The number of electron energy levels in a magnesium atom is
12345

Answer:

a chemical bond in which two pairs of electrons are shared by two atoms and a molecule. Examples of compounds with double bonds include oxygen gas, carbon dioxide, acetone, and ozone

a chemical bond in which two pairs of electrons are shared between two atoms.

Answer:

See Explanation

Explanation:

as potassium chloride(KCI) dissolves in water, the potassium and chloride  ions are formed and hydrated. Ion-dipole forces attract the positive(Hydrogen) end of the polar water molecules to the negative chloride ions at the surface of the solid, and they attract the negative(oxygen) ends to the positive potassium ions

P=nRT/V

P ≈ 1/V = decreasing volume

P ≈ T = increasing temperature

P ≈ n = adding one more mole of helium

The statement that proteins have an asymmetrical tertiary structure, while multi-subunit proteins can exhibit several types of symmetry is a true one.

Proteins are called complex macromolecules which consists of one or more polypeptide chains that fold into different three-dimensional structures. The polypeptide chains in a protein are asymmetric, but the overall multi subunits in the protein structure exhibits a wide variety range of symmetries. Because the classes of point-group symmetry involves a defined number of subunits to be arranged about one or more axes of symmetry. Thereby the symmetry reduces when more than one polypeptide chain is incorporated into a specific subunit of the protein thereby resulting in the formation of one more asymmetric unit in the strucure of protein.

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Answer:

1.85 × 10⁻⁶

Explanation:

0.0003 ÷ 162 = 1.851851852 × 10⁻⁶ ⇒ 1.85 × 10⁻⁶

Hope that helps.

The significant figure in the answer should be one here, since the number 0.0003 contains only one significant figure. Hence, the answer is 2 × 10⁻⁶.

Significant figures are digits in a quantity with certain values along with some uncertain digits. The counting of significant figures of a number should follow some rules.

The zeros after the decimal point which is not following a nonzero number are not significant. Therefore, there is only one significant figure in the number 0.0003.

For any arithmetic operation, the number of significant figures in the result should be equal to the one in operation that is with least significant figures.

Here.  162 have 3 significant figures. Therefore, the result should contain only one significant figure.

0.0003 /162 = 1.85  × 10⁻⁶.

Then the result with correct significant figures is rounded to 2 × 10⁻⁶.

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The boiling point of the solution is raised by 2.085 °C and the freezing point is lowered by 3.174 °C.

The boiling point elevation and freezing point depression of a solution containing 8.30 g of ethylene glycol (C2H6O2) in 99.2 mL of ethanol are to be calculated. Ethanol has a density of 0.789 g/cm³.

The freezing point depression (ΔTf) can be determined as follows:

ΔTf = kf × molality

Here, kf is the freezing point depression constant of the solvent and is equal to 1.86 °C/m for ethanol.

Molality can be calculated as follows: Molality = moles of solute/mass of solvent (kg)The mass of ethanol in the solution can be determined as follows:

Mass of ethanol = Volume of ethanol × Density= 99.2 mL × 0.789 g/mL= 78.251 g= 0.078251 kg

The number of moles of ethylene glycol in the solution can be calculated as follows:

Number of moles of ethylene glycol = Mass / Molar mass

= 8.30 g / 62.07 g/mol

= 0.1337 mol

Thus, molality can be calculated as follows:

Molality = 0.1337 mol / 0.078251 kg= 1.707 mol/kg

Therefore,

ΔTf = 1.86 °C/m × 1.707 mol/kg= 3.174 °C

The boiling point elevation (ΔTb) can be calculated as follows:

ΔTb = kb × molality

Here, kb is the boiling point elevation constant of the solvent and is equal to 1.22 °C/m for ethanol. Molality can be calculated as follows:

Molality = moles of solute/mass of solvent (kg)

The mass of ethanol in the solution can be determined as follows:

Mass of ethanol = Volume of ethanol × Density

= 99.2 mL × 0.789 g/mL

= 78.251 g

= 0.078251 kg

The number of moles of ethylene glycol in the solution can be calculated as follows:

Number of moles of ethylene glycol = Mass / Molar mass

= 8.30 g / 62.07 g/mol

= 0.1337 mol

Thus, molality can be calculated as follows:

Molality = 0.1337 mol / 0.078251 kg= 1.707 mol/kg

Therefore, ΔTb = 1.22 °C/m × 1.707 mol/kg= 2.085 °C

Therefore, the boiling point of the solution is raised by 2.085 °C and the freezing point is lowered by 3.174 °C.

