whats the phycical property of water

Answer:

Option A

Explanation:

Because B, C, D, or E are impossible, protons cannot change, electron = protons.

The final temperature must be 273 K or 0 °C to reduce the volume to  3.62 L.

Let's solve the problem by using Charles Law which states that at constant temperature and pressure, the quotient of the volume and the temperature will always have the same value.

Now , mathematically, we can write as

[tex]\frac{V}{T}[/tex]  = K

For initial and final states, the above equation can be written as

[tex]\frac{V1}{T1}[/tex]  = [tex]\frac{V2}{T2}[/tex]

Since, we are given

V1 = 4.39 L

T1 = 44  °C = 317 K (being O°C = 273 K)

V2 = 3.78 L

T2 = ?

Substituting the abovementioned values in Charles's law we get:

[tex]\frac{4.39L}{317K}[/tex]  = [tex]\frac{3.78L}{T2}[/tex]

Now solving the above equation.

[tex]T_{2}[/tex]  x  [tex]\frac{4.39L}{317k}[/tex]  = 3.78L

[tex]T_{2}[/tex] = 3.78L ÷ [tex]\frac{4.39L}{317K}[/tex]

[tex]T_{2}[/tex]  = 273K i.e. 0°C

Hence, the final temperature must be 273 K or 0 °C to reduce the volume to 3.62 L.

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Answer:

C. Lead(IV) Chloride

Explanation:

Because PbCl4 has a transition metal we need to indicate the ionic charge using Roman numerals in parenthesis. This is placed directly after the metal.

The name of PbCl₄ is lead (IV) chloride. Therefore, option C is correct.

Lead (IV) chloride (PbCl₄) is a hypothetical compound, it does not exist under normal conditions. The highest oxidation state that lead typically exhibits is +4, but it is highly unstable and tends to be disproportionate to lower oxidation states.

Lead commonly forms compounds such as lead (II) chloride (PbCl₂), where lead has an oxidation state of +2. In PbCl₂, each lead atom is bonded to two chloride ions. This is the most stable and commonly observed form of lead chloride.

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Boyle’s law is supported by the following options - (a) product of pressure and volume is constant, (c) decrease in volume leads to increase in pressure, and (d) decrease in pressure leads to increase in volume.

Boyle's law, an experimental gas law, states that as a container's capacity rises, a gas's pressure tends to drop.

According to Boyle's law, in a closed system with constant temperature and gas volume, the absolute pressure a given mass of an ideal gas exerts is inversely proportional to the volume it occupies.

According to this, the volume of a gas is inversely proportional to the pressure it exerts at a given temperature. In other words, a gas will condense to fit into an enclosed area when it is poured into it, but the pressure it exerts on the container will rise.

Therefore, (a) the product of the pressure and volume of a gas is constant, (c) The pressure will increase with a decrease in the volume of the gas, and (d) the pressure decreases with an increase in the volume of the gas.

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Reaction between 0.050g Magnesium and HCl in excess gives the following results.

Magnesium interacts with hydrochloric acid (HCl), and this presentation may be used to show a single replacement reaction, the typical interaction of metals with acid, or the production of hydrogen gas.

A eudiometer is a laboratory tool used to gauge how much a gas mixture expands or contracts after undergoing a physical or chemical change.

Magnesium is a shiny gray solid whereas HCl is a colourless aqueous solution with a pungent odour. On a reaction between these two, single displacement of Cl from HCl to [tex]MgCl_2[/tex] occurs.

Given:

Mass of Mg = 0.050g

Molar mass of Mg = 24g/mol

Calculations:

(a) No. of moles of Mg = 0.050 / 24 = 0.0021 moles of Mg reacted

(b) [tex]Mg (s) + 2HCl (l) \rightarrow MgCl_2 (s) + H_2 (g)[/tex]

