. Circle the correct answer on the test papeP s well a Each question carries fiv

Question

. Circle the correct answer on the test papeP s well a Each question carries five points. 1. Which one of the following substances is expected to have the highest boiling point? A) Br B) Clz C) F2 D) 12 2. Which of following can form hydrogen bonds with water molecules? (I) Na (2) CHCOOH 3) CHe (4) CHaNH A) B) C) D) E) (1) and (2) (1) and (3) (2) and (3) (2) and (4) (3) and (4) Which property of water allows a razor blade to float on it without sinking? A) viscosity B) surface tension C) density D) specific heat E) triple point 3. 4. Which of the following phase changes is exothermic? A) Sublimation B) Condensation C) Melting D) Vaporization Which of the following would be expected to have the highest vapor pressure at room temperature? A) ethanol, bp 78°C B) methanol, bp=65°C C) water, bp=100°C D) acetone, bp=56°C 5. Page 1

Explanation / Answer

1.

option D. I2 is the answer.

with increasing the molar mass of compound, melting point increases.

2. option D is the answer.

CH3COOH contains -CO2H group and CH3NH2 group contains -NH2 group.

so these compounds take part in hydrogen bonding.

3.

option B. surface tension is the answer.

4.

option B) condensation is the answer.

during condensation heat is released.

5.

lowest boiling point leads to the highest vapor pressure.

so option D is the answer.

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