1. Find the MSDS for potassium chlorate. a) Are there any health
hazards associated with this material, and what conditions produce
these hazards?
b) Under what conditions does it produce fire or explosion
hazards?
c) Since this experiment involves high temperatures, what are the
melting point and decomposition temperature for potassium chlorate?
melting temperature _________ decomposition temperature
_________
d) Based on these values, what will you see happening to the
potassium chlorate solid as you begin heating it to high
temperatures
In: Chemistry
A chemist at a pharmaceutical company is measuring equilibrium constants for reactions in which drug candidate molecules bind to a protein involved in cancer. The drug molecules bind the protein in a 1:1 ratio to form a drug-protein complex. The protein concentration in aqueous solution at 25 ∘C is 1.58×10−6 M . Drug A is introduced into the protein solution at an initial concentration of 2.00×10-6 M. Drug B is introduced into a separate, identical protein solution at an initial concentration of 2.00×10-6 M. At equilibrium, the drug A-protein solution has an A-protein complex concentration of 1.00×10-6 M, and the drug B solution has a B-protein complex concentration of 1.40×10-6 M.
Part A: Calculate the Kc value for the A-protein biding reaction.
Part B: Calculate the Kc value for the B-protein biding reaction.
Part C: Assuming that the drug that binds more strongly will be more effective, which drug is the better choice for further research?
In: Chemistry
Calculate the pH of 6.6 × 10-8 M HCl. Report your answer to the hundredths place.
In: Chemistry
What is the change in pH when 10.0 mL of 0.250 M KOH (aq) is added to 100.0 mL of a buffer that is 0.150 M in HCOOH (aq) and 0.100 M in HCOO– (aq)? pKa = 3.75 for HCOOH (aq).
Select one:
a. –0.26 pH unit
b. +0.18 pH unit
c. +0.00 pH unit
d. –0.81 pH unit
QUESTION 2
What is the molarity of an aqueous barium hydroxide solution if it takes 59.9 mL of 0.100 M HCl (aq) to neutralize 21.6 mL of the Ba(OH)2 (aq) solution?
Select one:
a. 0.208 M
b. 0.277 M
c. 0.139 M
d. 0.0693 M
In: Chemistry
Given a solution of 0.125 M CH3COOH (aq) and a solution of 0.150 M NaCH3COO (aq), how would you prepare 100.0 mL of a buffer solution with a pH of 4.400? pKa = 4.740 for CH3COOH (aq).
Select one:
a. Mix 68.6 mL of the CH3COOH (aq) with 31.4 mL of the NaCH3COO (aq)
b. Mix 27.6 mL of the CH3COOH (aq) with 72.4 mL of the NaCH3COO (aq)
c. Mix 72.4 mL of the CH3COOH (aq) with 27.6 mL of the NaCH3COO (aq)
d. Mix 50.0 mL of the CH3COOH (aq) with 50.0 mL of the NaCH3COO (aq)
QUESTION 2
If 15.9 grams of NH4Cl (s) are added to 250.0 mL of 0.350 M NH3 (aq) solution, what is the resulting pH? Assume no change in volume upon adding the NH4Cl (s). pKa = 9.25 for NH3 (aq).
Select one:
a. 8.55
b. 8.38
c. 9.06
d. 8.72
In: Chemistry
A mixture is made by combining 11.5 mL of 8.5×10−3 M KSCN, 6.3 mL of 3.7×10−2 M Fe(NO3)3, and 10.4 mL of 0.397 M HNO3. Calculate the concentraion of Fe3+ in the solution.
In: Chemistry
1. Assume that the rate law for a reaction is rate = k[A][B]^2
a) what is the overall order of the reaction?
b) if the concentration of both A and B are doubled, how will this affect the rate of the reaction?
c) how will doubling the concentration of A, while the concentration of B is kept constant, affect the value of k (assume that temperature does not change)? how is the rate affected?
2. It is found for the reaction 2A + B ---> C that doubling the concentration of either A or B while maintaining the other concentration constant quadruples the reaction rate. Write a rate law for the reaction.
In: Chemistry
Given the E0 values of the following two half-reactions:
Zn à Zn2+ + 2e- E0 = 0.763 volt
Fe à Fe2+ + 2e- E0 = 0.441 volt
a)Write a balanced complete oxidation-reduction reaction?
b)Explain whether the corrosion of an iron pipe (i.e., Fe Fe2+) in the presence of Zn/Zn2+ is possible or not (thermodynamically)?
c)Explain whether or not Zn will protect the corrosion of iron pipe if metallic Zn is in contact with the iron pipe?
In: Chemistry
In a experiment, 1 ml of .01 M KMnO4 plus 6 drops of 6 M H2SO4 are added together with drops of 0.1 M FeSO4 until change occurs. The color changed from purple to a clear solution. What is the oxidizing agent and reducing agent ? The balanced net ionic equation with 1/2 reactions? Thank you.
In: Chemistry
Based on material science and diffusion, how is beef marinated? This question was given by my professor as a way to apply diffusion to the real world and if you can give me a basic understanding that would be awesome. Thank you.
In: Chemistry
Given the following pairs of half-reactions, please construct a complete balanced oxidation-reduction reaction for each pair of two half-reactions:
a) H2= 2H+ + 2e-
Fe2+= à Fe3+ + e-
b) 1/4O2(g) + H++ e- == ½ H2OH2 =à 2H++ 2e-
C) 2IO3-+ 12H++ 10e-== I2+ 6H2O 2I-= I2+ 2e-
In: Chemistry
Calculate the change in pH to 0.01 pH units caused by adding 10. mL of 3.69-M NaOH is added to 530. mL of each of the following solutions.
a.) water
pH before mixing: 7.00 (correct)
pH after mixing: ??
b.) 0.180 M NH3
pH before mixing: 11.26
pH after mixing: ??
Thank you! Sincerely, a confused college student
In: Chemistry
State the dominant intermolecular forces for the following substances:
iron(III)chloride
phosphorous trichloride
boron trichloride
BeH2
H2O
XeF2
PH3
CrCl3
SF2
CS2
In: Chemistry
Calculate the pH of each of the solutions and the change in pH to 0.01 pH units caused by adding 10.0 mL of 3.63-M HCl to 440. mL of each of the following solutions.
a.) .181 M C2H3O2 1-
ph before mixing: 9.00 (correct)
pH after mixing: ??
b.) a buffer solution that is 0.181 M in each C2H3O2 1- and HC2H3O2
pH before mixing: ??
pH after mixing: ??
Thank you!! Sincerely, a confused college student
In: Chemistry
A mixture of carbon dioxide and nitrogen gases, in a 7.69 L flask at 36 °C, contains 10.4 grams of carbon dioxide and 7.77 grams of nitrogen. The partial pressure ofnitrogen in the flask is (?) atm and the total pressure in the flask is (?) atm
thanks in advance
In: Chemistry