An atom emits a photon with energy 7.13 electronvolts (eV). What is the wavelength of the photon?
a. 279 nm
b. 174 nm
c. 114 nm
d. 108 nm​

When the two atoms in such a covalent polar bond share the bond's electrons unequally.

The smallest elemental component of an atom, the electron has a negative charge. In a neutral atom, there are an equal amount of protons and electrons. A electrons and one proton are all that the hydrogen atom has. On the contrary hand, the uranium atom possesses 92 protons, which means 92 electrons.

The negatively charged components of an atom are called electrons. The total negative charge of an atom's electrons counteracts that positive charge of its protons inside the atomic nucleus.

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The identity of the gas is C. O2 (oxygen). At standard temperature and pressure(STP), which is defined as 0 degrees Celsius (273.15 Kelvin) and 1 atmosphere (101.325 kilopascals), the volume occupied by one mole of any gas is 22.4 liters.

In this case, we have a 32 gram sample of gas that occupies 22.4 liters at STP. To determine the identity of the gas, we need to calculate the number of moles present in the sample.

To do this, we use the ideal gas law equation: PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature.

Since we know the volume (22.4 L) and STP conditions, we can rearrange the equation to solve for the number of moles: n = PV/RT. Plugging in the values for P, V, R, and T, we get: n = (1 atm)(22.4 L) / (0.0821 L·atm/(mol·K))(273.15 K).

Evaluating this expression gives us approximately 1 mole. Therefore, the 32 gram sample of gas is equivalent to 1 mole. The molar mass of oxygen (O2) is approximately 32 grams/mol, which matches the given mass. Hence, the identity of the gas is O2 (oxygen).

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Answer:

About 0.054 moles.

Explanation:

Apply the ideal gas law. Recall that:

\(\displaystyle PV = n RT\)

Solve for n, the number of moles:

\(\displaystyle n = \frac{PV}{RT}\)

Determine the pressure of the hydrogen gas. Recall that by Dalton's Law of Partial Pressures, the total pressure is equal to the sum of the partial pressures of each individual gas:

\(\displaystyle P_T = P_\ell + P_\text{H$_2$}\)

Convert the vapor pressure of the liquid to atm (1.00 atm = 760. torr):

\(\displaystyle 18\text{ torr} \cdot \frac{1.00\text{ atm}}{760.\text{ torr}} = 0.024\text{ atm}\)

Therefore, the partial pressure of the hydrogen gas is:

\(\displaystyle \begin{aligned} P_T & = P_\ell + P_\text{H$_2$} \\ \\ (0.788\text{ atm}) & = (0.024\text{ atm}) + P_\text{H$_2$} \\ \\ P_\text{H$_2$} & = 0.764\text{ atm}\end{aligned}\)

Therefore, the number of moles of hydrogen gas present is (the temperature in kelvins is 273.15 + 20.0 = 293.2 K):

\(\displaystyle \begin{aligned} n & = \frac{PV}{RT} \\ \\ & = \frac{(0.764\text{ atm})(1.7\text{ L})}{\left(0.08206 \text{ }\dfrac{\text{L-atm}}{\text{mol-K}}\right)(293.2\text{ K})}\\ \\ & = 0.054\text{ mol H$_2$} \end{aligned}\)

CuSO4 is soluble in water but ferric oxide is not soluble in water.

Ferric oxide is an insoluble oxide hence it does not dissolve in water. Since the substance is insoluble in water, it exists as solid particles when added to water. When this mixture is filtered,  ferric oxide is separated from water.

On the other hand, copper (II) sulfate is quite soluble in water hence it can not be separated from water by filtration since it dissolves completely in water. Hence, copper (II) sulfate can not be separated from water by filtration but ferric oxide can be separated from water by filtration.

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Answer:

Atomic number

Explanation:

Because atomic number is unique for each element and never changes

Answer:

Explanation:

given mass on earth =98 kg

gravitational pull on mars =3.711 m/s2

gravitational pull on venus =8.87 m/s2

weight of the body on mars =weight on earth/9.81 m/s2 *3.711 m/s2

W=98 kg*3.711 /9.81m/s2

W=37.07 kg

weight on the venus =weight on earth*8.87 m/s2 /9.81 m/s2

W= 98 kg*7.87 m/s2/9.81 m/s2

W=78.62 kg

The Lewis structure for elemental nitrogen consists of a triple bond between the nitrogen atoms.

