(02.03 LC)
Which physical evidence supports the evolution of Earth due to deposition?

The speed of the sound wave is 340 mrter per second.

f = frequency of sound wave = 680 hertz

λ = wavelength of sound wave = 0.5 meter

v = speed of the sound wave

We know that the velocity of a sound wave is given by

speed of sound wave = frequency wave of sound x wavelength of sound wave

v = f λ

Substituting the above values into the above equation

v = (680 hertz) (0.5 meters)

v = 340 meters per second

Therefore the speed of sound waves is 340 meters per second.

Sound waves are pressure waves. They can be seen as pressure fluctuations over time. Sound waves are transverse waves. To hear the sound of a tuning fork, the tines on the fork must move air from the fork to the ear. Most sound waves are produced by vibrating objects. Sound is a kind of energy produced by vibration.

These vibrations create sound waves that travel through media such as air water, and wood. When an object vibrates it creates motion in the particles of the medium.

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The empirical formula of the caffeic acid is C₂H₂O.

The mass composition of the carbon and hydrogen in the carbon dioxide and water respectively is calculated as follows;

mass of carbon in 220 mg of CO₂ = (12 x 0.22 g)/(44) = 0.06 g

mass of hydrogen in 40.3 mg of H₂O = (2 x 0.0403 g) / (18) = 0.0045 g

mass of oxygen = 0.1 g - (0.06 g + 0.0045 g) = 0.0355 g

The molar composition of the elements is calculated as follows;

H = 0.0045 /1 = 0.0045

C = 0.06 / 12 = 0.005

O = 0.0355 / 16 = 0.0022

Divide through with the smallest molar composition

H = 0.0045 / 0.0022 = 2

C = 0.005/0.0022 = 2

O = 0.0022/0.0022 = 1

The empirical formula is C₂H₂O

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The complete question is below:

Combustion of 1.00 × 102 mg of caffeic acid yields 220 mg of CO2 and 40.3 mg of H2O. find the empirical formula of the caffeic acid.

The equilibrium concentrations of A, B, and C at equilibrium are:

The equilibrium concentrations of A, B, and C are calculated from the equilibrium equation below as follows:

Kc = [C]⁴ /  [A]³ * [B]²  -----(1)

Kc = 1.33 * 10

The initial concentrations of A and B are as follows:

A = 1.80 mol / 1 L = 1.8 M

B = 3.50 mol / 1 L = 3.50 M

The concentrations at equilibrium are given by the ICE table below:

   3 A (g)   +    2 B (g) ⇄ 4 C (g)

I   1.80            3.50           0

C  - 3x           - 2x           + 4x

E  1.80 - 3x   3.50 - 2x    4x

Substituting the concentrations at equilibrium into the equilibrium equation above

1.33 * 10³¹  = 4x⁴ / (1.80 - 3x)³ * (3.50 - 2x)²

x = 0.56

Therefore;

the concentration of A = 1.80 - 3 * 0.56

the concentration of A = 0.12 M

the concentration of B = 3.50 - 2 * 0.56

the concentration of B = 2.38 M

the concentration of C = 4 × 0.56

the concentration of C = 2.24 M

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Each isotopes has  a different atomic mass , and each occurs in nature in different abundance this statement is true.

Isotopes can be defined as varieties of chemical elements that have the same number of protons and electrons but  different numbers of neutrons. In other words, isotopes are varieties of elements that differ in their number of nucleons (the total number of protons and neutrons)  due to the difference in the total number of neutrons in their nuclei. The total number of neutrons in the nucleus of an isotope can be determined by subtracting the atomic number of the element from the mass number of the isotope.

For example, the  mass number of the isotope 12C of carbon is 12. The atomic number of carbon is 6. Therefore, the isotope carbon-12 has a total number of neutrons of 6.

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This reaction is exothermic reaction and amount of heat that was released or absorbed by the reaction is 208.8kJ and reaction enthalpy means ΔH is 705.91kJ/mol

An exothermic process releases heat causing the temperature of the immediate surroundings to rise

Here given reaction is

KOH → K⁺ + OH⁻

So, here given data is 14.4 gram of potassium hydroxide in 250 gram of water and the temperature of water rise from 20°C to 34.5°C and

We have to find which type of reaction is this =? and

Calculate heat released or absorbed by this reaction =? and

Calculate reaction of enthalpy ΔH = ?

So this reaction is exothermic because when potassium react with water it gives potassium hydroxide and in that potassium hydroxide the potassium is positive charge and OH has negative charge

Amount of heat released or absorbed by the reaction the formula are

q = m×c×ΔT and ΔT =  20°C - 34.5°C = 14.5°C and c = 0.452J/g°C

q = 14.4 gram×0.452×14.5°C

q = 94.377kJ

Reaction enthalpy means  ΔH so,

ΔHreaction = m×s×ΔT

ΔHreaction =  14.4 gram×94.377kJ×14.5°C

ΔHreaction = 705.91kJ/mol

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Al₃⁺(aq) + 3OH⁻(aq) → Al(OH)₃(s) is the first and Al³⁺(aq) + 3NH₄OH → Al(OH)₃(s) +3NH₄⁻(aq) is the second net ionic equations for the addition of aqueous ammonia to aluminum nitrate

The net ionic equation is the chemical equation that shows only those elements or compounds or ions that are directly involved in the chemical reaction

So, first and second net ionic equations for the addition of aqueous ammonia to aluminum nitrate are

Complete ionic equation is

Al₃(aq) + 3NO₃(aq) + 3NH₄⁻(aq) + 3OH⁻(aq) → Al(OH)₃ (s) + 3NH₄⁺(aq)+ NO₃⁻(aq)

So two net ionic equations are

Al₃⁺(aq) + 3OH⁻(aq) → Al(OH)₃(s)

Al³⁺(aq) + 3NH₄OH → Al(OH)₃(s) +3NH₄⁻(aq)

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Considering the given statements about the filament sliding model in muscles, the statement that is false is;

Muscle filaments or myofilaments are the three protein filaments that make up the myofibrils in muscle cells.

There are three main proteins filaments that make up the myofibrils, and they are:

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The Net force which is acting on the object is 20.12 N and the direction (θ) of the net force is 26.56° towards the South of East. The net force is a resultant of both the forces.

Th net force is the vector sum of all the forces which are acting on a particle or object. The force on the object in the diagram is given below as follows:

Force 1, F₁ = 18 N (force acting in a direction to the east)

Force 2, F₂ = 9 N (force acting in a direction south)

The two forces makes the two sides of a right-angled triangle in the diagram:

Net force can be determined using Pythagoras rule as follows:

Net force, F = √[(F₁)² + (F₂)²]

Net force = √ [(18)² + (9)²]

Net force = √ (324 + 81)

Net force = √ 405

Net force = 20.12 N

The direction of the Net force (θ) is determined as follows:

θ = tan⁻¹ (9 / 18)

θ = tan⁻¹ (0.5)

θ = 26.56° towards South of East

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Answer:

determining the melting point of a substance

Explanation:

The molarity of the aqueous solution is determined as 0.72 M NaOH.

Molarity is used to express the concentration of a solution. It is described as the number of moles of a solute in a given concentration of a solution.

Mathematically, molarity is given as;

M = n/V

where;

The volume of the water is calculated as follows;

volume = mass / density

volume = (5 kg) / (1000 kg/m³)

volume = 0.005 m³

The volume of the water in liters is calculated as follows;

volume = 0.005 m³ = 5 liters

The given parameters;

number of moles of the solute = 3.6 moles

Molarity = 3.6 moles / 5 L

molarity = 0.72 M

Thus, the molarity of the aqueous solution of sodium hydroxide is determined from the ratio of number of moles to the volume of the solution.

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The number of moles of MgO produced when 0.20 mole of O₂ reacts completely is 0.40 mole

Mole is the SI unit of amount of substance of a specified elementary entity

Here given data is number of moles of MgO produced when 0.20 mole of O₂ reacts we have to find mole = ?

So the balanced equation is

2Mg + O₂ → 2MgO

So, the number of moles of MgO = (0.20 mol of O₂ )×(2 mol of MgO) / (1 mol of O₂)

= 0.40 mole

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203 mL of 0.2950 M HCI is required to neutralize 75.00 mL of 0.6000 mL NaOH.

Hcl + NaOH [tex]\rightarrow[/tex] Nacl + H2O

Form dilution formula:

M1V1=M2V2.

So M1=0.6000M, V1=0.075L, M2=0.2950M HCl, V2=?

 V2  = M1V1/M2

        = (0.8)(0.075)/0.2950

        =0.2033L=203 mL.

Dilution is the process of "lowering the concentration of a solute in a solution simply by  adding more solvent, such as water, to the solution." Diluting a solution requires adding a solvent without adding a solute.

A popular way to make a solution of a given concentration is to take a higher concentration  and add water until the required concentration is reached. Dilution is the term for this procedure. Dilution can also be done by mixing a higher concentration solution with a lower concentration. Since stock solutions are often obtained and stored in very concentrated concentrations, dilution of the solutions is a mandatory procedure in the laboratory.

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The balanced chemical equation for the neutralization reaction is Al(OH)₃ + 3HNO₃ ----> Al(NO₃)₃ + 3H₂O.

A balanced chemical reaction is defined as the equation in which the number of atoms in each reaction remains the same on both sides like on the product side and the reactant side. In a balanced chemical equation, the mass, as well as the change, remains the same in a balanced chemical equation.

A neutralization reaction is a reaction in which the acid reacts quantitatively with a base to form salt and as well as water is known as neutralization reaction. In a neutralization reaction, there is a combination of H+ ions and OH– ions that form water.

The balanced chemical equation for the given value of the neutralization reaction is given below.

 Al(OH)₃ + 3HNO₃ ----> Al(NO₃)₃ + 3H₂O, the equation is balanced.

So we can conclude that  Al(OH)₃ + 3HNO₃ ----> Al(NO₃)₃ + 3H₂O is the balanced reaction.

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The electron donor is [tex]H_2[/tex].

The electron acceptor is [tex]NAD^+[/tex]

When the electron donor loses the electron, it becomes oxidized.

When the electron acceptor accepts the electron, it becomes reduced.

Overall, the electron travels from H to  [tex]NAD^+[/tex].

Oxidation is defined as:

Reduction is defined as:

Looking at the reaction, [tex]NAD^+[/tex] gained hydrogen or an electron to become NADH. this means that NADH has been reduced. The reducing agent or the electron donor is [tex]H_2[/tex] .

Thus, the electron acceptor is [tex]NAD^+[/tex]. When the electron donor, [tex]H_2[/tex], loses the electron, it becomes oxidized to [tex]H^+[/tex].

When the electron acceptor, [tex]NAD^+[/tex], accepts the electron, it becomes NADH.

This means that electron travels from  [tex]H_2[/tex] to [tex]NAD^+[/tex]

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Answer: Molarity  (M) = 6.897 x 10-4 (exponent)

Explanation:  Atomic weight of KI is 166.028

12.6 mg = 0.126g/ 166.028 =  7.58 x 10-5 mol

Molarity (M) = concentration

M = moles(n)/Volume (in liters)

M= 7.58 x 10-5 mol/0.1099L = .0006897 M = 6.897 x 10-4 (exponent)

1) If the temperature of the system increases, the equilibrium constant k decreases.

2) the concentration of H₂ increases.

The reaction is given as :

CO +  2H₂   ⇄  CH₃OH                          ΔH = -91.8 KJ ( exothermic reaction)

1) Temperature is the only factor that changes the equilibrium constant for the given reaction. As temperature increases equilibrium constant decreases because the reaction is exothermic reaction.

                K = [ CH₃OH ] / [CO] [H₂]²

2) If the temperature increases the position of equilibrium moves to the left and concentration of H₂ increases.

Thus, 1) If the temperature of the system increases, the equilibrium constant k decreases.

2) the concentration of H₂ increases.

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The formula for Ag ^+ and Na2S is,

Net Ionic Equation

2Ag + Na2S = Ag2S + 2Na might be an ionic equation.

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Once started, nuclear fission reactions are able to continue to occur on their own because a neutron begins the reaction, and more neutrons are formed in it; option D

Nuclear fission is a type of nuclear reaction in which the nucleus of atoms of large molecular mass is split into two or more smaller atomic nuclei.

Nuclear fission reactions result in the release of large amounts of heat energy and radiation.

Nuclear fission reactions once started, are able to go on occurring on their own until all fissionable material is used up. This is known as a chain reaction.

A chain reaction in nuclear fission occurs because when the atomic nucleus of the large atom is bombarded with fast-moving neutrons, the neutrons that are captured by the nucleus of the large atom results in the fission of the atom and the release of more neutrons that initiate more fission reactions.

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The enthalpy of the reaction is obtained as 242 kJ/mol

We define the term enthalpy as the heat that is evolved or absorbed in a chemical process. In this case, heat is evolved when the reaction occurs because a neutralization reaction is necessarily an exothermic reaction. This is because het is given off.

We have been supplied with the amount of that is produced in the process. Hence we have;

Number of moles of sodium metal = 0.442g /23 g/mol = 0.019 moles

Thus, we have the enthalpy as;

H = 4590 * 10^-3 kJ/0.019 moles

= 242 kJ/mol

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In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge.  The correct option is option C

Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided.

As it is given that lithium atom is neutral for this number of proton has to be equal to number of electron. The  proton number is 3 that means number of electron is also 3 because proton number  is equal to number of electron and this equals to atomic number.

