Which is the electron configuration for boron?
A.1s22s3
B.1s22s23s
C.1s'2s²2p?
D.1s22s²2p?

Answer:

V = 43.95 L

Explanation:

Given data:

Mass of CH₄ decomposed = 15.63 g

Volume of H₂O produced at STP = ?

Solution:

Chemical equation:

CH₄ + 2O₂    →       2H₂O  + CO₂

Number of moles of CH₄:

Number of moles = mass/molar mass

Number of moles = 15.63 g/ 16 g/mol

Number of moles = 0.98 mol

Now we will compare the moles of H₂O with CH₄.

                         CH₄              :              H₂O

                           1                 :                2

                        0.98             :            2×0.98 = 1.96 mol

Volume of hydrogen:

PV = nRT

1 atm × V = 1.96 mol × 0.0821 atm.L/mol.K × 273.15 K

V = 43.95atm.L / 1atm

V = 43.95 L

Explanation:

It is the emission of electron from a metal under the effect of light is known as photo electric effect

I hope this imformation help full for you

Answer:

Using atomic spectra selection rules for electronic excitations, determine the electron configurations and their associated term symbols for the two lowest-lying electronic excited states for a hydrogen atom. (Starting from the ground electronic state, determine what the two lowest energy electronic excitations are possible.) Indicate which will have the lower energy.

Explanation:

Using atomic spectra selection rules for electronic excitations, determine the electron configurations and their associated term symbols for the two lowest-lying electronic excited states for a hydrogen atom. (Starting from the ground electronic state, determine what the two lowest energy electronic excitations are possible.) Indicate which will have the lower energy.

➢ A neutralization reaction can be defined as a chemical reaction in which an acid and base quantitatively react together to form a salt and water as products.

➢In a neutralization reaction, there is a combination of H+ ions and OH– ions which form water. A neutralisation reaction is generally an acid-base neutralization reaction.

Neutralization Reaction Equation:-

Neutralization Reaction Examples:-

________________________________

Answer: A reaction that removes essentially all H+ and OH-

Explanation:

Answer:

5.92 g

Explanation:

Convert milliliters to liters.

217 mL = 0.217 L

Since molarity (M) is moles per liter(mol/L), multiply the molarity by the volume to find out how many moles you will need.

0.217 L × 0.246 M = 0.05338 mol

Now, convert the moles to grams using the molar mass.  The molar mass of calcium chloride is 110.98 g/mol.

0.05338 mol × 110.98 g/mol = 5.924 g ≈ 5.92 g

You will need 5.92 g of calcium chloride.

When the volume of the system is decreased, the pressure will increase, causing the reaction to shift in the direction that produces fewer gas molecules. In this case, the reaction shifts towards the formation of CO2, increasing the concentration of all species (CO, O2, and CO2).

After each event listed, the changes in concentration for each species to reach equilibrium can be determined:

Increasing the concentration of CO:

CO will decrease (↓)

O2 will not change (blank)

CO2 will increase (↑)

Increasing the concentration of CO2:

CO will not change (blank)

O2 will not change (blank)

CO2 will increase (↑)

Decreasing the volume of the system:

CO will increase (↑)

O2 will increase (↑)

CO2 will increase (↑)

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Answer:

wouldnt they still have the same density?

Explanation:

for example, the density of iron is 7.874 g/cm^3 no matter how big the piece is. I hope this helps.

Answer:

Fossils & common ancestors

Explanation: Fossils provide evidence that evolution has taken place by fossil records. Fossil records provide evidence species have changed over time. Hope this helped! :)

It will it take 0.684 billion year for 10% of the U−238 atoms in a sample of U−238 to decay.  If a sample of U−238 initially contained 1.4×1018 atoms when the universe was formed 13.8 billion years ago, there gonna be 1.67 x 10¹⁷ left today.

