If you start with 1 million atoms of a particular radioactive isotope, how many half-lives are required to reduce the number of undecayed atoms to fewer than 1000? 10 100 1001 1000

Q: 4. K;Cr20, + KI + H;PO4 5. K,Cr,0, + FeSo, + H,SO, I2 + CrPO, + KPO4 + H;0 Cr,(SO.), + Fe;(SO,); + K...

A: Loss of electron is oxidation and Gain of electron is reduction.  On other hand we can say that, inc...

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A: Pycnometer:   Pycnometer is used  to measure and compute densities or specific gravities of li...

Q: Consider the chemical reactions below and their given deltaG of reactions; NiO(s) → Ni(s)+0,(g) AG° ...

A: Any chemical reaction is said to feasible if it is spontaneous i.e., ∆Grxn is negative.

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A: The color of a solution of pH 0.2 is needed to be determined on the addition of an acid-base indicat...

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Q: A mixture of xenon and neon gas is compressed from a volume of 100.0 L to a volume of 99.0 L, while ...

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Q: The concentrations of enzymes in cells are usually quite small. What is the biological significance ...

A: The enzymes are used in biological reactions. These biological reactions are taking place in the liv...

Q: Na Mg 38 48 58 68 78 88 – 18 28 AI SI P S CI Ar Arrange the following ions in order of decreasing io...

A:

Q: Consider the following reaction Clila 3Fale) 2CIF la) If a flask initially contains 3.0 atm of Clle)...

A: Here in this reaction Cl2 gas is in excess . So it will remain with the product after completion of ...

Q: The water gas shift reaction below is used in the production of hydrogen. CO +H,O → CO, +H, 2 g 2(g)...

A:

Q: Write the balanced net ionic equation for the precipitation of magnesium sulfide from aqueous soluti...

A: We have to write the balanced net ionic equation for the precipitation of magnesium sulfide from aqu...

Q: O on the bavis dew ig exp lan oridalive additien in In e He achon Uņeaci on

A:

Q: If a total of 125 mL of a 10% solution is diluted to 500 mL in a 500-mL volumetric flask, what is th...

A: 1.) As the initial 10% solution is diluted , so we would use dilution law to calculate concentration...

Q: ewis structures shown contains one polar covalent bond. Identify the bond, and use th olarity.

A: Polar covalent bond is formed when atoms having different electronegativity share electrons in a cov...

Q: A mixture of nitrogen and hydrogen gas is compressed from a volume of 78.0L to a volume of 62.0 L, w...

A: Final volume = 62L = Vf Initial Volume = 78L = Vi External pressure = Pext = 65atm The process is an...

Q: physical chemistry 2, thermodynamics Exercise 2 Calculate the change of enthalpy, entropy and Gibbs ...

A:

Q: 1. Calculate the change in the internal energy for a process in which a system absorbs 140 J of heat...

A: Given data :  1.  Heat absorb (Q) = 140 J  2. Work done (W) = - 85 J ( system does  work on system s...

Q: You need to make 100 mL of a 2.5% dextrose solution for a hypoglycemic kitten using the 50% stock so...

A: Given that, a 100 mL of 2.5% dextrose solution for a hypoglycemic kitten using the 50% stock solutio...

Q: Nitrogen dioxide is one of the many oxides of nitrogen (often collectively called "NOx") that are of...

A: GIVEN:-  

Q: ute solution of hydrochloric acid with a mass of 606.87 g and containing 0.31625 mol of HCl was exac...

A:

Q: Calculate the pH during the titration of 20.00 mL of 0.1000 M ethylamine, C2H5NH2(aq), with 0.2000 M...

A: Volume of ethylamine = 20.00 mL  Molarity of ethylamine = 0.100 M Molarity of nitric acid = 0.200 M ...

Q: Consider the following reaction If a lask initially contains 3.0 atm of Cle) and 3.0 atm of Fale), w...

A: Cl2 + 3F2 -----> 2ClF3 Initial pressure of Cl2 = 3atm Initial pressure of F2 = 3atm Reaction is o...

Q: What mass of Fe,O, is produced when 17.3 L of O, gas react with FeS at 496 K and 5.76 atm. 4 FeS(s) ...

A:

Q: Part A Hydrogen can be extracted from natural gas according to the following reaction: CHa (9) + CO2...

A: Given:-   To find:- Mass of H2(g).  At the equilibrium=?

Q: Which of the following compounds reacts faster in an elimination reaction with KOH? Also provide the...

A: Alkyl halided given E2 elimination reaction with KOH. In the E2 elimination reaction, the removal of...

Q: Calculate the pH when 1.35 g of C6H5COONa (FW = 144.1 g/mol) is added to 38 mL of 0.50 M benzoic aci...

A: The pH can be calculated  as follows 

Q: 2. Determine the molar solubility of CuS (Kp = 1.27 x103 in each liquid or solution provided below: ...

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Q: This is the chemical formula for acetic acid (the chemical that gives the sharp taste to vinegar): C...

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Q: (CH,(CH),CH,) CH reacts with gaseous oxygen gas (0,) to produce gaseous carbon dioxide (CO,) and gas...

A: Recall the reaction that will occur between liquid hexane and gaseous oxygen               C6H14l + ...

Q: One mixes AgNO3 and NaCl. A precipitate forms. That precipitate is: a) AgNa    b)  NO3Cl    c)  AgCl...

A: Precipitation Reaction : The chemical reaction occurring in an aqueous solution where two ionic bond...

Q: What is the standard enthalpy of reaction per mole of either HCl or NaOH when 50.00 cm3 of 0.1 moldm...

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Q: Will all the reactions below proceed to completion? Provide an explanation. CH3CH2Br + NaOCH3 CH3B +...

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Q: The density of tantalum at 20°C is 16.69 g/cm³ and its unit cell is cubic. Given that the first five...

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Q: Ammonium perchlorate (NH,CIO,) is the solid rocket fuel used by the U.S. Space Shuttle. It reacts wi...

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Q: 3. At a pressure of 780.0 mm Hg and 24.2 °C, a certain gas has a volume of 350.0 mL. What will be th...

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Q: Question #2 on first image. Acid base reactions needed for #2 on second image.

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Q: At what point (how many milliters of added acid) was the solution in beaker “B” neutralized?     N...

A: NaHCO3 + CH3COOH ---> CH3COONa + H2O Sodium bicarbonate reacts with acetic acid which is present ...

Q: Liquid octane (CH;(CH,) CH,) reacts with gaseous oxygen gas (0,) to produce gaseous carbon dioxide (...

A:

Q: How do I calculate molar solubility and ksp? Thanks!!

A: Ksp of Ca(OH)2 = [Ca2+] * [OH-]2

Q: number of oxygen atoms in

A:

Q: What is the dilution, if 1.0 mL of serum is added to 9.0 mL of diluent?

A:

Q: A standard galvanic cell is constructed in which a Cu2+ | Cu half cell acts as the cathode. Which of...

A: The correct statement about galvanic cell is given below

Q: Gaseous methane (CH) reacts with gaseous oxygen gas (0,) to produce gaseous carbon dioxide (CO,) and...

A: Given that, mass of water= 9.49 g, molar mass = 18 g mol-1 mass of methane =13.2 g, molar mass = 16 ...

Q: 5) The density of a 2.45 M aqueous solution of methanol (CH3OH) is 0.976 g/mL. What is the molality ...

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Q: Calculate the heat required to increase the temperature of 630 grams of ice from -2°C to 23°C and tu...

A: A numerical problem based on thermochemistry that is to be accomplished.

Q: Identify the best reagents to complete the following reaction.

A:

Q: Provide the products for the below reactions: HgSO4 H,SO4 ВНЗ, ТHF H2O2, OH", H2O

A: HgSO4 and aqueous dilute H2SO4 is used for alkyne hydration. Alkynes hydration is much harder than a...

Q: A buffer consists of 0.21 M H3PO4 and 0.38 M NaH2PO4. Given that the K values for H3PO4 are, Ka1 = 7...

A: Given that, a buffer is made by 0.21 M of H3PO4 and 0.38 M of NaH2PO4. The dissociation constant val...

Q: Determine the pH at the equivalence (stoichiometric) point in the titration of 44.27 mL of 0.138 M m...

A: Given data : Concentration of morphine = 0.138 M Volume of morphine = 44.27 mL Concentration of HCl ...

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.