ion x has a charge of 2 , and ion y has a charge of 1-. what is the formula unit of the compound formed from the ions?

Answer: 20 C

Explanation:

I would put it in 20 C because it is closer to the 20 C than the 30 C (it is below 25 C).

The normal freezing point of 0.22 m NaCl(aq), assuming it undergoes complete dissociation, is - -0.97 °C.

The freezing point constant of water is 1.86 K · kg/mol.The normal boiling point of a solution is determined by its concentration. The normal boiling point is equal to the boiling point of the pure solvent.

According to Raoult's law, the vapor pressure of a solution is proportional to the mole fraction of the solvent in the solution.The formula to find the change in boiling point of a solution is ΔTb = Kb · m. The formula to find the change in freezing point of a solution is ΔTf = Kf · m.

Here, the solution is NaCl(aq) and the concentration of the solution is 0.22 m. Since NaCl is an ionic compound, it undergoes complete dissociation into its ions in water. Therefore, the number of particles in solution is double the concentration of NaCl.

The concentration of particles in solution is 2 × 0.22 = 0.44 m.Using the formula ΔTf = Kf · m, we can find the change in freezing point of the solution. ΔTf = 1.86 K · kg/mol × 0.44 mol/kg = 0.8184 K.

Since the normal freezing point of pure water is 0 °C or 273 K, the new freezing point is 273 K - 0.8184 K = 272.18 K or -0.97 °C.The answer is -0.97 °C.

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Among the options provided, the statement that accurately describes a type of potential energy found in a container full of a chemical substance in liquid form is: "The bonds between atoms are one place where potential energy is stored."

In a container filled with a chemical substance in liquid form, the potential energy is primarily stored in the bonds between atoms within the molecules of the substance. These bonds are formed by the sharing or transferring of electrons between atoms, creating a stable arrangement. The potential energy arises from the electrostatic interactions between the charged particles involved in these chemical bonds.When the liquid substance is in its equilibrium state, the potential energy stored in the bonds represents the energy required to break these bonds and separate the atoms, transforming the substance into a different state (such as a gas or a solid).

This potential energy is released when the substance undergoes a chemical reaction or when external forces act upon it.While other forms of potential energy can also exist in a liquid substance, such as kinetic energy due to the speed of the particles or vibrational energy of the atoms within the molecules, these are generally associated with other types of energy rather than potential energy.

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The results of the technician’s combustion experiment do not contradict the law of conservation of mass because some products escaped as gaseous carbon (iv) oxide, water vapor, and other gases.

The statement of the law of conservation of mass states that matter cannot be created nor destroyed, but change from one form to another.

This helps to explain that no loss in mass of a  substance occurs in ordinary chemical reactions, rather, the sum of the masses of the reactants at the beginning of a reaction is equal to the sum of the products at the end of the reaction.

The balancing of chemical equations also follows this law.

Considering the given reaction:

The technician determined the mass of the firewood and oxygen reactants before burning to be 2.72 kg.

At the end of the reaction, after the firewood finished burning, the pile of cooled ash that remained had a mass of 0.095 kg.

When comparing the mass of the reactants and products, the mass of the product seems to be less than the mass of the reactants in contradiction to the law of conservation of mass.

However, there is no loss in mass of the materials because some products escaped in the form of gas into the atmosphere.

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Answer:

D

Explanation:

Answer:

D)  A chemical that's clear when basic and turns color when acidic is correct!

Explanation:

I got it right on a test!

Hope this Helps!! :))

Answer:

1. Hydrogen will diffuse faster.

2. The ratio of diffusion of hydrogen gas to that of the unknown gas is 4 : 1

Explanation:

Let the rate of diffusion of hydrogen gas, H2 be R1

Let the molar mass of H2 be M1

Let the rate of diffusion of the unknown gas be R2.

Let the molar mass of the unknown gas be M2.

