Prove that: F = Gm₁m₂ /d^2​

The electronic configuration of zinc is expressed as [tex]1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^2[/tex]. Hence, option D is correct.

Electronic configuration, also called electronic structure, is the arrangement of electrons in energy levels around an atomic nucleus.

The atomic number of zinc is 30 therefore The electronic configuration of zinc is expressed as [tex]1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^2[/tex].

In simpler form expressed as [Ar] [tex]3d^10 4s^2[/tex]. The electronic configuration shows the distribution of the electrons of an atom or a molecule.

Hence, option D is correct.

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Answer:

Chlorowanie wody jest procesem względnie tanim – koszt zbudowania samej instalacji do dezynfekcji, jak również koszt operacyjny wytworzenia 1 metra sześciennego uzdatnionej chlorem wody jest niższy od dezynfekcji wody za pomocą ozonu. Źródłem chloru w procesie dezynfekcji jest zazwyczaj podchloryn sodu, rzadziej dwutlenek chloru.

Explanation:

Hydroelectricity is the technology whose growth has surpassed the city's ability to provide sufficient water to its people.

Technology is the process of fusing science and the application of skills in scientific industries.

The population can use the waves even the tides of the ocean's water to create electricity which is reliable.

Of course in the beginning it will be expensive but the result will be effective and useful.

The area having a dry climate could be because of the winds that blow precipitating clouds away but they can have a stable climate by planting more trees where rain can be processed within the geographical location.

Finally, the problem of water supply can be fixed by installing water pipes to transport water to the community but in the process, water can be filtered or cleaned to prevent some diseases and social issues/calamities.

Hence, hydroelectricity is the technology whose growth has surpassed the city's ability to provide sufficient water to its people.

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Answer:

D

Explanation:

There are 2 oxygens on the reactants side (OH)2 but 4 on the products side (2H2O). You cannot get 2 oxygens out of nowhere, so it is not balanced.

Practical work refers to the art of conducting experiments in order to answer certain research questions.

In science, practical work refers to the art of conducting experiments in order to answer certain research questions. This could occur in a laboratory under controlled conditions or in the field.

In the physical sciences, most of the practical work is conducted in the laboratory under controlled conditions. However, some experiments in the biological sciences and most experiments in the social sciences are conducted outside the laboratory.

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Answer:

The molar volume of a gas expresses the volume occupied by 1 mole of that respective gas under certain temperature and pressure conditions.

scientists use molar volume to measure gas because it it tells us about volume occupied by gas.

Molar volume

Answer:

The Police Officer

Explanation:

The Police Officer said : her key the best key on world

The number of moles of gas in the container would be 4.62 moles

According to the ideal gas law:

  PV = nRT, where P = pressure, V, volume, n = mole number, and R = constant = 8.31

In this case, V = 58.953 L, P 467.81 kPa, and T = 719.11 K

Making n the subject:

   n = PV/RT = 58.953 x 467.81/8.31 x 719.11 = 4.62 moles

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(a) The speed of light in the unknown substance is determined 1.82 x 10⁸ m/s.

(b) The light will bend away from the normal since speed of light in air is not equal to speed of light in the substance.

The speed of light passing from air into the substance is calculated as follows;

refractive index = speed of light in air / speed of light in the substance

speed of light in the substance = speed of light in air/refractive index

speed of light in the substance = (3 x 10⁸) / (1.65)

speed of light in the substance = 1.82 x 10⁸ m/s

Thus, the light will bend away from the normal since speed of light in air is not equal to speed of light in the substance.

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The power delivered by the student's biceps will be 51.45W.

This is defined as the amount of energy converted per unit and the SI unit is Watts.

Power = Energy/time

Force = ma = 42 kg × 9.8m/s² = 411.6N.

Energy = Force × distance

           = 411.6N × 0.25m = 102.9J

Power = 102.9J/2s = 51.45W

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Familiar substances that sublime readily include iodine , dry ice , menthol, and camphor. Sublimation is occasionally used in the laboratory as a method for purification of solids, for example, with caffeine.

15.75 moles of oxygen is required for 4.5 mole of ethane.

The reaction in which a fuel  gets oxidized by an oxidizing agent is called a Combustion Reaction , releasing a large amount of energy is called Combustion Reaction.

It is given in the question that

4.50 mole of ethane undergoes Combustion

2C₂H₆   +  7O₂   ->  4CO₂  +6H₂O

Mole fraction of ethane to oxygen is 2:7

Moles of ethane = 4.5

4.5 /x = 2/7

4.5 * 7 / 2 = x

x = 15.75 moles.

Therefore 15.75 moles of oxygen is required for 4.5 mole of ethane.

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The criteria for designation as a biodiversity hotspot include species richness, endemism, and risk of extinction.

A biodiversity hotspot is a region having high levels of biodiversity in its communities and ecosystems.

A biodiversity hotspot must have a high number of endemic vascular plants (at least 1500 species).

In conclusion, the criteria for designation as a biodiversity hotspot include species richness, endemism, and risk of extinction.

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Answer:

During the completion of mitosis (telophase), two new nuclei form around the separated sets of daughter chromosomes (see Figure 8.29).

Explanation:

Energy transformations are the processes by which one form of energy is converted to another form.

Energy transformations refers to the various ways in which different forms of energy are interconverted.

The given energy transformations are as follows:

Therefore, energy transformations are the processes by which one form of energy is converted to another form.

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Answer:

Coating a material with metal

(SInce the glasses will be coated with gold.)

Answer:

The highest biogenic silica accumulation rates in this area are observed in the South Atlantic, with values as large as 53 cm. kyr−1 during the last 18,000 yr. Further, extensive biogenic silica accumulation has been recorded in the deep-sea sediments of the Bering Sea, Sea of Okhotsk, and Subarctic North Pacific.

Explanation:

The valence electron of the light metals are all in the range of 1 to 3.

Valence Electron is the number of electrons in the outer shell of an atom which participate in bond formation.

Number of Valence Electron in Boron is 3 and other light metals lighter than Boron have 1 , 2 of Lithium and Beryllium respectively,

The valence electron of the light metals are all in the range of 1 to 3.

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Answer: 10.865

Explanation:

The molarity of the solution is [tex]\frac{0.0003}{0.410}=0.0007317073 \text{ M}[/tex].

So, the pOH is [tex]-\log(0.0007317073)=3.135[/tex]

Since pH + pOH = 14, the pH is 14-3.135, which is about 10.865

In order to dissolve a chemical sample in a recrystallization solvent, add the room-temperature solvent just until it covers the sample in an Erlenmeyer flask on a hot plate.

Recrystallization involves dissolving the material to be purified (the solute) in an appropriate hot solvent.

Recrystallization, also known as fractional crystallization, is a procedure for purifying an impure compound in a solvent.

The method of purification is based on the principle that the solubility of most solids increases with increased temperature. Small crystals may trap impurities.

Thus, in order to dissolve a chemical sample in a recrystallization solvent, add the room-temperature solvent just until it covers the sample in an Erlenmeyer flask on a hot plate. Turn on the heat, starting at a low setting and increasing gradually.

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Answer:

Less

Explanation:

The hydronium from the HCl is used to neutralize the bicarbonate in the baking soda. The hydronium is the acid and the bicarbonate ion is the base while the sodium and chloride ions are pH-neutral. Since theres a 1:1 mole ratio of hydronium to HCl and bicarbonate to sodium bicarbonate, it would require less HCl to neutralize a less concentration baking soda solution.

[tex]2 Fe (s) + 3 H _2SO _4 (aq)[/tex] → [tex]Fe _2(SO _4) _3 (s) + 3 H _2 (g)[/tex] equation has the same coefficients in the same order as [tex]3 O_2 + C_2H_6O[/tex] → [tex]2 CO_2 + 3 H_2O[/tex]

The numbers placed in front of formulas to balance equations are called coefficients.

For the given equation [tex]3 O_2 + C_2H_6O[/tex] → [tex]2 CO_2 + 3 H_2O[/tex] sum of the coefficient of the reactant side is 5 and sum of the coefficient is 4.

So, according to the question [tex]2 Fe (s) + 3 H _2SO _4 (aq)[/tex] → [tex]Fe _2(SO _4) _3 (s) + 3 H _2 (g)[/tex] equation has the same coefficients in the same order as [tex]3 O_2 + C_2H_6O[/tex] → [tex]2 CO_2 + 3 H_2O[/tex]

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Answer:

It’s c

Explanation:

edge 2022

Answer:

l think gasoline and electric

The concentration of a solution of 192 grams dissolved to make 2150 mL of solution is 0.93M. Details about concentration can be found below.

The concentration of a solution can be calculated by dividing the number of moles of the substance by its volume.

no of moles of NH42CO3 = 192g ÷ 96g/mol = 2 mol

Concentration of solution = 2 moles ÷ 2.15L

Concentration of solution = 0.93M

Therefore, the concentration of a solution of 192 grams dissolved to make 2150 mL of solution is 0.93M.

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Moles of Mercury Nitrate

Mass

Answer:

1,840g

Explanation:

I just took the test and got it right :)