Question 3 of 25
What is the correct electron configuration for an element with 5 electrons in
the third energy level?
A. 1s22s22p63s¹3p³3d¹
B. 1s22s22p 3s23p³
C. 1s22s22p63s23p5

The minimum energy needed by the photons to react with silver bromide in the film is approximately 57.9 kJ/mol. Then, the wavelength is 206 nm.

Wavelength of a wave is the distance between two consecutive crests or troughs of the wave.

To find the wavelength of the energy in nm, we can use the equation:

E = hc/λ

where E is the energy in joules, h is Planck's constant (6.626 x 10⁻³⁴ J s), c is the speed of light (2.998 x 10⁸ m/s), and λ is the wavelength in meters.

First, we need to convert the energy from kJ/mol to J/photon:

57.9 kJ/mol = 57.9 x 1000 J/mol / 6.02 x 10²³ mol^-1

= 9.626 x 10²⁰ J/photon

Now we can use the equation above to find the wavelength:

9.626 x 10²⁰ J/photon = (6.626 x 10⁻³⁴ J s)(2.998 x 10⁸ m/s) / λ

Solving for λ, we get:

λ = hc/E = (6.626 x 10⁻³⁴ J s)(2.998 x 10^8 m/s) / 9.626 x 10⁻²⁰J/photon

  = 2.06 x 10⁻⁷ m

Finally, we convert the wavelength from meters to nanometers:

λ = 2.06 x 10⁻⁷ m x (10⁻⁹ nm/m)

  = 206 nm

Therefore, the wavelength of the energy needed to react with silver bromide in 35 mm photographic film is approximately 206 nm.

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Answer

1.50 mol

Explanation

Given:

Initial volume, V₁ = 25.0 L

Mass of CH4 gas in 25.0 L container = 40 g

Final volume, V₂ = 15.0 L

From the Periodic Table; molar mass of CH4 = 16.04 g/mol

What to find:

The new amount in mole.

Step-by-step solution:

According to Avogadro’s law: For a confined gas, the volume (V) and number of moles (n) are directly proportional if the pressure and temperature both remain constant. That is:

n₁ = Mass/Molar mass = (40.0g/16.04 g/mol) = 2.493765586 mol

n₂ is the new amount in mole and can be calculated as follows:

The new amount in moles is 1.50 moles

Answer:

Possible rapid deterioration of natural habitats where phytoplankton and seaweed exist.

Explanation:

Certain basic building blocks are needed for nautical environments to thrive. Assuming, in this context, without most of a certain type of oceanic species, the remaining habitats will suffer.

Answer:

It would be 95.3

Explanation:

Answer:

Every atom has no overall charge (neutral). This is because they contain equal numbers of positive protons and negative electrons. These opposite charges cancel each other out making the atom neutral.

Explanation:

Answer:

a

Explanation:

Answer:

Gain 3 electrons.

Explanation:

If element X have 5 valence electrons it will more than likely gain 3 electrons to fill its octet to become stable. Gaining the 3 electrons is much easier for the atom than if it were to give away it's 5 valence electrons. Elements with 5 valence electrons that could represent element X are:

Answer:

options 3rd is the correct answer

The number of atoms in 3 moles K of the particle is 1.806 x 10²⁴ atoms.

The value of one mole of an atom is equal to exactly 12 grams of pure carbon-12.

12.00 g (C-12 ) = 1 mol C-12 atoms = 6.02 × 10²³ atoms .

The number of particles in 1 mole is called Avogadro's Number (6.0221421 x 10²³).

The number of atoms in 3 moles K of the particle is calculated as follows;

= 3 moles  x   6.02 × 10²³ atoms / mol

= 1.806 x 10²⁴ atoms

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mass of helium = 18.6 g. To answer this question, we can use the ideal gas law, which relates the pressure, volume, temperature, and amount of a gas.

According to 1, the ideal gas law is often written as:

PV = nRT

where P is the pressure of the gas, V is the volume of the gas, n is the number of moles of the gas, R is the ideal gas constant and T is the temperature of the gas.

We are given the values of P, V and T, and we need to find n. We can rearrange the equation to solve for n:

n = PV/RT

We also need to make sure that we use consistent units for P, V, T and R. According to 2, if we use R = 8.31 J/K/mol, then we must use P in pascals (Pa), V in cubic meters (m³), and T in kelvins (K).

We can convert the given values to these units as follows:

P = 1.89 x 10³ kPa x 10³ Pa/kPa = 1.89 x 10⁶ Pa

V = 685 L x 10⁻³ m³/L = 0.685 m³

T = 62°C + 273.15 = 335.15 K Plugging these values into the equation for n, we get:

n = (1.89 x 10⁶ Pa) x (0.685 m³) / (8.31 J/K/mol) / (335.15 K)

n = 4.64 mol

To find the mass of helium in grams, we need to multiply n by the molar mass of helium, which is 4 g/mol according to 3. Therefore,

mass of helium = 4.64 mol x 4 g/mol = 18.6 g

Rounding to three significant digits, we get:

mass of helium = 18.6 g

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Answer:

1. The first model.

2. The second model.

Explanation:

In a Bohr Model, you have your nucleus in the middle, in #1, it's the relatively large black circle, and in #2, it is the large grey dot with the number of protons & neutrons in the center. Now the first ring of a Bohr Model can hold a maximum of 2 electrons. The second ring of a Bohr Model can hold a maximum of 8 electrons. If the element has more than 10 electrons, there will be a third ring (as is shown on your worksheet), and the third ring can hold a whopping 18 electrons!

Using that background, let's begin!

In question #1, looking at the first model shown, there are 2 electrons on the first ring, 3 electrons on the second ring, and 4 electrons on the third ring. The issue with this is that you must max out the number of electrons on a ring before moving to the next. If the model were to be correct, there would be 2 electrons on the first ring, and 7 electrons on the second - no third ring needed! The second model checks out in #1, as there are 2 on the first ring, and 7 on the second.

In question #2, the first model shows 2 electrons on the first ring, 8 electrons on the second ring, and 2 electrons on the third ring. This checks out! The second model in question #2 is showing 2 electrons on the first ring, and a whopping 11 electrons on the second ring - that's no good! If the model were to be correct, there would be 2 electrons on the first ring, 8 electrons on the second ring, and 1 electron on the third ring.

Answer:

Explanation:

Potassium iodide reacts with oxygen in presence of water to produce potassium hydroxide and potassium diiodoiodate(I) .

5KI + 2H₂O + O₂ =4 KOH + I₂ + K(II₂) .

Answer:

protons are +1

Explanation:

protons are positive 1 while electrons are -1, they are equal but opposite charge

In the rumen, the carbohydrate fermentation end products include all the above options i.e. acetate, carbon dioxide and methane.

In the rumen, which is a specialized stomach chamber of ruminant animals, the fermentation of carbohydrates by microorganisms produces various end products. These end products include acetate, carbon dioxide, and methane.

Acetate: Acetate is a volatile fatty acid (VFA) produced during carbohydrate fermentation in the rumen. It is an important energy source for the animal, as it can be absorbed from the rumen and utilized as fuel by the animal's body.

Carbon Dioxide: Carbon dioxide (CO2) is a byproduct of fermentation in the rumen. It is released as a gas during microbial metabolism and contributes to the overall gas production in the rumen.

Methane: Methane (CH4) is another byproduct of carbohydrate fermentation in the rumen. It is produced by certain groups of microorganisms called methanogens. Methane is released as a gas and can be expelled by the animal through eructation (belching).

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Answer:

The correct answer is D. B = +3; H = -1.

To draw the Lewis dot structure of the BH4 ion, we first determine the total number of valence electrons:

B: 3 valence electrons

H: 1 valence electron x 4 = 4 valence electrons

Total: 3 + 4 = 7 valence electrons

The single B atom is the central atom, and the four H atoms are attached to it. Each H atom forms a single bond with the B atom, which uses up 4 valence electrons:

H H

| |

H-B-H

|

H

We have 3 valence electrons left, which we place around the central B atom as lone pairs:

H H

| |

H-B-H

| |

H--

Each H atom has a full valence shell (2 electrons), and the B atom has an octet (8 electrons). However, the B atom now has 5 valence electrons, which gives it a formal charge of +3. Each H atom now has only 1 valence electron, which gives it a formal charge of -1. The sum of the formal charges in the BH4 ion is 0, as it should be for a neutral molecule/ion.

Answer:

Rust, iron oxide, is weak mechanically although its chemical bonds are strong.

Explanation:

Long-term heat loss to the calorimeter is a problem, especially for slow-moving processes.

The water iscontained in a tank whose thermal capacity and weight were predete partially rmined before the experiment began. Calculating heat and flow rates involves measuring the rise in water temperature and volume over a predetermined period of time.

In contrast, if the reaction absorbs heat, heat is transmitted from the calorimeter to the system, lowering the calorimeter's temperature.

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(a) It will take approximately 6.64T years for the activity to reduce to 3.125% of its original value.

(b) It will take approximately 4.62T years for the activity to reduce to 1% of its original value.

(a) To determine the time it takes for the activity to reduce to 3.125% of its original value, we use the concept of half-life. In one half-life, the activity reduces to 50% of its original value. So, for the activity to reduce to 3.125% (which is 1/32 of the original value), it would take 5 half-lives. Each half-life is equal to T years, so 5 half-lives would be 5T years. Therefore, it will take approximately 6.64T years (5 times the half-life) for the activity to reduce to 3.125% of its original value.

(b) Similar to the previous explanation, to determine the time it takes for the activity to reduce to 1% of its original value, we use the concept of half-life. Since 1% is 1/100 of the original value, it would take approximately 7 half-lives for the activity to reduce to 1% (1/100). Therefore, it will take approximately 4.62T years (7 times the half-life) for the activity to reduce to 1% of its original value.

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burninh fossil fuels is not an example

Answer:

Gravity

Explanation:

Gravity is not a form of mechanical energy used in power plants

Answer:There are 1.51 × 1024 atoms

Explanation: