he fluorescence of a fluorophore is quenched in the presence of iodide ions. (i) Would the fluorescence quantum yield in the presence of iodide be larger or smaller than the fluorescence quantum yield in the absence of iodide? Explain your answer.   (ii) Would the fluorescence lifetime of the fluorophore in the presence of iodide be longer or shorter than the lifetime in the absence of iodide? Explain your answer.

Q: The first-order decomposition of a colored chemical species, X, into colorless products is monitored…

A: Lambert beer's law Absorbance=Ecl

Q: Technetium (Tc) is a by-product of the spontaneous fission of Uranium-238 and as such is of…

A:

Q: A TIO2 photocatalyst was used to destroy pollutant compounds in a sample of water. The catalyst was…

A:

Q: 4. (a) The radioactive isotope 32P has a half-life of 14.3 days. If a sample contains 0.884 g of…

A: Half life of P-32 isotope = 14.3 days = 1235520 sec 22 days = 1900800 seconds

Q: The frequency factor for a second-order gas-phase decomposition of a species at low pressures is 2.3…

A: According to Arrhenius equation, the relation between rate constant k, activation energy Ea, and…

Q: The first-order decomposition of a colored chemical species, X, into colorless products is monitored…

A: Given molar absorptivity constant, E = 5.00 × 103 cm–1 M–1  path length, b = 1.00 cm Rate  constant,…

Q: The equilibrium NH3(aq) + H₂O(l) →NH4+ (aq) + OH(aq) at 25 °C is subjected to a temperature jump…

A: According to the question we have an equilibrium reaction for the hydrolysis of ammonia which is…

Q: A drug is infused intravenously (IV) for treatment of a particular disease. The infusion rate of the…

A:

Q: The equilibrium NH3(aq) + H2O(1)→NH4+ (aq) + OH(aq) at 25 °C is subjected to a temperature jump…

A: According to the question we have an equilibrium reaction for the hydrolysis of ammonia which is…

Q: k1 The mechanism A + A A2* A2* + M k2 K2 A2+ M k.1 is common in reactions of the type A + A + M → A2…

A: Step 1: DimerizationA + A <-> A2*In this step, two molecules of A collide and form an excited…

Q: The equilibrium NH3(aq) + H2O(l) ↔NH4+(aq) + OH−(aq) at 25 °C is subjected to a temperature jump…

A: Given: NH3 (aq) + H2O (l) ↔NH4+(aq) + OH-(aq) Temperature (T) =25 °CRelaxation time (t)=7.61…

Q: In a study of the decomposition of nitramide in aqueous solution at 25 °C NH,NO,(aq)N20(g) + H20(1)…

A: NH2NO2(aq) ...> N2O(g) + H2O(l)  Graph of ln[NH2NO2] v/s time is straight line .

Q: (c) A new radioactive element, Fitzgeraldium, is discovered. After 2 days, 80% of a sample of…

A: The radioactive active decay follows first order kinetics. Let the initial number of nuclei be A0…

Q: 11) The photo-decomposition reaction mechanism of HI can be expressed as follows, HI+hv→H+I,…

A:

Q: The first step in plant photosynthesis is absorption of light by chlorophyll molecules bound to…

A: The relation between transition energy and lifetime in fluorescence is as follows: ET=1-ττ0…

Q: Assuming the value of Ea calculated from the 36-degree drop and assuming that the rate of breakdown…

A: We have find out the answer.

Q: When benzophenone is exposed to ultraviolet radiation, it is excited into a singlet state. This…

A: Answer -

Q: For the gaseous reaction A + B → P, the reactive cross-section obtained from the experimental value…

A:

Q: In formaldehyde, the transition n> n*(T,) occurs at 397 nm, and the n>r*(S,) transition comes at 355…

A: Given two states labelled as T1 and S1 having different energies. two transitions occur from energy…

Q: Scientists can determine the age of ancient objects by the method of radiocarbon dating. The…

A: Half life of 14C = t1/2 = 5730 yr

Q: How many intermediates are present in the proposed mechanism of lodine clock reaction? (note:…

A: Chemical reactions can be added, subtracted, or multiplied like an algebraic equation.

Q: In a study of the gas phase decomposition of hydrögen iödide at HI(g)V½ H2(9) + ½ I½(g) the…

A:

Q: In a study of the decomposition of ammonia on a platinum surface at 856 °C NH31/2 N2 + 3/2 H2 the…

A:

Q: Explain and justify the assumptions that are used to derive the Langmuir isotherm .

A: The Langmuir adsorption model explains adsorption by assuming an adsorbate behaves as an ideal gas…

Q: (c) If T, = 1x10-7 s, T, = 4x 10-8 s, and T3 = 1x10-8 s, calculate the lifetime of the singlet state…

A:

Q: Describe the strategy of a temperature-jump experiment. What parameters of a reaction can be…

A: Introduction A temperature-jump experiment is a technique used in biophysical chemistry and…

Q: The adsorption of a gas is described by the Langmuirisotherm with a= 1.85 kPa-1 at 25 oC. Calculate…

A: Given: a=1.85 k Pa-1 To find: pressure of the gas

Q: (4) The molecularity of reaction is (a) Always two (b) Same as its order (c) Different than order…

A: Molecularity of the reaction is equal to the number of molecules which participate in a chemical…

Q: In a study of the formation of HI from its elements,H₂(g)+I₂(g)→ 2HI(g) equal amounts of H₂ and I₂…

A: a.

Q: a. Identify THREE (3) isotherm shapes that are typically encountered in an adsorption process for a…

A:

Q: (d) The first-order rate constants for the fluorescence and phosphorescence of molecule X are 4.5 x…

A: Answer  Both fluorescence and phosphorescence are the luminescence. They absorbs photon(light) and…

Q: 4. Which of the following best describes the timescales of fluorescence and phosphorescence? (a)…

A: Fluorescence is emission of substances by radiative pathways from singlet state to ground state. It…

Q: Explain the difference between Kf and Ksp

A:

Q: Explain the similarities and differences of phosphorescence and fluorescence in view of atomic and…

A: phosphorescence and fluorescence are the emitted radiation by the substance that has absorbed light.

Q: Chlorine atoms react with methane, forming HCl and CH3. The rate constant for the reaction is 6.00 ×…

A:

Q: In a study of the decomposition of ammonia on a platinum surface at 856 °C NH31/2 N2 + 3/2 H2 the…

A: Answer

Q: The spacing between bands of color in a chemical wave from an oscillating reaction is measured to be…

A: Given data is as follows: The wavelength of the wave = 1.2 cm The time taken to appears a new wave =…

Q: What are the significance of the value of the slope, the value of the y-intercept, and the…

A: Half-life is the time taken by a  sample to reduce its initial value to half. The general…

Photochemistry

Photochemistry is the part of chemistry that studies the various mechanisms of reactions that are triggered by the presence of light energy. It also helps to study the changes involved in a molecule that can undergo the absorption of radiation.