the ease with which the charge distribution in a molecule can be distorted by an external electrical field is called the . the ease with which the charge distribution in a molecule can be distorted by an external electrical field is called the . electronegativity hydrogen bonding volatility viscosity polarizability

If 170 milligrams of a radioactive substance decays to 85 g after 16 hours. Then, after 21 hours, approximately 75.2 mg of the radioactive substance will remain.

The decay of the radioactive substance follows an exponential decay equation of the form:

\(N(t) = N_{o} \times e^{-kt}\)

Where:

N(t) is the amount of substance remaining at time t

N₀ is the initial amount of substance

k is the decay constant

t is the time elapsed

Given to us is N₀ = 170 mg and N(16) = 85 mg. We can use this information to find the decay constant, k.

\(85 = 170 \times e^{-k \times 16}\)

Dividing both sides by 170:

\(0.5 = e^{-k \times 16}\)

To solve for k, we can take the natural logarithm (ln) of both sides:

ln(0.5) = -k × 16

from this, the value of k comes out to be:

k = 0.0431

Now we can use the decay equation to find the amount of substance remaining after 21 hours, N(21):

\(N(21) = 170 \times e^{-0.0431 \times 21}\)

Calculating this expression:

N(21) = 75.2

Therefore, after 21 hours, approximately 75.2 mg of the radioactive substance will remain.

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Answer:

The combustion will release -3,321 KJ/mol of energy

Explanation:

What we need to do here is to first calculate the number of moles of methane burnt.

Mathematically, the number of moles of methane burnt = mass of methane/molar mass of methane

Molar mass of methane = 16g /mol

Thus the

number of moles will be ;

59.7/16 = 3.73 moles

Now, 1 mole of methane produces -890 KJ/mol if energy

Then the energy produced by by 3.73 moles of methane would be 3.73 * 890 = -3,320.8125

which is approximately -3,321 KJ/mol

Kindly note that the amount of heat is negative because it is an exothermic reaction

Answer:

Radio wave

Explanation:

Radio waves are a type of electromagnetic wave radiation with wavelengths in the electromagnetic spectrum longer than infrared light

A seismic wave is an elastic wave generated by an impulse such as an earthquake or an explosion.

Sound and water waves are mechanical waves; meaning, they require a medium to travel through.

The cube is among the five Platonic solids. 0.56g/cm³ is the density if a 2.5cm cube of bone weighs 8.75g.

A cube is indeed a three-dimensional physical block having six square faces, facets, or sides, three of which meet at each vertex. It is a hexagon when viewed from a corner, and its net is commonly portrayed as a cross.

The cube is among the five Platonic solids and the only regular hexahedron. It has six faces, twelve edges, and eight vertices. In addition, the cube is a square parallelepiped, a equilateral cuboid, a right rhombohedron, and a 3-zonohedron.

density= mass/ volume

volume of cube =2.5×2.5×2.5=15.62cm³

density=  8.75/ 15.62=0.56g/cm³

Therefore, 0.56g/cm³  is the density if a 2.5cm cube of bone weighs 8.75g.

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radio waves, microwaves, infrared, light, ultraviolet, X-rays, and gamma rays. Your mind interprets the energies of light as different colors, from red to violet.

The correct options are:

The blood type with the most H antigen is Group O.

The blood type with the least H antigen is Group A.

The blood type with the most H antigen is Type O, while the blood type with the least H antigen is Type A. The presence or absence of the H antigen is determined by the ABO blood group system.

The H antigen is a precursor to the A and B antigens. Type O blood does not have A or B antigens, but it has a high level of H antigen. This means that Type O blood has the most H antigen among the given options.

On the other hand, Type A blood has A antigens and a lower level of H antigen compared to Type O. Therefore, among the given options, Type A blood has the least H antigen.

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Answer:

199

Explanation:

Au has atomic number of 79

so mass number = 79 + 120 = 199

Answer:

52/13

Explanation:

13X=30+22

x=52/13

Answer

False

Explanation:

Answer:

12.306

Explanation:

12.3+0.005675=12.305675 just put answer as 12.306

Answer:

12.3

Explanation:

I just did it and got it right

The compound is most likely the unknown is containing hydroxy group like propanol.

The hydroxy group contain OH group . The compound of of alcohol contain OH group. alcohol Contain hydroxy group at end of the chain . In OH group the oxygen atom form hydrogen bond  in water which make it soluble in water. Water is a universal solvent. solubility also depend on the length of the hydrocarbon chain. water is a polar compound. A hydrogen bond is a electrostatic force of attraction  between hydrogen atom and to the electronegative atoms such as O , F , N.  The hydrogen bond highly affect the solubility. due to the hydrogen bonding molecule becomes more polar and higher in solubility.

Thus, The compound is most likely the unknown is containing hydroxy group like propanol.

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Explanation:

Because chemistry deals with the structure of matter (such as the structure of the atom, it is related to physics. ... Because geology involves study of the matter the Earth and other bodies in the solar system are made of, geology involves chemistry. Geochemistry is the study of Earth materials, and how they change.

The frequency of a red laser that has a wavelength of 676 nm would be 4.43 x \(10^{14\) hertz.

The frequency and wavelength of a wave are related by the following equation:

λf = c

Where λ is the wavelength of the wave in meters, f is the frequency in Hertz, and c is the speed of light in a vacuum.

in this case, λ = 676 nm = 6.76 x \(10^{-7\) m

c = 299,792,458 m/s

Making f the subject of the formula:

f = c/λ

  = 299,792,458/6.76 x \(10^{-7\)

  = 4.43 x \(10^{14\) hertz

In other words, the frequency of a red laser that has a wavelength of 676 nm would be 4.43 x \(10^{14\) hertz.

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Answer:

320 grams of sulfur trioxide are required to produce 4.00 mol of sulfuric acid.

Explanation:

The balanced reaction is:

SO₃ + H₂O → H₂SO₄

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:

Being the molar mass of each compound:

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

Then you can apply the following rule of three: if 1 mole of sulfuric acid is produced by the reaction of 80 grams of sulfur trioxide, 4 moles of sulfuric acid is produced from how much mass of sulfur trioxide?

\(mass of sulfur trioxide= \frac{4 moles of sulfuric acid* 80 grams of sulfur trioxide}{1 mole of sulfuric acid }\)

mass of sulfur trioxide= 320 grams

320 grams of sulfur trioxide are required to produce 4.00 mol of sulfuric acid.

The mass of the required compound is 320 grams

Given the chemical equation expressed as:

\(SO_3 + H_2O \rightarrow H_2SO_4\)

According to stochiometry, 1 mole of SO3  produces 1 mole of H2SO4, hence the moles of SO3 will also be 4.00moles

Determine the mass of SO3

Mass = mole * molar mass

Mass = 4.0 * [32+3(16)]

Mass = 4.0 * 80

Mass = 320 grams

The mass of the required compound is 320 grams

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The pressure of a gas at a constant temperature in a sealed container will gradually decrease. Option C.

Gases are made up of particles molecules or atoms in constant random motion. Gas particles constantly collide with each other and with the walls of the container. These collisions are elastic. That is, there is no net energy loss due to collision. The pressure of a constant temperature gas in a closed container gradually decreases.

The above statement is incorrect because the pressure of a gas at a constant temperature depends on the volume of the gas. If the container is sealed, the volume of gas is also constant. Collisions are completely elastic. When two molecules collide, they change direction and kinetic energy, but all kinetic energy is conserved. Collisions are not sticky. The average kinetic energy of gas molecules is directly proportional to absolute temperature.

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Answer

F) The pressure of a gas exerted on the walls of its container is inversely proportional to the volume of the gas when the temperature of the gas remains constant.

Explanation

Boyle's law states that the volume of a given mass of gas varies inversely with the pressure when the temperature is kept constant. An inverse relationship is described in this way. As one variable increases in value, the other variable decreases. He discovered that doubling the pressure of an enclosed sample of gas, while keeping its temperature constant, caused the volume of the gas to be reduced by half.

Answer:

There are 4 valence electrons.

Explanation:

The outer most electrons are the valence ones.

Answer:

THE NUMBER OF ATOMS OF CHLORINE IN THE SAMPLE IS 25.95 * 10^45 ATOMS.

Explanation:

Number of molecules = 4.31 * 10^22 molecules of SCl2

From Avogadro's rule which states that equal volume of gases at the same temperature and pressure have the same number of molecules.

1 mole = 6.022 * 10 ^ 23 particles or atoms

So therefore, we equate the given value of SCl2 molecules and solve for the number of atoms of chlorine in the molecule

1 mole = 6.022 * 10^23 atoms

From the break down of SCl2

SCl2 -------> S+ + 2Cl -

So therefore, 2 moles of chlorine is present

2 moles = 2 * 6.022 *10^23

4.31 * 10^22 moles = x atoms

= 4.31 * 10 ^22 * 2 * 6.022 * 10^23 / 2

= 25.95482 * 10^45 atoms

In conclusion, the number of atoms of chlorine present in the sample is 25.95 * 10^45 atoms.

Answer:

The mass of an atom is equal to the protons plus the neutrons

Answer: Explanation:

Water wheels have several important parts that work together (see diagram).

*Flowing water (delivered via a channel called a mill race)

*Large wooden or metal wheels.

*Paddles or buckets (arranged evenly around the wheel)

*Axle.

*Belts or gears.

Answer:

Explanation:

m-mass of substance

s- specific heat capacity

dt- change in temperature.

So equating,  mgh=ms(dt),  we get  (dt)=gh/s.

The work done by the gas when a sample of gas expands from 1.0 m³ to 4.0 m³ while its pressure decreases from 40 Pa to 10 Pa is -30 J. The work done by the gas is 75 J.

The work done by the gas is represented by the formula given below;

W = PΔV

Where;W = Work done by the gas

P = Pressure

ΔV = Change in Volume

Therefore, the work done by the gas is given by;

W = PΔV

Work done,

W = 1/2(P₁ + P₂) ΔV

Where;P₁ = Initial pressure

P₂ = Final pressure

ΔV = Change in Volume

Here, the initial pressure, P₁ = 40 Pa

Final pressure, P₂ = 10 Pa

Change in Volume,

ΔV = V₂ - V₁ = 4.0 m³ - 1.0 m³ = 3.0 m³

Substituting the values of P₁, P₂ and ΔV into the equation gives;

W = 1/2(40 Pa + 10 Pa) × 3.0 m³

W = 1/2(50 Pa) × 3.0 m³

W = 75 J

The work done by the gas is 75 J.

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The state change occurs when the glass melts.

The matter is anything that has mass and occupies space.

The different states of matter are solid, liquid, gas, and plasma.

The properties of the different types of matter can be understood by looking at the arrangement of molecules.

When a solid substance is heated beyond its melting point, it changes its state from solid to liquid.

When liquid is heated beyond its vaporizing point, it changes its state from liquid to gas.

Solids are closely packed and have a definite shape and size.

Liquids are loosely packed and take up the space of the container.

Gas has high intermolecular spacing and the gases are not rigid.

Ground glass is melted under light heat and poured into molds.

Recycling glass involves changing the state of glass from solid to liquid state.

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The molar conductivity of KCl at this concentration and  transport numbers and molar ionic conductivity of K+ and Cl– are

Generally, The transport number, t, of an ion can be calculated using the equation: t = (μi x Ci) / Λm,

where

Given that the electric mobility of

K+ is 5.9 x 10^-4 cm^2 V^-1 s^-1, the electric mobility of Cl- is 6.14 x 10^-4 cm^2 V^-1 s^-1, and the concentration of KCl is 0.30 mol L^-1, we can calculate the transport numbers as:

t(K+) = (5.9 x 10^-4 cm^2 V^-1 s^-1 x [K+]) / Λm t(Cl-)

= (6.14 x 10^-4 cm^2 V^-1 s^-1 x [Cl-]) / Λm

where

[K+] and [Cl-] are the molar concentrations of K+ and Cl- ions, respectively.

The molar ionic conductivity, Λi, of an ion can be calculated using the equation: Λi = μi x Ci,

where

Given that the electric mobility of K+ is 5.9 x 10^-4 cm^2 V^-1 s^-1 and the concentration of K+ is 0.15 mol L^-1, the molar ionic conductivity of K+ is:

Λ(K+) = 5.9 x 10^-4 cm^2 V^-1 s^-1 x 0.15 mol L^-1

Λ(K+) =8.85×10−5

Similarly, given that the electric mobility of

Cl- is 6.14 x 10^-4 cm^2 V^-1 s^-1 and the concentration of Cl- is 0.15 mol L^-1, the molar ionic conductivity of Cl- is:

Λ(Cl-) = 6.14 x 10^-4 cm^2 V^-1 s^-1 x 0.15 mol L^-1

Λ(Cl-) =9.21×10^−5

Finally, the molar conductivity of KCl can be calculated as:

Λm = Λ(K+) + Λ(Cl-)

=9.21×10^−5+8.85×10^−5

Λm =1.806×10−4

The transport numbers of K+ and Cl- can be calculated by

t(K+) = Λ(K+) / Λm and

t(Cl-) = Λ(Cl-) / Λm respectively.

t(K+) = 8.85×10−5/1.806×10−4 '

t(K+)=4.90033223×10^−9

and

t(Cl-) =9.21×10^−5/1.806×10−4

t(Cl-) =5.09966777×10^−9

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The concept is to provide diagnostic images using the optimal amount of radiation. If the index is too low, it may indicate poor image quality. If the dose index is too high, it may mean using more radiation than is needed for imaging.

There are three kinds of index numbers, namely:

a. Price index figures, namely comparative figures to measure price changes from one period to another.

b. Number index (quantity), which is a comparison number to measure changes in the amount from one period to another.

c. Value index number, which is a comparison number to measure changes in value from one period to another. Value is calculated by multiplying the price by the amount (quantity).

Your question is incomplete but most probably your full question was:

Explain. What is the Index Value for an exposure of low?

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Methyl phosphine (CH3PH3) has the strongest intermolecular forces among the given compounds.

The strength of intermolecular forces is determined by the type of bond present in a substance. Methyl phosphine has dipole-dipole interactions, which are stronger than the London dispersion forces present in the other compounds. This is the main reason for this compound having the strongest intermolecular forces.

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Answer:

0.987 g/ml

Explanation:

The formula for density is mass/ volume.

Substituting our values in we get density = 3.75/ 3.8 = 0.9868g/ml.

Hope this helps! Let me know if you have any questions :)