Question

can someone please explain the answers to this test? i am more concermed about the questions regarding ranking the structures but i am confused anout basically all of them.

1. (24 pts) in the spaces provided, indicate whether the following statements are true (T) or false (F). If the statement is false, provide a 1-2 sentence explanation on why the statement is incorrect When performing simple distillation with a mixture of homogeneous liquids, the temperature read by the thermometer is the same as that in the round bottom flask The temperature read by the thermometion is that of the hot veepors conising. I Taking a melting point of a solid containing pyrene and sodium sulfate will not result in a depression of the observed melting point of pyrene It will result in a depression of the obceived melting point of pyrene ble sodium sulfite is soluble in Pyrene so adding sodium sulfate will be an impunity represented by ad Adding calcium chloride to acetone will lead to a depression of the boiling point of acetone. F u Adding call 'will increase the boiling point of acelone ble it will dissolor its ions will create 16h-dipole moleculan forces C5 The melting point of a pure sample will vary with changes in the atmospheric pressure т î l = ume 2a (4 pts) Based on what was discussed in lab lecture, rank the following compounds in decreasing melting point where 1 has the lowest melting point and 4 has the highest melting point b. (4 pts) Based on what was discussed in lab lecture, rank the following compounds in decreasing boiling point where 1 has the lowest boiling point and 4 has the highest boiling point 3. (18 pts) In one sentence, explain how the items listed below would affect the outcome of the experiment.

Answer 1

Solution:

Melting points increases with increasing molecular masses, while boiling point mainly increases with hydrogen bonding. Thus, a compound having higher molar mass will have higher melting point.

The molecule capable to form strong hydrogen bonding will have highest boiling point.

Therefore, in question 2 a and 2 b , the correct order of melting and boiling point are based on given structures are:

2)a : 4 , 1 , 3, 2

2)b : 4 , 3, 2 , 1

OH in highest molar tranet meer mass 2 wast 04 BV OM UM I highest hydrogen bonding