Which are not hydrophilic? A) Cl-ions B) CH3-groups C) -O-H groups D) NH4 + ions

Question

Which are not hydrophilic?

A) Cl-ions

B) CH3-groups

C) -O-H groups

D) NH4+ ions

CH3CH2OH, ethanol, and water are miscible in all proportions because __________.

A) they can freely disperse in one another

B) they contain OH

groups

C) their attractions are similar

D) all of the above

Which example demonstrates a net decrease in dispersion (becomes less dispersed or decreases in disorder/entropy)?

A) adding cream to hot coffee

B) assembling a 1000piece

jigsaw puzzle

C) melting an ice cube

D) ripping a finished jigsaw puzzle into a thousand pieces

Explanation / Answer

1. B

2.D

3.B

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