Question

16. According to the general trends in the periodic table, which of the following is the most electronegative element?

A) Te        B) Se        C) O         D) N         E) S

17. Consider the following liquids with similar molar masses. Predict which has the strongest intermolecular attraction based only on boiling point data.?

A) acetic acid (Bp @ 760 mm Hg = 118°C)
B) ethyl chloride (Bp @ 760 mm Hg = 12°C)
C) butane (Bp @ 760 mm Hg = -0.5°C)
D) ethyl methyl ether (Bp @ 760 mm Hg = 11°C) E) propyl alcohol (Bp @ 760 mm Hg = 97°C)

18) What is the molecular shape of a methane molecule, CH4?

A) bent

B) linear
C) tetrahedral
D) trigonal pyramidal

E) none of the above

19) Which of the following is a chemical change?

A) bending a steel rod
B) making a snowman
C) burning sugar

D) cutting a rope

E) melting gold

20) Consider the following liquids with similar molar masses. Predict which has the weakest intermolecular attraction based only on vapor pressure data?

A) ethyl ether (vapor pressure @ 20°C = 450 mm Hg)
B) propionic acid (vapor pressure @ 20°C = 5 mm Hg)
C) propyl chloride (vapor pressure @ 20°C = 300 mm Hg)

D) butyl alcohol (vapor pressure @ 20°C = 6 mm Hg)
E) pentane (vapor pressure @ 20°C = 430 mm Hg)

Answer 1

question 18 as CH₄ HAVE CENTRAL atom carbon with sp³ hybridization so its shape will be tetrahedral Ans C

Q1b As electronegtivity decreases down the group 2 increases from left to right ois and most however F id most electronegtive a in periodic Table. So Ans (c) o oxygen 27 due to higher inter malecular force voileng pant will become high. So liqued with highest Boiling point have highest intermolecular borces Ans (A) Acetic And (BP @ 760 mm Hg 118 €

QUESTION 19 during a chemical process old bonds are broken and new are formed and generally its irreversible so and is burning of sugar as after burning you can't make sugar from ash

Ans C

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