Which is greater the area of a red plate diner has a radius of 6 cm or the area of two yellow plate with a radius of 3 cm each

The orbitals are accountable to the law of octaves are: 1s 2s 2p 2p 3s 3p 3d  4s 4p 4d 5s 5p 4f 5d 6s 6p 5f 6d 7s .

The law of octaves introduced by the English chemist named J.A.R Newlands. According to it if we arranged the chemical elements in the periodic table according to their atomic mass then those that have the similar physical and the chemical properties will occur after the each interval of the seven elements.

The last element that is known was the thorium with the atomic mass of 232. Newlands' law of octave was firstly applicable only up to the calcium with atomic mass of 40. Now there are more ninety elements known up to the thorium.

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A magnetic force is what moves the compass needle when it is in close proximity to a particular kind of metal. This is so because the magnetic fields of the metal item and the compass needle interact to create a force.

Permanent magnets, electric currents, and various types of metals may all be surrounded by magnetic fields, which are created by moving charges like electrons. The compass needle will move or align itself with the magnetic field lines when a magnetic field is applied to a magnetic substance, such as that material.If the compass is placed next to a metal item, the metal must likewise have a magnetic field or be able to create one when exposed to one. The compass needle moves as a result of the force created by the interaction of the magnetic fields, revealing the existence and direction of the magnetic field generated by the metal item.

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Answer:

Huh.

Explanation:

Condensation or evaporation

Substance C is a solid solute because the solubility of a solid increases with increasing temperature. Therefore, option B is correct.

Solubility refers to the ability of a solute to dissolve in a solvent and form a homogeneous mixture called a solution. It is a measure of how much of a solute can dissolve in a given amount of solvent under specific conditions, such as temperature and pressure.

Solubility is typically expressed as the maximum amount of solute that can dissolve in a specified amount of solvent. The solubility of a substance is influenced by various factors, including the nature of the solute and solvent, temperature, pressure, and the presence of other substances.

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Answer: it's substance A hope it helps.!

The gas will have a final pressure of 26.8 kPa.

The pressure of a gas is inversely related to its volume at constant temperature, as well as its number of moles, according to Boyle's law.Using the ideal gas law, the final pressure can be calculated as follows:

\(P_1V_1=P_2V_2\)

\(P_1\)= the gas's initial pressure is 209 kPa.

\(P_2\) =gas's final pressure =?

\(V_1\) = 10.0 L, which is the gas's initial volume.

\(V_2\) =78.0 L, which is the gas's final volume.

Now that all the needed variables have been entered, we can apply this formula to determine the final gas pressure.

209 kPa*10.0L= \(P_2\) *78.0L

\(P_2 =26.8 kPa\)

Therefore, the final pressure of the gas is 26.8kPa.

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The molar heat of solution of sodium hydroxide is 446,192 J/mol.

To calculate the molar heat of solution of sodium hydroxide, we can use the equation:

q = mCΔT

where q is the heat absorbed by the solution, m is the mass of the solute (in grams), C is the specific

heat capacity of the solution (in J/g·°C), and ΔT is the temperature change (in °C).

First, we need to calculate the heat absorbed by the solution:

q = mCΔT
q = 1000 g (specific heat of water = 4.18 J/g·°C) (26.6 °C)
q = 111,548 J

Next, we need to calculate the number of moles of sodium hydroxide:

n = m/MW
n = 10 g / 40.00 g/mol
n = 0.25 mol

Finally, we can calculate the molar heat of solution:

ΔHsoln = q/n
ΔHsoln = 111,548 J / 0.25 mol
ΔHsoln = 446,192 J/mol

Molar heat of solution = 446,192 J/mol

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The intermolecular forces that exist among the molecules of NH3 gas are both dipole-dipole forces and London dispersion forces. The correct option is c).

NH3, or ammonia, is a polar molecule due to the electronegativity difference between nitrogen and hydrogen atoms. The nitrogen atom pulls the shared electrons towards itself, creating a partial negative charge, while the hydrogen atoms have a partial positive charge.

This polarity allows NH3 molecules to experience dipole-dipole interactions, where the positive end of one molecule is attracted to the negative end of another molecule.

Additionally, NH3 molecules also experience London dispersion forces, which are temporary attractive forces that arise due to temporary fluctuations in electron distribution within the molecules.

Even though NH3 is polar, it can still experience London dispersion forces since all molecules have electrons that are constantly moving and creating temporary dipoles.

Therefore, the correct option is c).

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Complete question :

The intermolecular forces that exist among the molecules of nh3 gas are

a. dipole-dipole forces only

b. london dispersion forces only

c. both dipole-dipole and london dispersion forces only

d. neither  dipole-dipole or london dispersion forces only

Answer:

[(x-37.5)/x]*100%

62.5%  (assuming the original sample weighs 100.0g)

Explanation:

Let's say that the original sample is x

Mass of I-125 which has decayed: x-37.5

Percentage of decayed mass: [(x-37.5)/x]*100%

Please recheck, for this may not be the correct answer

Answer: The statement, chemicals that you begin with found on the left side of the equation, describes reactant and where they are in a chemical equation.