As moles of Mg reacted = moles of [tex]H_2[/tex] produced

Therefore, No. of moles of [tex]H_2[/tex] produced = 0.0021 moles

(c) Vapour pressure of water at 20℃ is 17.5 torr = 0.023atm

Pressure of only [tex]H_2[/tex] gas = 1 – 0.023 = 0.977atm

(d) Using P1V1/T1 = P2V2/T2,

0.977 x 48.6 / 293 = 1 x V2 / 273

Volume of [tex]H_2[/tex] gas at STP = 44.24mL

(e) Molar volume of [tex]H_2[/tex] gas at STP = 44.24 / 0.0021 = 21.067L/mol

(f) Percent error = 22.4 – 21.067 / 22.4 x 100 = 5.95%

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The reaction between a sample containing chloride ions with excess Lead (II) nitrate leads to the formation of [tex]PbCl_2[/tex] in the form of precipitate.

a) The precipitate formed in the reaction of excess Lead (II) nitrate and chloride ions is [tex]PbCl_2[/tex].

Total ionic is [tex]2Cl^- + Pb(NO_3)_2 \rightarrow PbCl_2 (ppt) + 2NO_3^-[/tex]

Net ionic is [tex]2Cl^- + Pb^+ \rightarrow PbCl_2 (ppt)[/tex]

b) Excess Lead (II) nitrate was used in the reaction to precipitate each and every chloride ion.

c) The total mass of [tex]PbCl_2[/tex] = 2.686 - 0.923 = 1.763g

Molar mass of [tex]PbCl_2[/tex] = 278g/mol

Therefore, moles of [tex]PbCl_2[/tex] = 1.763/278 = 6.342 x [tex]10^{-3}[/tex]

d) No. of moles of chloride = 2 x moles of [tex]PbCl_2[/tex] = 12.684 x [tex]10^{-3}[/tex]

Mass of chloride = 35.5 x 12.684 x [tex]10^{-3}[/tex]

Mass of chloride = 0.45g

e) % of chloride = 0.45/0.897 x 100 = 50.2%.

f) No, the mass of the sample is not same as the mass of the precipitate formed during the reaction.

The complete question is:

A 0.897g sample containing chloride ion is treated with excess lead (II) nitrate. The lead (II) chloride precipitated is filtered into a filter paper that weighed 0.923g. After washing and drying the precipitate+ filter paper weighed 2.686g. Calculate the following:

a) Write the total ionic and net ionic equation for the reaction producing the precipitate:

total ionic:

net ionic:

b) Why was excess lead (II) nitrate used in the above procedure?

c) moles of lead (II) chloride formed:_______

d) Moles of chloride present in the sample__________ and Mass of chloride present in the sample _________

e) % of chloride in the sample: ___________

f) Is the mass of the sample same as the mass of precipitate? _________

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The concentration of the given solutions based on the titration is given below:

1. concentration of NaOH is 1.6 mol/dm³

2. concentration of NaOH is 0.8 mol/dm³

3. concentration of NaOH is 2.4 mol/dm³

4. concentration of KOH is 1.0 mol/dm³

A titration reaction is a reaction in which a solution of known concentration and volume is reacted with a given volume of a solution of unknown concentration in order to determine the unknown concentration of the second solution.

1. Volume of H₂SO₄ =  20 cm³

The concentration of H₂SO₄= 1.0 mol/dm³

Volume of NaOH reacted =  25 cm³

Mole ratio of NaOH and  H₂SO₄ = 2 : 1

The concentration of NaOH = 20 * 1.0 * 2/25

The concentration of NaOH = 1.6 mol/dm³

2.  Volume of HNO₃ =  20 cm³

The concentration of HNO₃= 1.0 mol/dm³

Volume of NaOH reacted =  25 cm³

Mole ratio of NaOH and  HNO₃ = 1 : 1

The concentration of NaOH = 20 * 1.0 / 25

The concentration of NaOH = 0.8 mol/dm³

3.  Volume of H₃PO₄ =  20 cm³

The concentration of H₃PO₄ =  1.0 mol/dm³

Volume of NaOH reacted =  25 cm³

Mole ratio of NaOH and  H₃PO₄ = 3 : 1

The concentration of NaOH = 20 * 1.0 * 3 / 25

The concentration of NaOH = 2.4 mol/dm³

4. Volume of H₂SO₄ =  25 cm³

The concentration of H₂SO₄= 0.5 mol/dm³

Volume of KOH reacted =  25 cm³

Mole ratio of KOH and  H₂SO₄ = 2 : 1

The concentration of KOH = 25 * 0.5 * 2 / 25

The concentration of KOH = 1.0 mol/dm³

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At volume 6.78ml, pH will be equal to pKa of the acid.

