Answers and Explanations for Practice Exam

(E) Atoms get bigger as you go down groups. The reason is that principal energy levels of electrons are being added. Leaving the noble gases out, atoms get smaller as you go across a period. 

(A) The carbon of carbon dioxide has two double bonds. Because there are no unshared pairs of electrons on the central carbon atom, VSEPR theory predicts a linear molecular geometry (type AX2). 

05 moles would be the maximum amount that would react completely with the given amount of the weak base moles C2H302 = (0.50 L) (0.10 M) = 0.050 moles. Because the acid and base react in a 1 1 mole ratio, 

(A) The greater the disorder of the system, the larger the entropy. There is an increase in the number of particles and thus greater disorder. 

(A) Entropy increases upon expansion. The molecules under 1.0 atm of pressure are freer to move around. They are less constricted. 

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