Explanation:

An equation that includes symbolic formulas and represents chemical reaction between the substances initially present forming new substances is called a chemical equation.

For example, \(N_{2} + 3H_{2} \rightarrow 2NH_{3}\)

Here, substances \(N_{2}\) and \(H_{2}\) are the reactants. Reactants in a chemical equation are always present on the left side as these are the chemicals we begin with.

Also here, \(NH_{3}\) is the product. Product(s) in a chemical equation are always present on the right side as these are the chemicals we end with.

Thus, we can conclude that the statement, chemicals that you begin with found on the left side of the equation, describes reactant and where they are in a chemical equation.

175 ml of a 1.6 m solution of KCl is diluted to a new volume of 1.0 L. The new concentration of the solution is 0.28 m KCl.

Hence, Option (B) is correct answer.

Concentration is defined as the measure of how much substance there is mixed with another substance.

To find the concentration use the dilution formula

C₁V₁ = C₂V₂

where,

C₁ = Concentration of starting solution

C₂ = Concentration of final solution

V₁ = Volume of the starting solution

V₂ = Volume of the final solution

Now put the values in above formula we get

C₁V₁ = C₂V₂

1.6 × 0.175 = C₂ × 1.0

0.28 = C₂ × 1.0

C₂ = 0.28

Thus from the above conclusion we can say that 175 ml of a 1.6 m solution of KCl is diluted to a new volume of 1.0 L. The new concentration of the solution is 0.28 m KCl.

Hence, Option (B) is correct answer.

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Answer:

More particles per unit volume

Explanation:

Concentration means the amount of solute in a solution. Now, the amount of solute also means the number of particles of solute present in a solution.

Hence, when we use the term "high concentration", we imply that the amount of solute present or the number of particles present in a solution is high.

Thus, at high concentration, there are more solute particles than solvent particles in a solution.

Due to the creation of complicated potassium aluminate, this reaction is complex.

The FDA classifies potassium alum as a chemical that is generally acknowledged as safe (GRAS). It is an inorganic salt with the formula AlK(SO4)2, sometimes known as potassium aluminum sulfate.

Nowadays, potassium sulfate is added to a concentrated solution of aluminium sulfate to create potassium alum in an industrial setting. Typically, sulfuric acid is used to process minerals like cryolite, bauxite, and alum schist to produce aluminum sulfate.

Breif:

2 Al ( s ) Aluminium + 2 KOH ( aq ) Potassium hydroxide + 6 H 2 O ( l ) Water → 2 K [ Al ( OH ) 4 ] ( aq ) Tetrahydroxoaluminate ( III ) or Potassium aluminate + 3 H 2 ( g ) Hydrogen.

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Answer:

(CH3COO)2 + redP + Cl2 → ClCH2COOH + HCl

Explanation:

This is an example of halogenation of carboxylic acids at alpha carbon atom. In this reaction, red phosphorus and chlorine are treated with carboxylic acids having alpha hydrogen atom followed by hydrolysis to form alpha chloro carboxylic acid.

The gas-phase decomposition of SO2Cl2 is a first-order reaction, and the rate of the reaction is given by the equation: rate = k[SO2Cl2]

The half-life of a first-order reaction is given by the equation: T1/2 = 0.693/k (a) At 600 K, the half-life for the process is 2.3 x 105 s. To find the rate constant at this temperature, we can use the half-life equation to solve for k: T1/2 = 0.693/k ;2.3 x 105 s = 0.693/k ;k = 0.693 / 2.3 x 105 s = 3 x 10^-5 s-1 , (b) At 320 degree celcius  , the rate constant is 2.2 x 10^-5 s^-1. To find the half-life at this temperature, we can use the half-life equation and substitute in the given rate constant: T1/2 = 0.693/k;T1/2 = 0.693 / 2.2 x 10^-5 s-1 ;T1/2 = 3.15 x 10^4 s Therefore, the half-life of the reaction at 320 degree celcius is 3.15 x 10^4 seconds.

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The biosynthesis of cholesterol is a complex process that involves multiple steps and intermediates. The pathway starts with acetyl CoA, which is converted to HMG-CoA by the enzyme HMG-CoA reductase. Mevalonate is then formed by the action of several enzymes. The next intermediates are isopentenyl pyrophosphate, geranyl pyrophosphate, and farnesyl pyrophosphate, which are formed by the condensation of several molecules of isopentenyl pyrophosphate.