In the Lewis structure of elemental nitrogen (N2), there is a triple bond between the nitrogen atoms. This is represented by three lines connecting the nitrogen atoms, indicating the sharing of three pairs of electrons. Each nitrogen atom contributes three valence electrons, and the triple bond allows each nitrogen atom to achieve a stable octet configuration by sharing a total of six electrons. This arrangement satisfies the octet rule, which states that atoms tend to gain, lose, or share electrons in order to achieve a full outer electron shell with eight electrons. Therefore, the correct choice is "a triple bond between the nitrogen atoms" as the Lewis structure for elemental nitrogen.

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Answer:

I kinda forgot. I'm sorry if I didn't answer your question.

Explanation:

Answer:

don't know

Explanation:

Thanks❤ have a nice day

Answer:

Liquid

Explanation:

Octane is a straight chain alkane composed of 8 carbon atoms. It has a role as a xenobiotic. N-octane is a colorless liquid with an odor of gasoline.

The structure of n‑methyl‑2‑pyrrolidone when it is heated with aqueous acid. product is given below

A polar solvent without an acidic proton is known as a polar aprotic solvent. These solvents don't include hydroxyl or amine groups. These solvents can act as proton acceptors, but unlike protic solvents, they do not act as proton donors in hydrogen bonding.

After being exposed to a strong aqueous acidic media and being heated, N-methyl-2-pyrrolidone opens up, forming a molecule with a carboxylic group at one end and a protonated nitrogen atom with a methyl group connected to it at the other.

Alcohol, water, hydrogen fluoride, formic acid, acetic acid, ammonia, methanol, ethanol, and other well-known substances are a few examples of polar protic solvents. Polar aprotic solvents, on the other hand, lack acidic protons and do not function as donors during hydrogen bonding.

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Answer:

C: atomic mass

Explanation:

Answer:Atomic mass

Explanation:

Explanation:

it is the one you have selected because it is the only solid one

I think the answer is A. I know it's Planet X.

During the formation of the ionic compound magnesium sulfide, a magnesium atom donates two electrons to a sulfur atom to make a magnesium ion and a sulfide ion that are then attracted to each other by electrostatic forces.

An ionic bond between two oppositely charged ions that are created as a consequence of the complete transfer of one or more electrons exhibits the electrostatic force of attraction.

An example of an ionic compound is magnesium sulfide formed when a magnesium atom donates two electrons to a sulfur atom to form cations and anions held together by electrostatic forces of attraction.

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The mathematical expression for h is v²/(2g) which is based on conservation of energy and the correct option is option B.

The law of conservation of energy states that energy can neither be created nor be destroyed. Although, it may be transformed from one form to another.

Example, when a fruit is falling to the bottom, potential energy is getting converted into kinetic energy.

Conservation of energy implies

KEinitial = PEfinal

mv²/2 = mgh

therefore, h = v²/2g.

Thus, the ideal selection is option B.

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The pair of cations out of which one will form a precipitate and the other will not be able to the pair that can be distinguished on the addition of sodium chloride :

1) Barium and Lead → Barium will not form a precipitate but Lead will form PbCl₂. Thus this can be distinguished.

2) Barium and Alumunium → Both will not form a precipitate.

3) Lead and Silver → Both will give precipitate so cant is distinguished.

4) Iron and Calcium → Both will not form a precipitate.

Solubility is described because the maximum amount of a substance on the way to dissolve in a given amount of solvent at a targeted temperature.

Solubility can be categorized into 3 classes. Those are soluble, partly soluble, or insoluble. A soluble solute has a solubility of extra than 1g in step with a hundred ml of solvent.

Solubility is described as the most quantity of a substance that can be absolutely dissolved in a given quantity of solvent and represents an essential idea in fields of research which include chemistry, physics, meals technological know-how, pharmaceutical, and organic sciences.

