Consider the cell described below at 291 K:

Sn | Sn²⁺ (0.753 M) || Pb²⁺ (0.921 M) | Pb

Given E^o_Pb²⁺→Pb = -0.131 V, E^o_Sn²⁺→Sn = -0.143 V. Calculate the cell potential after the reaction has operated long enough for the Sn²⁺ to have changed by 0.325 mol/L.

For BIOCHEM

1. When we refer to "anabolic" biochemical reactions, what do we mean? Give an example of an anabolic reaction. (You can describe in words, you dont need to show a balanced reaction).

2. Stage 1 of metabolism refers to the beginning of deigestion of carbohydrates, fats and proteins. Where do proteins begin stage 1 digestion? What happens at the beginning of Stage 1 digestion of proteins?

3. Which coenzymes serves as an oxidizing agent in glycolysis?

4. Write the net reaction for glycolysis.

why is proline more hydrophilic than all of the other hydrophobic amino acids? ( need to consider the electronegativity of nitrogen and carbon and then carefully look at proline's structure in relation to other hydrophobic amino acids

Which of the following compounds are insoluble in water?

aluminum hydroxide

lithium chloride

sodium phosphate

lead(II) bromide

A student mixes 31.0 mL of 3.24 M Pb(NO3)2(aq) with 20.0 mL of 0.00217 M NaI(aq). How many moles of PbI2(s) precipitate from the resulting solution? What are the values of [Pb2 ], [I–], [NO3–], and [Na ] after the solution has reached equilibrium at 25 °C?

what is heavy metal contamination

Construct a curve for the titration of 50.00 mL of a 0.1000 M solution of ethylenediamine with a 0.2000 M solution of HCl in the following table. For each titration, calculate the pH after the addition of 0.00, 12.50, 20.00, 24.00, 25.00, 26.00, 37.50, 45.00, 49.00, 50.00, 51.00, and 60.00 mL of HCl.

A mixture of 8-hydroxyquinoline complexes of aluminum and magnesium weigh 1.0843 g. When ignited in a furnace open to the air, the mixutre decomposed, leaving a residue of Al2O3 and Mg weighing 0.1344. What is the weight percent of Al(C9H6NO3) in the original mixture? AlQ3 + MgQ2 ? Al2O3 + MgO

How many of the following responses are true?

1. 3-bromo-3-methylpentane will undergo substitution through an S_N2 mechanism
2. If R-2-bromopentane is allowed to react with OH^- the product will be S-2-pentanol
3. S_N1 leads to a racemization of sterechemistry due to the nucleophile attacking from the backside and the leaving group leaving
4. S_N2 leads to a racemization of sterechemistry due to the nucleophile attacking from the backside and the leaving group leaving
5. A primary alkyl halide will tend to react through an S_N2 mechanism because there is little hindrance to backside attack and a primary carbocation is not very stable

ITEM 17 The decomposition of NH4HS is endothermic:
NH4HS(s)?NH3(g)+H2S(g)

Which change to an equilibrium mixture of this reaction results in the formation of more H2S?

Which change to an equilibrium mixture of this reaction results in the formation of more ?

why is H2O2 added to the precipitate of Fe(OH)3 and Cr(OH)3?

Gasoline is primarily a mixture of hydrocarbons and is sold with an octane rating that is based on a comparison with the combustion properties of isooctane. Gasoline usually contains an isomer of isooctane called tetramethylbutane (C8H18), which has an enthalpy of vaporization of 43.3 kJ/mol and a boiling point of 106.5°C. Determine the vapor pressure of tetramethylbutane on a very hot summer day when the temperature is 38°C.

A. 47.9 torr
B. 67.8 torr
C. 89.3 torr
D. 80.3 torr
E. 36.7 torr

Air (consisting mostly of nitrogen (N2), oxygen (O2), and argon (Ar)) dissolves in water due to?

A. dipole-induced dipole forces.
B. ion–dipole forces.
C. dipole–dipole forces.
D. hydrogen bonding.
E. dispersion forces.

Thanks!

What symbolism do you find in the play,Oedipus?

Consider a buffer system consisting of Benzoic acid (pKa = 4.20) and sodium benzoate,

a) Would this buffer system be an appropriate choice to maintain a pH of 8.5? ues or no

b) To produce a buffer with a pH = 4.55, what mass of sodium benzoate (FM = 104.10) must be dissolved in 500 mL of 0.65 M benzoic acid?

c) What is the resulting pH if 45-mL of 0.08-M HCl is added to 250 mL your buffer?

A 19.34 g mixture of sugar (C12H22O11) and table salt (NaCl) is dissolved in 231 g of water. The freezing point of the solution was measured as -3.84 °C. Calculate the mass percent of sugar in the mixture. Use a list of Kf values.