1 - Make the electronic distribution of the elements below and locate which groups they belong in the periodic table

A - Mg =

B - O =

C - Fe =

The wavelength of these radio waves with a frequency 18GHz is equal to 0.0167m.

Microwave transmission is the method of transmission of information by electromagnetic waves that lie in the microwave range (1 m - 1 mm) of the electromagnetic spectrum. Microwave signals are limited to the line of sight, so long-distance transmission using these signals needs a series of repeaters to create a microwave relay network.

The relationship between wavelength (λ) and frequency (ν) can be expressed as follow:
λ = c/ν

Given, the frequency of the radio wave = 18GHz

The frequency in (per second) = 18 × 10⁹ s⁻¹

The wavelength of the radiowaves, λ = c/ν

where c is the speed of light and has a value of 3× 10⁸ m/s.

λ = c/ν = 3× 10⁸ m/s./ 18 × 10⁹ s⁻¹

λ = 0.0167 m

Therefore, the wavelength of these radio waves is equal to 0.0167m.

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Your question was incomplete, most probably the complete question was,

NASA communicates with the Space Shuttle and International Space Station using Ku-band microwave radio. Suppose NASA transmits a microwave signal to the Space Shuttle using radio waves with a frequency of 18GHz. Calculate the wavelength of these radio waves.

Be sure your answer has the correct number of significant digits.

Answer:

A horizontal row in the periodic table, which signifies the totoal number of electron shells in an element's atom.

Explanation:

Hope this helpss)):

Name - Function

The brain regulates a variety of bodily processes, such as movement, sensation, thinking, emotion, and behavior.

Activity and Part of the brain it involves are:

a. Testing a hamburger - Sensory cortex in the parietal lobe

b. Artistic ability - Right hemisphere of the cerebrum

c. Kicking a soccer ball - Motor cortex in the frontal lobe

d. Rate of breathing - Medulla oblongata in the brainstem

e. Tying your shoes - Cerebellum

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Answer:

Reactants are starting materials and are written on the left-hand side of the equation. Products are the end result of the reaction and are written on the right-hand side of the equation.

The path of exhaled oxygen-poor and carbon dioxide-rich air leaving the body begins in the body's cells, where oxygen is used for cellular respiration, and carbon dioxide is produced as a waste product.

When we breathe in, our body takes in oxygen-rich air through the mouth or nose. This air then travels through the trachea, or windpipe, and into the lungs. In the lungs, the oxygen is transferred to the bloodstream while carbon dioxide is released from the blood and into the air sacs of the lungs.

Next, the oxygen-rich blood is pumped by the heart to different parts of the body, where it is used for energy production. As the body uses oxygen, it produces carbon dioxide as a waste product.

This carbon dioxide is carried by the bloodstream back to the lungs, where it is released into the air sacs. Finally, when we exhale, the air travels back up the trachea and out of the mouth or nose, carrying the carbon dioxide-rich and oxygen-poor air out of the body.

This process of inhaling oxygen and exhaling carbon dioxide is known as respiration and is essential for the proper functioning of the body's cells and organs.

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Answer:

Explanation:

boiling

According to the forces of attraction, boiling takes place when the kinetic energy of molecules overcomes the intermolecular forces.

Forces of attraction  is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases  as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

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A xenon atom has five rotational degrees of freedom. These degrees of freedom refer to the number of ways in which an atom or molecule can rotate in space.

In the case of xenon, it is a symmetric molecule with a spherical shape, which means that it has three rotational degrees of freedom corresponding to rotation around the x, y, and z-axes. Additionally, xenon has two more degrees of freedom corresponding to internal rotation about two of its molecular axes.

These rotational degrees of freedom are important in understanding the thermodynamic properties of a system, such as its heat capacity and entropy. In the case of xenon, its five rotational degrees of freedom contribute to its high heat capacity and make it a useful component in lighting and electronic devices.

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the electronegativity difference (AEN):

<0.5: covalent (non polar)

0.5- 1.7: covalent (polar)

> 1.7 : ionic

BaCl₂

Ba = 0.9

Cl = 3

Cl - B = 3 - 0.9 = 2.1 (ionic)

Answer:

I think the answer is assume

The kinds of intermolecular forces that are present in each element or compound are as follows:

1. Kr - dispersion forces

2. NH3 - dispersion forces, dipole-dipole forces and hydrogen bonding

3. NO - dispersion forces and dipole-dipole forces

4. CH4 - dispersion forces


Let's understand this in detail:

The electronegativity of the atom in question and the relative proximity of the atom to other atoms determines the strength of the intermolecular forces.

In Kr, the intermolecular forces present are the weakest type, dispersion forces. This is because Kr is a noble gas with the lowest electronegativity among the elements.

In NH3, stronger dispersion forces, dipole-dipole forces, and hydrogen bonding are present because nitrogen has a high electronegativity and is surrounded by three hydrogen atoms with partial positive charges due to their electron-deficient nature.

In NO, there are only dispersion and dipole-dipole forces since no hydrogen atom is present to form hydrogen bonding.

Finally, in CH4, only dispersion forces are present since the four hydrogen atoms do not form a tetrahedral structure due to their symmetrical electron distribution.

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The maximum hardness obtained in a piece of steel is primarily determined by its carbon content. Steel is an alloy of iron and carbon, and the carbon atoms play a crucial role in influencing the material's hardness.

When steel is heated and then rapidly cooled in a process called quenching, the carbon atoms become trapped within the iron lattice structure. This rapid cooling prevents the carbon atoms from diffusing and forming larger crystals, resulting in a harder microstructure.

The higher the carbon content in the steel, the greater the potential for hardness. Steels with higher carbon concentrations can form more carbide particles, which contribute to increased hardness.

However, it's important to note that other factors can also affect the hardness of steel, such as the presence of other alloying elements (e.g., chromium, manganese) and the specific heat treatment processes employed. These factors can influence the formation of different microstructures and phases, affecting the steel's overall hardness.

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Answer:

That is a good question... Maybe Because it is artificial and the makers do not know how to mimic nature.

Explanation:

Answer:

Explanation:

The number of particles can be found by using the formula

N = n × L

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is 6.02 × 10²³ entities

We have

N = 4.8 × 6.02 × 10²³

We have the final answer as

Hope this helps you

The probability that at least one of the specialists will detect tuberculosis in this person is 0.9994.

Given that a person with tuberculosis is given a chest x-ray. Four tuberculosis x-ray specialists examine each x-ray independently. If each specialist can detect tuberculosis 79% of the time when it is present.The probability that at least 1 of the specialists will detect tuberculosis in this person is to be calculated.

P( at least 1 specialist detects tuberculosis )=?

The probability that each specialist can detect tuberculosis = P(Detecting tuberculosis) = 79/100 = 0.79

The probability that the specialist cannot detect tuberculosis = P(Not detecting tuberculosis) = 1 - P(Detecting tuberculosis) = 1 - 0.79 = 0.21

Let A be the event that the specialist can detect tuberculosis.

Let B be the event that the specialist cannot detect tuberculosis.

Then, P(A) = 0.79, and P(B) = 0.21

Now, we need to find the probability that at least one of the specialist detects tuberculosis.The probability that at least one of the specialist detects tuberculosis is given as :

P(at least one of the specialist detects tuberculosis) = 1 - P(no specialist detects tuberculosis)

P(no specialist detects tuberculosis) = P(Not detecting tuberculosis) for the 1st specialist × P(Not detecting tuberculosis) for the 2nd specialist × P(Not detecting tuberculosis) for the 3rd specialist × P(Not detecting tuberculosis) for the 4th specialist = 0.21 × 0.21 × 0.21 × 0.21 = (0.21)^4

Putting this value in the formula :

P(at least one of the specialist detects tuberculosis) = 1 - P(no specialist detects tuberculosis)

= 1 - (0.21)^4 = 0.9994= 0.9994 (rounded to four decimal places)

Therefore, the probability is 0.9994.

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Answer:

320.23g of CH3OH.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is given below:

CO(g) + 2H2(g)—> CH3OH(l)

Next, we shall determine the masses of CO and H2 that reacted and the mass of CH3OH produced from the balanced equation. This is illustrated below below:

Molar mass of CO = 12 + 16 = 28g/mol

Mass of CO from the balanced equation = 1 x 28 = 28g

Molar mass of H2 = 2x1 = 2g/mol

Mass of H2 from the balanced equation = 2 x 2= 4g

Molar mass of CH3OH = 12 + (3x1) + 16 + 1 = 32g/mol

Mass of CH3OH from the balanced equation = 1 x 32 = 32g

From the balanced equation above,

28g of CO reacted with 4g of H2 to produce 32g of CH3OH.

Next, we shall determine the the limiting reactant. This is illustrated below:

From the balanced equation above,

28g of CO reacted with 4g of H2.

280.2g of CO will react with =

(280.2 x 4)/28 = 40.03g of H2.

From the calculations made above, we can see that only 40.03g out of 50.5g of H2 is required to react completely with 280.2g of CO.

Therefore, CO is the limiting reactant and H2 is the excess reactant.

Finally, we shall determine the mass of methanol, CH3OH produced from the reaction.

In this case, the limiting reactant will be used because it will give the maximum yield of the reaction since all of it is used up in the reaction. The limiting reactant is CO and the mass of methanol, CH3OH produced can be obtained as follow:

From the balanced equation above,

28g of CO reacted to produce 32g of CH3OH.

Therefore, 280.2g of CO will react to produce = (280.2 x 32)/28 = 320.23g of CH3OH.

Therefore, 320.23g of CH3OH were produced from the reaction.

The third law of thermodynamics describes the entropy of a: solid.

The third law of thermodynamics states that the entropy of a pure crystalline substance approaches zero as the temperature approaches absolute zero (0 Kelvin or -273.15 degrees Celsius). This law implies that at absolute zero, a perfectly ordered and pure crystalline solid will have zero entropy.

The third law of thermodynamics is not specific to liquids or gases but applies to solids. In a solid, the molecules are highly ordered and have fixed positions in a regular lattice structure. As the temperature decreases towards absolute zero, the thermal motion of the molecules reduces, and the system becomes more ordered, resulting in a decrease in entropy.

In contrast, liquids and gases have higher entropy compared to solids at absolute zero because their molecules have more freedom of movement and are not as tightly arranged. Therefore, the third law of thermodynamics specifically addresses the entropy of solids and does not apply to liquids or gases.

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In a shallow cylindrical lake with a radius of 4 km and an average water height of 5 m, a type A exhaust basin recorded a total water loss of 4.5 cm during a summer month.

The task is to calculate the evaporation of the lake and the volume of lake water in cubic meters for that specific time period, assuming an evaporation coefficient of 0.7. To calculate the evaporation of the lake, we first convert the recorded water loss from centimeters to meters. The total water loss is 4.5 cm, which is equal to 0.045 meters.

The evaporation from the lake can be determined by multiplying the water loss by the evaporation coefficient. In this case, the evaporation coefficient is given as 0.7. So, the evaporation from the lake is calculated as:

Evaporation = Water loss * Evaporation coefficient

Evaporation = 0.045 m * 0.7 = 0.0315 m

Therefore, the evaporation of the lake during the specified time period is 0.0315 cubic meters.To calculate the volume of lake water, we need to consider the shape of the lake, which is a shallow cylinder. The formula for the volume of a cylinder is:

Volume = π * radius^2 * height

Given that the radius of the lake is 4 km (4000 m) and the average water height is 5 m, we can calculate the volume of the lake as:

Volume = π * (4000 m)^2 * 5 m = 251,327,412 m^3

Therefore, the volume of lake water for the specific time period is approximately 251,327,412 cubic meters.

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Answer:

It is now known that defects in cilia and flagella assembly or function give rise to a wide spectrum of human diseases including infertility, loss of vision, kidney cysts, respiratory defects, skeletal anomalies, and neurological disorders.

2.50 g of helium gas at STP would occupy a volume of 14.0 liters.

Standard temperature and pressure (STP) conditions of 0°C and 1 atm, we can use the molar volume of a gas at STP, which is 22.4 L/mol.