According to the Henderson- Hasselbach equation,

pH= pKa + log {A-}/ {HA}

where {A-} is the concentration of conjugate base and

{HA} is the concentration of weak acid

At the equivalence point, the volume of base added is just enough to exactly neutralize all the acid.

At one half of this volume of added base, called the half equivalence point, enough has been added to neutralize half of the acid. Since, half of the acid reacted to form A-, the concentration of A- and HA-, at the half equivalence point are the same.

ph= PKA+log1

pH= pKa (log1=0)

Therefore, V eq = 13.57ml

V 1/2 eq= 13.57/2

=6.78ml

Hence, at volume 6.78ml, pH will be equal to pKa of the acid.

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This process happens in such a way that total mechanical energy, equal to the sum of the kinetic and potential energies, is conserved.

Potential and kinetic energy are sources from which mechanical energy is generated by converting them into power. Turbines that are powered by steam, water, wind, gas, or liquid fuels are a few examples of this. Before being employed as power, machines are frequently used to convert various sources of energy.

As long as there is no energy loss via friction, the system's mechanical energy remains constant. When the speed increases, the energy would become kinetic energy. As long as there is no energy loss via friction, the system's mechanical energy grows.

When an immovable item starts moving, mechanical energy is converted into kinetic energy.

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The net force of the car speeding with of 5000N of force is 4100N force and it is not even near to be balanced.

The net force is the total of all the forces acting on an object, according to its definition. Mass can be accelerated by net force. Whether a body is at rest or in motion, another force is at work on it. When a system has a lot of forces acting on it, the phrase "net force" is used.

We have given,

Applied force Fa = 5000N

Frictional force Ff = -400N

Force exerted back by zombie Fz = -500N

The net force formula is given by

[tex]F_{Net}[/tex] = F₁ + F₂ + F₃

[tex]F_{Net}[/tex] = 5000 - 400 - 500

[tex]F_{Net}[/tex] = 4100N

Therefore, The net force of the car speeding with of 5000N of force is 4100N force and it is not even near to be balanced.

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Zircon and detrital quartz have the potential to provide information regarding scalar changes to the Earth's weathering processes and silicon isotope composition. Due to the fact that there are currently few data on the Si isotope equilibrium fractionation of minerals, determining the source melt Si isotope composition from out-of-context minerals is difficult.

The term "quartz" comes from the Polish words "kwardy" and "twardy," both of which imply "hard" in English. Quartz is an igneous rock made up of silicon and oxygen atoms in a continuous structure called silicon-oxygen tetrahedra (SiO4). The ultimate chemical formula of quartz is SiO2, which is recognized in science as the result of the sharing of each oxygen atom between two tetrahedra atoms. In terms of mineral abundance in the continental crust of the earth, quartz is second only to feldspar. The two types of quartz which are known as regular alpha quartz and high-temperature beta quartz are both chiral materials. All of the alpha-to-beta quartz transformations take place at temperatures below 573 degrees Celsius.

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Answer:

The temperature is 336.9K.

Explanation:

To calculate the temperature of CO2, it is necessary to replace the values of CO2 molar mass (0.044kg/mol), gas constant (R=8.314J/mol.K) and in this case the root mean square velocity (4.37x10^2m/s) in the root mean square velocity formula:

So, the temperature is 336.9K.

a) CH2O

The carbon atoms are present in sp2 hybridization

b) CH2=CH-CH=CH2

All carbon atoms are present in sp2 hybridization

c) CH2=C=C=CH2

The 2,3-carbons are in sp hybridization and the remaining carbons are in sp2 hybridization.

The idea of combining two atomic orbitals to create a new class of hybridized orbitals is known as hybridization in chemistry. This mixing typically produces hybrid orbitals with completely distinct energies, geometries, etc. Hybridization primarily involves atomic orbitals at the same energy level. However, if an orbital has equivalent energy, it can participate in this process, as can an orbital that is partially filled.

On the other side, we may claim that the idea of hybridization is an expansion of the valence bond theory and that it aids in our understanding of how bonds are formed, how they are energetically, and how long they are.

When two atomic orbitals in a molecule combine to generate a hybrid orbital, the energy of the orbitals of the individual atoms is redistributed to give orbitals of equivalent energy. Hybridization is the name of this procedure.

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The mass of the cart needs to accelerate at 0.75 m/s² is 166.6kg.

The net force on an object is zero but its velocity and direction of motion remain unchanged. The net force is the sum of all horizontal or vertical forces. When the box is not moving, the friction plus the applied force is zero, so the net force is zero. The answer is zero. An object moving at constant velocity has zero acceleration, so the net force is zero.

Newton's second law of motion can be observed by comparing the acceleration of a car and a truck after the same force is applied. It's easy to see that the car accelerates faster than the truck after pushing the car and the truck with equal force. Friction is the force that resists movement between contact surfaces. Friction works in our favor and against us.

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Milk : Homogenous

glass : Homogenous

sugar : compounds

bottled spring water  : Homogenous

distilled water : compounds

air  : Homogenous

alloy bicycle frame  : Homogenous

propane : compounds

baking soda  : Homogenous

When two liquids totally mix, they produce a homogenous combination.

Complete dissolution of a solid in a liquid

When there is no phase difference in a combination, it is said to be homogenous. The composition of a homogeneous mixture is constant and consistent across the whole system.

A mixture of water and ethanol, for instance, is an example of a homogeneous mixture since the two substances are miscible in all amounts.

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Answer:

3Mg + Mn2O3 --> 3MgO + 2Mn

Explanation:

To know whether an equation is balanced, make sure to count how many atoms of a specific element are in each side.

In these options, the only one that has the same amount on each side is option 2.

On the reactant side, we have:

3 Mg,  2 Mn,  and 3 O

On the product side, we have:

3 Mg,  2 Mn,  and 3 O

If you have a coefficient in front of the molecule, that means that there is that amount of each element. For example 3 MgO, there is 3 Mg and 3 O.

If you have a subscript (the small number) after the element, that means there is specifically that amount of atoms of that element. For example Mn2O3, there is specifically 2 Mn and 3 O.

Answer:We need to separate different components of a mixture to separate the useful components from the non-useful or some harmful components. Examples: (a) Tea leaves are separated from tea.

The particles are allowed to settle out at the bottom before the water is passed through to separate the particles of the higher density and recovered from the bottom.

Sedimentation is the tendency for the particles to settle out of the fluid content. Then they come to rest against a specific barrier due to their own motion which is in the response to all the forces that are acting on them.

Sedimentation can be described as the opposite process of erosion which is the terminal end where the sediment is transported. Sedimentation allows the particles with different densities which are in the suspended form in water to settle under the gravitational force.

The settled particles from the suspension become sediment, while water treatment is called sludge. When this thick sediment continues to settle, which is assisted by mechanical means is called the process of thickening.

Then you can easily remove the sediment by using a filtration system that contains a water sediment filter.

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The single spot, with an Rf value of 0.95. observed by the student indicates that his reaction mixture contains only one compound.

The purity of the sample can be verified by checking the single spot using a UV-light.

Thin-layer chromatography is a form of chromatography in which a thin layer serves as the solid support over which the differet components in the dye are separated.

The Rf value or the retention factor (Rf) is a value used to compare and help identify compounds in a mixture of compounds or dyes separated by thin-layer chromatography.

Mathematically, the Fr value of a compound is calculated as follows:

Rf value = distance traveled by the compound / distance traveled by the solvent front.

A single Rf value indicates a single compound was present.

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Answer

Mg(OH)2 is the limiting reactant

Mass of MgCl2 produced = 3.02 g

Explanation

Given: The balanced chemical equation

mass of Mg(OH)2 = 1.85 g

mass of HCl = 3.71

Solution

Mg(OH)2

HCl

Therefore Mg(OH)2 is the limiting reactant.

