How to do this??
Ty for your help if you help!

Answer:

Radio Waves are used for cell phone communication.

1) Suppose the marble usually rolled right to the end of the box without bouncing off anything, what would this tell you about the size of the targets?

That the target is very small, they do not take up much space in the box. The target represents the gold nuclei in the Rutherford experiment, and thus is relatively small.

2.) What conclusions did Rutherford draw from his data and how did the data change the model of the atom?

A large majority of the alpha particles went through the gold foil, but some got deflected back. At the time, it was presumed that an atom was a sphere with the same charge all around. If some but not all the particles were being reflected back, this meant that the positive charge in the atom must be very concentrated- ie. in the center known as a nucleus. This changed the atomic model from the plum pudding model (negative electrons among large positive sphere) to the nuclear model (Mass of atom is in the nucleus with electrons orbiting around). (As in image below)

3) Niels Bohr was a student of Rutherford, Bohr's work went on to modify the atomic model even more. What changes did Bohr make to advance our understanding of the atom?

Instead of random orbits that Rutherford predicted, Bohr proposed specific atomic orbitals. He explained that there are orbital levels around the nucleus and that this is where electrons are. He said that electrons can move up energy levels by adding energy, and move down by releasing energy. These orbitals are what is shown in the Bohr Model.

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the formulas of the compounds that correspond to the names carbon tetrabromide cobalt(ii) CBr4 co(ii), calcium nitrate Ca(NO3)2(H2O)x.

Tetrabromoethane, commonly called carbon tetrabromide or CBr4, is a kind of carbon tetrabromide. It is used as a sedative, an intermediate in the production of agrochemicals, a solvent for greases, waxes, and oils, and in the blowing and vulcanization processes in the plastic and rubber industries. It is a component of compounds that are fire-resistant since it is not flammable. Because of its high density, it is also employed in the separation of minerals. An inorganic substance having the formula Ca(NO3)2(H2O)x is calcium nitrate, popularly known as norgessalpeter (Norwegian Salpeter). The infrequently encountered anhydrous chemical turns into the tetrahydrate by absorbing moisture from the atmosphere. Salts come in both colorless anhydrous and hydrated forms. There are other uses for calcium nitrate besides being a component of fertilizers.

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Organic food is the term that is commonly used to describe foods that are grown with little or no use of synthetic chemicals.

Organic farming in India is an agricultural process that uses organic fertilizers and pesticides made from animal or vegetable waste. This agriculture began to respond to environmental problems caused by chemical pesticides and synthetic fertilizers. A new agricultural system that restores, maintains and improves the balance of ecosystems.

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Answer:

Just as the organs in an organ system work together to accomplish their task, so the different organ systems also cooperate to keep the body running. For example, the respiratory system and the circulatory system work closely together to deliver oxygen to cells and to get rid of the carbon dioxide the cells produce.

Explanation:

When two magnets are repelling each other, the following are true:

A magnet is a substance or item that generates a magnetic field. This magnetic field is invisible, but it is responsible for a magnet's most remarkable property: a force that attracts or repels other ferromagnetic elements such as iron, steel, nickel, cobalt, and so on.

Magnets are classified into three types: perpetual magnets, temporary magnets, and electromagnets. Permanent magnets produce a magnetic field without requiring any external magnetism or electrical power.

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The caloric value(in kcal/g) of the potato chips is 0.04467 kcal/g.

Heat absorbed by water:

[tex]Q=m.C.T\\Q=26.8 * (21.4-16.4)*1\\Q=0.134[/tex]

The caloric value of potato chips :

=Kcal/grams of potato chips

[tex]=0.134/3.0\\=0.04467 Kcal/g[/tex]

How to calculate heat absorbed?

Q = mc∆T

What is caloric value?

A food calorie is actually a “kilocalorie.”  In other words, it is the amount of energy needed to raise the temperature of one liter of water by one degree.

Thus, the caloric value of the potato chips is 0.004467Kcal/g

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The frequency of light with a wavelength of 1.87 x 10-14 m = 1.657*10^-22 Hz

What is frequency of light ?

The frequency is the number of waves that go through a given place in space in a given amount of time, typically one second. It is measured in hertz, which stands for cycles (waves) per second. Color is the frequency of visible light, which spans from 430 trillion hertz for red to 750 trillion hertz for violet.

We must determine the frequency given the wavelength. Where, is the sign for frequency, c is the symbol for the speed of light, and is the symbol for wavelength, the equation that links frequency and wavelength is:

The wavelength is 1.87 x 10-14 m and the speed of light is 3*10^8 m/s

To compute the frequency, let's enter the values in the equation and run the calculations:

f = c/wavelength

f = 3*10^8/ 1.87*10^-14 = 1.657*10^-22 Hz

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In a catalyzed chemical reaction, one function of a catalyst is to increase the number of successful reactant collisions .

catalyzed reaction are the reaction which used to accelerate the rate of the reaction. Catalyst is used to increases the speed of reaction . catalyst minimize the path of the reaction. the main function of the catalyst is to speed up the chemical reaction. the catalyst is not being consumed during the chemical reaction. catalyst is to increase the number of successful reactant collisions .

Thus, In a catalyzed chemical reaction, one function of a catalyst is to increase the number of successful reactant collisions .

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1) The reaction is as :

2C₂H₃AgO₂    +    K₂CrO₄   ------>   2C₂H₃KO₂   +    Ag₂CrO₄

2)  chlorine is reduced. bromine is oxidizes.

1) In the question is given that : silver acetate combines with potassium chromate to produce potassium acetate and the final product is silver chromate. the reaction is given as :

2C₂H₃AgO₂    +    K₂CrO₄   ------>   2C₂H₃KO₂   +    Ag₂CrO₄

2) When chlorine gas is bubbled through a solution of sodium bromide, a reaction occurs which produces salt (sodium chloride) and bromine gas.

Cl₂   +   2NaBr   ----->   2NaCl    + Br₂

The chlorine oxidation state changes to 0 to -1 . so chlorine is reduced.

The oxidation state of brome is changes from -1 to  . so bromine is oxidizes.

Thus, 1) The reaction is as :

2C₂H₃AgO₂    +    K₂CrO₄   ------>   2C₂H₃KO₂   +    Ag₂CrO₄

2)  chlorine is reduced. bromine is oxidizes.

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A gaseous solution contains 41% O₂ and 59% N₂ by mass. The mole fraction of Oxygen is 0.377, while the mole fraction of  Nitrogen is 0.622 in the solution.

What is the mole fraction of each substance in the solution?

41.0g O₃ X {(1 mol O₃) ÷ (32. 0g O₃)} = 1.28 mol O₃

Where the molecular mass of oxygen is 32

For mole fraction of nitrogen:

59.0g N₃ X {(1 mol N₃ ) ÷ (28.02 0g N₃)} = 2.11 mol N₃

Where the molecular mass of nitrogen is 28.02

Total mol = 1.28 + 2.11 = 3.39 mol total

The mole fraction of O₃ in the gaseous solution is

number of O₃ moles ÷ total moles

Mole fraction of O₃ = 1.28 mol O₃ ÷ 3.39 mol total

= 0.377

While the mole fraction of N₃ in the gaseous solution is

number of N₃ moles ÷ total moles

Mole fraction of N₃ = 2.11 mol O₃ ÷ 3.39 mol total

= 0.622

In summary, the oxygen mole fraction is 0.377 and the nitrogen mole fraction is 0.622 in a gaseous solution that contains 41% O₂ and 59% N2 by mass

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The solubility product of the copper(II) iodate is 1.25 * 10^-7

The term solubility has to do with the amount of a substance that is dissolved in water. The solubility product is the equilibrium constant that shows the extent to which a substance is dissolved in water.

We have to convert the solubility of the  copper(II) iodate from g/mL to molarity and we have;

Number of moles = 0.13 g/413 g/mol = 3.15 * 10^-4 moles

Volume of the solution = 100 mL or 0.1 L

Molarity =  3.15 * 10^-4 moles/0.1 L

= 3.15 * 10^-3 M

We now have;

Ksp = [x] [2x]^2

Ksp = 4x^3

Ksp = 4( 3.15 * 10^-3 )^3

Ksp = 1.25 * 10^-7

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The evidence in the question shows that there is a directional evolution that is taking place as the percentage of the tall individuals is increasing.

We know that the term natural selection implies that the organisms that are are better able to live and survive in a habitat are the ones that are able to live longer and reproduce and by so doing, they are able to transfer the favorable traits that they posses to their offspring.

Now we can also relate to the fact that the idea of directional selection is takin place when there is a situation in which the trend in the evolution seems to favor only one type of trait over another the other type of trait and this leads to a gradual increase in the abundance of the favored trait in the population.

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The best fluid for hydration of the university track and field athletes who prepare for the 100 meter dash is the best fluid for hydration of the university track and field athletes who prepare for the 100 meter dash is fruit juice. sports drinks like Gatorade.

So the correct option is sports drink like Gatorade.

Who are field athletes?

Field athletes include sprinters, distance runners, hurdlers, jumpers, and throwers. The first three compete in races on the track, while the jumpers and throwers make up the field athletes.

In conclusion, some fluids for hydration are best suited for certain events.

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The mass, in grams, of 5.90 mol [tex]C_6H_{12[/tex] would be 495.6 grams.

The number of moles in a given amount of substance is the ratio of the mass of the substance and its molar mass.

The statement of the number of moles of substances can be mathematically expressed as follows:

Mole = mass/molar mass

Making molar mass the subject, the equation becomes:

Molar mass = mass/mole

Making mass the subject, the equation becomes:

Mass = mole x molar mass.

In this case, we are looking for the mass of a given mole of  [tex]C_6H_{12[/tex].

C = 12 g/mol

H = 1 g/mol

Molar mass of [tex]C_6H_{12[/tex] = (6x12) + (12x1)

                                   = 72 + 12

                                   = 84 g/mol

Hence:

Mass of 5.90 mol  [tex]C_6H_{12[/tex] = 5.90 x 84

                                         = 495.6 grams

In other words, 5.90 mol of [tex]C_6H_{12[/tex] would be equivalent to 495.6 grams of the compound.

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Initial main byproducts of the reaction between concentrated hydro iodic acid and benzyl isopropyl ether are isopropyl alcohol and benzyliodide.

Ethers - The word Ether has been derived from the Latin word ‘aether’ which means ‘to ignite’. They contain an ether group—an oxygen atom connected to two alkyl or aryl groups.

At room temperature and under a high-pressure ethers are usually flammable. The general formula of ether is given as R-O-R, R-O-R’, R-O-Ar or Ar-O-Ar where R represents an alkyl group and Ar represents an aryl group.

The initial stage in the hydrophilic acid cleavage of ethers will be a pre-equilibrium protonation of the ether's oxygen.

The resonance-stabilized benzyl cranium ion and isopropyl alcohol will then be produced when the powerful nucleophile iodide ion displaces isopropyl alcohol from the main group.

It is feasible for the hydroid acid and isopropyl alcohol to react further to produce the specified isopropyl iodide.

Thus, Initial main byproducts of the reaction between concentrated hydro iodic acid and benzyl isopropyl ether are isopropyl alcohol and benzyliodide.

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The order of the atomic radius is;  

1) Potassium, Aluminum, Carbon,  Oxygen

2)  Potassium, Aluminum, Carbon, Oxygen

We know that the atomic radius has to do with the distance between one atom and another in that are not covalently combined. We know that the atomic radius is a function of the group to which the atom belongs.

We know that the atomic radius increases down the group but would tend to decrease across the period as more shells are added to the atom of the element.

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The correct formula of the compound can now be written as [tex]NiCl_{2} .9H_{2} O[/tex]

We know that when we talk about a hydrate, we are talking about a compound that has some molecules of the water of crystallization in it. Thus we have that in this case, the compound that we are considering is nickel chloride.

Given that;

Number of moles of anhydrous salt = Number of moles of hydrated salt

Number of moles of hydrated salt = 25/130 + 18x

Number of moles of anhydrous salt = 11.37 g/130 g/mol

= 0.087 moles

When we now apply the formula, we have;

25/130 + 18x = 0.087 moles

0.087 (130 + 18x) = 25

11.31 + 1.566x = 25

x = 25 - 11.31 /1.566

x = 9

We now get;

[tex]NiCl_{2} .9H_{2} O[/tex]

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When hydrochloric acid dissolves in water, the hydronium ion is created. Analyzing the developing bond modifications is helpful. Hydrochloric acid is acting as an acid, and water is acting as a base. Take into account the variations in bonding between the raw materials and the finished goods.

The hydronium ion (H3O+) observed in the products was produced by joining one of the oxygen atom's lone pairs to a hydrogen atom. A chloride ion was created as a result of the hydrogen-chlorine bond in HCl being broken and the electrons in this bond turning into a lone pair on the chlorine atom. The overall charge of the reactants is the same as the overall charge of the products.

This demonstrates how the new H-Cl bond is created by joining an electron-poor hydrogen atom of the hydronium ion to a lone pair of electrons from the electron-rich chloride ion. The oxygen-hydrogen link breaks because hydrogen can only make one bond, leaving the electrons of the oxygen atom with a lone pair.

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When performing a presumptive blood test with Hemastix, the reason why it necessary to test an unstained area close to the bloodstain under examination as a control is that the likelihood that there is presence of blood, and thus need confirmatory test in lab to know if it is actually blood.

Hemastix reagent strips were initially created for the purpose of detecting blood in urine. It has been determined that this quick and simple test is useful as a presumptive test for the presence of blood.

Note that the presence of a chemical in a sample can be determined or confirmed using a presumptive test, which is a qualitative study. These decisions are typically made following a chemical reaction that results in the production of a certain color. A false positive occurs when a different chemical reacts similarly and yields the desired outcome.

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According to the given statement Object B, by 1 gram per cubic centimeter object has a greater density.

The measure of how densely a substance is pressed together is called density. As the weight per unit volume, it meets that definition. The formula for density, denoted by the symbol D, is given as follows: density = m/V, where m denotes the object's mass and V its volume.

Mass and volume are intimately linked with density. In reality, it explains the precise nature of the connection between the two. By dividing the mass of an object by its volume, we may get its densities. The mass is said to have a low population density if it has a high volume but a tiny mass.

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While gdp was once a key cyclical indicator, its usefulness has declined substantially for all of following reasons except " Requires seasonal adjustments"

What is GDP?

It is the standard measure of value added created through the production of goods and services in a country during a certain period

The usefulness of GDP has declined except for following-

Requires seasonal adjustments

Because of seasonal adjustments, firms are able to predict the economic activity in the region and adjust their inventories,investments and production process accordingly.

Seasonal adjustment ensures that remaining movements in GDP, or any other economic series, better reflect true patterns in economic activity.

Thus the correct answer from above options is

" requires seasonal adjustments"

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note: complete question is

While GDP was once a key cyclical indicator, its usefulness has declined substantially for all of the following reasons except which one? Multiple Choice

The net ionic equation for the reaction that occurs NO2-  + H3O+ = HNO2 + H2O

If HCl is added, then it reacts with the conjugate base of HNO2 means NaNO2.

The ionic equation via breaking all the soluble ionic compounds (the ones marked with an (aq)) into their respective ions. every ion has to be shown with its price and an (aq) to reveal that its miles are present inside the answer. Use coefficients to reveal the variety of every ion present.

A molecular equation is an equation wherein the formulation of the compounds is written as though all materials exist as molecules. An ionic equation is one wherein dissolved ionic compounds are proven as loose ions. Examples of molecular and ionic equations are proven.

Ionic equations and internet ionic equations are usually written most effectively for reactions that arise in answer and strive to show how the ions present are reacting.

If NaOH is added then it must react with the weak acid HNO2.

Thus, the net reaction contains NaNO2.

NaNO2 + HCl =  HNO2 + NaCl

The ionic equation will be:

NO2-  + H3O+ = HNO2 + H2O

(because it is given to use H3O+ instead of H+)

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The frequency of wavelength of 1km 299792.458 Hz.

These molecules already react to the inward motion of the loudspeaker membrane moving toward the source. Frequency and wavelength are inversely proportional to each other. The wave with the greatest frequency has the shortest wavelength. Twice the frequency means one-half the wavelength. For this reason, the wavelength ratio is the inverse of the frequency ratio.

calculation:-

C= wavelength × frequency

frequency = 3 × 10⁸/ 1000 Hz

= 299792.458 Hz.

= 3 ×10⁵ Hz

Based on such a model, we found that mass is not an intrinsic property of the particle. Instead, mass is basically a measure of particle energy. The relations between energy and mass can be directly derived based on the wave properties of the particle. Waves are one of the ways in which energy may be transferred between stores. Waves can be described as oscillations or vibrations about a resting position.

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The frequency of a wavelength of 1km is

299792.458 Hz.

The statement multiple mass extinction events have occurred in Earth’s history is a pattern in the fossil record (Option D).

Multiple mass extinction events are phenomena in the geological periods in which occurred the removal of certain groups of species and it can be tracked by serving the fossils in the fossil record.

Therefore, with this data, we can see that multiple mass-extinction events refer to the disappearance of certain taxonomic groups in the fossil record, which is one of the most common characteristics of this type of record.

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A platinum wire is dipped into a strontium nitrate solution. Then inserted into a burner flame, then the strontium atoms emit a characteristic red color. this is an example of how an element can be identified by its unique atomic emission spectrum.

The goal of an atom's electron arrangement is to keep the energy of the atom as low as feasible. An atom's ground state has the lowest energy level of all the atoms. When the energy is applied to those atoms, the electrons take it in and go to a higher energy level. The electrons in atoms have quantized energy levels, which again means that they must transition from one level to another in discrete increments rather than constantly. An atom is said to be in an excited state when its potential energy exceeds that of the ground state. An excited atom is not a stable atom.

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Due to same d-same shell, that's why first ionization energy of the transition elements .

Ionization energy, also called ionization potential, in chemistry and physics, the amount of energy required to remove an electron from an isolated atom or molecule.

Transition elements (also known as transition metals) are elements that have partially filled d orbitals. IUPAC defines transition elements as an element having a d subshell that is partially filled with electrons, or an element that has the ability to form stable cations with an incompletely filled d orbital.

In transition elements, the first ionization energy of the elements remain constant because of poor shielding in d-subshell. The electrons suffers repulsion due to which their ionic radii does not decrease on moving from left to right. That's why first ionization energy of the transition elements from Sc to Zn fairly constant until Zn.

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Iron metal has a sea of electrons feature. The outside electrons form a sea or pool of delocalized electrons that are free to travel randomly throughout the fixed lattice of positive ions and do not "belong" to any particular atom.

On the Periodic Table of the Elements, iron is a metal that belongs to Group 8 and is a hard, brittle substance. The most common metal, it is pure form, corrodes quickly when exposed into humid air and high temperatures. Iron is also considered to make up a significant portion of the Earth's core and is the fourth most prevalent metal by weight in the Earth's crust. According to the Los Alamos National Laboratory, it is abundant in the sun and stars in addition to being widely distributed on Earth. According to Jefferson Lab, iron is essential for the survival of all living things.

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The phrase "axial tilt" is essential to understanding why the season change , the words or phrases from the article provided context clues to the meaning of the phrase " axial tilt" is orbits and 23.5 degree offset.

The axial tilt also called as obliquity. The axial tilt is the angle between the objects rotational axis and its orbital axis  , perpendicular to the orbital plane. The axial tilt is about 23.5 degree. due to this the sun shines on different latitudes with different angle.

Thus, The phrase "axial tilt" is essential to understanding why the season change , the words or phrases from the article provided context clues to the meaning of the phrase " axial tilt" is orbits and 23.5 degree offset.

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Answer:

A: 2 and 4

Explanation:

ttt

Mass of NaOH that is required to make the solution is 16 grams

To find out the mass of the Sodium hydroxide that is required to make the solution, we need to know the concentration terms.

The concentration of a substance is the quantity of solute present in a given quantity of solution. Concentrations are usually expressed in terms of molarity, defined as the number of moles of solute in 1 L of solution

The formula for concentration is given as:

Concentration =     Moles        

                             Vol of Solution

⇒ Number of moles = Volume × Concentration

                 Moles = 0.10 L × 4.0 Mol/L

                           = 0.4 Moles

Mass of NaOH = Number of moles × Molecular weight

                        = 0.4 mol × 40 ⇒ 16 grams

Therefore the mass of NaOH required to make the solution is 16 grams

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