a) Determine whether or not the following nuclide is likely to be stable: Hg-199. Why

b) Determine whether or not the following nuclide is likely to be stable: Y-88. Why?

What metals are used in costume jewelry? How are they made to simulate the gold and silver they mimic?

Thermochemistry of Chemical Reactions

Bond Energies and Enthalpy

1) For an exothermic reaction, which molecules have a greater amount of energy within their bonds, reactants or products? Explain your answer.

2) How much energy would be released by the combustion of 5.00 moles of ethanol?

3) What is the Delta H(reactions) for the synthesis of ammonia?

4) How much energy is produced by the synthesis of two moles of ammonia?

Nitrosyl bromide (NOBr) can be obtained as a pure liquid at low temperatures. The liquid boils at –2°C, and at room temperature the gas partially decomposes, as shown below. 2 NOBr(g) Á 2 NO(g) + Br2(g) A 2.00-g sample of cold liquid NOBr is injected into a 1.0 L flask. (Assume that the flask was first evacuated so that it does not contain any air or other gases.) When the flask is allowed to come to equilibrium at 298 K, the total pressure inside is measured as 0.624 atm. (5 pts) (a). Calculate the total number of moles of gas present in the flask at equilibrium. (This part should be easy!) (b). Now find the numerical value of Keq for the reaction above at 298 K. (HINT: Set up the usual equilibrium table, and then try to relate the final concentrations to the total number of moles you found in part

I need to prepare a standard calibration curve for gamma globulin. absorbances on Y and mg of standard protein per assy on X. used .125mg/ml gamma stock for tubes 2-6. (Water (ml), gamma (ml), Abosrbance)--> (.9, .1, .587) (.8, .2, .672) (.6, .4, .602) (.4, .6, .895) (.2, .8, .987) - I"m not getting a straight line. I know in class we did a 1:10 dilution. What is the math and how do you get the standard curve?

If a total of 13.5 mol of NaHCO3 and 4.5 mol of C6H8O7 react how many moles of CO2 and Na3C6H5O7 will be produced? 3NaCO3(aq)+C6H8O7- ->3CO2(g)+3H2O(s)+Na3C6H5O7(aq)

Part A

The reactant concentration in a zero-order reaction was 5.00×10⁻²M after 130 s and 4.00×10⁻²M after 310 s . What is the rate constant for this reaction?

Express your answer with the appropriate units.

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Part B

What was the initial reactant concentration for the reaction described in Part A?

Express your answer with the appropriate units.

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Part C

The reactant concentration in a first-order reaction was 9.20×10⁻²M after 40.0 s and 8.20×10⁻³M after 95.0 s . What is the rate constant for this reaction?

Express your answer with the appropriate units.

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Part D

The reactant concentration in a second-order reaction was 0.130 M after 295 s and 6.60×10⁻²M after 900 s . What is the rate constant for this reaction?

Express your answer with the appropriate units. Include an asterisk to indicate a compound unit with mulitplication, for example write a Newton-meter as N*m.

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There are 10 errors in the listed reference. Please find the 10 errors and rewrite the citation, using APA style.

Jones, D. R. & Doe, Jane. (2003) Reactions Of enzymes in everyday Life. Journal of Chemistry, volume 23, issue 7, 42-50. DOI: 10.1026/rkt.1062.

At very high temperature can following reaction occur.

2 CrSO₄(s) ↔ Cr₂O₃(s) + SO₂(g) + SO₃(g)

Rate constant (K_p) is 0,36 with some temperature. In some experiment a CrSO₄ is put in some container were partial pressure of SO₃ is 1,00 atm. What is partial pressure of SO₂ at equilibrium?

For a given reaction, the heat capacity (CP) of the reactants is 50.0 J/mol K and for the products is 65.0 J/mol K. If the enthalpy of reaction is − 150.0 kJ/mol at 300K, what is the best estimate of ΔrxnH at 320K?

The reaction in the previous question is carried out adiabatically starting at 300 K. What is the final temperature after the reaction goes to completion?

Δ_rxnH₃₀₀ = -150.0 kJ/mol

C_P(reactants) = 50 J/molK

C_P(products) = 65 J/molK

T_f = ? K

What relative masses of dimethyl amine and dimethyl ammonium chloride do you need to prepare a buffer solution of pH = 10.58?

units of answer should be: g of(CH3)2NH per 1g (CH3)2NH2Cl

Calculate the Ka of if 5.0 M HF, 2.7% dissociated:

a) Dissociation equilibria:

b) ICE setup:

c) Amount dissociated:

d) Ka:

12. Calculate the [H+], [OH-] and pH of 0.90 M HC2H3O2; Ka= 1.8 x 10-5.

a) Dissociation equilibria:

b) ICE setup:

c) [H+] and [OH-]:

d) pH:

13. Calculate the [H+], [OH-] pOH and pH 5.0 M NH3; Kb= 1.8 x 10^-5

a) Dissociation equilibria:

b) ICE setup

c) [H+] and [OH-]:

d) pOH and pH

1) The vapor pressure of benzene, C6H6, is 100.0 torr at 26.1 ∘C. Assuming Raoult’s law is obeyed, how many moles of a nonvolatile solute must be added to 100.0 mL of benzene to decrease its vapor pressure by 10.0% at 26.1 ∘C? The density of benzene is 0.8765 g/cm3.

2) Which of the following actions will raise the osmotic pressure of a solution?

What answer should be reported, with the correct number of significant figures, for the following calculation? (249.362 + 41)/63.498 Please explain the significant figures portion.

Given the values of ?H?rxn, ?S?rxn, and Tbelow, determine ?Suniv. Also, predict whether each reaction will be spontaneous or nonspontaneous

A)?H?rxn= 86kJ , ?Srxn= 142J/K , T= 308K

Express your answer using two significant figures.

B)?H?rxn= 86kJ , ?Srxn= 142J/K , T= 762K

Express your answer using one significant figure.

C)?H?rxn= 86kJ , ?Srxn=? 142J/K , T= 308K

Express your answer using one significant figure.

D)?H?rxn=? 86kJ , ?Srxn= 142J/K , T= 404K

Express your answer using one significant figure.