Biol-1408-Quiz-4

The difference in pH units between two acidic solutions is three. How much more acidic is the stronger acid than the weaker acid?

1000

Water "beads up" on synthetic fabric like polyester but binds to cotton. What is the most likely explanation for this?

Polyester is nonpolar, whereas cotton is polar.

Select the most complete explanation of what the pH scale actually measures.

The concentration of hydrogen ions in a solution

We are about 75% water

True

Why is one side of a water molecule partially negative while the other side is partially positive?

Uneven sharing of electron pairs occurs due to the strong pull of oxygen

Something with a pH of 5 would be ________.

acidic

How do buffers minimize change in the pH of biological systems?

both of these (by donating H+ ions when there is a shortage) (by absorbing H+ ions when there is an excess)

A needle can be made to "float" on the surface tension of water. What causes this surface tension to form?

cohesive

Water is the lightest (least dense) when it ________.

freezes

One of the four properties of water is

moderate temperature