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Answer:

I can't understand your language? can you write in English

I'm sorry

Agar is a complex polysaccharide derived from a seaweed.

Agar is a jelly-like substance that is used to culture bacteria and other microbes in the laboratory. It is a non-nutrient material that is used to provide a surface for the bacteria to grow on.

Agar is also used as a gelling agent in foods such as jams and jellies, as well as in the preparation of solid media for microbiological applications.

The structure of agar is composed of repeating units of galactose and 3,6-anhydrogalactose, linked together by glycosidic bonds.

It is a linear polymer of approximately 150 kDa.

Agar is a hydrophilic molecule, meaning that it attracts water molecules, which contributes to its ability to form gels.

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The energy of the photon with a wavelength of 46.1 nm is approximately 26.9 electron volts (eV).

To calculate the energy of a photon with a given wavelength, we can use the equation E = hc/λ, where E is the energy, h is Planck's constant (6.626 x 10^-34 J·s), c is the speed of light (3.00 x 10^8 m/s), and λ is the wavelength.

First, we convert the given wavelength of 46.1 nm to meters by dividing it by 10^9. Then, we substitute the values into the equation to find the energy in joules. Finally, we convert the energy from joules to electron volts (eV) by dividing it by the conversion factor 1.602 x 10^-19 J/eV.

The given wavelength is 46.1 nm, which can be converted to meters as follows:

46.1 nm * (1 m / 10^9 nm) = 4.61 x 10^-8 m

Using the equation E = hc/λ, we can calculate the energy in joules:

E = (6.626 x 10^-34 J·s * 3.00 x 10^8 m/s) / (4.61 x 10^-8 m) = 4.32 x 10^-18 J

To convert the energy from joules to electron volts, we divide by the conversion factor:

4.32 x 10^-18 J * (1 eV / 1.602 x 10^-19 J) = 26.9 eV

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Answer:

Visible wavelengths range from 0.0007 milimeters for red light, through orange, yellow, green, and blue, to 0.0004 milimeters for violet light.

Ultraviolet is shorter wavelengths than violet.

Hope This Helps.

Answer:

The orest one is possible D

Explanation:

The product(s) for each reaction sequence are as follows:

CH2CH2OH -> CH2=CH2 + H2O

PCC (pyridinium chlorochromate) does not react further with the product CH2=CH2, so no additional products are formed.

(CH3)2NH and NaBH4 in CH3OH are reducing agents and convert the carbonyl compound to its corresponding alcohol. Therefore, no reaction occurs with CH2=CH2.

AlCl3 does not react with CH2=CH2, so no additional products are formed. PBr3 (phosphorus tribromide) reacts with CH2=CH2 to form CH2BrCH2Br. Mg/ether (Grignard reagent) reacts with CH2BrCH2Br to form CH2MgBrCH2MgBr.

HCl reacts with CH2MgBrCH2MgBr to form CH3CH2CH2MgBr + MgCl2.

H3O+ (hydronium ion) reacts with CH3CH2CH2MgBr to form CH3CH2CH2OH + MgBr+.

CH2CH2OH undergoes oxidation with PCC (pyridinium chlorochromate) to form CH2=CH2 (ethylene) and water (H2O). PCC does not react further with CH2=CH2, so no additional products are formed.

(CH3)2NH (dimethylamine) and NaBH4 in CH3OH are reducing agents that convert carbonyl compounds to alcohols. However, CH2=CH2 does not have a carbonyl group, so no reaction occurs.

AlCl3 does not react with CH2=CH2, so no additional products are formed.

PBr3 reacts with CH2=CH2 through an electrophilic addition reaction to form CH2BrCH2Br (1,2-dibromoethane).

Mg/ether, known as a Grignard reagent, reacts with CH2BrCH2Br to form CH2MgBrCH2MgBr.

HCl reacts with CH2MgBrCH2MgBr to form CH3CH2CH2MgBr (ethylmagnesium bromide) and MgCl2.

H3O+ reacts with CH3CH2CH2MgBr to form CH3CH2CH2OH (1-propanol) and MgBr+.

