Atoms and Molecules

Question 1

Which of the following molecules is the most polar?

A. CO2
B. CH4
C. CH3OH
D. C2H6
E. O2

Answer 1

C. CH3OH

Question 2

When sodium with one electron and chlorine with seven electrons in their valence shells respectively interact, they will form _________.

Answer 2

Ionic Bonds

Question 3

What bonds will break when you blow-dry wet hair?

Answer 3

H-Bonds

Question 4

What is the correct ranking of the three bonds and interactions in order from highest to lowest in terms of their bond strength between two side chains of a protein in their tertiary structure?

Answer 4

I. Disulfide (-S-S-) bond between two cysteines

III H-bonding in water

II. Hydrophobic interactions between two leucines

Question 5

Biologists say covalent bonds are stronger than ionic bonds and chemists say ionic bonds are stronger than the covalent bonds.

Both are correct but what makes the difference?

Answer 5

Biological reactions happen mostly in aqueous surroundings, and covalent bonds are stronger than ionic in those situations

Question 6

Soap can be used to remove both grease (nonpolar) and salt (polar).

What property makes soap so versatile?

Answer 6

It’s Amphipathic

Question 7

How does the spreading of salt on the roads reduce ice formation? Briefly state the mechanism in a few words.

Answer 7

Salt lowers the freezing point of the water via freezing point depression

Question 8

You have used dishwashing soap in your dishwasher instead of dishwasher detergent by mistake. When the dishwasher started, it resulted in a lot of foam coming out and flooding the kitchen floor.

What is the chemical that can be found in your kitchen that will break down the bubbles and eliminate foaming?

Answer 8

Add more Salt