Consider the following reaction: NH4I(s) NH3(g) + HI(g) If a flask maintained at 674 K contains 0.138 moles of NH4I(s) in equilibrium with 4.34×10-2 M NH3(g) and 9.39×10-2 M HI(g), what is the value of the equilbrium constant at 674 K?

Answer: Neils Bohr

Explanation: Development of the Atomic Theory. In 1913, Neils Bohr, a student of Rutherford 's, developed a new model of the atom. He proposed that electrons are arranged in concentric circular orbits around the nucleus. This model is patterned on the solar system and is known as the planetary model.

Answer:

oxygen = 4.7 * 10^-6

Nitrogen = = 9.7 * 10^6

Explanation:

partial pressure of oxygen = 0.20 atm

partial pressure of Nitrogen = 0.80 atm

calculate the mole fractions of oxygen and Nitrogen in water

Temp = 298k

applying henry's law

molar conc of oxygen in water ( Coxygen )

= Kp = 1.3 * 10^-3 Mol/L.atm * 0.20 atm = 2.6 * 10^-4 Mol

molar conc of Nitrogen in water ( Cnitrogen )

= Kp = 6.8 * 10^-4 Mol/L.atm * 0.80 atm = 5.4 * 10^-4

next Given that the number of moles in 1 liter of water = 55.5 mol  

therefore the mole fraction of oxygen

= 2.6 * 10^-4 / 55.5

= 4.7 * 10^-6

mole fraction of Nitrogen

= 5.4 * 10^-4  / 55.5

= 9.7 * 10^6

Answer:

Joints

Explanation:

Without joints we would not be able to bend our arms or legs. Hence option C is correct.

Bending is defined as the behavior of a thin structural element under an external load that is applied perpendicular to the element's longitudinal axis. Plants and their parts are thought to bend as a result of a flexure process in which the curvature of the plant part changes. The plant organs' collenchyma gives them flexibility and elasticity, preventing them from breaking when bent.

The force required to bend, straighten, and support joints is applied by muscles to the bones. Muscles act in pairs of flexors and extensors because they may pull on bones but not put them back into place. The extensor muscle relaxes and stretches as the flexor muscle contracts to bend the joint.

Thus, without joints we would not be able to bend our arms or legs. Hence option C is correct.

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Answer:

option C 5

hope this answer helps you dear! take care

Answer:

5, the coefficient is the number right before the variable. The ² and ³ (even though Mines on top and yours is on the bottom) are not coefficient because. . . well it just doesn't make sense.

Answer:

This is a waning moon.

Explanation:

Answer:

Its waxing moon

Explanation:

When a chocolate bar is solid, it is able to smell it.  It is also important to note that a substance 's molecules cannot be in two distinct phases at the a time.

In general, it is not possible for a the molecules of the chocolate  to be in two distinct phases at the same time.

It must be noted that smelling a solid, such as a chocolate bar, however, mean  the release  of loose molecules from the solid,   which may then move   through the air and   reach our olfactory receptors in our nose, allowing us to sense the fragrance.

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Answer:

A : convection

B : conduction

Explanation:

Answer:

A. Convection

B. Conduction

Explanation:

Answer:

its sodium hydroxide

Explanation:

The theoretical yield of water formed from the reaction of 46.8g of octane and 287g of oxygen gas is 58.58 g.

A balanced chemical equation is a representation of a chemical reaction using chemical formulas and symbols. It shows the reactants and products of the reaction, and the coefficients in front of the formulas ensure that the number of atoms of each element is the same on both sides of the equation.

The balanced chemical equation for the reaction between octane and oxygen gas is:

2 C8H18 + 25 O2 → 16 CO2 + 18 H2O

According to the stoichiometry of the balanced equation, 2 moles of octane react with 25 moles of oxygen gas to produce 18 moles of water. Therefore, the molar ratio of octane to water is 2:18 or 1:9.

First, we need to determine which reactant is limiting, i.e., which reactant will be completely consumed in the reaction. To do this, we can calculate the amount of water that would be produced if each reactant were to react completely and then compare the results.

The molar mass of octane (C8H18) is 114.23 g/mol, so 46.8 g of octane is equal to:

46.8 g / 114.23 g/mol = 0.41 mol

The molar mass of oxygen gas (O2) is 32.00 g/mol, so 287 g of oxygen gas is equal to:

287 g / 32.00 g/mol = 8.97 mol

Now, we can calculate the theoretical yield of water based on the amount of each reactant:

Octane: 0.41 mol octane × 9 mol H2O/1 mol octane = 3.69 mol H2O

Oxygen gas: 8.97 mol oxygen gas × 9 mol H2O/25 mol O2 = 3.25 mol H2O

Since the stoichiometry of the reaction indicates that the amount of water produced should be proportional to the amount of octane used, and the calculation shows that less water would be produced if we used all of the oxygen gas, we conclude that oxygen is the limiting reactant.

Therefore, the theoretical yield of water formed is 3.25 mol H2O × 18.02 g/mol = 58.58 g H2O.

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Answer:

endet nach selam nw

4gh7

Answer:

0.012 mol

Explanation:

Step 1: Given data

Atoms of sulfur: 7.0 × 10²¹ atoms

Step 2: Calculate the moles corresponding to 7.0 × 10²¹ atoms of sulfur

In order to convert atoms to moles, we need a conversion factor. In this case, we will use Avogadro's number: there are 6.02 × 10²³ atoms of sulfur in 1 mole of atoms of sulfur.

7.0 × 10²¹ atoms S × 1 mol S/6.02 × 10²³ atoms S = 0.012 mol S

Taking into account the definition of calorimetry, the mass of iron that must be added is 531.556 grams.

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

When heat added or removed from a substance causes a temperature change in it without affecting its molecular structure, it is called sensible heat.

So, the equation that allows to calculate heat exchanges is:

Q = c× m× ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case, you know:

Replacing in the expression to calculate heat exchanges:

For iron: Qiron= 0.450 J/(g°C) × mass of iron× (65 °C - 100 °C)

For water: Qwater= 4.186 J/(g°C) × 50 g× (65 °C - 25 °C)

If two isolated bodies or systems exchange energy in the form of heat, the quantity received by one of them is equal to the quantity transferred by the other body. That is, the total energy exchanged remains constant, it is conserved.

Then, the heat that the gold gives up will be equal to the heat that the water receives. Therefore:

- Qiron = + Qwater

- 0.450 J/(g°C) × mass of iron× (65 °C - 100 °C)= 4.186 J/(g°C) × 50 g× (65 °C - 25 °C)

Solving:

15.75 J/g × mass of iron= 8372 J

mass of iron= 8372 J÷ 15.75 J/g

mass of iron= 531.556 grams

Finally, the mass of iron necessary is 531.556 grams.

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Answer:

The balanced equation for the reaction of NH3 and O2 is: 4 NH3 + 5 O2 -> 4 NO + 6 H2O.

From the balanced equation, it can be determined that for every 4 moles of NH3, 5 moles of O2 are needed to react.

To convert 14.8 g of NH3 to moles, the following calculation can be used: 14.8 g NH3 / 17.03 g/mol = 0.87 moles NH3.

Therefore, the number of moles of O2 needed to react with 14.8 g of NH3 is: 0.87 moles NH3 * (5 moles O2 / 4 moles NH3) = 1.09 moles O2.

To convert moles of a substance to grams, the following calculation can be used: moles x molar mass (in g/mol)

Therefore, the number of grams of O2 needed to react with 14.8 g of NH3 is: 1.09 moles O2 * (32.00 g/mol) = 35.1 g O2

a) Calculate the density of the block.

The density of any substance is defined as the mass divided the volume.

Density of the block = mass of the block/volume of the block.

We are given the mass of the block.

mass of the block = 5.60 kg

Since the it is an iron cube, we can find its volume.

Side = 20 cm = 0.20 m

Volume of the block = (side)³

Volume of the block = (20 cm)³ = (0.20 m)³

Volume of the block = 8000 cm³ = 0.008 m³

Now that we know the mass and the volume we can find the density of the block.

Density of the block = Mass of the block / Volume of the block

Density of the block = 5.60 kg / 8000 cm³

Density of the block = 0.0007 kg/cm³

Density of the block = 5.60 kg / 0.008 m³

Density of the block = 700 kg/m³

Answer: The density of the block is 0.0007 kg/cm³ or 700 kg/m³

b) Calculate the mass of water displaced:

If we consider that the cube is completely submerged (as the problem says) it will displace some water. How much water does it displace? Archimedes' says: "The volume of displaced fluid is equivalent to the volume of an object fully immersed in a fluid". That means that the block completely submerged in water (fluid) will displace its volume of water.

volume of water displaced = volume of the block

volume of water displaced = 8000 cm³ = 0.008 m³

Now that we know the volume of water displaced, and since we are given the density of water, we can find the mass of water displaced.

Density of water = mass of water / volume of water

mass of water = volume of water * density of water

mass of water = 0.008 m³ * 1000 kg/m³

mass of water displaced = 8.0 kg

Answer: Supposing that the block is completely submerged it displaces 8.0 kg of water.

The other nuclide formed in this reaction U-236.

