We will abbreviate Malonic acid, CH2(CO2H)2 as H2M. Find the pH and concentrations of H2M, HM-, and M^2- in a) .1 M H2M b) .1 M NaHM c) .1 M Na2M

An electrochemical cell is based on the following two half-reactions:
Ox: Pb(s)→Pb2+(aq, 0.19 M )+2e−
Red:MnO−4(aq, 1.65 M )+4H+(aq, 1.9 M )+3e−→
MnO2(s)+2H2O(l)

Compute the cell potential at 25 ∘C.

Which transition metal is correctly matched with its highest oxidation state??

A) Cr, 3+?

B) Mn, 5+?

C) Ti, 3+

?D) Sc, 3+

?E) Fe, 8+

Calculate the concentration of all species in a 0.175 M solution of H2CO3.

[H2CO3], [HCO?3], [CO2?3], [H3O+], [OH?]

Consider the reaction

Mg(s)+Fe2+(aq)→Mg2+(aq)+Fe(s)

at 69 ∘C , where [Fe2+]= 3.10 M and [Mg2+]= 0.110 M .

a)What is the value for the reaction quotient, Q, for the cell?

b) What is the value for the temperature, T, in kelvins?

c) What is the value for n?

d) Calculate the standard cell potential for Mg(s)+Fe2+(aq)→Mg2+(aq)+Fe(s)

A solution contains 1.20×10-2 M zinc acetate and 8.67×10-3 M copper(II) nitrate.
Solid potassium sulfide is added slowly to this mixture.

A. What is the formula of the substance that precipitates first?

formula =_____________

B. What is the concentration of sulfide ion when this precipitation first begins?
[S2-] =____________ M
  

Consider these reactions, where M represents a generic metal.

1. 2M(s)+6HCl(aq) >>> 2MCl3(aq)+3H2(g)

Delta H1=-752.0 kJ

2. HCl(g) >>> HCl(aq)

Delta H2= -74.8 kJ

3. H2(g)+Cl2(g) >>> 2HCl(g)

Delta H3= -1845.0 kJ

4. MCl3(s) >>> MCl3(aq)

Delta H4= -347.0 kJ

Use the information above to determine the enthalpy of the following reaction.

2M(s)+3Cl2(g) >>> 2MCl3(s)

Delta H= ?kJ

1) When 0.119 g of Zn(s) is combined with enough HCl to make 51.6 mL of solution in a coffee-cup calorimeter, all of the zinc reacts, raising the temperature of the solution from 22.4 ∘C to 23.9 ∘C. Find ΔHrxn for this reaction as written. (Use 1.0 g/mL for the density of the solution and 4.18 J/g⋅∘C as the specific heat capacity.)

2)Calculate ΔHrxn for the following reaction:

CaO(s)+CO2(g)→CaCO3(s)

Use the following reactions and given ΔH values:

Ca(s)+CO2(g)+12O2(g)→CaCO3(s), ΔH= -812.8 kJ
2Ca(s)+O2(g)→2CaO(s), ΔH= -1269.8 kJ

Please give explanation.

Consider the titration of 100.0 mL of 0.200 M CH₃NH₂ by 0.100 M HCl.
For each volume of HCl added, decide which of the components is a major species after the HCl has reacted completely.
K_b for CH₃NH₂ = 4.4 x 10^-4.

200.00 mL HCL added    yes no  H+ yes no  H2O yes no  Cl- yes no  CH3NH2 yes no  CH3NH3+

300.00 mL HCL added:

yes no  H⁺
yes no  H₂O
yes no  Cl^-
yes no  CH₃NH₂
yes no  CH₃NH₃⁺

Calculate the pH at the equivalence point for this titration?

At what volume of HCl added in this titration does the pH = 10.64? Express your answer in mL and include the units in your answer?

Using values from Appendix C of your textbook, calculate the value of Keq at 298 K for each of the following reactions:

(A) 2 NO(g) N2(g) + O2(g)

(B) 3 NO(g) NO2(g) + N2O(g)

(C) 2 HI(g) H2(g) + I2(g)

Appendix C page screenshots are below:

http://i.imgur.com/fHg7YIC.png

http://i.imgur.com/nGvqHNp.png

http://i.imgur.com/YPDGm2N.png

Write down the balanced net ionic equation

Permanganate ion reacts with thiosulfate ion in acidic condition to produce Mn2+ ion and sulfate ion.

Explain if true or false. We can always use 22.4 as a proportionality between moles of gases within reactions, regardless of the conditions of the surroundings.

1. A 70 kg adult male is exposed to 0.001 ppmv of vinyl chloride (C2H3Cl) in the air at his workplace. Note: this is far below the permissible exposure limit set by OSHA (1 ppmv).

a) Calculate this man’s lifetime cancer risk from this inhalation exposure. Assume temperature and pressure conditions of 20°C and 1 atm. Use exposure factors given in Table 6.14, and the slope factor = 0.295 (mg/kg ・ day)^-1.

b) If this man wants to limit his lifetime cancer risk from inhalation exposure to vinyl chloride to 10^-6, how many years could you work at this job?

Which of the following species cannot act as a Lewis base?

a) S²

the proteins containing the following amino acids

61 LYS     12 SER      25 MET

22 HIS      75 GLU     56 ILE

29 ARG     45 PRO     83 LEU

77 ASP   67 GLY   26 TYR

24 TR       65 ALA      47 PHE

71 VAL

A) what its net charge at PH 1

b) What is net charge at ph 13

c) calculate the pI?