Chemistry concepts and calculations

a.) The half-life for the radioactive decay of Ce141 is 32.5 days. If a sample h

a.) The half-life for the radioactive decay of Ce141 is 32.5 days. If a sample has an activity of 3.3 Ci after 162.5 d have elapsed, what was the initial activity, in microcuries,…

a.) The rate constant for the reaction is 0.460 M–1·s–1 at 200 °C. A--> products

a.) The rate constant for the reaction is 0.460 M–1·s–1 at 200 °C. A--> products. If the initial concentration of A is 0.00680 M. what is the concentration after 315 s? b.)The …

a.) Two groups of students prepared the compound acetamide. Group A isolated is

a.) Two groups of students prepared the compound acetamide. Group A isolated is a solid with a melting point of 80.5 degrees C. Group B obtained a compound with a melting point of…

a.) Using standard enthalpies of formation, calculateH o for the following react

a.) Using standard enthalpies of formation, calculateHo for the following reaction: 2 C6H6(l)+15 O2(g)-> 12CO2(g)+6 H20(g) b.) How many grams of C6H6(P) must becombusted in the…

a.) What if we suppose that before teachings we have an initial wisdom, m 1 , an

a.) What if we suppose that before teachings we have an initial wisdom, m1, and our wisdom grows linearly with the number of years we spend in school, B, then our model is R = m1 …

a.) What is the molarity of a solution prepared by dissolving 47.1 grams of Ca(O

a.) What is the molarity of a solution prepared by dissolving 47.1 grams of Ca(OH)2 in a total solution volume of 400.0 mL? b.) What volume of the solution in part (a) is required…

a.) Write a detailed procedure for preparing 50.0 mL of 1.20 M HCL. For this pro

a.) Write a detailed procedure for preparing 50.0 mL of 1.20 M HCL. For this procedure you have only the following supplies available (plus any safety gear, equipment, and supplie…

a.) Write a formula for the reactant. b.) List all the ions present in the react

a.) Write a formula for the reactant. b.) List all the ions present in the reactants. c.) Write the formula for the possible products when the salts echange partner ions d.) For e…

a.) Write a formula for the reactant. b.) List all the ions present in the react

a.) Write a formula for the reactant. b.) List all the ions present in the reactants. c.) Write the formula for the possible products when the salts echange partner ions d.) For e…

a.) You have a 1.0-L flask filled with phosphorous pentachloride (PCl5) at a hig

a.) You have a 1.0-L flask filled with phosphorous pentachloride (PCl5) at a high enough temperature such that it is entirely in gaseous form. You remember that PCl5 can decompose…

a.) Zinc metal is currently used for gas production. Compare the ratio by mass o

a.) Zinc metal is currently used for gas production. Compare the ratio by mass of Mg and Al to that of Zn for preparing the same volume of hydrogen gas. Use the data recorded in T…

a.)100 mL of 1.00 M HCl solution is titrated with 1.00 M NaOH solution. You adde

a.)100 mL of 1.00 M HCl solution is titrated with 1.00 M NaOH solution. You added the following quantities of 1.00 M NaOH to the reaction flask. Classify the following conditions …

a.)100 mL of 1.00 M HCl solution is titrated with 1.00 M NaOH solution. You adde

a.)100 mL of 1.00 M HCl solution is titrated with 1.00 M NaOH solution. You added the following quantities of 1.00 M NaOH to the reaction flask. Classify the following conditions …

a.)A certain reaction has an activation energy of 25.10 kJ/mol. At what Kelvin t

a.)A certain reaction has an activation energy of 25.10 kJ/mol. At what Kelvin temperature will the reaction proceed 7.00 times faster than it did at 289 K? b.A certain reaction h…

a.)A solution is prepared by dissolving 10.50g of CaCl2 in 100 mL of water at 25

a.)A solution is prepared by dissolving 10.50g of CaCl2 in 100 mL of water at 25.1 Celsius. What is the molality of the solution? b.)Assuming that all of the solute breaks up into…

a.)A solution is prepared by dissolving 10.50g of CaCl2 in 100 mL of water at 25

a.)A solution is prepared by dissolving 10.50g of CaCl2 in 100 mL of water at 25.1 Celsius. What is the molality of the solution? b.)Assuming that all of the solute breaks up into…

a.)Consider a buffer solution that is 0.50 M in NH3and 0.20 M in NH4Cl. For ammo

a.)Consider a buffer solution that is 0.50 M in NH3and 0.20 M in NH4Cl. For ammonia, pKb=4.75. Calculate the pH of 1.0 L of the solution, upon addition of 49.00 mL of 1.0 MHCl. b.…

a.)Hydrogen sulfide needs to be removed from natural gas prior to putting the ga

a.)Hydrogen sulfide needs to be removed from natural gas prior to putting the gas into a pipeline. This separation can be accomplished by contacting the gases with water to select…

a.)Watch the animation and observe the titration process of a standard 0.100 M s

a.)Watch the animation and observe the titration process of a standard 0.100 M sodium hydroxide solution with 50.0 m ml of a 0.100 M hydrochloric acid solution. Identify which of …

a.We need 20 micrograms of the protein for an experiment. What volume of protein

a.We need 20 micrograms of the protein for an experiment. What volume of protein solution do we need? b.Suppose we want a soln containing 150 micrograms of the protein at a concen…

a.What is the average molecular weight (g/mol)? b.What is the gas density (g/L)?

a.What is the average molecular weight (g/mol)? b.What is the gas density (g/L)? c. What is the composition in weight %? e.What is the linear flow rate (m/min)? 3. A gas mixture c…

a.What is the specific enthalpy and specific volume of steam at 350 c and 60 bar

a.What is the specific enthalpy and specific volume of steam at 350 c and 60 bar? b. Is this steam super heated or saturated? c. If this steam issuper heated, what is its degree o…

a.When atoms are brought together in a solid, _________________________ interact

a.When atoms are brought together in a solid, _________________________ interactions cause energy levels to split into closely spaced states known as ____________________. b.The _…

a.When atoms are brought together in a solid, _________________________ interact

a.When atoms are brought together in a solid, _________________________ interactions cause energy levels to split into closely spaced states known as ____________________. b.The _…

a.Write balanced molecular and ionic equations for eachreaction of a solid with

a.Write balanced molecular and ionic equations for eachreaction of a solid with HCl. HCl + CaCO3 HCL + precipitate form Ni(NO3)2 +NaOH b. Write balanced molecular and ionic equati…

a.Write the dissolution of NaI into water. b. In this cell,there are two possibl

a.Write the dissolution of NaI into water. b. In this cell,there are two possible oxidation reactions that might occur. Write two half reactions and their corresponding potential …

a.import java.awt.*; import java.awt.event.*; import javax.swing.*; public class

a.import java.awt.*; import java.awt.event.*; import javax.swing.*; public class JFontSizes extends JFrame implements ActionListener {      JButton button = new JButton("Press Me"…

a.particular reaction has an activation energy of 11.3 kj mol. what is the rate

a.particular reaction has an activation energy of 11.3 kj mol. what is the rate concentration for the reaction at 373 K if the rate.constant for the same reaction is 8.3 10-4 s-1 …

a1b43 Ch. 10 (Hybridization and How to take a Screenshot x CCh.10 (Hybridization

a1b43 Ch. 10 (Hybridization and How to take a Screenshot x CCh.10 (Hybridization and Delocalized Bonds) and Ch. 6 Thermochemistry[1430865861957 Chemistry 1320: Spring 2015 Allison…

a1s. whic h one of the following atoms is in order of increasing atomic radn Ue

a1s. whic h one of the following atoms is in order of increasing atomic radn Ue from lowest to highest rodin? Q16. Which one of the following electron configurations obeys Hund's …

a20. A hybrid sandwich to sustain bending loads andwith face thickness,t-5mm and

a20. A hybrid sandwich to sustain bending loads andwith face thickness,t-5mm and total thickness of 30cm, s esiened panel X, with face thickness, t-5mm and total thickness of 30cm…

a4: (1) Balance the following reaction; (2) Wh bromide are mixed? Or in the othe

a4: (1) Balance the following reaction; (2) Wh bromide are mixed? Or in the other word, derive a net ionic reaction equation from the re at net ionic reaction occurs when aqueous …

aA + 6B cC + dD the equilibrium equation is given by K1 = [C]c[D]d / [A]a [B]b T

aA + 6B cC + dD the equilibrium equation is given by K1 = [C]c[D]d / [A]a [B]b Thus, for a chemical reaction equation with the general form cC + dD eE + fF the equilibrium equatio…

aFeS 2 + bH 2 O + cO 2 ®dFe 2+ +eH + + fSO 4 2- Derive the coefficients a, b, c,

aFeS2 + bH2O + cO2 ®dFe2+ +eH+ + fSO42- Derive the coefficients a, b, c, d, e, and f inreaction aFeS2 + bH2O + cO2 ®dFe2+ +eH+ + fSO42- Derive the coefficients a, b, c, d, e, and …

aVisit this PhET density simulation (http://openstaxcollege.org/l/16phetmasvolde

aVisit this PhET density simulation (http://openstaxcollege.org/l/16phetmasvolden) and select Custom Blocks and then My Block. (a) Enter mass and volume values for the block such …

aa Sapling Learning Nitrogen and hydrogen combine at high temperature, in the pr

aa Sapling Learning Nitrogen and hydrogen combine at high temperature, in the presence of a catalyst, to produce ammonia. Assume 4 molecules of nitrogen and 9 molecules of hydroge…

aademiCHCHM 2024/2017 20-CHM 2024-01/Coursewor rsework. Take Test Vie Edit View

aademiCHCHM 2024/2017 20-CHM 2024-01/Coursewor rsework. Take Test Vie Edit View Favorites ×19 Two benzaldehyde molecules Tools Help Multiple Choice P Chapter 10 Microbiology.. Ald…

aas For which one of the following does chtorine have does an oxidation number o

aas For which one of the following does chtorine have does an oxidation number of zero? A Cl 027. in the reaction, CosNiO element is reduced? A. Co B. Ni azs 10g of Nac is diss so…

ab 3: Separation of the Pigments in Spinach by Thin Layer Chromatography 2. Expl

ab 3: Separation of the Pigments in Spinach by Thin Layer Chromatography 2. Explain the effect on the Ry values if the surface of the plate is broken while drawing the pencil line…

abdull Question How many significant figures are there in the answer to the foll

abdull Question How many significant figures are there in the answer to the following Not yet answered (1.10 x 0.5120 x 4.0015) 3.4555 Points out of 5.00 Answer: P Flag question Q…

able 5.1 PURIFICATION OF A TARGET PROTEIN USING A COMBINATION OF BIOCHEMICAL MET

able 5.1 PURIFICATION OF A TARGET PROTEIN USING A COMBINATION OF BIOCHEMICAL METHODS Total units of activity MutifoldTotal activity increase in yield (%r Specific Totalmultfold To…

able 5.1 PURIFICATION OF A TARGET PROTEIN USING A COMBINATION OF BIOCHEMICAL MET

able 5.1 PURIFICATION OF A TARGET PROTEIN USING A COMBINATION OF BIOCHEMICAL METHODS Total units of activity MutifoldTotal activity increase in yield (%r Specific Totalmultfold To…

able: Look over these statements about the chemical elements in one or more main

able: Look over these statements about the chemical elements in one or more main-block groups of the Periodic T Elements in this group react with oxygen to form basic oxides. Elem…

able: Look over these statements about the chemical elements in one or more main

able: Look over these statements about the chemical elements in one or more main-block groups of the Periodic T Elements in this group react with oxygen to form basic oxides. Elem…

aboratory 3 Factors Which Influence the Rate of Reaction DATE. SECTION: Post-Lab

aboratory 3 Factors Which Influence the Rate of Reaction DATE. SECTION: Post-Lab Questions urn in to your instructor with the post laboratory report for this experiment.) 1. When …

aboratory 7 Ionization & Classification of Acids, Bases and Salts NAME: DATE: IN

aboratory 7 Ionization & Classification of Acids, Bases and Salts NAME: DATE: INSTRUCTOR: SECTION: WORKSHOP: CONDUCTIVITY OF SOLUTIONS. Answer the following questions during t…

aboratory 8 Acid-Base Titration Determination of the Concentation of an Unknown

aboratory 8 Acid-Base Titration Determination of the Concentation of an Unknown Acid Solution NAME DATE INSTRUCTOR SECTION: IN-LAB GUIDELINES This is a guide to allow you to prepa…

aboratory Assignment ts of the 3. A student performed an experiment similar to t

aboratory Assignment ts of the 3. A student performed an experiment similar to the ware f one that you will perform but used different solutions. ly comThe student's data are pres…

about ipv4 header:- a) The IPv4 header has two length fields. Which are they and

about ipv4 header:- a) The IPv4 header has two length fields. Which are they and what are the purposes and limitations of each? (2p) b) What is the purpose of the TTL (time-to-liv…

about small quantity of solid KBr to a small, clean test tube. Into the test-tub

about small quantity of solid KBr to a small, clean test tube. Into the test-tube add 1 of cyclohexane and 0.5 ml, of water, Shake the test-tube and note the appearance of the cyc…