Molar mass of H2 (M1) = 2x1 =2g/mol

Molar mass of unknown gas (M2) = 16 times that of H2

= 16 x 2 = 32g/mol

1. Determination of the gas that will diffuse faster. This is illustrated below:

R1/R2 = √(M2/M1)

R1/R2 = √(32/2)

R1/R2 = √16

R1/R2 = 4

Cross multiply

R1 = 4R2

From the above calculations, we can see that the rate of diffusion H2 (R1) is four times the rate of diffusion of the unknown gas (R2).

Therefore, hydrogen will diffuse faster.

2. Again, from the calculations made above, the ratio of diffusion of hydrogen (R1) to that of the unknown gas (R2) is given by;

R1/R2 = 4

Therefore, the ratio of diffusion of hydrogen (R1) to that of the unknown gas (R2) is:

4 : 1

The chemical formula of the gas is Xe

Molar mass of H2 (M₂) = 2 g/mol

Rate of diffusion of H2 (r₂) = ?

Rate of diffusion of X (r₁) = 0.124r₂

molar mass of X (M₁) = ?

To calculate the molar mass of X we use graham's law of diffusion

     \(\frac{r1}{r2} = \sqrt{\frac{M2}{M1} }\)

    \(\frac{0.124r2}{r2} = \sqrt{\frac{2}{M1} }\)

    \({0.124} = \sqrt{\frac{2}{M1} }\)

    0.015 = 2 / M₁

    M₁ = 2 / 0.015

    M₁ = 133.3

133 is near 131.293 g/mol, which is the molar mass of xenon (Xe)

Therefore the chemical formula of the gas HX is Xe.

Complete question:

A gas made up of atoms escapes through a pinhole 0.124 times as fast as H2 gas. write the chemical formula of the gas.

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Answer:

6 unpaired electrons

Explanation:

Answer:

true

Explanation:

To determine which compounds are not true organometallic compounds in the eyes of purists, we need to consider the definition of organometallic compounds.

Organometallic compounds are compounds that contain a direct bond between a carbon atom and a metal atom. Based on this definition, we can evaluate each compound provided:

Compound 1: This compound contains a direct bond between a carbon atom and a metal atom (M), so it is a true organometallic compound.

Compound 2: This compound contains a direct bond between a carbon atom and a metal atom (M), so it is a true organometallic compound.

Compound 3: This compound does not contain a direct bond between a carbon atom and a metal atom. Instead, it has a metal atom (M) coordinated to a ligand (L) without a direct carbon-metal bond. Therefore, it is not considered a true organometallic compound in the eyes of purists.

Compound 4: This compound contains a direct bond between a carbon atom and a metal atom (M), so it is a true organometallic compound.

Compound 5: This compound does not contain a direct bond between a carbon atom and a metal atom. It has a metal atom (M) coordinated to a ligand (L) without a direct carbon-metal bond. Therefore, it is not considered a true organometallic compound in the eyes of purists.

Based on the above analysis, the correct answer is:

D. Compound 3 only

Compound 3 is not considered a true organometallic compound since it lacks a direct carbon-metal bond.

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The enthalpy of formation of the compound is -230.3 kJ/mol.

We know that the heat of formation of a substance can be obtained from the equation; \(C_{8} H_{18} (g)+\frac{25}{2} O_{2} (g)-------- > 8CO_{2}(g)+9 H_{2}O\)(g)ΔH∘rxn=−5093.7 kJ/mol by the use of the Hess law.

