Suppose the amount of a certain radioactive substance in a sample decays from 1.60 mg to 900. µg over a period of 67.9 seconds. Calculate the half life of the substance. Round your answer to 2 significant digits.

Q: HX F (sour) H + X1 (Kа 3 7.5 х 105) (sweet) At what pH would this system start to taste sweet…

A: Answer : handerson haslbatch equation pH =pKa + log [X-]/[HX] pKa = -log (Ka) = -log (7.5*10^(-5))…

Q: Identify the reaction of the following reaction: formation of (R)-1-methoxypentane from…

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Q: (a) One amino acid that is likely to have a net negative charge at pH 8. (b) One amino acid that may…

A: Since you have posted a question with multiple sub-parts, we will solve first three subparts for…

Q: sing the uiermodynamic information in the ALEKS Data tab, calculate the sta C(s, graphite) + 2Cl,…

A: Given-> C(s)  +. 2Cl2(g) -----> CCl4(g)

Q: best solvent that can differentiate the pairs

A: First compound is amine and cyclic ether hence more polar in nature while compound B has secondry…

Q: Examine the components of the solution below. Which term best describes the salt?

A: * Nacl is known as sodium chloride * It is a ionic compound and soluble in water

Q: art 2 A. Enumerate five other properties of minerals that is dependent with light and explain each

A: Note:- As per bartleby guildelines, an expert is allowed to answer one question at a time. Please…

Q: Anton collects 750 ml of a gas into a flask at a temperature of 300C. After heating the vapor to…

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Q: The Ką of hypochlorous acid (HCIO) is 3 x 108. What is the pH at 25.0 °C of an aqueous solution that…

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Q: 1. Which of the following will have the greatest standard molar entropy (S°)? a. Hea b. H2Om c. NH3)…

A: Here we have to determine entropy change in the following given cases.

Q: Ba(OH), is a strong electrolyte. Determine the concentration of each of the individual ions in a…

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Q: d. KNO, - KNO, + 02 е. К+ Н0- кон + На f. P,010 + H20 → H3PO4

A: Balance the following chemical reactions--

Q: 14. (Enthalpy and entropy of reaction from AH°; and S°) Given the following reaction 4HCI(g) + O2(g)…

A: Given reaction : 4HCI(g) + O₂(g) → 2Cl₂(g) + 2H₂O(g)

Q: A 20,000 L tank of ethylene oxide is formed at 748 kPa and 525 K, the gas is cooled to 293 K. The…

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Q: Balance the following redox half-reactions

A: A redox reaction is balanced by balancing the mass and charge. In an acidic medium, the charge of…

Q: (b) What is E-factor?

A: E - factor is used in Green chemistry which is a ratio of total mass of waste and mass of product.…

Q: Carry out following conversion. Provide suitable reagents, reaction conditions and also mechanism…

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Q: e concentration of HCl is

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Q: Answer each question in 5 to 10 sentences only.  1. Why are the groups in the periodic table…

A: In Periodic table , all the elements are classified as A block and B block elements. A block…

Q: (a) Compare the old (Boot's method) and new syntheses of Ibuprofen in the light of Green Chemistry…

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Q: 25.0mL ofsOM HA (Ka=3xo) is tleated mith45M bOt. Caleulate the pit. at the endpaint

A: given, volume of HA = 25.0 mL Molarity of HA = 0.50 M Molarity of NaOH = 0.45 M we need to calculate…

Q: 3. (a) Arrange the following compounds according to their reactivity towards electrophile. Justify…

A: We are required to arrange the given five membered heterocyclic compound in increasing order of…

Q: VII. Predict the sign of entropy. Write P if it is positive and N for negative. Write your answer on…

A: Since you have a question with multiple parts, we can solve only first three parts for you. If you…

Q: HINI I In the equation below, which substance is the Brønsted- Lowry base? H O- H. H N-H + 0-H H N-H…

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Q: Phosphorus-32 is radioactive and has a half life of 14.3 days. How much of a 9.00 mg sample would be…

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Q: 10) Calculate the %(v/v) of solute in the following solutions. Hint use density equation to get…

A: % v/v of any solute is calculated by the following formula.  % v/v = volume of solutevolume of…

Q: how would you test for the presence of the following ions in aqueous solution of an unknown salt?…

A: (a) Iodide ion, I- -  Iodide ion can be determined by silver nitrate test in which add some amount…

Q: What is Hess's law explain with example?

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Q: Which of the following SN reactions will take place? 1. NH2 + + NH2 2. HO- -F OH + 3. CN + + CN

A: Given reactions are :  Which of the following nucleophilic substitution (SN) reactions will takes…

Q: (c) Predict the product(s) for the following reaction with supporting mechanism. i) SeO2 Ag diovone

A: Selenium dioxide, SeO2 is an oxidizing agent generally employed in the allylic oxidation of alkenes…

Q: Give an examples of a redox reaction.

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Q: V. A statement of Assertion (A) follówéd by ä štatement Reason (R) is given in the following…

A: The amount of heat either released or absorbed in a reaction is known as the enthalpy of reaction.…

Q: Question 13 Compute the mass of KCI needed to prepare 1000 mL of a 1.50 M solution. Show your work.…

A: Given- Volume=1000mL=1L Concentration=1.50M

Q: Organic Chemistry The section asks for the synthesis: draw/ provide the likely organic products

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Q: How many mL of (1.2000x10^-1) M nitric acid are needed to react completely with (3.35x10^1) mL of…

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Q: Methyl red (Ka = 6.3 x 10-6) is a common acid-base indicator. Its un-ionized form is red and its…

A: PKa =- log Ka  Where Ka = dissociation constant

Q: Nombre Ciclohexanol Ácido Fosfórico Ciclohexeno Agua Forma Molecular C6H120 H3PO4 C6H10 H20 Р.М.…

A: Density = Mass / Volume So, Mass = Density * Volume Also, No of moles = Mass / Molar mass

Q: 2. Why is it important to choose a specific dye to a particular substrate or fabric/textile type? 3.…

A: 2. Answer - Textile substrates are formed from yarns or fiber webs by several techniques including…

Q: Match the molecular ion (from electron impact mass spectrometry) with the correct compound. (Make…

A: We have the identity the compound from the given molecular ion peak at 122.

Q: How many liters (L) of hydrogen sulfide (at 25 ºC and 1.00 atm) are obtained if 3.52 g of ferrous…

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Q: 5. Explain the principle of 'Using Safer solvent taking suitable example of a conventional reaction…

A: In Green Chemistry, the principle of safer solvents promotes the use of safer solvents and…

Q: question 1 What is the pH at the midway point of the titration of 51.00 mL of a 0.01500 M solution…

A: Given-> Volume of HCl(V1) = 51.00 ml Molarity of HCl(M1)= 0.01500 M Molarity of LiOH(M2) =…

Q: 3)Use Table 7.2 from textbook to answer this question. TABLE 7.2 Examples of Solute Solubilities in…

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Q: (CH),CuLi CH3 b) HOCH,CH,OH CH3 c) H,NNHC,H, HC. CH3

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Q: Select two reagents that will synthesize the following ether using Williamson ether synthesis:

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Q: A medical technician is working with the four samples of radionuclides listed in the table below.…

A: Radioactive decay follows the first-order kinetics. The half-life of the first-order reaction does…

Q: what is the name of the compound?  Identify the configuration of the double bond.

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Q: 7. Which of the following compounds will elute LAST in a reverse phase chromatography? A. ONF

A: In reverse phase chromatography, the stationary phase is non-polar and mobile phase is polar.

Q: Using s rd reduction potentials from the ALEKS Data tab, calculate the standard reaction free energy…

A: Using equation: ∆G0=  -nFE0 cell  ∆G0 = standard Gibbs free energy  n = no. of electron in that…

Q: Br + CH3O'Na* methanol 2. CI + NH3 ethanol 3. CI ethanol CH3 ONa*

A: (1) When bromobutane is treated with sodium methoxide in presence of methanol then methoxy butane is…

Writing and Balancing Nuclear Equations

A nuclear equation is a symbolic representation of a nuclear reaction using certain symbols. It is studied in nuclear chemistry and nuclear physics.