ACS General Chemistry Exam 38 Questions And Answers
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38
Which temperature on the phase diagram of a pure substance represents the normal boiling point of the substance?
very corner
Which property indicates weak intermolecular forces?
low boiling point
Both containers shown below contain the same number of moles of an inert gas. The volume of container A is twice the volume of container B. Which statement best describes the relative pressure of the gas in the two containers?
T= 300 K and T=150 K
T= 300 K and T=150 K
The pressure is the same in both containers because volume and temperature effects cancel.
Which is the largest mass?
1.0 mol He
1.00×106 atoms Ag
0.50 mol H2O
10.0 g Ca
1.0 mol He
1.00×106 atoms Ag
0.50 mol H2O
10.0 g Ca
10.0 g Ca
What volume of 0.200 M HNO3 is needed to react completely with 5.80 g of Ca(OH)2?
Molar mass / g·mol-1Ca(OH)274.1
2HNO3 + Ca(OH)2 Ca(NO3)2 + 2H2O
Molar mass / g·mol-1Ca(OH)274.1
2HNO3 + Ca(OH)2 Ca(NO3)2 + 2H2O
783 mL
Molar mass / g·mol-1C2H4O2-60
C4H6O3-102
C7H6O3-138
C9H8O4-180
Aspirin (C9H8O4) may be synthesized by mixing salicylic acid (C7H6O3) with excess acetic anhydride (C4H6O3). The balanced equation is
C7H6O3 + C4H6O3 C9H8O4 + C2H4O2
When 2.0 g of salicylic acid is mixed with excess acetic anhydride, 1.7 g of aspirin is collected. What is the percent yield for this reaction?
C4H6O3-102
C7H6O3-138
C9H8O4-180
Aspirin (C9H8O4) may be synthesized by mixing salicylic acid (C7H6O3) with excess acetic anhydride (C4H6O3). The balanced equation is
C7H6O3 + C4H6O3 C9H8O4 + C2H4O2
When 2.0 g of salicylic acid is mixed with excess acetic anhydride, 1.7 g of aspirin is collected. What is the percent yield for this reaction?
65%
Suppose an element X occurs naturally to the extent of 20.0% 12X and 80.0% 13X. The atomic mass of X is nearest
12.8
Element X has four valence electrons, is a semiconductor, forms covalent bonds, and is capable of expanding its octet. Element X is most likely
Si
In an atom, orbital I and orbital II must differ in
n
Which set of quantum numbers (n, ℓ, mℓ) corresponds to that of the highest energy electron in a ground state potassium atom?
4, 0, 0