What percent of a parent isotope would remain after two half lives?  50% 25% 13% 66

Q: 1. 10, 2. SO,2- 3. CIO,

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Q: Which of the following is true of the isoelectric point of amino acids?   The isoelectric points of ...

A: pH is defined as negative logarithm of hydrogen ions in the solution. 

Q: One erlenmeyer contains 50 mL of 0.1 M Na2CO3 solution, the other erlenmeyer contains 50 mL of 0.1 M...

A: A question based on concentration terms that is to be accomplished.

Q: Simply each condensed structure by using parentheses around similar groups. CH3 c. HOCH,--CH,CH,CH2-...

A: Please find your solution below : Condensed structure of an organic compound is the representation o...

Q: Pyrrole can be reduced to a pyrroline, with zinc and acetic acid. What are the possible structures t...

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Q: i need an introduction about mixtures and the mixture of water and salt at least 15 lines please don...

A: two or more different types of materials. Physical means can be used to separate them. A solution of...

Q: Get the number of particles of the following substances. а. Atoms of boron in 22.2 g boron, B b. Mol...

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Q: Present the 3-membered ring pathway for the following reactions. Br CH;OH Illustrate the concerted p...

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Q: Question 1 For the reaction CO (g) + H,0 (8) -C0 28) 26), calculate the following reaction's thermod...

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Q: Assume full dissociation of electrolytes. Pick the aqueous solution that would have the: lowest vapo...

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Q: c=x Li Al CH, CHe

A: ->LiAlH4 is a reducing agent which can reduce cyanide to amine. ->Rosenmund reduction reduce a...

Q: Using activity coefficients, calculate the concentration of Co" present in a 0.1 M solution of KNO3 ...

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Q: Using the thermodynamic information in the ALEKS Data tab, calculate the standard reaction entropy o...

A:   Finds :      Calculated the standard entropy.   Formula :           (∆S°) = Σ nP× Sf°P  -  Σ nr × ...

Q: What must be the concentration of SO 4 2− to just start precipitation of SrSO 4 from a solution whic...

A: Given, the Ksp of SrSO4 = 3.200×10-7 We have to calculate the concentration of SO42− to just start p...

Q: What is meant by the phrase, "the binding constant is determined by how fast things come together an...

A: A question based on equilibrium concept that is to be accomplished.

Q: Provide the full mechanism for nitration of benzene. Show how the electrophile is formed and how the...

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Q: I. HNO3 and NaNO3 can constitute a buffer solution. II. HCOOH and NaCH3COO can constitute a buffer s...

A: A buffer solution is that which resist the change of pH after adding small amount of acid or base to...

Q: Draw a Newmann projection for the most stable conformation of the following molecule looking down th...

A: Stereochemistry is branch of chemistry in which we deal with arrangement of atoms in molecule in thr...

Q: Consider the following system at equilibrium where AH° = -198 kJ, and Kc = 34.5, at 1.15x103 K. %3D ...

A: The Effect of decrease of volume on the given parameters is calculated Lechaterlier principle which ...

Q: Illustrate the carbocation pathway for the following reactions + H20 (acid-catalyzed) Illustrate the...

A: Organic reactions are those in which organic reactant react to form organic products. 

Q: What is the pH of a solution with 10.0mL 0.1M NH3 and 0.15mL 1.0M HCl ? Kb = 1.8x10^-5

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Q: =) Fe (FCC) p) Cn (FCC) ) Mg (HCP)

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Q: The pH of a water sample is found to be 6.3. It is titrated with 4.5mL of 0.02 N NaOH to a pH of 8.3...

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Q: What are the accompanying changes of: A. Iron rusting B. Burning wood C. Cooking an egg D. The expl...

A: There are two types of changes in the universe- physical change and chemical change.

Q: Given 4.08 X 1023 molecules of A, the number of moles of A is calculated as: O 4.08*10^-23/(6.022) O...

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Q: Formation of Elements Complete the following nuclear reactions and identify the cosmic phase (nucleo...

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Q: Complete the following radioactive decay formulas. (Enter the missing reactant or product. Enter you...

A: Complete the following radioactive decay formula ---

Q: A blood sample contains 9.2 mM of glucose. If the molar mass of glucose is 180 g/mol, what is the bl...

A: Molarity of glucose = 9.2 mM  molar mass of glucose = 180 g/mol

Q: What is the pH when: a. 0.15 mL of 1 M NaOH has been added to 30.0 mL of 0.10 M NH3? b.0.15 mL of ...

A: Given: Kb of NH3 = 1.8×10−5 Ka of NH3 = 5.55×10−10 pKb of NH3 = 4.75 pKa of NH3 = 9.25  

Q: How many grams of N2 are needed to make 444 g of NBr3 ?  N2   +   3 Br2   →   2 NBr3   +   44.0 kJ ...

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Q: The following compounds are of interest in pharmaceutical chemistry, since they are part of the synt...

A: 2-Methyl-5-phenylthiophene is part of the synthesis of active drug ingredients.

Q: Methane is a major component of natural gas. How many moles of CH, are present in 607 grams of CH4?

A: Given-> Weight of CH4 = 6.07 gm Weight of vinegar (C2H4O2) = 230 gm  

Q: WHAT IS THE NUCLEAR MASS AND NUCLEAR DENSITY OF plutonium?

A: We have to write the nuclear mass and nuclear density of plutonium .

Q: e) Discuss whether the following reaction will be reversible or irreversible. OH cP Cl

A: Since you have asked multiple questions, as per guidelines we will solve only the first one for you....

Q: etermined by how fast things come how fast they fall apart"?

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Q: In the synthesis of B, two consecutive reactions are required that start from the furan to obtain A ...

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Q: 1. A solution containing 1.0% (w/v) MgCl2 has a lower concentration compared to a 1.5M MgCl2 solutio...

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Q: Green plants use light from the Sun to drive photosynthesis, a chemical reaction in which liquid wat...

A: Given: Moles of carbon dioxide = 0.70 mol

Q: 2. Find the EW of Sodium Bicarbonate (NaHCO3) has a valence charge of 1. (Use whole numbers for each...

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Q: Is water always used in steam distillation?

A: Organic compounds can be defined as compounds that contain hydrogen and carbon atoms.

Q: 7. Air is composed of approximately 78% Nz, 21% 02 and 1% percent other gases. Calculate the density...

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Q: 1.0 g of sample is dissolved in 0.1 kg of chloroform. Chloroform boils at 335.25°K at 1 atm. Determi...

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Q: Is Non- biologic DMARDs an endogenous substance? If yes, discuss its control of release , biosynthes...

A: A traditional DMARD is usually a pill, taken orally. Biologics are made up of proteins and are deliv...

Q: How doyou complete this reaction pathway H3O+

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Q: 4. Write the Partial Pressure Equilibrium: C) + Ozta) → CO2(@)

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Q: Name the following molecules: Cl a. cl CH3 b. CH3-C-CH2-C CH3 С. N. F d.

A: Given compounds are : Write the IUPAC names of the following molecules 

Q: Dichloroacetic acid has a dissociation constant of K = 3.32 x 10-2. Calculate the dogree of dissocia...

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Q: wher

A: Given polymer is : Provide the monomer components of this polymer = ?    

Q: You have prepared an acetic acid buffer solution (pKa = 4.76) containing 0.1 mole each of acetic aci...

A: A buffer solution is prepared by mixing 0.1 mole each of the acetic acid and sodium acetate. Now 0.0...

Q: What is the pH of a solution with 10.2mL 0.10M NH3 and 0.15mL 1.0M NaOH ? Kb = 1.8x10^-5

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