Let us now obtain the heats of formation of each of the species in the reaction as we can see them from the species in the reaction equation;

\(CO_{2}\)(g) = -393.5 kJ/mol

\(H_{2} O\)(g) = -241.82 kJ/mol

\(O_{2}\)(g) = 0 kJ/mol

The enthalpy of formation of the compound is now;

8(-393.5) + 9( -241.82) + 5093.7

= -3148 -2176 + 5093.7

= -230.3 kJ/mol

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The scale factor at which the CMB photons had a temperature of 1.9 K is 1.44 times smaller than today's scale factor.

a) At what temperature would today's CMB photons have wavelength in the radio range, say 100 m?The formula for the wavelength-frequency relation is given by:λν=cwhere,λ = wavelengthν = frequencyc = speed of light = 3 × 108 m/sSince the wavelength is given in the question to be 100 m, we can use the formula to find the frequency of CMB photons with a wavelength of 100 m.λ = c / ν100 = 3 × 108 / νν = 3 × 106 HzThe frequency of CMB photons with a wavelength of 100 m is 3 × 106 Hz.

Now, we can use the formula for the Planck distribution to find the temperature at which the photons would have this frequency. It is given by:Bν(T) = 2hc2/λ5 × (exp(hν/kT) - 1)where,Bν(T) = blackbody spectral radiancec = speed of lighth = Planck's constantk = Boltzmann constantT = temperatureSubstituting the values:2hc2/λ5 × (exp(hν/kT) - 1) = Bν(T)2hc2/(100 m)5 × (exp(6.626 × 10-34 × 3 × 106 / (1.38 × 10-23 T)) - 1) = 1.76 × 10-22 W/m2/Hz. The temperature at which the spectral radiance of CMB photons would be 1.76 × 10-22 W/m2/Hz is found by trial and error, and it is T = 1.9 K.

Therefore, CMB photons with a wavelength of 100 m would correspond to a temperature of 1.9 K.b) What would the scale factor be at that point?The relation between temperature and scale factor is given by:T ∝ a-1where, T is the temperature and a is the scale factor.

If the temperature of CMB photons is 1.9 K, then we can use the current temperature of 2.73 K to find the ratio of scale factors.2.73 K / 1.9 K = (a0 / a)where a0 is the scale factor today and a is the scale factor when the CMB photons had a temperature of 1.9 K.The scale factor at that point is:a = a0 × 1.44.

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It is clear that as temperature rises, the kinetic energy of the particles in a perfect atomic gas also rises. This also holds true for actual gases and other ideal gases with more intricate molecular structures.

Heat energy is arbitrarily measured as "temperature" (enthalpy). When a system encounters a higher energy source, the temperature of that system rises as a result.

The result is the transmission of energy as heat, regardless of the source. Heat causes molecules to move more quickly (absorb energy), and some or all of the heat energy is transformed into kinetic energy.

Therefore, the result of heating a gas is a quicker rate of molecular motion. Because of the molecules' more frantic, frenetic mobility and subsequent collisions with the container walls, there is a rise in pressure inside the container.

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Answer:

1 mole of carbon.

Explanation:

Answer:Forces include gravity, friction, and applied force. Force causes changes in the speed or direction of motion.

Explanation:

Answer:

Its force, Just did it. 100%

Explanation:

No explaination needed. I got it right.

Answer:

I think it's False

Explanation:

Explanation:

The amount of water in, on, and above our planet does not increase or decrease because of the water cycle

So it's false

1 mol of H2 gas were produced in the reaction

Zn + 2HCl --> ZnCl2 + H2

This is a single displacement reaction

What is a single displacement reaction?

It is a kind of oxidation-reduction chemical reaction when an ion or element moves out of a compound, i.e., one element is replaced by the other in a compound.

What is mole ratio?

It is the ratio between amounts in moles of any two compounds involved in a balanced chemical reaction.

As we can see mole ratio from the coefficient of balanced reaction:

2 moles of HCl produces 1 mole of H2 gas

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a. Probability (X = 3) = 0.180

b. Probability(X < 3) = 0.676

c. Probability(X >= 3) =  0.324

d. Probability (X >= 1) =  0.865

e. Probability (X >= 5) =  0.0525

(a)  we find the Probability of exactly three insect fragments in a 4-gram sample as :

λ = 0.5 * 4 = 2

P(X = 3) = (e^(-2) * 2^3) / 3!

P(X = 3) =  0.180

(b) Probability of fewer than three insect fragments in a 4-gram sample:

P(X < 3) = P(X = 0) + P(X = 1) + P(X = 2)

P(X < 3) = e^(-2) + (e^(-2) * 2) + (e^(-2) * 2^2)

P(X < 3) = 0.676

(c) Probability of at least three insect fragments in a 4-gram sample:

P(X >= 3) = 1 - P(X < 3)

P(X >= 3) ≈ 1 - 0.676

P(X >= 3) =  0.324

(d) Probability of at least one insect fragment in a 4-gram sample:

P(X >= 1) = 1 - P(X = 0)

P(X >= 1) ≈ 1 - e^(-2)

P(X >= 1) =  0.865

e. The Unusualness of containing five or more insect fragments is found as :

P(X >= 5) = 1 - (P(X = 0) + P(X = 1) + P(X = 2) + P(X = 3) + P(X = 4))

P(X >= 5) = 1 - (0.1353 + 0.2707 + 0.2707 + 0.1805 + 0.0903)

P(X >= 5) ≈ 1 - 0.9475

P(X >= 5) =  0.0525

In conclusion, the probability of a 4-gram sample of this supply of peanut butter containing five or more insect fragments is found to be 0.0525.

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Answer:

Hello There!!

Explanation:

The answer is C.Wind.

hope this helps,have a great day!!

~Pinky~

Answer:

Hello! Your answer is D) All above

Explanation:

Hope I helped! Ask me anything if you have any questions. Brainiest plz!♥ Hope you make a 100%. Have a nice morning! -Amelia♥

The substance that was NOT part of the mixture used in the Urey-Miller experiments is: C. carbon dioxide

The Urey-Miller experiments, conducted in 1952 by Stanley Miller and Harold Urey, aimed to simulate the conditions of early Earth's atmosphere and investigate the formation of organic compounds. The experiments involved creating a mixture of gases thought to be present in the early Earth's atmosphere and subjecting them to electrical discharges to simulate lightning. The purpose was to see if these conditions could produce organic molecules, such as amino acids. The mixture used in the Urey-Miller experiments typically consisted of water (A), hydrogen gas (B), ammonia (D), and methane (E). Carbon dioxide (C) was not part of the original mixture used in these experiments.

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1) List the known quantities.

Sample:

Elements:

Silver: Ag.

Nitrogen: N.

Oxygen: three O.

The compound above has silver, nitrogen, and oxygen.

silver, nitrogen, oxygen.

Answer:

yes

Explanation:

its the correct thing to do

Answer:

6

Explanation:

number of protons equal number of electrons for the atom to be stable

It is the 400 nm photon that has the greater energy by a factor of 1.77.

We know that the wavelength has to do with the horizontal distance that is covered by a wave. We know that the longer the distance that is covered then the weaker the wave. In other words, the wavelength of the wave is inversely proportional to the to the energy of the wave. The greater the wavelength, the lesser the energy.

Let us now find the energy of each of the wavelengths;

E = hc/λ

E = energy of the light

h = Plank's constant

c = speed of light

λ = wavelength

For the  700 nm photon;

E = 6.6 * 10^-34 * 3 * 10^8/ 700 * 10^-9

E = 2.8 * 10^-19 J

For the 400 nm photon;

E = 6.6 * 10^-34 * 3 * 10^8/ 400 * 10^-9

E=  4.95 * 10^-19 J

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Kinetic data refers to information about the rate of a chemical reaction, and it is often presented in the form of graphs. These graphs help us understand how the concentration of reactants and products change over time.

To interpret a graph correctly, it's important to properly label the axes. The x-axis usually represents time, while the y-axis represents the concentration of the reactant or product. In this case, "[B]" would be used to represent the concentration of reactant B.

When interpreting the graph, we can analyze the slope of the curve. A steeper slope indicates a faster reaction rate, while a shallower slope suggests a slower reaction rate. Additionally, the shape of the curve can provide insights into the reaction mechanism.

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The model that should show the corresct representation of xenon gas is one in which the gas molecules  are isolated and monoatomic.

A noble gas is a member of group 18 of the periodic table. Noble gases are known not to interact with each other and occur as monoatomic particles.

The images are not shown here hence the question is incomplete. However, we do know that any of the models that show individual monoatomic particles is a representation of xenon gas.

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Answer:

MRCORRECT has answered the question

Explanation:

13 electrons

So... for the element of ALUMINUM, you already know that the atomic number tells you the number of electrons. That means there are 13 electrons in a aluminum atom. you can see there are two electrons in shell one, eight in shell two, and three in shell three.

7 electrons

So... for the element of NITROGEN, you already know that the atomic number tells you the number of electrons. That means there are 7 electrons in a nitrogen atom. Looking at the picture, you can see there are two electrons in shell one and five in shell two.

The possible compositions of the liquid phases are: \(x_{1} =0.15\) and  \(x_{2} =0.79\), while those of vapor phases are: \(y_{1} =0.2\) and  \(y_{2} =0.7\)

The given binary mixture of ethanol and ethyl acetate at 100 kPa.

Given plot is temperature versus mole fraction (T-xy) at constant pressure 100 kPa.

In the given plot, the upper curve represents the dewpoint curve and lower curve represents bubble point curve.

At a given temperature 74 C, we can determine the mole fractions as follows:

1. We draw a horizontal lie from 74 °C mole fraction 0 to 1 and it touches lower curve at two points and upper curve at two points.

2. We also draw a vertical line from points where it touches the lower curve gives the composition of liquid and draw a vertical line from points where it touches the upper curve gives the vapor compositions.

From the plot given below, the compositions of liquid where the vertical line touches lower curve are: \(x_{1} =0.15\) and \(x_{2} =0.79\)

And those for vapor phases where the line touches the upper curve are:

\(y_{1} =0.2\) and \(y_{2} =0.7\)

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If you add 5 ml of 0.5 M NaOH solution to 20 ml each of buffer B (with a pH of 4.03) and buffer C, the buffer whose pH will change the least is buffer B.

What is a buffer?

A buffer is a solution that resists changes in pH when acid or alkali is added. A buffer solution is a solution that contains a weak acid and its corresponding weak base or a weak base and its corresponding weak acid.

The Henderson-Hasselbalch equation can be used to calculate the pH of a buffer solution before and after adding a strong base or acid.

The equation is pH = pKa + log ([A-]/[HA])

where:pKa is the dissociation constant for the acid[A-] is the conjugate base of the acid when a command (such as NaOH) is added to a buffer solution, the base reacts with the weak acid to form the conjugate base of the acid and water. The addition of the conjugate base of the acid causes the pH of the solution to rising.

When an acid (such as HCl) is added to a buffer solution, the acid reacts with the weak base to form the conjugate acid of the base and water. The addition of the conjugate acid of the base causes the pH of the solution to decrease. Based on the above equation, pH change will be minimum in Buffer B. Therefore, the buffer whose pH will change the least is buffer B.

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Answer:

pH is a measure of hydrogen ion concentration, a measure of the acidity or alkalinity of a solution. The pH scale usually ranges from 0 to 14. Aqueous solutions at 25°C with a pH less than 7 are acidic, while those with a pH greater than 7 are basic or alkaline. A pH level of 7.0 at 25°C is defined as "neutral" because the concentration of H3O+ equals the concentration of OH− in pure water. On the other hand, electrical conductivity is a non-specific measurement of the concentration of both positively and negatively charged ions within a sample. So the short answer to the question is as follows, the presence of any hydrogen ions present in a substance will impact the pH level and most probably influence conductivity levels. However, hydrogen ions make up only a small part of the ion concentration measured by a conductivity meter.