5 Steps to a 5 AP Chemistry 2019

362 ❯ STEP 5. Build Your Test-Taking Confidence

(c) The reaction in (b) went to completion; however, the volume of gas generated was lower than expected.

Explain why the volume was low.

(d) In the box below, draw the Lewis electron-dot structure for HCN.

150

Boiling points of hydrogen compounds of the p-block elements

234

Period

5

Group 16

Group 15

Group 17

100

50

0

°C

–50

–100

–150

–200

Question 5

Answer each of the following with respect to the plot of the boiling points of the hydrogen compounds

in the above graph. Group 15 is the nitrogen family, Group 16 is the oxygen family, and Group 17 is the

halogen family.

(a) On the above plot draw a line to indicate the boiling points of the hydrogen compounds in Group 14

(carbon family).

(b) What is the cause of the upward turn in the three lines shown on the graph?

(c) Where would the compound LiH appear on this graph, and why would it appear in this position?

Question 6

Five beakers (A–E) are on a countertop. Each contains 200 mL of a 0.10 M solution. Beaker A contains

SrCl 2 ; beaker B contains NH 4 Cl; beaker C contains CH 3 CH 2 OH; beaker D contains Na 2 C 2 O 4 ; and

beaker E contains Ni(NO 3 ) 2.

(a) Which beaker has the lowest pH and why?

(b) Which solution is most likely to be colored?

(c) Which solution is basic?

(d) Which solution has the lowest electrical conductivity and why?

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