The reaction sequence results in the formation of CH2=CH2, CH2BrCH2Br, CH2MgBrCH2MgBr, CH3CH2CH2MgBr, and CH3CH2CH2OH as the products. Each step involves specific reactions and reagents that lead to the formation of these products.

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Answer:

rest will do later mom is calling me plz understand promise will do it

Explanation:

Answer:

lol

Explanation:

its 5 points

We think that our dependency is primarily on non-renewable energy sources because these resources are required and important for our daily lives.

We depend on non-renewable energy for example fossil fuels resource because of the reason that they are energy-rich and comparatively cheap to process. But a big problem with fossil fuels resource, apart from them being in limited supply, is that burning them releases carbon dioxide into the atmosphere.

We think today that humanity's use of fossil fuels resource is damaging our environment. Fossil fuels resource which is non-renewable energy cause pollution where they are produced and used, and their continuous use is causing long-term harm to the climate of our planet.

So we can conclude that our dependence on nonrenewable energy sources makes sense because our lives depend on them.

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The pH of the resulting solution is 2.98. Option B is Correct.

The pH of a solution is a measure of its acidity or basicity, on a scale of 0 to 14. The pH of a solution is calculated by taking the negative logarithm of the hydrogen ion (H+) concentration.

The pH of the resulting solution, we need to know the concentration of H+ ions in the initial solution and in the final solution. We can use the following equation to calculate the pH:

pH = -log[H+]

The initial concentration of H+ ions is 0.010 M, and the final volume of the solution is 100.0 mL. To find the concentration of H+ ions in the final solution, we can use the formula:

[H+] = [solute] * V

here [solute] is the concentration of the HCl and V is the volume of the solution.

The concentration of HCl in the initial solution is not given, but we can assume it is also 0.010 M. Therefore, the concentration of H+ ions in the final solution is:

[H+] = 0.010 M * 100.0 * 2.98 mL

= 2.98 mM

The pH of a solution can be calculated using the following equation:

pH = -log[H+]

pH = -log(2.98 mM)

pH = 2.98

Therefore, the pH of the resulting solution is 2.98. Option B is Correct.

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(i) The initial reaction rate is \(2*10^{-4} mol litre^{-1} sec^{-1.\)

(ii) The half-life period of the reaction is 1386 seconds.

(iii) The time taken to complete 75% of the reaction is approximately 2772 seconds.

We can use the first-order rate equation:

Rate = k[N2O5]

Where:

Rate is the reaction rate,

k is the rate constant,

[N2O5] is the concentration of N2O5.

Given:

Rate constant (k) = \(5*10^{-4} sec^{-1}\)

Initial concentration of N2O5 =\(0.4 mol litre^{-1}\)

(i) To find the initial reaction rate:

Substitute the given values into the rate equation:

Rate = k[N2O5]

Rate = \((5*10^{-4} sec^{-1})(0.4 mol litre^{-1})\)

Rate = \(2*10^{-4} mol litre^{-1} sec^{-1}\)

The initial reaction rate is \(2*10^{-4} mol litre^{-1} sec^{-1}\).

(ii) To find the half-life period:

The half-life of a first-order reaction is given by the equation:

t(1/2) = (0.693 / k)

Substitute the given value of k into the equation:

t(1/2) = \((0.693 / 5*10^{-4} sec^{-1})\)

t(1/2) = 1386 sec

The half-life period of this reaction is 1386 seconds.

(iii) To find the time taken to complete 75% of the reaction:

The time required to complete a certain percentage of a reaction can be found using the equation:

t = (ln(1 / (1 - x)) / k)

Where x is the fraction of the reaction completed (in this case, 75%).

Substitute the given values into the equation:

t =\((ln(1 / (1 - 0.75)) / 5*10^{-4} sec^{-1})\)

t = 2772 sec

The time taken to complete 75% of the reaction is approximately 2772 seconds.

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Answer:

Oxygen has an atomic number of 8 , and the mass number of an atom is the sum of its atomic number plus its neutron number. We got the mass as 16 units, and so it'll have 16−8=8 neutrons.

Explanation: