A ground state hydrogen atom absorbs a photon of light having a wavelength of 92.27 nm. It then gives off a photon having a wavelength of 922.7 nm. What is the final state of the hydrogen atom

Answer:

True

Explanation:

Cell specialization is the process by which generic cells change into cells meant to do certain tasks within the body

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Given: Volume of HBr = 250 mLVolume of KOH = 200 mLConcentration of HBr = 2.1 MConcentration of KOH = 2.5 MTo find: pH of the resulting solution. Therefore, the pH of the resulting solution is 10.7.

Step 1: Calculate moles of HBr and KOH.Moles of HBr = concentration × volume (in L) = 2.1 × (250/1000) = 0.525 molesMoles of KOH = concentration × volume (in L) = 2.5 × (200/1000) = 0.5 molesStep 2: Identify limiting reactant.HBr + KOH → KBr + H2ONumber of moles of HBr and KOH are not equal, thus HBr is limiting reactant because it produces fewer moles of product than KOH.HBr + KOH → KBr + H2O0.525 moles 0.5 moles 0.5 molesStep 3: Calculate moles of HBr and KOH reacted.Moles of HBr reacted = moles of KOH = 0.5 molesMoles of HBr left = 0.525 - 0.5 = 0.025 molesStep 4: Calculate molarity of the resulting solution.Molarity = moles of solute/volume of solution(in L) = (0.025 moles + 0.5 moles) / (250+200) / 1000 = 0.001875 MStep 5: Calculate pOH of the resulting solution.OH- + H2O → H3O+ + OH-pOH = -log [OH-]Molarity of OH- = molarity of KOH reacted (since they react in a 1:1 ratio)= 2.5 × (0.2/1000) = 5 × 10^-4pOH = -log (5 × 10^-4) = 3.3Step 6: Calculate pH of the resulting solution.pH + pOH = 14pH = 14 - pOH= 14 - 3.3 = 10.7Therefore, the pH of the resulting solution is 10.7.

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This battery could be made stronger when we make lithium the anode and make zinc the cathode.

We know that the term electron affinity has to do with the fact the a specie is able to attract electrons. Hence, the specie that can be able to attract electrons is said to be have a greater electron affinity.

If we look at the order of the reactivity of the metals, we can see that the lithium has more tendency to exist as a positive ion as such the electron affinity of the lithium atom is very negative and it does not attract electrons.

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1) Beryllium. This element is in the second group and the second period. The atomic number is 4 which is the number of protons.

The mass number is the sum of neutrons and protons.

Assuming the element has no charge the number of electrons is equal to the number of protons.

Protons: 4.

Neutrons: the mass number - the atomic number = 9 - 4 = 5.

Electrons: 4.

Answer:

it helps bring energy to earth

Answer:

Rabbit they eat plants for energy

Explanation:

Answer:

Clover

Explanation:

A clover is the only organism that makes its own food, usually from the sun. The other three need to eat to get their energy. Rabbits eat plants, owls eat insects, and hawks eat other types of animals such as fish.

Instrumental methods of chemical analysis have several advantages over traditional methods. Some of these advantages are; Increased sensitivity, specificity, Speed, Accuracy and precision, and Quantitative analysis.

Instrumental methods are often more sensitive than traditional methods, allowing for detection and quantification of lower concentrations of analytes.

Instrumental methods can distinguish between different analytes that have similar chemical properties, which is not possible with some traditional methods.

Instrumental methods are often faster than traditional methods, allowing for the analysis of a larger number of samples in a shorter period of time.

Instrumental methods are generally more accurate and precise than traditional methods, due to the use of advanced instrumentation and automation.

Instrumental methods can be used to measure the quantity of a specific analyte in a sample, which is not always possible with traditional methods.

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The periodic convolution is equal to x[n]y[n] when N = 3, the answer depends on the specific values of x[n] and y[n].

To find the Fourier series of the product z[n] = x[n]y[n], we can follow these steps:

(a) Calculate the product x[n]y[n]:

z[n] = x[n]y[n] = (1 + en)(1 + 2n)

Expanding the product:

z[n] = 1 + 2n + en + 2en^2

(b) Use the periodic convolution of length N = 3 of the Fourier series coefficients of x[n] and y[n]:

To find the Fourier series coefficients of z[n], we convolve the Fourier series coefficients of x[n] and y[n] over a period of length N = 3. Let's denote the Fourier series coefficients as X[k] and Y[k].

The periodic convolution of length N is defined as:

Z[k] = (1/N) * sum(X[l] * Y[k-l], l=0 to N-1)

For N = 3, we have:

Z[k] = (1/3) * sum(X[l] * Y[k-l], l=0 to 2)

Now we need to calculate the individual Fourier series coefficients of x[n] and y[n] in order to perform the convolution.

Given that the fundamental period wo = 27/N, the fundamental frequency is w0 = 2π/wo = 2πN/27.

For x[n]:

x[n] = 1 + en

The Fourier series coefficients are given by:

X[k] = (1/N) * sum(x[n] * exp(-jkw0n), n=0 to N-1)

Substituting the values:

X[k] = (1/3) * sum((1 + en) * exp(-jkw0n), n=0 to 2)

Similarly, for y[n]:

y[n] = 1 + 2n

The Fourier series coefficients are given by:

Y[k] = (1/N) * sum(y[n] * exp(-jkw0n), n=0 to N-1)

Substituting the values:

Y[k] = (1/3) * sum ((1 + 2n) * exp(-jkw0n), n=0 to 2)

Now we can evaluate the convolution expression to obtain the Fourier series coefficients of z[n].

Regarding whether the periodic convolution is equal to x[n]y[n] when N = 3, the answer depends on the specific values of x[n] and y[n].

The periodic convolution is a mathematical operation that combines the Fourier series coefficients of two signals to obtain the Fourier series coefficients of their product. It may or may not be equal to the product of the original signals, depending on their specific properties and the chosen value of N.

To determine if the periodic convolution is equal to x[n]y[n] when N = 3, we need to perform the calculations and compare the results.

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Answer:

2Al(s) + 6HCl(aq)→2AlCl3(aq) + 3H2(g)

Answer: C12H12Al2O18

Explanation:

Answer:

[PCl₃] = 0.031M

[Cl₂] = 0.031M

[PCl₅] = 0.969M

Explanation:

Based on the reaction:

PCl₅(g) ⇄ PCl₃(g) + Cl₂(g)

Where Keq = 1.0x10⁻³ = [PCl₃] [Cl₂] / [PCl₅]

Inital [PCl₅] = 2.0mol / 2.0L = 1M.

In equilibrium:

[PCl₃] = X

[Cl₂] = X

[PCl₅] = 1M-X

Where X is reaction coordinate

Replacing:

1.0x10⁻³ = [X] [X] / [1-X]

1.0x10⁻³ - 1.0x10⁻³X = X²

1.0x10⁻³ - 1.0x10⁻³X - X² = 0

Solving for X:

X = -0.032M. False solution, there is no negative concentration

X = 0.031M

That means equlibrium concentrations are:

[PCl₃] = 0.031M

[Cl₂] = 0.031M

[PCl₅] = 1-0.031M = 0.969M

Answer: 167.2 J

Explanation:

Answer:

The correct answer is Choice C.

(Phenol red indicator.)

Explanation:

Phenol red indicator is an organic dye that acts as an acid-base reaction indicator in the pH range of 6.8 to 8.4.

In acidic solutions, the color is purple, and in simple solutions, the color is red.

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Answer:

phenol red indicator

Explanation:

Answer: A.En Hedu'Anna

Answer:

En Hedu’Anna!

Explanation:

Answer:

Cutting hair is a physical change since it doesn't change the substance its still hair

bending a paper clips since it's also the same substance

Ice cube melting

Explanation:

All of these are physical change since there reversible and they all still stay the same substance

Answer:

Gap 1, S-Phase, Gap 2, Prophase, Metaphase, Anaphase, Telophase, Cytokinesis

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The general equation for the reaction of a halogen with a metal (assuming a 2+ charge on the metal) is: 2M + X₂ → 2MX

In this equation, M represents the metal (with a 2+ charge) and X represents the halogen. The reaction involves the combination of one mole of the metal with one mole of the halogen to form two moles of the metal halide compound (MX).

The 2M on the left side of the equation represents two moles of the metal, each with a 2+ charge. The X₂ represents one mole of the halogen, which exists as a diatomic molecule (e.g., Cl₂, Br₂, I₂).

During the reaction, the metal atoms lose two electrons each to achieve a stable 2+ charge, and the halogen atoms gain one electron each to complete their valence shell. This results in the formation of two moles of the metal halide compound (MX) in which the metal is in its 2+ oxidation state and bonded to the halogen.

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The percentage yield of the reaction is 60%. To find the percentage yield of the reaction, we need to first calculate the theoretical yield of carbon dioxide (CO2).

CH4 + 2O2 → CO2 + 2H2O From the equation, we see that 1 mole of CH4 reacts with 2 moles of O2 to produce 1 mole of CO2. Therefore, we need to calculate the moles of both CH4 and O2 in the given mixture and determine which reactant is limiting the reaction.

The molar mass of CH4 is 12 + 4(1) = 16 g/mol. Therefore, the number of moles of CH4 present in the mixture is:

15 g / 16 g/mol = 0.9375 mol

The molar mass of O2 is 2(16) = 32 g/mol. Therefore, the number of moles of O2 present in the mixture is:

52.5 g / 32 g/mol = 1.6406 mol

According to the balanced equation, 1 mole of CH4 reacts with 2 moles of O2 to produce 1 mole of CO2. Therefore, the maximum number of moles of CO2 that can be produced from the given amounts of CH4 and O2 is:

0.9375 mol CH4 × (1 mol CO2 / 1 mol CH4) = 0.9375 mol CO2

Since 1.6406 mol O2 is more than enough to react with the 0.9375 mol CH4, O2 is in excess and CH4 is the limiting reactant. Therefore, the theoretical yield of CO2 is:

0.9375 mol CO2 × (44 g/mol CO2) = 41.25 g CO2

Now we can calculate the percentage yield of the reaction:

Percentage yield = (actual yield / theoretical yield) × 100%

The actual yield of CO2 is given as 24.75 g. Therefore, the percentage yield is:

(24.75 g / 41.25 g) × 100% = 60%

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That is incorrect. The olfactory nerves pass through foramina in the cribriform plate of the ethmoid bone, not the crista galli of the sphenoid bone.

The cribriform plate is a part of the ethmoid bone located in the anterior cranial fossa, and it contains numerous small openings called olfactory foramina through which the olfactory nerves pass.

The ethmoid bone is a delicate, sponge-like bone located between the nasal cavity and the brain. It consists of two lateral masses and a central vertical plate called the perpendicular plate. The cribriform plate is a thin, horizontal part of the ethmoid bone that forms the roof of the nasal cavity.

Within the cribriform plate, there are multiple tiny foramina known as olfactory foramina. These foramina allow the passage of the olfactory nerve fibers, which are responsible for transmitting the sense of smell from the olfactory epithelium in the nasal cavity to the olfactory bulb in the brain.

So, to clarify, the olfactory nerves pass through foramina in the cribriform plate of the ethmoid bone, not the crista galli of the sphenoid bone. It's important to have accurate anatomical knowledge, especially when studying or discussing the cranial nerves and their pathways.

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Answer:

Why would the addition of alkali to this system lead to less CO2 (aq) being present? Because the alkali would neutralise the acid in the system. This would reduce the concentration of acid in the system.

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The given electron configuration belongs to the element fluorine (F).

If an atom of fluorine approaches an atom with one valence electron (such as an alkali metal atom), a bond can form. Fluorine has seven valence electrons, and it requires one more electron to complete its octet (i.e., eight valence electrons) and achieve a stable electron configuration.

Therefore, fluorine will tend to gain one electron from the atom with one valence electron, forming a stable ionic compound. Alternatively, fluorine could share one electron with the atom with one valence electron, forming a covalent bond, but this is less likely due to the large difference in electronegativity between fluorine and alkali metals.

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Answer:

B. the role of creativity in scientific discovery

Explanation:

Watson and Crick's ball-and-stick model of DNA demonstrates the importance of creativity in science. Creativity involves having a questioning mind that is always searching for answers and which employs logical reasoning to arrive at these answers. After Rosalind Franklin obtained an X-ray diffraction of DNA, Scientists Watson and Crick expanded on this knowledge by creatively organizing ball and sticks in a manner that represenseted the structure of the DNA.  

This simple creative act led to more discoveries about the DNA including the facts that their was a pairing wherein Adenine paired with Thymine and Cytosine paired with Guanine. They also found that the DNA structure could be unzipped and that copying was also possible. They used the simple things around them to arrive at this conclusion. This is an example of the importance of creativity in science.

A drop of ink will spread faster as higher the temperature is. The higher the temperature, the more agitated the molecules will be, so they will move faster. So the mobility of the particles is related to their temperature.

So:

Particles in Flask C show the greatest mobility of the particles, this flask will have the highest temperature.

Particles in Flask A show the least mobility, this flask will have the lowest temperature.

Answer:

Flask A 10°C

Flask B 25 °C

Flask C 50 °C

The mobility of the particles is related to their temperature. The particles in Flask A show the least mobility, and the particles in Flask C show the greatest mobility.