Finally, lanosterol is formed from squalene through several intermediate steps, which ultimately lead to the production of cholesterol. This process is tightly regulated, and any disruption in the biosynthesis of cholesterol can lead to various diseases. In the biosynthesis of cholesterol, the correct order of the first three intermediates is: acetyl CoA → HMG-CoA → mevalonate.
The next three intermediates, in the correct order, are: isopentenyl pyrophosphate → geranyl pyrophosphate → farnesyl pyrophosphate.
The remaining intermediates to form cholesterol are: squalene → squalene epoxide → lanosterol → cholesterol.

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The amount of energy required to heat the 45.00 g sample by 50.00 °C is 78,780 J.

For calculating the amount of energy required to heat a sample, we can use the formula:

Energy = mass × heat capacity × temperature change

Mass = 45.00 g

Heat capacity = 3.504 J/(g·°C)

Temperature change = 50.00 °C

Plugging in these values into the formula:

Energy = 45.00 g × 3.504 J/(g·°C) × 50.00 °C

Calculating the energy:

Energy = 78,780 J

Therefore, the amount of energy required to heat the 45.00 g sample by 50.00 °C is 78,780 J.

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The amount of energy required to heat the 45.00 g sample by 50.00 °C is 78,780 J. For calculating the amount of energy required to heat a sample, we can use the formula:

Energy = mass × heat capacity × temperature change

Mass = 45.00 g

Heat capacity = 3.504 J/(g·°C)

Temperature change = 50.00 °C

Plugging in these values into the formula:

Energy = 45.00 g × 3.504 J/(g·°C) × 50.00 °C

Calculating the energy:

Energy = 78,780 J

Therefore, the amount of energy required to heat the 45.00 g sample by 50.00 °C is 78,780 J.

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Approximately 1.28 x 10^18 photons with a wavelength of 254 nm would produce the reddening on 1.0 cm² of skin.

To determine the total number of photons with a wavelength of 254 nm that produce reddening on 1.0 cm² of skin, we need to follow these steps:

Step 1:

Calculate the energy of a single photon using the formula: E = hc/λ, where E represents the energy of a photon, h is Planck's constant (6.626 x 10^-34 J·s), c is the speed of light (3.0 x 10^8 m/s), and λ is the wavelength in meters.

Let's convert the wavelength from nanometers (nm) to meters (m):

254 nm = 254 x 10^-9 m = 2.54 x 10^-7 m

Now we can calculate the energy of a single photon:

E = (6.626 x 10^-34 J·s)(3.0 x 10^8 m/s) / (2.54 x 10^-7 m) = 7.84 x 10^-19 J

Step 2:

Determine the energy required for reddening on 1.0 cm² of skin. This information is not provided in the question, so we'll need to make an assumption or refer to relevant literature. Let's assume that 1.0 J of energy is required for reddening on 1.0 cm² of skin.

Step 3:

Calculate the total number of photons needed by dividing the total energy required by the energy of a single photon:

Total number of photons = Total energy required / Energy of a single photon

Total number of photons = 1.0 J / 7.84 x 10^-19 J ≈ 1.28 x 10^18 photons

Therefore, approximately 1.28 x 10^18 photons with a wavelength of 254 nm would produce the reddening on 1.0 cm² of skin.

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Answer:

A. Reduced precipitation is the cause of drought.

Explanation:

Reduced precipitation begins to insufficient water availability because water catch basins or tanks tend to dry out. When it drains out, people tend to start working and drying out the backup water sources and stored ones. Until such time, that the reservoirs of water will completely be dried out. And there will be no more water for them to use and there will be a drought.

hope this helps

Answer:

Option A

Explanation:

Answer:

plate drifting

Explanation:

Plate tectonics

Plate tectonics is the theory that Earth's land masses are in constant motion. The realization that Earth's land masses move was first proposed by Alfred Wegener, which he called continental drift.

Answer:

Plate drifting

Explanation:

Answer:

C

Explanation:

it demonstrated that scientific understanding was always changing

The type of mixture whose components are evenly distributed throughout is a homogeneous mixture.

A homogeneous mixture is a mixture in which the components are uniformly distributed throughout. The mixture appears to be the same throughout, and it has the same physical and chemical properties throughout. The composition of the components of a homogeneous mixture is uniform. An example of a homogeneous mixture is a solution of sugar and water. Sugar dissolves in water to form a homogeneous mixture. Another example is salt and water. Salt dissolves in water to form a homogeneous mixture.

However, These are the kinds of combinations where the ingredients are evenly dispersed throughout. In other words, "they are consistent throughout. In a homogenous mixture, we can only see one phase of the substance and components are evenly distributed throughout .

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Answer:

Kinetic energy is highest at point B and Lowest at point A

Explanation:

The kinetic energy is directly proportional to the square of velocity. Therefore, the kinetic energy will be maximum at the point where the velocity is maximum. An it will be lowest at the position where the speed is the lowest. The speed is maximum at point B, because its the mean position. Hence, K.E will be max at B. Also speed is lowest at the highest point so, Kinetic Energy will be lowest at point A.