Half life (t1/2) = 4,5 billion years

10% to decay = 90 % remaining

ln (C/C₀) = - kt

where k is constant

t is time

K = ln(2) / t1/2 = ln(2) / 4.5

so C/C₀ = 0.9

a.)ln (C/C₀) = - kt

ln (0.9) = - ln(2) / 4.5  x t

t = 0.684 billion years

b.) C₀ in initial sample = 1.4 x 10¹⁸

t = 13.8 billion years

ln (C/C₀) = - kt

ln (C/C₀) = - 0.15403 x 13.8

ln (C/C₀) = -2.125

C= C₀ e⁻² ¹²⁵

C = 1.4 x 10¹⁸ x 0.1194 = 1.67 x 10¹⁷

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Answer:

There are 6

Explanation:

The significant figures in that number are  5 4 0 0 4 7

Hope this helps:)

A methane molecule (CH4) is considered symmetrical because it possesses a symmetric structure and exhibits symmetry operations.

Symmetry refers to a balanced arrangement of elements that can be divided into equal parts by a plane, axis, or center. In the case of methane, it exhibits several symmetrical characteristics.

Firstly, methane has a tetrahedral molecular geometry, with the carbon atom at the center and four hydrogen atoms positioned around it. This geometry ensures that the molecule is symmetrical in terms of its spatial arrangement.

Each hydrogen atom is located at one of the vertices of the tetrahedron, forming equal angles and distances with respect to the central carbon atom. This symmetry is maintained regardless of the orientation of the molecule.

Additionally, methane possesses rotational symmetry. It can be rotated around any of the carbon-hydrogen bonds, and the molecule will retain its overall appearance.

The symmetry of methane arises from its molecular structure and the equal distribution of electron density around the central carbon atom. The four hydrogen atoms are bonded to the carbon through sigma bonds, which have a cylindrical symmetry. This balanced arrangement of the atoms contributes to the overall symmetry of the molecule.

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Answer: D. They would device an experiment that could test the two scientists conclusions.

Explanation:

The results of the scientific study must be verified by peer scientists or members of the scientific community to proof whether the research has been conducted produce a valid evidence.

In the given situation, the two scientists had developed different conclusion for the same experiment. This may mean either of the two may have put up an incorrect conclusion.

The scientific community may address this issue by performing the experiment. Every scientific conclusion is based upon the results of the experimental approach.

Answer:d

Explanation:

The type of crude oil that is considered to be the highest quality for gasoline is West Texas Intermediate (Option B).

Oil is a fossil fuel obtained from Earth's crust, which is fundamental nowadays to generate electricity.

West Texas Intermediate is a highly pure and high-type energy source of crude oil used in industry.

In conclusion, the type of crude oil that is considered to be the highest quality for gasoline is West Texas Intermediate.

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Answer:

send a pic or more info

Explanation:

1. The constituent gases of air are:

2. The surrounding air is not seen with the eyes because it is transparent. Air molecules are not visible to the na-ked eye, and they do not scatter or absorb visible light significantly. Therefore, air appears colorless and transparent.

3. To prove that air supports burning, you can perform an experiment with a burning candle. Place a glass jar or bell jar over a lit candle, ensuring that the jar is airtight. As the candle burns, it consumes oxygen from the air inside the jar. Eventually, the candle flame will go out due to the lack of oxygen, proving that air (specifically oxygen) is necessary for burning.

4. To show that air occupies space, you can perform a simple experiment using a plastic bottle or syringe. Fill the bottle or syringe with water, ensuring there are no air bubbles. Then, cover the opening tightly and try to compress the air inside. You will find that it is not possible to compress the air significantly, indicating that air occupies space.

5. To prove that air has weight, you can use a sensitive balance or scale. Weigh an airtight container or balloon, and then fill it with air. The weight of the container or balloon with the added air will be greater than its initial weight, demonstrating that air has weight.

6. Air is useful to us in various ways. Three points highlighting the importance of air are:

7. Three properties of air include:

Air exerts force in various ways. For example, air pressure allows objects like airplanes to fly by providing lift. Air resistance or drag opposes the motion of objects moving through the air, creating a force that can affect their speed and trajectory.

8. Four effects of air pollution include:

9. Causes of pollution:

10. Two control measures for air pollution include:

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Answer:

D

Explanation:

the correct answer is d

Answer:

d

Explanation:

Its just seem like NaCl structure

The fill in the blanks about cell cycle from the task given above are correctly filled below as follows:

Cell cycle can simply be defined as a process which is concerned about the division of the cell to divide into two different daughter cells.

That being said, cell cycle comprises of different phases.

In conclusion, we can now confirm and deduce from all explanations given above that mitosis and mitosis are two different cell division processes.

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The electron configuration for the ion formed by the element magnesium, Mg is 1s²2s²2p⁶ by assuming that the octet rule is obeyed. Therefore, option A is correct.

The octet rule refers to atoms' preference for having eight electrons in their valence shell. Atoms with fewer than eight electrons are more likely to react and form more stable compounds.

The Mg atom will achieve an octet by losing its two outermost electrons and thus gaining 2+ charges, according to the octet rule. Because Mg belongs to the alkali metal group, it will lose electrons rather than gain them.

We know that when an atom completes its octet., electrons in its valence shell, it becomes stable. Now, electrons must be given out in magnesium ion valence to complete its octet.

Thus, The electron configuration for the ion formed by the element magnesium, Mg is 1s²2s²2p⁶. Option A is correct.

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Your question is incomplete, most probably your question was

assuming that the octet rule is obeyed, write out the electron configuration for the ion formed by the element magnesium, Mg

A. 1s²2s²2p⁶

B.  1s²2s²2p²

C.  1s²2s²2p₅

D.  1s²2s²2p¹

The mass of oxygen that is required for this reaction is 0.15 g.

We know that we could use the stoichiometry of the reaction to be able to obtain the relationship between the reactants and the products. We only have to ensure that the reaction equation as written is balanced. In this case, we have; \(4Fe^{2+}(aq) + 3O_{2} ---- > 2Fe_{2} O_{3}\).

Now the number of moles of the iron is obtained as;

85/1000 L * 0.0750 M = 0.0064 moles

Now;

4 moles of iron II reacts with 3 moles of oxygen

0.0064 moles reacts with 0.0064 moles * 3 moles/4 moles

= 0.0048 moles

Mass of oxygen consumed =  0.0048 moles * 32 g/mol = 0.15 g

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Answer:

0.606 g of KNO₃.

Explanation:

We'll begin by converting 300 mL to L. This can be obtained as follow:

1000 mL = 1 L

Therefore,

300 mL = 300 mL × 1 L / 1000 mL

300 mL = 0.3 L

Next, we shall determine the number of mole of KNO₃ in the solution. This can be obtained as follow:

Volume = 0.3 L

Molarity of KNO₃ = 0.020 M

Mole of KNO₃ =?

Mole = Molarity x Volume

Mole of KNO₃ = 0.020 × 0.3

Mole of KNO₃ = 0.006 mole.

Finally, we shall determine the mass of 0.006 mole of KNO₃. This can be obtained as follow:

Mole of KNO₃ = 0.006 mole.

Molar mass of KNO₃ = 39 + 14 + (16×3)

= 39 + 14 + 48

= 101 g/mol

Mass of KNO₃ =?

Mass = mole × molar mass

Mass of KNO₃ = 0.006 × 101

Mass of KNO₃ = 0.606 g

Thus, 0.606 g of KNO₃ is needed to prepare the solution.

Answer:

1.09

Explanation:

Keep in mind that the volume of the solution changes during this titration, so to compute the amount of hydronium that is neutralized during this addition of base (in order to calculate the final pH of the solution), we must calculate the moles of all species in solution initially present. Because both NaOH and HCl ionize completely:initial mol OH−=mol NaOH=(0.0050 L)(0.10 molL)=0.00050 mol OH−initial mol H3O+=mol HCl=(0.050 L)(0.10 molL)=0.0050 mol H3O+The acid is in excess, so all of the OH− present will neutralize an equivalent amount of H3O+, forming water. Thus we simply subtract the moles of hydroxide from the moles of hydronium in solution to find the resultant moles of H3O+ after this neutralization:final mol H3O+= initial mol H3O+−initial mol OH−final mol H3O+=0.0050 mol−0.00050 mol=0.0045 mol H3O+We now calculate the total volume of the solution by adding the volumes of acid and base initially combined: 0.050 L+0.0050 L=0.055 LTo get [H3O+], we divide the final moles of hydronium by the final solution volume:[H3O+]=final mol H3O+ total volume=0.0045 mol0.055 L≈0.08181molLFinally, to find pH:pH=−log[H3O+]=−log(0.08181)=1.09Since the hydronium concentration is only precise to two significant figures, the logarithm should be rounded to two decimal places.

The wavelength of lambda is 2.93 m. = (c)/(v) = (3 xx 10(8) ms-(-1), 102.5 xx 10(6)s-(-1), 2.93 m' 2.93 meters is the wave length. 27 Jun 2022.

In order to get a radio wave's wavelength, divide its frequency by the speed of light (c = 299 792 458 m). The following is the formula for determining a radio wave's wavelength: Wavelength is equal to c/f, where c is the speed in meters per second, and f is the frequency in Hertz.

A wave train's speed (v) in a medium is equal to its frequency (f), hence the formula for wavelength is v/f. Wavelength is typically represented by the Greek symbol lambda ().

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Taking into account the reaction stoichiometry, 2.14 grams of H₂O are formed when 20.0 grams of NaHCO₃ decomposes.

In first place, the balanced reaction is:

2 NaHCO₃ → H₂O + CO₂ + Na₂CO₃

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

By reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: if by reaction stoichiometry 168 grams of NaHCO₃ form 18 grams of H₂O, 20 grams of NaHCO₃ form how much mass of H₂O?

mass of H₂O= (20 grams of NaHCO₃× 18 grams of H₂O)÷168 grams of NaHCO₃

mass of H₂O= 2.14 grams

Finally, 2.14 grams of H₂O are formed.

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The mass of hydrogen needed to produce 51.0 grams of ammonia is  ≈ 9.07 grams.

To determine the mass of hydrogen required to produce 51.0 grams of ammonia (NH3) using the Haber process, we need to calculate the stoichiometric ratio between hydrogen and ammonia.

From the balanced chemical equation:

3 H₂(g) + N₂(g) → 2 NH₃(g)

We can see that for every 3 moles of hydrogen (H₂), we obtain 2 moles of ammonia (NH₃).

First, we need to convert the given mass of ammonia (51.0 grams) to moles. The molar mass of NH₃ is 17.03 g/mol.

Number of moles of NH₃ = Mass / Molar mass

                     = 51.0 g / 17.03 g/mol

                     ≈ 2.995 moles

Next, using the stoichiometric ratio, we can calculate the moles of hydrogen required.

Moles of H₂ = (Moles of NH₃ × Coefficient of H₂) / Coefficient of NH₃

           = (2.995 moles × 3) / 2

           ≈ 4.493 moles

Finally, we can convert the moles of hydrogen to mass using the molar mass of hydrogen (2.02 g/mol).

Mass of H₂ = Moles × Molar mass

          = 4.493 moles × 2.02 g/mol

          ≈ 9.07 grams

Therefore, approximately 9.07 grams of hydrogen is needed to produce 51.0 grams of ammonia in the Haber process.

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Answer:

pls answer this link for the answer :D

Explanation:

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Answer:

When carbon dioxide reacts with water carbonic acid is formed, from which hydrogen ions dissociate increasing the acidity of the systemCarbon dioxide emissions to the atmosphere can therefore increase the acidity of land, sea and air

Explanation:

Answer:

a. 5 protons and 5 neutrons

b. 11 protons and 13 neutrons

c. 27 protons and 32 neutrons

d. 82 protons and 126 neutrons

e. 92 protons and 143 neutrons

Explanation:

Using isotope notation:

ˣN

X = Amount of neutrons and protons

N is the atom. If N is nitrogen, the atomic number is 7, that means there are 7 protons.

X - Amount of protons = Neutrons

a. ¹⁰B. Atomic number = 5 = Number of protons

10 - 5 = 5 = Number of neutrons

5 protons and 5 neutrons

b. ²⁴N. Atomic number = 11 = Number of protons

24 - 11 = 13 = Number of neutrons

11 protons and 13 neutrons

c. ⁵⁹Co. Atomic number = 27 = Number of protons

59 - 27 = 32 = Number of neutrons

27 protons and 32 neutrons

d. ²⁰⁸Pb. Atomic number = 82 = Number of protons

208 - 82 = 126 = Number of neutrons

82 protons and 126 neutrons

e. ²³⁵U. Atomic number = 92 = Number of protons

235 - 92 = 143 = Number of neutrons

92 protons and 143 neutrons