To solve the given problems, we'll follow a step-by-step approach. Let's begin:

a) To determine the molar fractions of the volatiles and fixed carbon, we need to calculate the moles of each component based on their weight percentages and molar masses.

Given:

- Volatiles (V) weight percentage = 38.86 wt.%

- Fixed carbon (FC) weight percentage = 61.14 wt.%

- Average molar mass of the volatile compound = 4.857 g/mol

To calculate the molar fractions, we'll use the following formula:

Molar fraction = (Weight percentage / Molar mass) / Σ(Weight percentage / Molar mass)

Molar fraction of volatiles (XV):

XV = (38.86 / 100) / [(38.86 / 100) + (61.14 / 100)] = 0.3886 / 0.6 = 0.6477

Molar fraction of fixed carbon (XFC):

XFC = (61.14 / 100) / [(38.86 / 100) + (61.14 / 100)] = 0.6114 / 0.6 = 1.0190

Note: The sum of molar fractions should be equal to 1. Since the fixed carbon fraction is slightly higher, we'll normalize it by dividing it by its value.

b) The balanced stoichiometric combustion equation for the given volatile compound can be written by considering the complete oxidation of carbon, hydrogen, and nitrogen to CO2, H2O, and NO2, respectively.

The molecular formula for the volatile compound is not provided, so let's assume it as CxHyNz.

The balanced equation for complete combustion is as follows:

CxHyNz + (x + y/4 - z/2)(O2 + 3.76N2) → xCO2 + y/2H2O + z/2NO2 + (x + y/4 - z/2)(3.76N2)

c) To write the balanced combustion equation for 120% theoretical air, we need to account for the excess air. The theoretical air required for complete combustion can be determined by the stoichiometry of the equation in part b.

Given:

- Theoretical air required = 100%

For 120% theoretical air, the equation becomes:

CxHyNz + (x + y/4 - z/2)(1.2 O2 + 3.76N2) → xCO2 + y/2H2O + z/2NO2 + (x + y/4 - z/2)(4.52N2)

d) The molar air-to-fuel ratio (A/F) is the ratio of the number of moles of air to the number of moles of fuel.

To calculate the molar A/F ratio, we need to consider the stoichiometry of the balanced stoichiometric combustion equation from part b.

e) To determine the LHV (Lower Heating Value) of coal in MJ/kg, we need to calculate the heat released per kilogram of coal during complete combustion.

Given:

- Enthalpy of formation of the volatile compound = -140,000 kJ/kmol

- Formation enthalpy of solid carbon = 0 kJ/kg

The LHV of coal can be calculated using the following formula:

LHV = (Σ(Molar fraction × Enthalpy of formation)) / Molar mass

f) To calculate the amount of coal burned in a 700 MWe (MegaWatt electric) boiler unit in 1 day, we need to consider the thermal

efficiency

Given:

- Thermal efficiency of the boiler unit = 34.5%

- Power output of the boiler unit = 700 MWe

- Duration of operation = 1 day

To calculate the amount of coal burned, we'll use the following formula:

Coal burned (in tonnes) = (Power output × Time) / (LHV × Thermal efficiency)

Now, let's calculate the values for each part step-by-step.

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Answer:

Hope it helps:)

Explanation:

Wavelength can be defined as the distance between two successive crests or troughs of a wave. It is measured in the direction of the wave. This means the longer the wavelength, lower the frequency. ...

To find the wavelength of a wave;

The wavelength is calculated from the wave speed and frequency by λ = wave speed/frequency, or λ = v / f.

Answer:

4

Explanation:

If an electron shell can hold a maximum of 32 electrons the value of n = 4

The reaction as follows,

(CH₃)₂NH (aq) + H₂O (aq) ------------> (CH₃)₂​​​NH₂⁺ (aq) + OH⁻ (aq)

The net ionic equation will be,

(CH₃)₂NH  (aq) + H⁺(aq) ---------> (CH₃)₂​​​NH₂⁺  (aq)

Bronsted-Lowry base are proton acceptor, so (CH₃)₂NH  is a base as, it accepts proton to form (CH₃)₂NH . A Brønsted-Lowry base is any species that is capable of accepting a proton, which requires a lone pair of electrons to bond to the H⁺ . Water is amphoteric, which means it can act as both a Brønsted-Lowry acid and a Brønsted-Lowry base.

The net ionic equation will be,

(CH₃)₂NH  (aq) + H⁺(aq) ---------> (CH₃)₂​​​NH₂⁺  (aq)

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