april 12 aamc chem practice qs

Which of the following shows the electron configuration of chlorine in NaCl? 1s22s22p63s23p4 1s22s22p63s23p5 1s22s22p63s23p6 1s22s22p63s23p44s2

C In NaCl, chlorine exists as the chloride ion. A chloride ion has 18 electrons with the electron configuration 1s22s22p63s23p6. Thus, C is the best answer.

T/F the volume of a gas depends only on the number of moles of a gas present and it's identity.

False, no no no! volume only depends on the number of moles of the gas present, not on the identity.

What species is the reducing agent in Equation 2? 2 Ag(s) + H2S(aq) → Ag2S(s) + H2(g) S2- H2S H+ Ag

In an oxidation-reduction reaction, the reducing agent donates electrons and is thus oxidized. In equation 2, metallic silver (Ag0) is oxidized to the +1 state in Ag2S. Silver is oxidized in the reaction, so it is the reducing agent. Answer choice D is the correct answer.

How can you tell if a gas will have ahigher or lower boiling point?

Look at the number of moles of gas, also look for which gas has higher molecular wt

why is water excluded from equilibrium constant expressions?

water is omitted because it is the solvent, the concentration of water stays essentially constant throughout the reaction