The other nuclide formed in this reaction is not directly specified, but we can infer it using the principle of conservation of nucleons and charge.

The nucleus of U-235 has 92 protons and 143 neutrons, while the nucleus of Sb-125 has 51 protons and 74 neutrons. When U-235 absorbs a neutron, the resulting nucleus has a mass number of 236 (235 + 1 neutron) and a charge of 92 (since neutrons are uncharged).

To produce Sb-125 as a product, the resulting nucleus must undergo beta decay by emitting an electron (e-) and an antineutrino (), which converts one of its neutrons into a proton:

n + U-235 → U-236* → Sb-125 + 4n + e- +

The resulting nucleus is U-236*, which denotes an excited state of U-236. This state is metastable, meaning it has a longer half-life than other states of the same nucleus. U-236* promptly emits four neutrons to stabilize itself, releasing a total of five neutrons:

n + U-235 → U-236* → Sb-125 + 4n + e- +

            ↓

         4n + U-236 + energy

Therefore, the equation for this reaction is:

n + U-235 → Sb-125 + X + 4n + e- + + energy

where X denotes the other nuclide formed, which is U-236.

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Answer: 15%

Explanation:

We must first calculate the z-score. The z-score is calculated using the following procedures:

Z = (x - ) / Z, where x is the value, we are interested in (3 in this example), and is the distribution's mean, which is taken to be 0 for the conventional normal distribution.

This equation gives us the result: z = (3 - 0) / 1 = 3.

A standard normal table may then be used to calculate the percentage of beverages that require more time to prepare than three minutes. As can be seen in the table, the area to the right of z = 3 is approximately 0.00131. Therefore, 0.13% of drinks will require more time to make than 3 minutes.

The standard score, also known as the observed value or data point, is the departure from or excess over the raw score for an item, reported in standard deviations. Standard scores are good for raw scores that are both higher and lower than the mean.

It may be determined by taking the supplied raw score and removing the population mean from it, then dividing the result by the population standard deviation. The act of converting a raw score into a standard score is known as standardization, but "normalizing" can refer to a variety of other ratio types; see normalization for more information.

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Answer:

Di ko po alam eyan ehh sorry po uWu

Explanation:

Sorry

Transformation in chemistry is scientifically used to explain the process of changing one compound to another in a chemical reaction.

The word "transformation" has a very special significance in chemistry. We know that in English, to transform would simply imply to change from one form to another. This is not quite far from its meaning in the parlance of chemistry.

The word transformation is normally applied in the area of chemical reactions especially as it has to do with reaction with in organic chemistry. It has to do with the change from one molecule to another and this is of great importance in the discussion of synthetic chemistry.

As such, the word transformation in chemistry is scientifically used to explain the process of changing one compound to another in a chemical reaction.

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The combustion of wood results in the generation of new substances such as carbon dioxide gas, water vapor, ash, and so on. Some compounds do not completely burn or do not react at all, resulting in the formation of fire ash.

When we burn wood, it transforms into ashes, a new material, and the process is irreversible, resulting in a chemical shift. No new material is generated while chopping the wood into little pieces. It is a bodily transformation. When two colorless liquids are put together, the creation of a solid precipitate indicates the presence of a chemical reaction. When a colorless solution of lead(II) nitrate is added to a colorless solution of potassium iodide, an immediate yellow solid known as a precipitate is formed. Dense hardwood species, such as maple and oak, contain more energy, burn hotter and slower, and release more heat, resulting in longer-lasting fires and coal beds. Because softwoods are less thick than hardwoods, they burn quicker in short-lived flames.

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The strongest intermolecular force between Xe and NH3 is dipole-induced dipole interaction.

NH3 is a polar substance. The molecule has a dipole moment therefore there exists dipole - dipole interaction within the molecule.

In addition to that, nitrogen is bonded to hydrogen which leads to extensive hydrogen bonding in NH3.

On the other hand, Xe is a noble gas and the strongest interaction between Xe particles are dispersion forces.

However, when Xe is combined with NH3, the two interact via  dipole-induced dipole interactions.

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Answer:

The answer is combustion.

3.0 moles of aluminum ions

An Aluminium oxide Al₂O₃ consists of;

• two ,aluminum cations 2Al³⁺ and;

• three ,oxygen anions 3O²⁻

Based on stoichiometry, one mole of aluminum oxide therefore contains;

• two ,aluminum cations 2Al³⁺ and;

• three ,oxygen anions 3O²⁻

Given the parameter:

Number of moles of aluminum oxide = 1.5 moles

The number of moles of aluminum ion is calculated as thus:

Hence the number of moles of aluminum ions in 1.5 moles of Al₂O₃ is 3.0 moles

Answer:

neon

Explanation:

there are 10 protons

Answer:

The cation affects the intensity of the color more than the color of the solution.