Calculation of MgCl2 mass

The balanced chemical equation for Na₃PO₄ and FeCl₂:

2 Na₃PO₄ (aq)  + 3 FeCl₂ (aq)   →  Fe₃(PO₄)₂ (s) +  6NaCl (aq)

The net ionic equation of HNO₃ and LiOH:

H⁺(aq)  + OH⁻(aq) →  H₂O (l)

The net ionic equation is an equation of a chemical reaction that expresses only elements,  ions, or compounds, that directly participated in that chemical reaction.

We can write a balanced  chemical equation for Na₃PO₄ and FeCl₂:

2 Na₃PO₄ (aq)  + 3 FeCl₂ (aq)   →  Fe₃(PO₄)₂ (s) +  6NaCl (aq)

The complete ionic equation can be written for reaction of Na₃PO₄ and FeCl₂:

6Na⁺ (aq) + 2PO₄³⁻ (aq)  +  3 Fe³⁺ (aq) + 6Cl⁻ (aq)  → Fe₃(PO₄)₂ (s) +  6 Na⁺ (aq) +  6Cl⁻ (aq)

The balanced chemical equation for  HNO₃ and LiOH:

HNO₃ (aq)  + LiOH (aq)  →  H₂O (l)  +  LiNO₃ (aq)

The complete ionic equation for HNO₃ and LiOH::

H⁺(aq)  + NO₃⁻ (aq)  +  Li⁺(aq)  +  OH⁻ (aq)   →  H₂O (l) +  Li⁺(aq) + NO₃⁻ (aq)

The net ionic equation of HNO₃ and LiOH:

H⁺(aq)  + OH⁻(aq) →  H₂O (l)

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Answer:

There are billions of galaxies in the universe, not just one.

The universe formed from a central point.

Most galaxies in the universe are moving away from Earth.

Explanation:

Thus mass of dye A = 10.24 mg/L

Plot Beer-Lambert law

Beer-Lambert law states that absorbance of an analye (here, dye A) is directly proportional to its concentration (C) and pathlength (l) of the solution

i.e. A \propto  C*l

or A = \epsilonCl

where \epsilon = proportionality constant and is called absorptivity coefficient. It is characteristic for an analyte at a given wavelength, unit = M-1cm-1

Thus above equation can be compared with a straight line equation as y = mx+c

where y = absorbance, x = concentration and \epsilon = slope, c = intercept = 0 for absorbance vs concentration plot.

b. Calculate the slope (m) of graph:

for absorbance vs concentration plot.

The given data was plotted and fitted to a liner fit that gave the equation as:

y = 27335 x

slope of the line = 27335

thus \epsilon = 27335 M-1cm-1

c. Concnetration using Beer-Lambert plot:

Absorbance of dye A in Sports drink, A = 0.700

point absorbance of 0.007 on y-axis and interpolate to the linear fit. Check the corresponding value at x-axis as follows:

the corresponding line meets x-axis at 0.00002 + 4-squares

In the graph drawn, 7 squares in x-axis = 0.00001

thus 4 squares on x-axis = 0.00001*4/7 = 5.71*10-6

thus for y = 0.700 the corresponding x-axis reads = 0.00002+5.71*10-6

or C = 2.57*10-5 M

d. Concnetration of dye A using slope of fitted line:

Absorbance of dye A in Sports drink, A = 0.700

substituting the absorbance in the linear fit equation we can calulate the concentration as:

0.700 = 27335*C

C = 0.700/27335

C = 2.56*10-5 M

e. Mass of dye A in mg/L

Molar mass of dye = 400 g/mol

Concentration (molarity) of dye A = 2.56*10-5 M

1 M = number of moles of solute present in 1 L of solution volume

number of moles = mass / molar mass

\therefore  Molarity = mass of solute/(molar mass of solute*volume of solution)

for solution volume = 1L

Molarity = mass of solute/molar mass of solute

rearranging this we get:

mass of solute = (Molarity*molar mass of solute) g/L

mass of dye A = 2.56*10-5* 400 g/L

m = 0.01024 g/L

1 g = 1000 mg

Thus mass of dye A = 10.24 mg/L

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The main points of Dalton's atomic theory is Atoms are not indivisible and all atoms of an element are not identical.

Atoms are the minuscule, indivisible building blocks of all stuff.

A certain element's atoms are all the same mass, size, and other characteristics. Nevertheless, the characteristics and mass of atoms from various elements varies.

Atoms are eternal and cannot be generated or destroyed. Atoms also can not be separated into smaller particles.

Compounds can be created by combining atoms of various elements in specific whole-number ratios.

In chemical reactions, atoms can be joined, separated, or rearranged.

The fact that an atom may be further divided into protons, neutrons, and electrons disproves the idea that it is indivisible. The smallest particle that participates in chemical processes is an atom, nevertheless. Dalton asserts that the atoms of the same element are identical in every way.

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The correct answer is No, at least one segment length is not preserved, making this a nonrigid transformation.

A rigid transformation of the plane, also known as an isometry, keeps length intact.

"Rigid transformations" include reflections, translations, rotations, and combinations of these three transformations.

A rigid transformation implies that neither the shape nor the size is altered.

Because the length of segment JK (2 units) is not preserved when mapped onto J'K', the second answer is correct, which gives the resulting unit 5 units.

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Answer: B

Explanation: No, at least one segment length is not preserved, making this a nonrigid transformation

The difference between drying the organic layer and solvent evaporation is explained below.

When an organic component is extracted, there is always the possibility of traces of water or moisture remaining in the organic layer. To eliminate water from the organic layer, the organic layer is frequently treated with sodium sulfate, a process known as drying the organic layer. The organic layer is concentrated once it has been freed of water by evaporating the organic solvent. There is always some water remaining in the organic layer after aqueous extractions. Adding anhydrous sodium sulfate for drying the organic layer, eliminates this water by creating sodium sulfate hydrate, which is likewise a solid and so easily filtered away.

Solvent evaporation is the process of emulsifying polymer in aqueous phase and dispersing it in a volatile solvent such as dichloromethane, chloroform, or ethyl acetate. The solvent is then evaporated using high heat, vacuum, or continuous stirring. By placing the solution in an open container, solvent evaporation occurs (an Erlenmeyer, evaporating dish, beaker, vial). The solvent is boiled out by placing the container on a heat source (steam bath, hot plate, heating mantle, sand bath).

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8 trees would be saved from a stack of newspapers 24 feet high if The number of trees saved by recycling is directly proportional to the height of a stack of recyclable newspapers.

Equivalence between two ratios is referred to as proportionality in algebra. A and B are in the same proportion as C and D in the expression a/b = c/d.

When one of a proportion's four quantities is unknown, a proportion is typically used to solve a word problem. It is resolved by multiplying one numerator by the opposing denominator and equating the result to that of the other numerator and denominator.

Stack of recyclable newspaper 36 inches high will save one tree;

Let the stack of recyclable newspaper = s = 36

Number of trees = n = 1

We have given that

s α n

Which means

s = kn

where k is constant

k = s/n

  = 36/1

  = 36 inches

We know that 24 feet = 288 inches, So

n = s/k

n = 288 inches/36 inches

n = 8 trees

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When a compound's qualities cannot be fully explained by a single structure, we require more structures. These additional structures are known as resonance structures, and the phenomenon they describe is known as resonance.

Resonance is the term used to describe the phenomena of enhanced amplitude that happens when the frequency of a periodic force is applied (or a Fourier component of it) is equal to or nearly equal to the natural frequency of the system on which it works. In contrast to when the same oscillating force is applied at other, non-resonant frequencies, a dynamic system will oscillate at a higher amplitude when the oscillating force is applied at its resonant frequency.

Resonant frequencies or resonance frequencies of the system are frequencies at which the response amplitude is a relative maximum. Small periodic forces that are close to a resonant frequency of the system can produce large amplitude oscillations in the system due to the storage of vibrational energy.

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The radiant energy that is absorbed by the plant in the process of photosynthesis is stored in the plant in the form of chemical energy contained in sugars.

The term photosynthesis has to do with the process by which there is a combination of water and carbon dioxide in the plant such that the products that are formed are sugar and oxygen. The oxygen is released back into the environment.

We know that radiant energy from the sun is what acts as the catalyst that makes the reaction possible. The combination occurs in the chloroplasts of the plant cells .

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