Samples of the following isotopes in pure form, each containing the same number of atoms, are taken. After one year, which sample would still contain the most atoms of the original substance?     a. strontium-90 (half-life 29 years)   b. thallium-206 (half-life 4 min)   c. iodine-131 (half-life 8 days)   d. sodium-24 (half-life 15 hours)   e. lead-210 (half-life 22 years)

Q: Compound Z has a heat of vaporization of 155.9 J/g, a specific heat capacity of 2.08 J/gºC, and…

A: Given, Boiling point = 72.1 °c □Hvap = 155.9 J/g C(l) =  2.08 J/g-°c Mass of. Z(m) = 562.4 g

Q: How many moles and grams of acetic acid would be required if 5.00 g of sodium bicarbonate reacted…

A: Since you have asked multiple question, we will solve the first question for you. If you want any…

Q: A solution with 5 mg/mL of a colored protein has an absorbance of 0.250. What is the concentration…

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Q: Write the palladium-containing product for the following reaction and indicate its stereochemistry:…

A: We can solve this question by using the concept of trans effect where CN- regulates the substitution…

Q: 14. 15. PTSA 16. i) NH, H) P2Os 17. PTSA CN 18. 19. HO. 20. `NH2 21.

A: We have to give the products and the reagents of the given reactions.

Q: constant expression? PROBT Kp = Po PBr2 NO A) 2 NOBR (g) = 2 NO (g) + Br2(g) B) NO (g) + ½ Br2 (g) =…

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Q: how to determine the formula for the complex copper(II) ammine ion?

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Q: What is the initial concentr ation of a 45.0ML N9NO2 Solution that bas been diluted to a Final…

A: By using    M1V1=M2V2,    I am giving my solution in step no. 2

Q: A) What is the Chemical Formula and number of unshared electron PAIRS in the skeletal structure…

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Q: A mixture of pure BaCO3 and pure Na2CO3 weighs 1.000 g and has the total neutralizing  power of…

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Q: in Example 4. Why do the transition elements exhibit higher enthalpies of atomisation? (N, R ne

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Q: What is a standardization and why is it important?

A: Concept:  Standardization: Standardization is the process of determining the exact concentration of…

Q: 42. Cadmium sulfide, CdS, is an insoluble substance with a Ksp of 1.0 X 10º. It dissociates in water…

A: The concentration of any species is defined as the no of moles of that substance present in unit…

Q: In Part A of this experiment, you prepare 5 solutions of FeSCN2* [one of them is just a blank…

A: No of moles = Molarity * Volume (L)

Q: 5. A diatomic molecule A2 has a reduced mass of 1.5x10-23 g, a bond length of 150 pm, and a bond…

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Q: le Chatelier's Principle can be seen in natural systems and one of the more well known examples is…

A: The solution is given below -

Q: 25. Which of the following is usually considered to be a weak acid? A) HCI B) HBr C) HI D) HF 26.…

A: Using formula: PH = - log[H+] where as [H+] --->> concentration of H+ ion

Q: is produced. When O2 is reduced during the electron transport system, O A. ADP O B. H20 OC CO2…

A: The main processes of electron transport system- 1- generation of proton 2- reduction of oxygen  3-…

Q: condensed structural formula for this?

A: In this question we have to tell the condensed structure formula

Q: 46. Which of the following involves a decrease in entropy? A) the sublimation of solid CO2 into CO2…

A: The correct answer about entropy is given below

Q: velow shomed the veaction CU rea-brown Pit

A: Give in following question a reaction terminal alkyne with ammonia +cux and give red brown ppt

Q: Question 16 What is the product of the following reaction? -CCH3 CH3 NaCN H H20 OH CN H H -CCH3 CCN…

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Q: Draw the structures of compounds M and N NaOEt HBr M N ELOH

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Q: Given the rate constant, k, for the decay of a radioactive substance, how would you find the…

A: Given :- rate constant for decay of radioactive substance = k  To find :- half-life (t1/2)

Q: x-1-2 = 0- x = +3 NH3 LANH3 NH3 ONO ove Name of complex #3: Pentamminenitro-O-Cobalt (III) Chloride…

A: We have to find the oxidation state of central metal atom then see the linkage isomers and according…

Q: Which 2-step process would convert the reactant to the product? Excess reagent is implied if needed.…

A: Detail mechanistic pathway is given below

Q: Which of the following choices represents th HO H- HO -OH OH OH он OH OH ÕH II II II OIV

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Q: 6. Consider a trial function y = x(L-x) for a particle in a one dimensional box of length L. Apply…

A: This Question is based upon Quantum mechanics!!

Q: 4. A peptide bond is classified as a(n) C. phosphate bond. A. ester B. amine D. amide E. none of…

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Q: What is the amount of energy required (in KJ) to convert 100g of ice at -20 degrees to steam vapour…

A: Since you have asked multiple question, we will solve the first question for you.If you want any…

Q: synthesis of the molecule

A: Detail synthetic route is given below to carry out the following conversion

Q: Water with an alkalinity of 2.00 x 10-3 eq/L has a pH of 7.0. Calculate [CO2], [HCO3-], [CO32-], and…

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Q: 25. Which of the following is usually considered to be a weak acid? A) HCI B) HBr C) HI D) HF 26.…

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Q: If 50.0 mL of Thiosulfate solution are required to titrate the I2 liberated from an excess of KI by…

A: Given: Volume of S2O32- solution = 50.0 mL. Mass of KIO3 reacted = 0.300 g.

Q: Próblém Suppose that thermal stability experiments have given the following (partial) thermodynamic…

A: ∆G=∆H-T∆S 5.33 *10^3 = 150*10^3 -(45+273)(∆S) (45+273)(∆S) = (150-5.33) *10^3 (∆S)= (144.67*10^3)/…

Q: In scenario C, visible light is in the middle of the yellow region of the visible spectrum. Estimate…

A: Yellow light : yellow, in physics, light in the wavelength range of 570–580 nanometres, which is in…

Q: Which substances in the equation below are classified as Bronsted-Lowry ACIDS: H2S (aq) + H2O0 → H30…

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Q: Acetylene gas, C2H2, burns in oxygen emitting high temperatures used for welding metals. How many…

A: Detail mathematical calculation is shown below

Q: 3. Write the palladium-containing product for the following reaction and indicate its…

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Q: Homework Q1 :- What is the pK, of acetic acid, if K, for acetic acid is 1.58 x 10-6?

A: Pka is equal to negative logarithm of ka

Q: Match the line structure to its corresponding structural formula. 1. HHHH H H-C-C-C-C-C-OH HHHH H 2.…

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Q: 5) Consider the reaction shows below. A can decay to two products, labeled B and C. Both decay…

A: Above reaction is an example of Parallel reaction: Parallel or competing reactions When a reactant…

Q: In order to determine the identity of a metal, its specific heat is found.  When 28 g of the metal…

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Q: 6. Write abbreviated formulas for the six isomeric tripeptides of aspartate, glutamate, and proline.

A: Six isomeric tripeptides of aspartate, glutamate and proline is given below in step no. 2:

Q: Consider the four scenarios involving visible light. In scenario A, visible light has a wavelength…

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Q: Determine the correct coefficient for NaCl (aq) to balance the following chemical equation : BaCl2…

A: According to the Law of conservation of mass " all atoms of different elements must be equal on both…

Q: Calculate e values for the galvanic cells based on the following overall reactions. Assume that all…

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Q: 4) Pick which one of the conjugated dienes would be preferred for 1,2-/1,4-additions as well as…

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Q: What is the reason why cold distilled water is used for washing precipitate?

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Q: 1. Explain nuclear magnetic moment does not align do not immediately align with applied magnetic…

A: The answer of the following question is given as follows: