Chem Test 2

What is the electronic configuration for Sulfur (S) (include the noble gas configuration) 16S

[Ne]3s²3p^4

200 mL of 0.225 M Nitric Acid HNO3 (strong acid) are mixed with 100mL of 0.350M NaOH, what would be the final pH?

1.48 pH

pyruvate is reduced, NADH is oxidized

When electrons are sent through the double slit one at a time, and both slits are open and unobserved, what can be concluded about the path of any single electron?

It is impossible to determine which slit each electron passes through, even in principle.

Explain from energetic/stability perspective, what determines if an acid is strong acid of a weak acid, possibly draw a diagram to illustrate.

-3331 kJ/mol of Pentanol

Why is entropy not really disorder but confused as such and how is the entropy of the universe related to free energy?

Entropy (TdeltaS) is all the products that can take place but seem random. DeltaS univ is greater than 0 so it must increase

When table salt dissolves in water, what is the primary thermodynamic variable and why?

DeltaH for most solids dissolving in water is positive which isnt favorable. Entropy overwhelms deltaH and makes deltaG negative so it becomes very soluble in many cases

T/F oxidation is always accompanied by reduction in a reation

T

T/F oxidation is an increase in oxidation number

T

T/F Oxidation is a “gain” of electrons

F

T/F A gain of an oxygen to a compound is required for oxidation

F, not required

T/F Oxidation is the combination with O atoms to form O2

F

T/F Molecular oxygen is typically oxidized during the oxidation process

F, not oxidized

T/F A gain of oxygens in a reaction is an indication of Reduction

F

T/F A loss of oxygens in a reaction is an indication of Reduction

T

T/F reduction is the loss of electrons

T

T/F Redox reactions require that the energy of the products be higher that the energies of the reactants

T

30mg of Ca(OH)2 is dissolved in 1L of water at 298k, what is its pH?

10.91

Hydrogen has is enclosed in a cubic vessel with dimensions of 11cm on a side at pressure of 735 torr and temperature of 25C. How many moles were present? What would be the pressure if the vessel were compressed to half its volume?

0.0526 moles

The pressure would be double at half volume 1.93 atm

0.279 M

62.24 years

32169.98 years

25.8 days

17.32 seconds

Describe how you would make up 500 mL of a solution of 0.125M K2SO4? (174.26g/mol)

weigh out 10.8913 g of K2SO4 and transfer to 0.5L volumetric. Add 100 mL of water and dissolve all of the solid. Fill the volumetric to the line

What would be the concentration of Potassium in the solution?

2(0.125) = 0.250 M [K+] - concentration = molarity

What is the concentration of H3O+ and OH- in a solution which has a pH=6? What is the pOH of the solution?

[OH-] = 10^-8M

What is the concentration of H3O+ and OH- in a solution which has a pH=3.2?

100 mL of 0.15M HCl is added to 200mL of 0.15M NaOH, what is the final pH of the solution?

Consider the reaction 3A+2B ==== C+4D

What is the equilibrium constant for this reaction? If the value of this Keq is small what does this mean?

if small it means that few products are made

Why is the pH of a neutral solution at 298K equal to 7? include thermo

What are hte definitions of Enthalpy (H) and internal energy (E) and when is delta