why is zinc more electropositive than iron?​

Given that the x-intercepts of the parabola are -5 and 5 and we need to find out which equation from the given options is that of the parabola.  Option (b) y = (x + 5)(x - 5)

is the equation of a parabola with x-intercepts -5 and +5 in the standard (x, y) coordinate plane.

We know that the x-intercepts of a parabola are the points at which y is zero.

We have two x-intercepts: x = -5 and x = 5. Let's find which equation is correct.

a. y = x² + 25

For x = -5, we have

y = (-5)² + 25 = 50.

It does not satisfy the equation for the x-intercept of -5.

For x = 5, we have

y = (5)² + 25 = 50.

It does not satisfy the equation for the x-intercept of 5.

b. y = (x + 5)(x - 5)

For x = -5, we have

y = (0) (10) = 0.

This satisfies the equation for the x-intercept of -5.

For x = 5, we have

y = (10) (0) = 0.

This satisfies the equation for the x-intercept of 5.

c. y = x(x + 5)(x - 5)

For x = -5, we have

y = (-5) (0) (10) = 0.

This satisfies the equation for the x-intercept of -5.For x = 5, we have

y = (5) (10) (0) = 0.

This satisfies the equation for the x-intercept of 5.

d. y = (x + 5)² - 25

For x = -5, we have

y = (0) - 25 = -25.

It does not satisfy the equation for the x-intercept of -5.

For x = 5, we have

y = (10) - 25 = -15.

It does not satisfy the equation for the x-intercept of 5.

y = (x + 5)(x - 5)

is the equation of a parabola with x-intercepts -5 and +5 in the standard (x, y) coordinate plane.

Hence, the correct answer is option B.

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Answer: I got 15.56

Explanation: I am so sorry if that's wrong but I used the equation Q=m×c×ΔT where

m=mass

ΔT= temp change that occurs

c= specific heat capacity

good luck, again sorry if i totally biffed that

Answer:

2

Explanation:

1 grams F2 to mol = 0.02632 mol

10 grams F2 to mol = 0.26318 mol

20 grams F2 to mol = 0.52636 mol

30 grams F2 to mol = 0.78954 mol

40 grams F2 to mol = 1.05272 mol

50 grams F2 to mol = 1.3159 mol

100 grams F2 to mol = 2.6318 mol

200 grams F2 to mol = 5.2636 mol

Answer:1 Answer. A chemical equation is balanced when the number of each kind of atom is the same on both sides of the reaction,,

Answer:

If each side of the equation has the same number of atoms of a given element, that element is balanced. If all elements are balanced, the equation is balanced.

The ratio of the volumes of the two similar solids, expressed in the lowest terms, is 216:343.

To find the ratio of the volumes of two similar solids with a scale factor of 6:7, we can use the fact that the ratio of the volumes of similar solids is equal to the cube of the scale factor.

The ratio of the volumes of the two similar solids can be expressed as (6/7)³.

To simplify this ratio to its lowest terms, we can cube the numerator and denominator separately.

(6/7)³ = (6³)/(7³) = 216/343

Therefore, the ratio of the volumes of the two similar solids, expressed in lowest terms, is 216:343.

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Helium, hydrogen, and chlorine are obtained from sources other than the atmosphere. The gases primarily obtained from the atmosphere are nitrogen, oxygen, and argon.

Nitrogen, oxygen, and argon are the main components of Earth's atmosphere and are commonly obtained from the air. They exist in significant quantities in the atmosphere and are often extracted for various industrial and commercial purposes.

On the other hand, helium, hydrogen, and chlorine are not primarily obtained from the atmosphere. Helium is typically extracted from natural gas wells, hydrogen is usually produced from fossil fuels or electrolysis of water, and chlorine is obtained through chemical processes such as electrolysis or from chloride-containing compounds.

The gases primarily obtained from the atmosphere are nitrogen, oxygen, and argon. Helium, hydrogen, and chlorine are obtained from sources other than the atmosphere.

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Answer:

I think its B im not sure

but i hope this helps

Most inorganic substances do not burn because they do to contain carbon. Organic substances do contain carbon.

The net ionic equation for the mixing of sodium iodide and lead(II) nitrate is:

Pb2+ (aq) + 2I- (aq) → PbI2 (s)

The net ionic equation for the mixing of sodium iodide (NaI) and lead(II) nitrate (Pb(NO3)2) can be determined by examining the dissociation of the compounds and identifying the ions involved in the reaction. Here's the breakdown of the reaction:

Sodium iodide (NaI) dissociates in water to form sodium ions (Na+) and iodide ions (I-):

NaI (aq) → Na+ (aq) + I- (aq)

Lead(II) nitrate (Pb(NO3)2) dissociates in water to form lead(II) ions (Pb2+) and nitrate ions (NO3-):

Pb(NO3)2 (aq) → Pb2+ (aq) + 2NO3- (aq)

When these two solutions are mixed, a double displacement reaction occurs, leading to the formation of a precipitate. The iodide ions (I-) from sodium iodide react with the lead(II) ions (Pb2+) from lead(II) nitrate to form solid lead(II) iodide (PbI2):

2Na+ (aq) + Pb2+ (aq) + 2I- (aq) + 2NO3- (aq) → PbI2 (s) + 2Na+ (aq) + 2NO3- (aq)

The net ionic equation is obtained by removing the spectator ions, which do not participate in the reaction. In this case, the spectator ions are the sodium ions (Na+) and nitrate ions (NO3-):

Pb2+ (aq) + 2I- (aq) → PbI2 (s)

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Answer:

probably A that's my best guess

Answer:

Hello There!!

Explanation:

The answer is A.H20.This is water which isn't an ionic compound.

hope this helps,have a great day!!

~Pinky~

Answer: 2 moles

Explanation:

The probability that a single carbon-14 (14C) isotope nucleus will decay in a given time period can be calculated using the concept of half-life. The half-life of carbon-14 is 5370 years, which means that after this time period, half of the initial amount of carbon-14 will have decayed into nitrogen-14.

To determine the likelihood of decay for a single 14C nucleus in the next 5370 years, we can say that there is a 50% chance of decay. This is because the half-life is the time it takes for half of the nuclei to decay, so after one half-life, there is a 50% chance that an individual nucleus will have decayed. For the next 200 years, we need to calculate the number of half-lives that occur in that time period. Since each half-life is 5370 years, we can divide 200 by 5370 to find the number of half-lives. The result is approximately 0.037, meaning that less than one-half-life has passed. Therefore, the likelihood of decay for a single 14C nucleus in the next 200 years is low. It is less than 50% because less than one-half-life has passed. However, it is important to note that the decay of an individual nucleus is a random process, and while we can make predictions based on probabilities, it is not possible to determine with certainty whether a specific nucleus will decay within a given time frame.

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The solubility of silver carbonate in water is approximately 1.26 × 10⁻³ mol/L. The solubility of silver carbonate in 0.22 M AgClO₃ is approximately 2.92 × 10⁻⁵ mol/L. The solubility of silver carbonate in 0.41 M Na₂CO₃ is approximately 1.20 × 10⁻⁶ mol/L.

To calculate the solubility of silver carbonate (Ag₂CO₃) in different solutions, we need to compare the solubility product (Ksp) with the concentrations of relevant ions in the solution. The balanced equation for the dissociation of silver carbonate is:

Ag₂CO₃(s) ⇌ 2Ag⁺(aq) + CO₃²⁻(aq)

(a) Solubility in water:

Since water does not contain any common ions, the concentration of Ag⁺ and CO₃²⁻ ions in water is initially zero. Therefore, we assume x as the solubility of Ag₂CO₃ in mol/L.

The equilibrium concentrations of Ag⁺ and CO₃²⁻ ions are both 2x (as the stoichiometric ratio is 1:1).

The Ksp expression is:

Ksp = [Ag⁺]²[CO₃²⁻] = (2x)²(2x) = 8x⁵

Since the Ksp is given as 8.1 × 10⁻¹², we can set up the equation:

8x⁵ = 8.1 × 10⁻¹²

Solving for x, we find:

x = (8.1 × 10⁻¹² / 8)^(1/5) ≈ 1.26 × 10⁻³ mol/L

Therefore, the solubility of silver carbonate in water is approximately 1.26 × 10⁻³ mol/L.

(b) Solubility in 0.22 M AgClO₃:

In this case, the Ag⁺ ions are already present in the solution due to the presence of AgClO₃. The concentration of Ag⁺ is given as 0.22 M. Since the Ksp expression is [Ag⁺]²[CO₃²⁻], we assume x as the solubility of Ag₂CO₃ in mol/L.

The equilibrium concentration of Ag⁺ ions will be 0.22 + 2x, and the concentration of CO₃²⁻ ions will be 2x.

The Ksp expression is:

Ksp = (0.22 + 2x)²(2x) = 8x³ + 0.88x² + 0.088x

Since the Ksp is still 8.1 × 10⁻¹², we can set up the equation:

8x³ + 0.88x² + 0.088x = 8.1 × 10⁻¹²

Solving for x, we find:

x ≈ 2.92 × 10⁻⁵ mol/L

Therefore, the solubility of silver carbonate in 0.22 M AgClO₃ is approximately 2.92 × 10⁻⁵ mol/L.

(c) Solubility in 0.41 M Na₂CO₃:

In this case, the CO₃²⁻ ions are already present in the solution due to the presence of Na₂CO₃. The concentration of CO₃²⁻ is given as 0.41 M. Since the Ksp expression is [Ag⁺]²[CO₃²⁻], we assume x as the solubility of Ag₂CO₃ in mol/L.

The equilibrium concentration of Ag⁺ ions will be 2x, and the concentration of CO₃²⁻ ions will be 0.41 + 2x. The Ksp expression is then:

Ksp = (2x)²(0.41 + 2x) = 4x³ + 1.64x² + 0.328x²

Again, setting Ksp equal to 8.1 × 10⁻¹², we can solve for x:

4x³ + 1.64x² + 0.328x² = 8.1 × 10⁻¹²

x ≈ 1.20 × 10⁻⁶ mol/L

Therefore, the solubility of silver carbonate in 0.41 M Na₂CO₃ is approximately 1.20 × 10⁻⁶ mol/L.

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Answer:

2.268

Explanation:

5 lb × 0.45359237 = 2.26796185 kg

How to convert Pounds to Kilograms

1 pound (lb) is equal to 0.45359237 kilograms (kg).

1 lb = 0.45359237 kg

The mass m in kilograms (kg) is equal to the mass m in pounds (lb) times 0.45359237:

m(kg) = m(lb) × 0.45359237

Example

Convert 5 lb to kilograms:

m(kg) = 5 lb × 0.45359237 = 2.268 kg

Hope this helped!!!

Answer:

2.26796 kg

Explanation:

A compound that consists of two non-metal elements in its structure and compound is called a binary molecular compound. They can have two different elements in their structures bonded by various bonds like carbon dioxide, sodium chloride etc.

The naming of [tex]\rm H_{2}O[/tex] is dihydrogen oxygen and of [tex]\rm H_{2}O_{2}[/tex] is dihydrogen dioxygen.

Thus, the naming of water is dihydrogen oxygen and hydrogen peroxide is dihydrogen dioxygen.

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Answer : The ΔHo for the given reaction is -244.5 kJ/mol.

Explanation:

Given, the following equations and the corresponding ΔHo values:N2(g) + 2 O2(g) → 2 NO2(g) ΔHo = -107.0 kJ/mol2 NO(g) + O2 → 2 NO2(g) ΔHo = -351.5 kJ/mol

The reaction given is ½ N2(g) + ½ O2(g) → NO(g)

To determine the value of ΔHo for the above process, we can use the given thermochemical equations as follows:

What is meant by thermochemical equation?

Thermochemical equations: The chemical equation which includes the term 'Heat' are referred to as thermochemical equations. They include chemical equations for endothermic reactions and exothermic reactions.

ΔHo for the first equation isΔHo = [2ΔHo (NO2(g))] - [ΔHo (N2(g))] - 2[ΔHo(O2(g))]

We haveΔHo (NO2(g)) = - 107.0 kJ/molΔHo (N2(g)) = 0 kJ/molΔHo (O2(g)) = 0 kJ/mol

To find: ΔHo for the process ½ N2(g) + ½ O2(g) → NO(g)Solution:To obtain the required reaction, we need to subtract equation (1) from equation (2).

