5. A sample of sodium-24 with an activity of 12 mCi is used to study the route of blood flow in the circulatory system. What is the activity after three half-lives?

Q: 6. Br Which of the following statements best summarize the observed results of the reaction? (There…

A: Substitution reaction takes place by SN1 or SN2 mechanism.

Q: A student dissolves 10.1 g of ammonium chloride (NH4CI) in 200. g of water in a well-insulated open…

A: Given, The mass of the NH4Cl = 10.1 g Mass of the water = 200 g The molar mass of the NH4Cl = 53.49…

Q: Classify each chemical reaction: 2Na(s) + Cl₂ (g) 2NaCl(s) 4 HCl(aq) + NaOH(aq) NaCl(aq) + AgNO3(aq)…

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Q: Find the pH of a buffer that consists of 0.120 M boric acid (H3BO3) and 0.820 M sodium borate…

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Q: What element am I?  a) In my natural state I am a diatomic element. When I form an ionic compound, I…

A: In an atom, there is nucleus at the centre and electrons are revolving around it. In nucleus, there…

Q: 4. Draw the organic products formed in each reaction and indicate stereochemistry when necessary. a.…

A: o Na/Liq NH3 reduces alkyne to trans alkene o H2/Pd-C reduces alkene to alkane o PCC oxidizes…

Q: The following chemical reaction takes place in aqueous solution: MnCl₂(aq) +2 KOH(aq) →Mn(OH)₂(s)+2…

A: The chemical reaction is given and we have to tell the net ionic equation of the given reaction.

Q: A radioactive sample has a half-life of 28.1 y. 18 98.0 39 of the sample were allowed to decay for…

A: Since you have posted multiple questions, we will provide the solution only to the first question as…

Q: What volume of propane (C3H8) is required to produce 64.8 liters of water according to the followin…

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Q: A substance at a starting temperature of 375 K is cooled to 196 K. Select ALL of the statement below…

A:

Q: Calculate the pH of a 2.6X10^-4 M solution of HClO4, a strong acid, at 25ºC. pH=

A: pH of a solution is defined as the negative logarithm of the concentration of H+ ion.

Q: A sample of neon effuses from a container in 73 seconds. The same amount of an unknown noble gas…

A: Given : tneon = 73 seconds               tunknown = 149 seconds

Q: Calculate the millimoles in 0.75ml of n-methylaniline. Density 0.99g/ml

A:

Q: Using chemical equations, show how the triprotic acid H₂PO4 ionizes in water. Phases are optional.…

A: Triprotic acid : It is a acid which has three number of replaceable / dissociable protons (H+) in it…

Q: 10.6 Propose a reasonable organic reaction mechanism for the reaction shown below using the curved…

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Q: Use Boyle's law to complete the following table (assume temperature and number of moles of gas to be…

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Q: CH3 Br C=C H CH₂CH3 Br₂ (CH3)2Culi

A: (CH3)2CuLi is a  soft nucleophile. Here CH3- acts as the nucleophile . Br2 in presence of sunlight…

Q: 2. Draw the organic products formed in each reaction. Draw all stereogenic centers using wedges and…

A: Note: According to Bartleby guidelines, the first three parts of the multiple subparts question…

Q: A voltaic cell is constructed in which the cathode is a standard hydrogen electrode and the anode is…

A: We have find out the PH of unknown solution at 298 K.

Q: Liquid hexane (CH3 (CH₂) CH3) reacts with gaseous oxygen gas (0₂) to produce gaseous carbon dioxide…

A: Given -> Weight of hexane = 4.31 gm  Weight of O2 = 27.8 gm  Actual yield of CO2 = 7.66 gm

Q: 10.3 What reagents would you use to prepare this alkyl halide from the corresponding alcohol? Hot…

A: The formation of alkyl bromide from alcohol takes place through nucleophilic substitution reaction.…

Q: Methane reacts with oxygen to form carbon dioxide and hydrogen gas, according to the balanced…

A:

Q: 37. Consider the balanced equation for the combustion of methane, a component of natural gas: CH4(g)…

A: Given Reaction :-  CH4 + 2O2 -----> CO2 + 2H2O Mass of O2 = 2.57 g

Q: Identify the mechanism

A: Given : reactions

Q: What is the oxidation number of the central metal atom in the coordination compound [Pt(NH3)3Cl]Cl?

A: oxidation number, is the hypothetical charge of an atom if all of its bonds to different atoms were…

Q: Suppose that in a random selection of 100 colored candies, 25% of them are blue. The candy company…

A: Number of colored candies = 100 Percent of blue candies = 25 % Company claims that the percentage of…

Q: Write balanced molecular, overall ionic, and net ionic equations for the reaction between an aqueous…

A:

Q: Identify the reaction mechanism

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Q: If a solution has a [H+]=1 x 10 -3 M, what is the pOH of that solution? Group of answer choices 11…

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Q: What is the C-terminal amino acid in the tetrapeptide glycylalanyisoleucylmethionine? Multiple…

A: What is the C-terminal amino acid in the tetrapeptide glycylalanyisoleucylmethionine?

Q: A stepwise reaction  (A+2B ----> 3D) has the following elementary steps:        A  ------> C (slow…

A:

Q: Carbonic acid, H₂CO³ is a diprotic acid with Ka1 = 4.3 x 10-7 and Ka2 = 5.6 × 10-¹¹. What is the pH…

A: Given: Ka1 = 4.3×10-7 Ka2 = 5.6×10-11 Molarity of carbonic acid = 0.18 M

Q: 10) Which of the following aminoacids is achiral? A) Alanine B) Glycine C) Cysteine D) Tyrosine E)…

A: Since, Chiral molecule are those whose all four group or atoms  are different and that atom which is…

Q: Which of the following semiconductor  has the lowest band gap? Group of answer choices Ge Pb Sn Si

A: Semiconductor is a material which has an electrical conductivity value falling between that of a…

Q: emist carefully measures the amount of heat needed to raise the temperature of a 360.0 g sample of a…

A: Specific Heat capacity is amount of heat required to increase the temperatures of one gram of…

Q: Which metal between magnesium, zinc, aliminum, tin, iron, calcium and copper is predicted to be the…

A: Metal reacts with oxygen to form metal oxide   Metal + oxygen → metal oxide

Q: An unknown inorganic phosphate undergoes first-order dehydration in a drying oven. Initially, the…

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Q: How can the following molecules be classified correctly? 1 II Multiple Choice II and III are…

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Q: Given the solubility, calculate the solubility product constant (Ksp) of each salt at 25°C:…

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Q: A mixture is prepared by dissolving sugar in 100 g of water. In this mixture, sugar is the Osolute,…

A: Solute is a substance which is dissolved and solvent is a substance in which solute is dissolved…

Q: In a 0.09 M solution of chlorous acid, what percentage of the acid is ionized to the chlorous anion,…

A: Value of Acid dissociation constant, Ka = 1.1 × 10-2

Q: 1- What happens to the H atom In 2CH4 + 3O2  2CO + 4H2O? 2

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

Q: Question 4 In a lead-acid battery, the following reaction takes place: Pb(s) + PbO2 (s) + 2H₂SO4…

A: Answer(a) 2.0501V

Q: The enthalpy of reaction is -11.7 kJ/mol for the following reaction:   HCN(aq) + NaOH(aq) -->…

A:

Q: Volumetric Analysis  Part B a. In determining the percent acetic acid in vinegar, the mass of each…

A: Acetic acid, sometimes referred to as methane carboxylic acid and ethanoic acid, is a clear,…

Q: Concentrated acetic acid is 18.4 M; whereas white vinegar is 0.778 M acetic acid. How much…

A: Given information concentration of concentrated acetic acid, M1 = 18.4 M Volume of concentrated…

Q: Electrolysis can be used to purify silver.  What mass of silver would plate onto the pure electrode…

A: One Mole of electron = 96500 C

Q: THE REACTION: 2 NO (4) + Cl₂(₁)→ 2 NOCI (gr) 1) CONSIDER

A: Rate of reaction: The change in the concentration of reactant and product per unit of time is known…

Q: Determine the equilibrium constant for a reaction at 200 K if AG°=19.6 mol. K) kJ/mol. (R = 8.314 J/

A:

Q: 10.5 What reagents would you use to prepare this alkyl halide from the corresponding alcohol? OH t F

A: