Non-Covalent Interactions Quiz

What are the strongest non-covalent interactions?

• van der Waals forces

• London dispersion forces

• Hydrogen bonds

• Dipole-dipole interactions

• Ionic interactions

Which of the following would NOT form a suitable buffer?

• Acetic acid/acetate

• Hydrochloric acid/chloride

• Carbonic acid/bicarbonate

• Phosphoric acid/dihydrogen phosphate

• Succinic acid/succinate

Which of the following molecules would form a micelle?

• NaCl

• CH₃COOH

• CH₃(CH₂)₄CH₃

• H₃PO₄

• CH₃(CH₂)₁₀COO⁻Na⁺

You wish to prepare 0.5 L of 0.2 M phosphate buffer at pH 7.7. Which is the relevant equation and pKa?

• None of the above

Under what conditions would a carboxyl group be mostly charged?

• pH < pK

• pH = pK

• pH > pK

• pH = 0

Under what conditions would an amine group be mostly charged?

• pH < pK

• pH = pK

• pH > pK

• pH = 0

Which of the following might be able to cross a lipid bilayer?

• A

• B

• CO₂

• Both B & A

Oxygen attracts most of the _____ towards its end and away from the hydrogen.

The phrase "like dissolves like" refers to the fact that ___

• gases can only dissolve other gases

• polar solvents dissolve polar solutes and nonpolar solvents dissolve nonpolar solutes

• solvents can only dissolve solutes of similar molar mass

• polar solvents dissolve nonpolar solutes and vice versa

Which molecule contains a non-polar covalent bond?

• 
• 
• 
• 

Answer explanation

Bromine molecules share equally their electrons in the bond.

They have NO DIFFERENCE in their electronegativity values (Table S). Since neither has a greater or lesser desire to gain the electrons in a bond, neither gets that electron more or less. Thus, the bond is perfectly balanced, or NON-P0LAR. All the other molecules were slightly to strongly polar.

Tags

NGSS.HS-PS1-2