The obtained equation is:½ N2(g) + ½ O2(g) → NO(g) ΔHo = [2 NO(g) + O2 → 2 NO2(g)] - [N2(g) + 2 O2(g) → 2 NO2(g)] ΔHo = (-351.5 kJ/mol) - (-107.0 kJ/mol) ΔHo = -244.5 kJ/mol.

Therefore, the ΔHo for the given reaction is -244.5 kJ/mol.

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Answer: the essential parts of a flower

Explanation:

are engaged with seed creation. In the event that a blossom contains both useful stamens and pistils, it is known as an ideal bloom, regardless of whether it doesn't contain petals and sepals. On the off chance that either stamens or pistils are deficient with regards to, the blossom is called imperfect.

The number of moles of tin (II) fluoride in 908 grams of tin (II) fluoride is approximately 2.65 moles.

To determine the number of moles of tin (II) fluoride in a given mass, we need to use the concept of molar mass. The molar mass of tin (II) fluoride (SnF₂) is calculated by adding up the atomic masses of its constituent elements: tin (Sn) and fluorine (F).

The atomic mass of tin is 118.71 g/mol, and the atomic mass of fluorine is 18.998 g/mol. By adding these values together, we find that the molar mass of tin (II) fluoride is 156.71 g/mol.

To calculate the number of moles in a given mass, we use the formula:

Number of moles = Mass (in grams) / Molar mass.

In this case, we have 908 grams of tin (II) fluoride. Plugging the values into the formula, we get:

Number of moles = 908 g / 156.71 g/mol = 2.65 moles.

Understanding the relationship between mass, moles, and molar mass is fundamental in chemistry. This concept allows us to convert between different units and make quantitative calculations.

The molar mass plays a crucial role in determining the number of moles in a given mass and vice versa. Exploring further applications of moles and molar mass, such as stoichiometry and chemical reactions, can provide a deeper understanding of chemical processes and their measurements.

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To calculate the pH at each stage of the titration, we need to consider the reaction between HClO and KOH. The balanced chemical equation for the reaction is:

HClO(aq) + KOH(aq) → KClO(aq) + H2O(l)

Before the addition of any KOH, we have only the HClO solution. HClO is a weak acid, so we can use the ionization constant (Ka) to calculate its initial concentration of H⁺ ions. Since HClO is the only acid present initially, the initial concentration of H⁺ ions is equal to the initial concentration of HClO. Therefore, [H⁺] = 0.220 M.

To calculate the pH after each addition of KOH, we need to determine the amount of HClO that reacts with KOH. From the balanced equation, we can see that the stoichiometric ratio between HClO and KOH is 1:1. This means that for every mole of HClO that reacts, an equal number of moles of H⁺ ions are consumed.

Before addition of any KOH:

[H⁺] = 0.220 M (given)

pH = -log10(0.220) ≈ 0.66

After addition of 25.0 mL KOH:

The amount of HClO reacted can be calculated using the initial concentration and the volume of KOH added. Since the concentration of KOH is the same as HClO, the concentration of HClO remaining is (0.220 M - 0.220 M/4) = 0.165 M. The volume of HClO solution remaining is (50.0 mL - 25.0 mL) = 25.0 mL = 0.025 L. Therefore, [H⁺] = 0.165 M/0.025 L = 6.6 M.

After addition of 35.0 mL KOH:

Following the same calculations as above, [H⁺] = 0.110 M.

After addition of 50.0 mL KOH:

[H⁺] = 0.055 M.

After addition of 60.0 mL KOH:

[H⁺] = 0.022 M.

Keep in mind that pH is a logarithmic scale, so as the concentration of H⁺ ions decreases, the pH value increases.

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The observed emission spectrum of elemental hydrogen gas is; Series of Lines, colors, Balmer Series, and Ultraviolet and Infrared Lines.

The emission spectrum of elemental hydrogen gas consists of a series of discrete and distinct lines of different colors.

Series of Lines; The emission spectrum of hydrogen gas consists of a series of sharp, discrete lines rather than a continuous spectrum. Each line corresponds to a specific transition between energy levels in the hydrogen atom.

Colors; The lines in the hydrogen emission spectrum are of different colors, representing different wavelengths of light. The colors observed in the Balmer series include red, blue-green, violet, and other shades in between.

Balmer Series; The Balmer series is the most prominent and well-known part of the hydrogen emission spectrum. It corresponds to transitions where the electron in the hydrogen atom jumps from higher energy levels (n ≥ 3) to the second energy level (n = 2). The visible lines in the Balmer series include Hα (red), Hβ (blue-green), Hγ (violet), and so on.

Ultraviolet and Infrared Lines; In addition to the visible lines, the hydrogen emission spectrum also includes ultraviolet and infrared lines. The ultraviolet lines belong to the Lyman series (transitions to the first energy level, n = 1), while the infrared lines belong to the Paschen series (transitions to higher energy levels, n > 2).

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The Right to Know Law is a law that mandates access to information held by the government. It applies to all states and localities in the United States. However, there are exceptions to this rule. In addition to public safety and privacy concerns, there is a category of information that is explicitly excluded from the Right to Know Law. (a) A professional cleaning product is an example of a material that is excluded from the Right to Know Law.

As per the given options, a professional cleaning product is an example of a material that is excluded from the Right to Know Law. In 1984, the federal government amended the Right to Know Law to require businesses to provide information about hazardous chemicals in the workplace to employees. This law, known as the Hazard Communication Standard (HCS), requires employers to make information about hazardous chemicals available to employees in the form of Safety Data Sheets (SDSs) and labels.The HCS applies to all employers with hazardous chemicals in their workplace and requires them to provide their employees with 100-word descriptions of the hazards associated with those chemicals, as well as information on how to protect themselves from exposure. Therefore, a professional cleaning product is an example of a material that is excluded from the Right to Know Law.

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Answer:

B

Explanation:

Pressure is directly proportional to temperature

The reagents necessary to accomplish the following transformations are listed below:

Transformation 1
The transformation for this reaction is: CH3CH2CH(CH3)CH2CH3 -> CH3CH2CH2CH2CH3 Reagents used:
The reaction is an isomerization reaction that involves the shifting of the location of the methyl group. This reaction can be catalyzed by any of the three acidic catalysts: H2SO4, H3PO4, or BF3.

Transformation 2
The transformation for this reaction is: CH3CH2CH2OH -> CH3CH2CHO Reagents used:
The reaction is an oxidation reaction that involves the oxidation of alcohol to aldehyde. This reaction can be catalyzed by PCC (Pyridinium Chlorochromate).

Transformation 3
The transformation for this reaction is: CH3CH2CH2OH -> CH3CH2CH2Br Reagents used:
The reaction is a substitution reaction that involves the substitution of hydroxyl group with bromine. This reaction can be catalyzed by any of the two reagents: PBr3 or SOCl2.

Transformation 4
The transformation for this reaction is: CH3CH2CH2Br -> CH3CH2CH(CH3)OH Reagents used:
The reaction is a substitution reaction that involves the substitution of bromine with the hydroxyl group. This reaction can be catalyzed by any of the two reagents: Mg and dry ether or NaBH4.

Transformation 5
The transformation for this reaction is: CH3CH2CH(CH3)OH -> CH3CH2CH(CH3)Br Reagents used:
The reaction is a substitution reaction that involves the substitution of the hydroxyl group with bromine. This reaction can be catalyzed by any of the two reagents: PBr3 or SOCl2.

Transformation 6
The transformation for this reaction is: CH3CH2CH(CH3)Br -> CH3CH2COOH Reagents used:
The reaction is an oxidation reaction that involves the oxidation of alkyl halides to carboxylic acid. This reaction can be catalyzed by any of the two reagents: KMnO4 or HNO3.

Transformation 7
The transformation for this reaction is: CH3CH2CH2OH -> CH3CH2CH(CH3)CH2OH Reagents used:
The reaction is a dehydration reaction that involves the removal of water from the compound. This reaction can be catalyzed by any of the two reagents: H2SO4 or H3PO4.

Transformation 8
The transformation for this reaction is: CH3CH2CH(CH3)CH2OH -> CH3CH2CH2CH2COOH Reagents used:
The reaction is an oxidation reaction that involves the oxidation of the secondary alcohol to carboxylic acid. This reaction can be catalyzed by any of the two reagents: KMnO4 or HNO3.

Transformation 9
The transformation for this reaction is: CH3CH2CH2OH -> CH3COCH3 Reagents used:
The reaction is an oxidation reaction that involves the oxidation of primary alcohol to ketones. This reaction can be catalyzed by any of the two reagents: PCC or CrO3.

Transformation 10
The transformation for this reaction is: CH3COCH3 -> CH3CH2COOH Reagents used:
The reaction is an oxidation reaction that involves the oxidation of the ketone to carboxylic acid. This reaction can be catalyzed by any of the two reagents: KMnO4 or HNO3.

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the element with highest melting point among Tc, Ag, Rb is Tc that is technetium, while the element which highest melting point among Hg, Os, Ba is Os that is osmium. both of these elements belong to the d block also known as transition elements.

there is no regular trend in the melting point among the d block elements and tungsten is the elements with the highest melting point among the transition elements. the s block elemts on the other hand have relatively low melting points.

Rb and Ba belong to s block thus have lower melting points in comparison to d block elemts like technetium, osmium, silver, and mercury. s block metals are soft and have low melting points due to very week inter-metallic bonding between its atoms.

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In an acid-base reaction involving a neutral base B, the conjugate acid will be H₃O⁺. Option B is correct.

In an acid-base reaction involving a neutral base B, the conjugate acid will be formed by the addition of a proton (H⁺) to the base.

H₂O; Water (H₂O) is not a base but can act as an acid in certain reactions. It can donate a proton to form the hydroxide ion (OH⁻), making it a conjugate base rather than a conjugate acid.

H₃O⁺; The hydronium ion (H₃O⁺) is formed when a proton (H⁺) is added to water (H₂O). It is commonly found in aqueous acidic solutions and can act as an acid by donating a proton. Therefore, H₃O⁺ is the correct answer as it represents the conjugate acid in this acid-base reaction.

OH⁻; The hydroxide ion (OH⁻) is a base, not an acid. It accepts a proton (H⁺) to form water (H₂O) in basic solutions. OH⁻ would be the conjugate base, not the conjugate acid.

Hence, B. is the correct option.

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--The given question is incorrect, the correct question is

"In an acid-base reaction involving neutral base B, what will be the conjugate acid Select the correct answer below , A) H₂O B). H₃0 C). OH⁻."--

Scenario C: Visible light is in the middle of the yellow region of the visible spectrum. Here, we have to estimate its wavelength, frequency, and energy per photon. The wavelength of visible light in the middle of the yellow region of the visible spectrum is approximately 575 nm.

The frequency of the given light can be calculated by using the formula c = νλ where ν is the frequency of light, λ is the wavelength of light, and c is the speed of light. Hence the frequency is given by,ν = c / λν = 3.0 x 10^8 m/s / 575 x 10^-9 mν = 5.22 x 10^14 Hz. To calculate the energy per photon, we use the formula E = hc/λ where h is Planck's constant and c is the speed of light. E = hc/λE = (6.63 x 10^-34 J s) x (3.0 x 10^8 m/s) / (575 x 10^-9 m)E = 3.45 x 10^-19 J per photon.

Scenario D: Visible light has a photon energy of 4.160 x 10^-19 J. Here, we have to determine its wavelength, frequency, and colour. We can use the formula E = hc/λ to find the wavelength of light, where E is the energy of the photon. λ = hc/Let's substitute the given values.λ = (6.63 x 10^-34 J s) (3.0 x 10^8 m/s) / 4.160 x 10^-19 Jλ = 4.8 x 10^-7 m.

The frequency of light can be calculated using the formula c = νλ, where c is the speed of light.ν = c / λν = 3.0 x 10^8 m/s / 4.8 x 10^-7 mν = 6.25 x 10^14 Hz.

To determine the colour of visible light, we can use a chart that maps wavelength to colour. From the chart, it can be seen that the visible light of wavelength 480 nm is blue. Therefore, the visible light in scenario D is blue.

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Answer:

You would find starch in a plant leaf.

Explanation:

This is due to the fact that when there is excess energy, it will be stored in plant tissue as starch.