Explanation:

According to Beer Lambert law, the intensity of the colour of the solution depends on the concentration of the specie responsible for the colour in the solution.

Let us recall that transition metal compounds are coloured in solution due to electronic transitions.

Therefore, the cation affects the intensity of the color more than the color of the solution.

Answer:

sound waves

Explanation:

hope this helps

It took Approximately 52 minutes and 40 seconds for an electromagnetic signal to travel to Earth from Pioneer 11 when it was near Jupiter.

The speed of light, which is the speed at which an electromagnetic signal travels in a vacuum, is approximately 299,792,458 meters per second.

To find out how long it takes for an electromagnetic signal to travel from Pioneer 11 to Earth when it was near Jupiter, we can use the formula:

The distance between Pioneer 11 and Earth when it was near Jupiter is approximately 998 million km, or 998,000,000 km.

Converting this distance to meters, we get:

Dividing the distance by the speed of light, we get:

Converting this time to minutes and seconds, we get:

Rounding to the nearest minute and second, we get:

Therefore, it took approximately 52 minutes and 40 seconds for an electromagnetic signal to travel from Pioneer 11 to Earth when it was near Jupiter.

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A)  the addition of \(H_3O\)+ or OH- ions would have opposing effects on the buffer solution.

b) \(H_3O\)+ would favor the formation of acetic acid, while adding OH- would favor the formation of acetate ions.

c) The exact magnitude of the changes in concentrations depends on the initial concentrations of \(CH_3COOH\) and \(CH_3COONa\), as well as the specific amount of \(H_3O\)+ or OH- added.

To determine the effect of adding \(H_3O\)+ and OH- on the given buffer solution, we need to consider the ionization of acetic acid (\(CH_3COOH\)) and the dissociation of its sodium salt (CH3COONa). Let's analyze each scenario separately:

A) Buffer solution consisting of 0.5 M\(CH_3COOH\) and 0.5 M \(CH_3COONa\):

When acetic acid (CH3COOH) and its sodium salt (\(CH_3COONa\)) are present together in a solution, they form a buffer system. Acetic acid partially ionizes in water, releasing \(H_3O\)+ ions, while sodium acetate dissociates into Na+ and \(CH_3COO\)- ions.

Adding \(H_3O\)+:

The \(H_3O\)+ ions would react with the acetate ions (CH3COO-) to form undissociated acetic acid (\(CH_3COOH\)) through the following reaction:

\(H_3O\)+ + \(CH_3COO\)- ⇌ \(CH_3COOH\) + H2O

The addition of H3O+ would shift the equilibrium to the left, promoting the formation of more acetic acid and decreasing the concentration of acetate ions.

Adding OH-:

The OH- ions would react with the acetic acid (\(CH_3COOH\) to form water and acetate ions (CH3COO-) through the following reaction:

OH- + \(CH_3COOH\) ⇌ \(CH_3COO\)- + H2O

The addition of OH- would shift the equilibrium to the right, consuming acetic acid and increasing the concentration of acetate ions.

B) After adding 0.02 mol of NaOH to 1.0 L of the buffer solution:

When solid NaOH is added to the buffer solution, it dissociates completely in water to form Na+ and OH- ions.

NaOH dissociation:

NaOH → Na+ + OH-

The OH- ions formed would react with acetic acid according to the reaction mentioned in Scenario A (2), increasing the concentration of acetate ions and consuming acetic acid.

C) After adding 0.02 mol of HCl to 1.0 L of the buffer solution:

When HCl is added to the buffer solution, it dissociates completely in water to form \(H_3O\)+ and Cl- ions.

HCl dissociation:

HCl → \(H_3O\)+ + Cl-

The \(H_3O\)+ ions formed would react with acetate ions (\(CH_3COO\)-) according to the reaction mentioned in Scenario A (1), forming more undissociated acetic acid and decreasing the concentration of acetate ions.

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The theoretical yield of carbonic acid is 12 %.

What is carbon dioxide ?

One part carbon and two parts oxygen make up the gas called carbon dioxide. Its usage by plants to create carbohydrates during a process known as photosynthesis makes it one of the most significant gases on the planet.

What is reaction ?

The transformation of one or more reactants into one or more new products is referred to as a chemical reaction. Substances are made of chemical constituents or compounds. The transformation of one or more reactants into one or more new products is referred to as a chemical reaction. Substances are made of chemical constituents or compounds.

Therefore, The theoretical yield of carbonic acid is 12 %.

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