Therefore there are three electrons in Lithium if it has three proton. The correct option is option C

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In certain fireworks, potassium nitrate breaks down into potassium oxide, nitrogen, and oxygen. This is an example of a combustion reaction. The opposite process is a synthesis reaction

fireworks are a class of low explosive devices used for aesthetic and entertainment purposes

Here potassium nitrate is break down into the potassium oxide and nitrogen and oxygen which decomposes is by given burning it is also combustion reaction and the synthesis reaction is opposite to this reaction

2KNO₃ → 2KNO₂ + O₂

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Answer: Fe(aq) + S(aq)   yields FeS(s)

Explanation:

Fe+2 + 2Cl-  + 2K+ + S-2  yields  FeS(S) + 2K+ + 2Cl-

Cross out the aqueous ions and you are left with

Fe+2 + S-2  yields  FeS(s).  

Assuming you can't wish for infinite wishes:

1. Hyperintelligence

2. Elite athleticism (within the confines of human limitations of course. So just being a 99th percentile athlete)

3. The ability to summon a delicious steak of any variety at any level of doneness at any moments notice

Answer:

Explanation:

Coal is a cheap and abundant resource, and carbon dioxide (CO2) from coal use is responsible for about 40 percent of global greenhouse gas (GHG) emissions from fossil fuel use.

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The empirical formula of an organic compound with 24.24% carbon. 4.04% hydrogen, and 71.71% chlorine will be  [tex]CHCl_2[/tex].

If the molar mass of the compound is 148.5, the molecular formula will be  [tex]C_2H_2Cl_4[/tex].

The compound contains:

The mole of each atom can be found by dividing them by their respective molecular weights.

Now, let's divide through by the smallest number of moles

Thus, the empirical formula of the compound is [tex]CHCl_2[/tex].

The molar mass of the empirical formula is calculated as:

12 + 1 + (35.5 x2) = 84 g/mol

Molecular formula = [empirical formula]n

Where n = Molecular formula mass/empirical formula mass

In this case, n = 148.5/84

                       = 1.77 (approximatel 2)

Thus, the molecular formula of the compound is [tex]C_2H_2Cl_4[/tex].

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Answer:

Both methane and nitrous oxide are more effective greenhouse gases than carbon dioxide.

Explanation:

Not really sure what the problem is, the answer is given in the question.

The question asks "Which compares the effectiveness of methane and nitrous oxide as a greenhouse gas with that of carbon dioxide. Both methane and nitrous oxide are more effective greenhouse gases than carbon dioxide."

The first part of the question is "Which compares the effectiveness of methane and nitrous oxide as a greenhouse gas with that of carbon dioxide."

The second part of the question is literally the answer, "Both methane and nitrous oxide are more effective greenhouse gases than carbon dioxide."

it could be that you just accidentally pasted the same thing twice, and the original question was just "Which compares the effectiveness of methane and nitrous oxide as a greenhouse gas with that of carbon dioxide."
In that case, remember that the order of greenhouse gas potency is Carbon dioxide, methane, nitrous oxides, chlorofluorocarbons. Thus, nitrous oxide and methane are both more potent than carbon dioxide.

Asteroids are left over pieces of rocks that didn't become planets or satellites. These are mostly located in The Asteroid Belt in the Solar System.

The main asteroid belt is a region between the orbits of Mars and Jupiter. The Asteroid Belt is a torus shaped region. Some of the asteroids may go in the front or behind the Jupiter.

The Oort cloud has around 2.3% of left over pieces of asteroid rocks. It is a predicted percentage.The asteroids were located in more amount earlier when the interplanetary zones were clearing in the solar system.

The Kuiper Belt has bits of rocks, comets, ice, and the dwarf planets. It is similar to the asteroid belt but it is more complex and larger.

Asteroids are discovered by a systematic search for a planet between Mars and Jupiter in the asteroid belt.

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The number of photons is obtained from the calculation as 1.68 * 10^19 photons.

By definition, we know that energy is the ability to do work. Now we know that we have the wavelength of the radiation can be seen from the question and the values that are given to be 3.80 x 10-8 m.

Then energy = hc/λ

h = Plank's constant

c = speed of light

λ = wavelength

E = 6.6 * 10^-34 * 3 * 10^8/ 3.80 x 10^-8

E = 5.2 * 10^-18 J

Energy of the water = mcdT

= 4.48 * 4.2 * 4.65 = 87.5 J

Number of photons required =  87.5 J/5.2 * 10^-18 J

= 1.68 * 10^19 photons

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