A medical technician is working with the four samples of radionuclides listed in the table below. Initially, each sample contains 20.00 µmol of the radionuclide. First, order the samples by decreasing initial radioactivity. Then calculate how long it will take for the amount of radionuclide in each sample to decrease to 1/16 of the initial amount. radionuclide time for amount of initial sample radionuclide to decrease to radioactivity symbol half-life 1/16 of initial amount 68 I minutes v (choose one) 1 (highest) A Ga 68.0 minutes 31 141 3 33.0 days I days Ce 4 (lowest) 58 122 I 4.0 minutes |(choose one) v |minutes 53 105 Rh 35.0 hours |(choose one) v hours 45

Q: At a particular temperature, N 20 5 decomposes according to a first-order rate law with a half-life…

A:

Q: H.C

A: Answer:

Q: What are the entropy changes for 1.00 mol of water undergoing reversible  vaporization and fusion at…

A: Given-> Moles = 1 mole ∆Hvap = 40.656 KJ/mole ∆Hfus = 6.009 KJ/mole Boiling point (Tb) = 100°C =…

Q: a. Which of the following statements concerning structural isomerism is/are INCORRECT? (1)…

A:

Q: 15. For each of the following statements, identify which quantum number (n, I, mj or m,) that is…

A: A) principal quantum number - - > n B) relates to electron spin - - > ms C) relates to the…

Q: Are CO2, CO, HCl environemetal pollutant? If they are, why?

A: Carbon monoxide is one of the most pollutant gas which harms our environment so badly and it is…

Q: The rotational partition function for 1271 1271 at the equilibrium bond length is equal to 929.…

A: Given qrot = 929 To determine qrot if the bond was strectched by a factor of 1.35

Q: Place the best reagent and conditions in the bins for each of the following reactions. One of the…

A:

Q: Draw the major and minor products of the following reaction. (H3C),CCH,CH3 H2SO4 heat ÓH

A:

Q: 3. Draw a Newman projection (staggered) viewing from C2-C3 of  (a) 3-methyl-2-butanol (b)…

A:

Q: 2. Using the average molarity in #1, determine the total hardness of water sample used in the…

A: Using 1,MEDTA=MCaCO3VCaCO3VEDTA

Q: The equilibrium concentrations for the reaction between carbon monoxide and molecular chlorine to…

A: Which one of following is correct answer

Q: A sample of gas has an initial volume of 285 mL at a pressure of 1.5 atm at 25 C. If the gas is…

A:

Q: Use the bond energies to estimate the enthalpy change, AH°, for the reaction нн H -¢ -C -H (g) Cl-…

A:

Q: Draw the Lewis structure and geometry shape for so, Don't forget to show the number of available…

A: The lewis structure of SO42- is as follows -

Q: Hydroxylation with osmium tetroxide adcls with anti-stereochemistry. Select the correct response:…

A: Hydroxylation reaction : Hydroxylation reaction is an oxidation reaction. In presence of Osmium…

Q: If 16.45 mL of ammonium thiocyanate solution is required to react completely with 25.00 mL of 0.1546…

A: Answer: These questions are based on the stoichiometric calculation where we have to calculate the…

Q: Part C If distilled water sells in a grocery store for $1.32 per gal what percentage of the sales…

A:

Q: Which direction will the reaction proceed to reach equilibrium? Select an answer and submit. For…

A:

Q: 3. Provide a retrosynthetic analysis of the following compound from cyclohexene and any other…

A:

Q: Organometallic reagents such as sodium acetylide undergo an addition reaction with ketones, giving…

A: Given reaction is :

Q: 1. OH Br +EN 2. .CI H. 3.

A:

Q: 1.Using the radius ratio, predict the type of hole where the Mg2+ ion is present in the MgS crystal…

A:

Q: Provide the major organic product in the reaction shown below. Ph Br NAOCH3 H3C Ph

A:

Q: Consider the decomposition of liquid benzene, C6H6 (), to gaseous acetylene, C2H2 (g) C6 H6 (1) →…

A: a) When a chemical reaction is reversed, the sign of enthalpy change of reaction also get reversed…

Q: Draw the Lewis structure and determine the geometry shape for BH3 Don't forget to show the number of…

A: Given: Chemical formula: BH3 The geometry of this molecule and the number of valence electrons have…

Q: Which practice is NOT used to gauge accuracy? raw data and results from calibration checks B.…

A: Accuracy is used to determine whether given results is close to true value and it is free from…

Q: 4. 2Na (s) + 2H2O (I) → 2NaOH (aq) + H2 (g) If the reaction produces 3.0 g of hydrogen gas, how many…

A:

Q: provide answer and solution

A: Two charges Q1 = +3 nC and Q2 = -7 nC are separated by a distance of 50 cm., The modulus of electric…

Q: 4) Cr,O,²- + Ut+→ Cr* + UO,2

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

Q: A compound contains 77.73% Fe and 22.27% O by mass. Calculate the empirical formula.

A: given :- % by mass of Fe = 77.73%  % by mass of O = 22.27%  MW of Fe = 55.85 g/mol  MW of O = 16.00…

Q: 4. What is the electron configuration (1s, etc.) for Barium (Ba)? Identify the valence electrons by…

A: According to Hund's rule , Aufbau principles and Pauling exclusion principles electrons are arrange…

Q: A chemist dissolves 461. mg of pure barium hydroxide in enough water to make up 180. mL of solution.…

A:

Q: When 0.378 g of sodium metal is added to an excess of hydrochloric acid, 3930 J of heat are…

A: Given-> Weight of Na = 0.378 g Heat produced for 0.378 g = 3930 J  (1 KJ = 1000 J)

Q: How many grams of magnesium hydroxide would be needed to react with 6.55 g of nitric acid?

A: Given :- amount of nitric acid = 6.55 g  To calculate :- amount of magnesium hydroxide required (in…

Q: Solutes tend to obey Henry's Law.

A:

Q: What is the molar solubility of CuCl (Ksp=1.7 x 10-7) in a solution of 0.023 M FeCl2?

A:

Q: Determine how many IR and Raman active modes there are in C2V molecule SF4.

A: There are three IR active and 4 Raman active modes in SF4.

Q: Organometallic reagents such as sodium acetylide undergo an addition reaction with ketones, giving…

A: Sodium acetylide in an nucleophile it undergoes nucluophilic addition as well as substitution…

Q: What could be the product of this alkene as it reacts with reagent KMnO4?

A: KMnO4 is a strong oxidising agent  If alkene is treated with KMnO4 ,  it is oxidised into…

Q: Draw the structures of all possible organic products formed in the reaction. Do not draw counterions…

A:

Q: Draw the Lewis structure and geometry shape for SF6 Don't forget to show the number of available…

A: SF6 Central atom = Sulfur Side atoms = Fluorine

Q: The equilibrium constant, Kp, for the following reaction is 0.110 at 298 K: NHẠHS(s) NH3(9) + H2S(g)…

A:

Q: Two moles of acetyl chloride was mixed with two moles of dimethylamine. After the reaction is…

A:

Q: 1. BCI3 and NF3 both have 3 atoms around their central atom. However, according to VSEPR theory they…

A: In NF3 three bond pair and one lone pair is present

Q: 8. Which of the following elements has the largest first ionization energy? A) CI B) S C) Si D) Mg…

A:

Q: is 5 kg/ day. The residual concentration after 10 min contact is 0.1 mg/L. Calculate the dosage and…

A:

Q: The cell potential was 1.271 V at 25oC and a Al3+(aq) concentration of 0.178 M. What was the…

A:

Q: 0.0 mL of 0.070M pyridine (C5H5N) is titrated with 0.070M HCl. (Kb for C5H5N is 1.7 x 10^-9). What…

A: Hii there, As there are multiple sub parts posted. we are answering first-three sub parts . If you…

Q: Write the set of 4 quantum numbers that would be used to describe the last two electrons that would…

A: Electron configuration of elements is written by following 1) Aufbau's principle :- It states that…