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The mass of aluminum that can be produced in 2.40 h is 1390 kg aluminum production by Electrolysis.

The amount of aluminum produced can be calculated using Faraday's law, which states that the amount of substance produced is directly proportional to the amount of electric charge passed through the cell, and the molar mass of the substance.

The balanced chemical equation for the electrolysis of \(Al_2O_3\) is:

\(2 Al_2O_3(l)\) -> \(4 Al(l) + 3 O_2(g)\)

From the equation, we see that for every 4 moles of aluminum produced, 6 moles of electrons are needed.

The charge passed through the cell can be calculated using the formula:

charge = current × time

Where current is measured in amperes (A) and time is measured in hours (h). We need to convert 2.40 h to seconds:

\(2.40* 3600 = 8640 s\)

The charge passed through the cell is:

charge = 1.15 million A × 8640 s = \(9.936 * 10^9\) C

The number of moles of electrons passed through the cell can be calculated as:

moles of electrons = charge / Faraday's constant

Where Faraday's constant is 96,485 C/mol.

moles of electrons = \(\frac{9.936 * 10^9}{96,485} = 103,068\) mol

Therefore, the number of moles of aluminum produced is half of the number of moles of electrons, or:

moles of Al = 0.5 × (103,068 mol) = 51,534 mol

The mass of aluminum produced can be calculated using the molar mass of aluminum, which is 26.98 g/mol:

mass of Al = moles of Al × molar mass of Al

mass of Al = \(51,534 * 26.98 = 1.39 * 10^6\) g or 1390 kg

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Answer:

Noble gas, any of the seven chemical elements that make up Group 18 (VIIIa) of the periodic table. The elements are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and oganesson (Og). The noble gases are colourless, odourless, tasteless, nonflammable gases. They traditionally have been labeled Group 0 in the periodic table because for decades after their discovery it was believed that they could not bond to other atoms; that is, that their atoms could not combine with those of other elements to form chemical compounds. Their electronic structures and the finding that some of them do indeed form compounds has led to the more appropriate designation, Group 18.

interactive periodic table

Answer:

b.troposphere

Explanation:

pls mark me brainliest

Answer:

The atomic number is located at the upper left of the element.

Hope this helps!! :)

If an object contains more electrons than protons, it is said to be negatively charged. This is because electrons are negatively charged particles while protons are positively charged particles. The excess electrons in the object will give it an overall negative charge.

This negative charge can be observed in various ways. For example, if the object is brought close to a positively charged object, it will be attracted to it. This is because opposite charges attract each other. On the other hand, if the object is brought close to another negatively charged object, it will repel it. This is because like charges repel each other.

Negatively charged objects can also have an impact on their surroundings. For example, they can create static electricity, which can lead to shocks when two objects with different charges come into contact. They can also affect electronic equipment, as excess electrons can cause interference and damage.

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Answer:

when an atom loses electrons, it will then contain more protons. Thus, the charge of the atom become positive.

No, the volume of water in a beaker is not an extensive property.

Extensive properties are those that depend on the amount or size of the substance being measured. In other words, they are properties that change with the quantity of the substance. Examples of extensive properties include mass, volume, and total energy.

In the given scenario, the volume of water in the beaker is 50 milliliters. This volume remains the same regardless of the quantity of water present. Whether it's 50 milliliters or 500 milliliters, the volume measurement does not change. Therefore, the volume of water in the beaker is an example of an intensive property.

Intensive properties are independent of the amount or size of the substance. They are characteristics that remain constant regardless of the quantity of the substance. Examples of intensive properties include temperature, density, and color.

It's important to note that the distinction between extensive and intensive properties depends on the specific property being considered. While volume is typically an extensive property for a bulk substance, in the case of a fixed volume of water in a beaker, it becomes an intensive property.

In summary, the volume of water in a beaker is not an extensive property but rather an intensive property because it does not change with the quantity of the substance.

