The activity of an enzyme requires glutamic acid to display its

Balance the following redox equations using the half reaction method:

a. N2H4 + KBrO3 = N2 + KBr + H2O

b. KBrO2 + K2S2O3 + H2O = KBr + K2S4O6 + KOH

c. Zn + HNO3 = Zn(NO3)2 + NH4NO3 + H2O

d. KMnO4 + MnCl2 + KOH = MnO2 + KCl + H2O

e. K2S3O6 + KClO + KOH = K2SO4 + KCl + H2O

Recrystillization Lab:

Suggest one chemical reason, specific to this experiment, why your percent recovery could be less than 100%.

In a titration, 0.140 M HBr is titrated by 0.100 M NaOH. If 16.00 mL of the NaOH titrant is added to 20.00 mL of the HBr solution (followed by mixing), what is the pH of the resulting solution?

Why are water-soluble oils of low volatility not typically isolated by steam distillation?

What is the pH of a solution of 0.20 M HNO2?

Would atomic absorption be a useful technique for determining concentration of benzene in a water sample? Why or why not?

A solution contains [Ba2+] = 5.0 × 10-5 M, [Ag+] = 3.0 × 10-5 M, and [Zn2+] = 2.0 × 10-7 M. Sodium oxalate is slowly added so that [C2O42-] increases. Salt BaC2O4 ZnC2O4 Ag2C2O4 Ksp 1.5 × 10-8 1.35 × 10-9 1.1 × 10-11 What is the concentration of the first cation to precipitate when the second cation just begins to precipitate?

The physical properties of soap depend on the very different water solubility of two ends of tghe same molecule. Normally, soap is the sodium salt of a long-chain carboxylic acid.

A. Explain, using structures and words, the observation that soap does not work properly in very low pH water, or hard water which has calcium and magnesium ions.

B. would a soap make from N,N,N-trimethyl octadecyl ammonium chloride (shown below) have the same problems as a long-chain carboxylic acid? Explain.

CH3-CH2-CH2-CH2-CH2-CH2-CH2-CH2-CH2-CH2-CH2-CH2-CH2-CH2-CH2-CH2-CH2-CH2-N+H3 CL-

Consider the titration of 50.00 mL of 0.100 M trimethylamine ( (CH3)3N, Kb = 6.25 x 10-5) with 0.100 M HI. Calculate the pH at the initial point.

The neutralization of 50.0 mL of 1.00 M hydrochloric acid with 50.0 mL of 1.00 M sodium hydroxide causes a 6.7°C increase in temperature. Predict how the following changes to the experimental protocol would affect the value of the change in temperature.

The temperature change depends on the moles of water produced (moles of reaction) and the mass of the solution. Assume that the density of each solution is 1.0 g/mL.
a. using 100.0 mL of 1.00 M hydrochloric acid and 100.0 mL of 1.00 M sodium hydroxide
b. using 50.0 mL of 2.00 M hydrochloric acid and 50.0 mL of 2.00 M sodium hydroxide
c. using 25.0 mL of 1.00 M hydrochloric acid and 75.0 mL of 1.00 M sodium hydroxide
d. using 25.0 mL of 1.00 M sulfuric acid and 75.0 mL of 1.00 M sodium hydroxide (Be careful. Think about the value of n!)

Consider the titration of a 34.0mL sample of 0.180M  HBr with 0.210M KOH. Determine each of the following:

Part A

the initial pH

Part B

the volume of added base required to reach the equivalence point

Express your answer in milliliters.

for the calculations performed with the experimental data obtained, which of the following best describes why it is necessary to assume that deltaH and deltaS are temperature independent values. this assumption permits use of a linear equation to fit the data, this assumption allows us to average the data, this assumption allows entropy to be ignored when enthalpy changes are large, this assumption allows entropy to be ignored when enthalpy changes are small, this assumption allows entropy to be ignored when calculating deltaG values

H2S + HNO3 ----> H2SO4 + H2O(l) + NO2 (g)

balance in acidic solution, show all steps.