1. Helium seems to have a molar mass of 4.00 g/mol.

Therefore, we can calculate the number of moles of helium as:

moles of He = mass of He divided by molar mass of He

= 2.50 g / 4.00 g/mol

= 0.625 mol

Then, we can use the molar volume of a gas at STP to calculate the volume of helium gas:

volume of He = moles of He x molar volume of gas at STP

= 0.625 mol x 22.4 L/mol

= 14.0 L

2.50 g of helium gas at STP would occupy a volume of 14.0 liters.

2. The molar mass of sodium is 22.99 g/mol. Therefore, we can calculate the number of moles of sodium as:

moles of Na = number of atoms of Na divided by Avogadro's number

= 5.0 x 10²⁵ atoms / 6.022 x 10²³ atoms/mol

= 83.0 mol

Then, we can use the molar mass of sodium to calculate the mass of sodium:

mass of Na = moles of Na x molar mass of Na

= 83.0 mol x 22.99 g/mol

= 1900 g

Therefore, 5.0 x 10²⁵ atoms of sodium have a mass of 1900 g.

3. The molar mass of Ni is 58.69 g/mol. Therefore, we can calculate the number of moles of Ni as:

moles of Ni = mass of Ni divided by molar mass of Ni

= 3.95 g / 58.69 g/mol

= 0.0673 mol

Then, we can use Avogadro's number to calculate the number of atoms of Ni:

number of atoms of Ni = moles of Ni x Avogadro's number

= 0.0673 mol x 6.022 x 10²³ atoms/mol

= 4.05 x 10²² atoms

Therefore, 3.95 g of Ni contain 4.05 x 10²² atoms.

4. The molar mass of Xe is 131.29 g/mol. Therefore, we can calculate the number of moles of Xe as:

moles of Xe = mass of Xe divided by molar mass of Xe

= 15 kg / 131.29 g/mol

= 114 mol

Then, we can use Avogadro's number to calculate the number of atoms of Xe:

number of atoms of Xe = moles of Xe x Avogadro's number

= 114 mol x 6.022 x 10^23 atoms/mol

= 6.87 x10²⁵ atoms

Therefore, a 15 kg sample of Xe gas contains 6.87 x 10²⁵ atoms.

5. A gas's molar volume at STP is 22.4 L/mol. Therefore, we can calculate the number of moles of Ar as:

moles of Ar = number of atoms of Ar divided by Avogadro's number

= 45,000,000 atoms / 6.022 x 10²³ atoms/mol

= 7.47 x 10⁻¹⁷ mol

Then, we can use the molar volume of a gas at STP to calculate the volume of Ar gas:

volume of Ar = moles of Ar x molar volume of gas at STP

= 7.47 x 10⁻¹⁷ mol x 22.4 L/mol

= 1.67 x  10⁻¹⁵ L

Therefore, 45,000,000 atoms of Ar would occupy a volume of 1.67 x 10⁻¹⁵ liters at STP.

6. The molar mass of CO₂ is 44.01 g/mol. Therefore, we can calculate the number of moles of CO₂ as:

moles of CO₂ = mass of CO₂ divided by molar mass of CO₂

= 75 g / 44.01 g/mol

= 1.70 mol

Then, we can use Avogadro's number to calculate the number of atoms of CO₂:

number of atoms of CO₂ = moles of CO₂ x Avogadro's number

= 1.70 mol x 6.022 x 10²³ atoms/mol

= 1.02 x 10²⁴ atoms

Therefore, a 75 g sample of CO₂ contains 1.02 x 10²⁴ atoms.

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Answer:

The true statement is: "There is more energy in steam at 100°C than water at 100ºC."

This is because steam at 100°C has more thermal energy than water at 100ºC because it has undergone a phase change from liquid to gas, which requires additional energy.

The other statements are not true:

   To condense steam, the temperature must increase, not decrease. Condensation is the process by which a gas (steam) changes phase to a liquid, and this requires the removal of energy, usually through cooling.

   To melt ice, the temperature must increase. Melting is the process by which a solid (ice) changes phase to a liquid, and this requires the addition of energy, usually through heating.

   Iron can exist in all three states of matter (solid, liquid, and gas) depending on the temperature and pressure. However, at room temperature and standard atmospheric pressure, iron is a solid.

Explanation:

The answer is (b). Specialized atom combinations known as functional groups bind to hydrocarbon chains and rings to create organic nutrition.

Any of the countless atom combinations that compose chemical compounds and undertake distinctive reactions on their own are categorized as functional groups. It frequently affects the remaining molecules in each molecule's reactivity. The idea of functional groups can be used as a foundation for categorizing numerous substances based on how they behave. Common functional group examples include the hydroxyl found in alcohols and phenols, the carboxyl found in carboxylic acids, and the carbonyl found in aldehydes, ketones, and quinones. It can be simply defined as an atom or group of atoms inside a molecule that share chemical characteristics when they appear in multiple compounds, despite the fact that other components of the molecule are very different.

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The Complete question is

which of the following best describes a functional group? multiple choice question. large molecules comprised of a glycerol and three fatty acid chains large molecules composed of two or more repeating smaller units special combinations of atoms that attach to hydrocarbon chains and rings to form organic nutrients molecules that are composed of hydrogen and carbon in a long chain or ring-like structure

(a) large molecules comprised of a glycerol and three fatty acid chains

(b) special combinations of atoms that attach to hydrocarbon chains and rings to form organic nutrients

(c) molecules that are composed of hydrogen and carbon in a long chain or ring-like structure

(d) large molecules composed of two or more repeating smaller units

Answer:Nonpolar covalent compound-

Carbon tetrachloride CCl4

Polar covalent compound-Water - H2O.

Ammonia - NH. ...

Sulfur dioxide - SO. ...

Hydrogen sulfide - H2S.

Ionic compoundNaCl, sodium chloride ordinary table salt

Al(OH)3, aluminum hydroxide ingredient in antacids

NaOH, sodium hydroxide lye; used as drain cleaner

K3PO4, potassium phosphate

Explanation:

have a great day ahead" :)

Answer: 2 mol of NaOH

Explanation:

The balanced chemical equation for the reaction is:

Na2O + H2O --> 2NaOH

Looking at this, we can see that 1 mol of Na2O will react with 1 mol of H2O to produce 2 mol of NaOH

Answer:

97.9

Explanation:

m= n*M

M CaCl2= 40+ 35.5*2= 110

m= 0.89*110= 97.9

The mass of the given mole of \(CaCl_2\) is required.

The mass of the given compound is 98.78 g.

Molar mass of \(CaCl_2\)

\(M=40.078+35.453\times 2=110.984\ \text{g/mol}\)

n = Number of moles = 0.89 mol

Mass is given by

\(m=Mn\\\Rightarrow m=110.984\times 0.89\\\Rightarrow m=98.78\ \text{g}\)

The mass of the given compound is 98.78 g.

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The mass number of the third isotope, given the data from the question is 34

The mass number of the third isotope can be obtained as illustrated below:

Relative atomic mass = [(Mass of 1st × Abundance of 1st) / 100] + [(Mass of 2nd × Abundance of 2nd) / 100] + [(Mass of 3rd × Abundance of 3rd) / 100]

32.133 = [(32 × 92.4) / 100] + [(33 × 1.9) / 100] + [(Mass of 3rd × 5.7) / 100]

32.133 = 29.568 + 0.627 + (Mass of 3rd × 0.057)

32.133 = 30.195 + (Mass of 3rd × 0.057)

Collect like term

32.133 - 30.195 = Mass of 3rd × 0.057

1.938 = Mass of 3rd × 0.057

Divide both sides by 0.057

Mass of 3rd = 1.938 / 0.057

Mass of 3rd = 34

Thus, we can conclude that the mass of the 3rd isotope is 34

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Missing part:

See attached photo

Explanation: the answer plant seeds

not skin

Answer:

b

Explanation:

because pressure is inversely proportional to volume.

Also with a larger volume the gas particles will collide less on each other and the walls of the container

A way to decrease the pressure of a gas is to decrease the volume.

Three Ways to Increase the Pressure of a Gas

Temperature, pressure, volume, and the amount of a gas influence its pressure.

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Answer: you have to add the atomic number and the protrons

Explanation:

sulphur2-

K1+
B2+
I1-

Br1-

Explanation:

Note this work was not made by me but by a other brainly user

source

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