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A stationary metal sphere can have kinetic energy due to the movement of its molecules. The metal's molecules are in constant motion, which contributes to the overall kinetic energy of the sphere.

The statement "The metal's molecules are moving around" explains why a stationary metal sphere can have kinetic energy. Although the sphere as a whole may appear motionless, the individual molecules within the metal are in constant motion. This molecular motion contributes to the overall kinetic energy of the sphere.

In the case of a metal, the atoms that make up the metal store potential energy. This potential energy arises from the interactions between the atoms, such as the electrostatic forces within the metal lattice. However, the question specifically asks about kinetic energy, which is the energy associated with the motion of an object.

The other options provided are not directly related to the kinetic energy of a stationary metal sphere. The ability to roll the sphere or the concept of absolute heat of the substance are not relevant to explaining the kinetic energy of the metal sphere. While the metal atoms may vibrate in place, this vibration would contribute to the internal energy of the metal rather than the kinetic energy of the stationary sphere as a whole.

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The atomic radius becomes larger as move down the group or column in the periodic table because it increases the number of energy levels with each successive period.

As we move down the group, the number of period increases, which means the number of shells in an atom also increases. So, the extra electrons are added in the next shell with each successive period down the group, and the atomic size increases with an increase in atomic number down the group.

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A nitrogen atom in N2O3 has an oxidation number of +3.

The unknown nitrogen oxidation number can be given a variable (x) to ascertain its oxidation number. Since oxygen has an oxidation number of - 2 and there are three oxygen particles in N₂O₃, the complete negative charge from oxygen is (- 2) × 3 = - 6.

The total charge of a compound is equal to the sum of its oxidation numbers. Since the compound in question is neutral, the sum of the oxidation numbers must be zero in this instance.

2(N) + 3(O) = 0

2x + (-6) = 0

2x = 6

x = 3

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Answer:

It both benefits the bird by providing sustenance and the plant by possibly spreading seeds through fecal matter.

Explanation:

Answer:

it's C

Explanation:

the mitochondria makes energy for the cell so without it there's no energy for the cell

Answere:No sé esto jeje lo siento no soy tonta pero simplemente no sé esto

Explanation:

c. n3o5: tri nitrogen pentoxide is incorrect because the correct formula should be N2O5, representing two nitrogen atoms and five oxygen atoms in the compound.

The correct formula for trinitrogen pentoxide should be N2O5, not N3O5. Trinitrogen pentoxide consists of two nitrogen atoms (N2) and five oxygen atoms (O5). The prefix "tri-" indicates the presence of three nitrogen atoms. Therefore, the formula N2O5 correctly represents tri-nitrogen pentoxide.

Option c states N3O5 as the formula for tri-nitrogen pentoxide, which is incorrect because it suggests the presence of three nitrogen atoms and five oxygen atoms. The formula should have two nitrogen atoms and five oxygen atoms, as represented by N2O5.

The other formula/name pairs (a. MnCO3, b. MgSO4, d. BaCl2, and e. Fe2S3) are correct and match the correct names of the respective compounds (manganese(ii) carbonate, magnesium sulfate, barium chloride, and iron(ii) sulfide).

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The incorrect formula/name pair is Fe2S3: Iron(II) Sulphide. According to the formula Fe2S3, the correct name should be Iron(III) Sulphide.

The question is asking to identify the incorrect formula/name pair among the given options. The pairs are: (a) MnCO3: Manganese(II) Carbonate, (b) MgSO4: Magnesium Sulfate, (c) N3O5: Trinitrogen Pentoxide, (d) BaCl2: Barium Chloride, and (e) Fe2S3: Iron(II) Sulphide.

Using the rules of naming chemical compounds, the incorrect pair is (e) Fe2S3: Iron(II) Sulphide. The Roman numeral (II) in 'Iron(II)' indicates the oxidation number of Iron. According to the given formula, Fe2S3, there are 2 atoms of Iron and 3 atoms of Sulfur. Hence, the correct name should be Iron(III) Sulfide, not Iron(II) Sulfide. All the other pairs are correctly named.

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Answer:

Family is defined as a specific group of people that may be made up of partners, children, parents, aunts, uncles, cousins and grandparents. An example of a family is a set of parents living with their children. The definition of family is the group of people who share common ancestors.

Family is very important part of our everyday life. It helps us in improving our personality. It also helps us in shaping our life. It teaches us the value of love, affection, care, truthfulness and self-confidence and provides us tools and suggestions which are necessary to get success in life.  Family is a place where you can be yourself. It is a place where you are accepted for what you are. This is where you are completely tension free and everyone is there to help you. Family encourages you when you are surrounded by problems. It helps you survive through tough times and bring joy and happiness into life.

Kilauea volcano in Hawaii emits 200-300 tons of sulfur dioxide into the atmosphere each day. This is an example of

Kilauea volcano in Hawaii emits noxious compounds of sulfur dioxide and other harmful pollutants as a result of a reaction with atmospheric water vapors and oxygen.

This reaction results in acid rain and volcanic smog which pollutes the air.

Over the years, the volcano has become a potential threat to health as harmful oxides are accelerating respiratory problems and acid rain destroys crops, and also harms water supplies.

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There are 6 σ bonds and 3 π bonds in H₃C-CH₂-CH═CH-CH₂-C≡CH.

In the given chemical structure, σ (sigma) bonds are formed by the overlap of atomic orbitals in a head-to-head fashion. These bonds allow for the sharing of electrons between the atoms involved. Each single bond, whether between carbon and hydrogen or carbon and carbon, is a σ bond. Therefore, we count the number of single bonds to determine the number of σ bonds.

In this molecule, there are six single bonds: three between carbon and hydrogen  and three between carbon and carbon.Hence, there are 6 σ bonds in total.

In the given structure, there are three double bonds: one between carbon atoms (═), one between carbon and carbon (ch═ch), and one between carbon and carbon (c≡ch). Each double bond consists of one σ bond and one π bond.

Therefore, there are 6 σ bonds and 3 π bonds in the given chemical structure.

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The volume, in milliliters, of the krypton gas is 523ml.

The Ideal gas law is the equation of state of a hypothetical ideal gas. It is a good approximation to the behaviour of many gases under many conditions, although it has several limitations. The ideal gas equation can be written as

                                    PV = nRT

where,

P = Pressure

V = Volume

T = Temperature

n = number of moles

Given,

Mass = 10g

Pressure = 563 mm Hg

Temperature = 298 K

moles of Kr =mass / atomic mass

= 10 / 84

= 0.119 moles

PV = nRT

563 × V = 0.119 × 8.314 × 298

V = 0.523L = 523ml

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The bubbles in the bread is caused by the evolution of carbon dioxide by the action of yeast. If there are no bubbles formed inside the bread which means, the yeast did not produce the carbon dioxide needed for the bread to rise.

Fermentation is the process of conversion of sugar molecule into other substance b the action of microbes such as yeast. In cellular respiration the glucose molecule is converting to carbon dioxide and water. Where as, in fermentation, the glucose is converting to carbon dioxide and ethanol.

The balanced chemical equation of the breaking of glucose into carbon dioxide and water is written as follows:

\(\rm C_{6}H_{12}O_{6} \rightarrow 2CO_{2} + 2C_{2}H_{5}OH.\)

According to this reaction, one mole of glucose molecule gives 2 moles of carbon dioxide and 2 moles of ethanol. Hence, if the bread do not rise the bubbles, the yeast does not producing CO₂.

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Answer:

30

Explanation:

I’m pretty sure it is

Answer:

A tall and narrow A tall and narrow

Explanation:

Answer:

A. Tall and Narrow

Explanation:

The frequency of a wave is inversely proportional to its wavelength. That means that waves with a high frequency have a short wavelength, while waves with a low frequency have a longer wavelength. But high amplitude waves tend to be short spent and tall narrow linings.

Answer:

1) Carrying capacity is the maximum number of individuals of a species that an environment can support.

2) Population - all the inhabitants of a particular town, area, or country.

3) An increase in population will inevitably create pressures leading to more deforestation, decreased biodiversity, and spikes in pollution and emissions, which will exacerbate climate change.

4) The three leading causes of population growth are births, deaths, and migration. Births and deaths are seen as natural causes of population change.

Answer:

there are 106 particles