g): 1 mole

CO2(g): 1 mole

H2O(g): 1 mole

All of the reactants and products have a mole-to-mole ratio of 1:1:1:1.

Ratio of Volume to Volume:

The ideal gas law, which states that under constant temperature and pressure, the volume of a gas is directly proportional to the number of moles in the gas, can be used to calculate the volume-to-volume ratio.

All gaseous reactants and products have a mole-to-mole ratio of 1:1, hence the volume-to-volume ratio will also be 1:1. As a result, the volume of drug A and substance B will be equal.

You can just take the volume of substance A as the value for substance B if you know the volume of substance A and are trying to solve for the volume of substance B. Alternatively, the quantity of substances A and Bwill be the same, given the 1:1 volume-to-volume ratio.

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Answer:

Atoms or molecules

Explanation:

Because if molecules are heated or colded the can be liquid or solid

Answer:

gidgjfxdgjxhfkzyjyfxgjfxj

Explanation:

Each illustration shows a practical application of magnets to a problem.

They support documents on a refrigerator.

They are employed to seal the freezer's door and lid.

From a combination, they can remove magnetic objects.

With a magnet, all of the issues on the list can be resolved. We can use a magnet on the refrigerator to display a photo or holiday card. When the magnets inside the freezer are close to one another and are attracted to one another, the door is sealed shut and keeps our food cold. If metallic objects are present in a mixture, the magnet can be used to separate those items based on their magnetic characteristics. These are straightforward issues with a straightforward resolution: magnets!

Students are introduced to the main steps in the engineering design process during the presentation. They then read through a scenario in which middle school student Marisol struggles to keep their locker organized in discussion groups.

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Answer:b

Explanation: