Which metal can react with an acid? Cu, Ag, Al, Au (Answer is Al) Can someone explain why?

1) A 0.23 g sample of an unknown monoprotic acid is titrated with 0.11 N NaOH. 23.89 mL of NaOH is required to reach the equivalence point. What is the molar mass of this acid?

2) You perform a phenolphthalein titration on a 0.26 g sample of an unknown organic acid, which requires 33.78 mL of 0.1008 N NaOH to reach the endpoint.

a) What is the equivalent weight (estimate) for this acid?

b) Assume the acid is monoprotic and calculate its molar mass. Assume the acid is diprotic and calculate its molar mass. Now that you have two potential molar mass values, using the list of acids in the lab, do you think this acid is monoprotic or diprotic? Explain your rationale.

Insulin sequence As reported in 1945, Sanger reacted insulin with FDNB and hydrolyzed the resulting protein. He found many free amino acids, but only three DNB-aa

why is proline isomerization often a rate limit step in protein folding? Explain

Write the half reaction for the anode and cathode for the following electrochemical cells. which metal acts as the anode and which acts as the cathode. For each cell, combine the half reactions and write the overall cell reaction.

a. Zn/Cu

b. Fe/Cu

c. Mg/Cu

d. Pb/Cu

e. Sn/Cu

A 1.0 m³ tank, initially filled with 103. kPa, 300. K air, is connected to a source of air at 1,500. kPa, 300. K. The tank slowly fills until it is at the same pressure. If the temperature is maintained at 300. K throughout this transient process, what is the total heat transfer required? (You can assume air is an ideal gas.)

A 10.0-g sample of solid NH4Cl is heated in a 5.00-L container to 900.

N3-, ClO4-, TeO3, Cl20, CO32-, C2H4Cl2, C2H4, P4,

For the following compounds, please identify

1) How many lone pairs it possess

2) What is the shape about the central atom?

3) Is the molecule polar?

4) How many isomers or resonance structures (apart from the original) does the compound possess?

For each bond, show the direction of polarity by placing a + sign next to the atom expected to have a partial positive charge and a − sign next to the atom expected to have a partial negative charge.

(A) _?__ Te-S __?__

(B) _?_ O-Te __?__

(C) _?__ O-S _?__

The most polar bond is ____ (A,B, or C)

For each bond, show the direction of polarity by placing a + sign next to the atom expected to have a partial positive charge and a − sign next to the atom expected to have a partial negative charge.

(A) __?__ Te-Se __?___

(B) _?__ O-Te __?_

(C) __?__ O-Se __?__

The most polar bond is ____ (A,B, or C)

Identify whether the following statement is true or false. Circle your answer choice. If the answer is false, correct the statement to make it true.

True / False The solubility of silver hydroxide will increase in a basic solution.

True / False An indicator is a weak organic acid that changes color in solution depending on the protonation state

True / False Solubility product constants are large for insoluble salts.

True / False The equation that will correspond to the solubility of the salt, MX3, in water is K_sp = 27x⁴

True / False A Lewis acid is the proton donor.

True / False A strong oxidizing agent has a high reduction potential

True / False Lead will oxidize first in a mixture that contains lead (E_red = −0.13 V) and zinc (E_red = −0.76 V) metals.

Part A: What mass of carbon dioxide is present in 1.00 m3 of dry air at a temperature of 19?C and a pressure of 651torr? Express your answer with the appropriate units.

Part B: Calculate the mass percentage of oxygen in dry air. Express your answer with the appropriate units.

If you could explain how you got your answer that would be great! Thank you!

Here is given info:

Air is a mixture of several gases. The 10 most abundant of these gases are listed here along with their mole fractions and molar masses.

What are two factors that a GC column uses to separate compounds?