Another method can be used as follows:

Since, there are two energies present here, namely kinetic energy and potential energy that are interchanging with each other. From law of conservation of energy the sum of kinetic energy and potential energy must be equal at each point. Potential energy is directly proportional to height of object. So, the potential energy will be maximum at point A due to maximum height and consequently Kinetic energy will be minimum at point A. Similarly, the potential energy will be minimum at point B due to minimum height and consequently Kinetic energy will be maximum at point B. Therefore,

Kinetic energy is highest at point B and Lowest at point A

Answer:

Potential energy

Explanation:

Hanging objects have (gravitational) potential energy

Answer:

Explanation:

Every cell in the monkey's body (and ours) is constantly converting the stored solar energy in glucose into work and heat. The work is used to carry on cell processes like growing, reproducing, moving molecules around, and getting rid of waste. The heat is a byproduct of the fuel "burning" process.

Answer:

the second one that is it

Explanation:

bc i am o smaart like tht

The correct answer is B) 1.0 × 10^-2 M.

To determine the concentration of fluoride ions (F⁻) when BaF2 starts to precipitate, we can use the solubility product constant (Ksp) and the given concentration of Ba²⁺. The balanced equation for the reaction is:

Ba²⁺(aq) + 2F⁻(aq) ⇌ BaF2(s)

Ksp = [Ba²⁺][F⁻]^2 = 1.7 × 10^-6

The initial concentration of Ba²⁺ is 0.0158 M. Let x be the concentration of F⁻ when BaF2 starts to precipitate. At this point, the ion product (Q) is equal to the Ksp:

Q = [Ba²⁺][F⁻]^2 = Ksp

0.0158(x)^2 = 1.7 × 10^-6

Solving for x, we get:

x ≈ √(1.7 × 10^-6 / 0.0158) ≈ 1.038 × 10^-2 M

Therefore, the concentration of fluoride ions (F⁻) when BaF2 starts to precipitate is approximately 1.0 × 10^-2 M.

The concept used to determine the concentration of F⁻ is the equilibrium constant expression (Ksp) for the precipitation reaction of BaF2 in water. The Ksp value represents the product of the concentrations of the ions involved in the reaction, each raised to the power of their stoichiometric coefficients in the balanced equation. By setting the ion product (Q) equal to the Ksp, we can solve for the concentration of one of the ions in the equilibrium, in this case F⁻.

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Answer:

bbecause it make the answer

Answer:

Explanation:

To obtain pure crystals of iron sulfate from a mixture of copper carbonate and iron sulfate, you can use the process of filtration and crystallization. Here are the steps to follow:

Dissolve the mixture of copper carbonate and iron sulfate in water to form a solution.

Add dilute sulfuric acid to the solution, which will react with copper carbonate to form copper sulfate, carbon dioxide, and water. The iron sulfate will remain in the solution.

CuCO3 + H2SO4 -> CuSO4 + CO2 + H2O

Filter the solution to separate the solid copper sulfate from the iron sulfate solution.

Heat the iron sulfate solution to evaporate the water, leaving behind a concentrated solution of iron sulfate.

Allow the concentrated solution to cool slowly to room temperature to allow crystals of pure iron sulfate to form.

Filter the crystalized iron sulfate to separate it from any remaining solution.

Wash the crystals with distilled water to remove any impurities and allow them to dry.

By following these steps, you can obtain pure crystals of iron sulfate from a mixture of copper carbonate and iron sulfate.

The balanced reaction that corresponds to the data in the graph is: A + B -> C.

A) To calculate the average reaction rate for A over the time period 0-250 s, we need to find the slope of the line connecting the concentrations at those two time points. The concentration of A at 0 s is 0.6 M and at 250 s it is 0.3 M. Therefore, the change in concentration is -0.3 M. Dividing by the time interval of 250 s gives us an average reaction rate of -0.0012 M/s for A.

B) To calculate the average reaction rate for B over the time period 0-250 s, we need to find the slope of the line connecting the concentrations at those two time points. The concentration of B at 0 s is 0.2 M and at 250 s it is 0.1 M. Therefore, the change in concentration is -0.1 M. Dividing by the time interval of 250 s gives us an average reaction rate of -0.0004 M/s for B.

C) To calculate the average reaction rate for C over the time period 0-250 s, we need to find the slope of the line connecting the concentrations at those two time points. The concentration of C at 0 s is 0.4 M and at 250 s it is 0.5 M. Therefore, the change in concentration is 0.1 M. Dividing by the time interval of 250 s gives us an average reaction rate of 0.0004 M/s for C.

D) The balanced reaction that corresponds to the data in the graph is: A + B -> C.

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