I need help with some explanation with question from oat sample
1. according to the second law of thermodynamics
C any system isolated from an energy sources tends to decrease in entropy
E. any system isolated from an energy source tends toward tis least ordered state
ans is E (i choose c)
2. the muscle cells of the human heart are primarily nourished by
E. blood delivered by the ductus arteriosus
43 for the reaction between A and B to form C it is found that when one combines 0.6 moles of a with 0.6 moles of B, all of the b reacts, 0.2 moles of A remain unreacted and 0.4 moles of C are produced. What is the balance equation for this reaction?
Ans is E 2A + 3B -> 2C
but i think the answer is wrong. I got my answer C 3A + 2B -> 2C
44 if the mass percent of oxygen in a nitrogen-oxygen compound is known, give the mass percent of oxygen, all of the following are needed to determine the molecular formula of a nitrogen-oxygen compound except one.
A. atomic mass of nitrogen
B. atomic mass of oxygen
C. avogadro's number
D. empirical formula
E. molar mass of the compound
Ans : D
have no ideas on this
56. AgCl (s) + 2NH3 ->Ag(NH3)2+ (ag) + Cl- (ag), the equilibrium constant K 4X10^-3, which of the following statement is true? (Ksp for AgCl is 1X10^-10)
A the addition of NH3 decrease the solubility of AgCl
B AgCl is more soluble in aqueous NH3 than in water
C AgCl is more soluble in aqueous solution containing Cl- than in water
D AgCl is less soluble in aqueous NH3 than in water
73
it is believe that an unlabeled bottle containing an unknown liqueid is either 2-pentatnone or 3 - pentanone. What is the best method to distinguish?
A mass spectroscopy
B IR spectroscopy
C 13C NMR spectroscopy
D thin layer chromatography
E melting point determination
ANS C (i choose A)
74
Can someone explain why it is A?
https://www.ada.org/oat/oat_sample_test.pdf
93. what is the hybridization of a nitrogen atom if it forms two alpha and two pi bond?
C sp3
i don't get this, is answer wrong
95
which functional group can act as both a bronsted acid and bronsted base?
B alcohol
i choose D amide
why?
thanks for all your help.
ANS: B
help? please
1. according to the second law of thermodynamics
C any system isolated from an energy sources tends to decrease in entropy
E. any system isolated from an energy source tends toward tis least ordered state
ans is E (i choose c)
2. the muscle cells of the human heart are primarily nourished by
E. blood delivered by the ductus arteriosus
43 for the reaction between A and B to form C it is found that when one combines 0.6 moles of a with 0.6 moles of B, all of the b reacts, 0.2 moles of A remain unreacted and 0.4 moles of C are produced. What is the balance equation for this reaction?
Ans is E 2A + 3B -> 2C
but i think the answer is wrong. I got my answer C 3A + 2B -> 2C
44 if the mass percent of oxygen in a nitrogen-oxygen compound is known, give the mass percent of oxygen, all of the following are needed to determine the molecular formula of a nitrogen-oxygen compound except one.
A. atomic mass of nitrogen
B. atomic mass of oxygen
C. avogadro's number
D. empirical formula
E. molar mass of the compound
Ans : D
have no ideas on this
56. AgCl (s) + 2NH3 ->Ag(NH3)2+ (ag) + Cl- (ag), the equilibrium constant K 4X10^-3, which of the following statement is true? (Ksp for AgCl is 1X10^-10)
A the addition of NH3 decrease the solubility of AgCl
B AgCl is more soluble in aqueous NH3 than in water
C AgCl is more soluble in aqueous solution containing Cl- than in water
D AgCl is less soluble in aqueous NH3 than in water
73
it is believe that an unlabeled bottle containing an unknown liqueid is either 2-pentatnone or 3 - pentanone. What is the best method to distinguish?
A mass spectroscopy
B IR spectroscopy
C 13C NMR spectroscopy
D thin layer chromatography
E melting point determination
ANS C (i choose A)
74
Can someone explain why it is A?
https://www.ada.org/oat/oat_sample_test.pdf
93. what is the hybridization of a nitrogen atom if it forms two alpha and two pi bond?
C sp3
i don't get this, is answer wrong
95
which functional group can act as both a bronsted acid and bronsted base?
B alcohol
i choose D amide
why?
thanks for all your help.
ANS: B
help? please