PC

Question 1

What is the charge of an axon?

Answer 1

Negative

Question 2

Which ion is smaller, Na+ or Cl-?

Answer 2

Na+, because it has one less electron shell

Question 3

Oxyacid

Answer 3

The bond between H and O breaks when the substance dissolves (forms acidic solution)

Question 4

Squalene

Answer 4

Precursor of the fused four-ring system common to cholesterol and all of the steroid hormones

Question 5

Hemiacetal

Answer 5

a OH and a OR bonded to C; in ring form, there is a -OH right next to cyclic O (usually to the right); in cellobiose, lactose, and maltose; Hemiacetal can ring open and give an aldehyde that reduce Ag+ (react with Tollen’s reagent to given silver mirror)

Question 6

Reverse-phase high performance liquid chromatography (HPLC)

Answer 6

Silica (stationary phase) is non-polar and the polar molecules will pass quickly through and eluted first

Question 7

High performance liquid chromatography (HPLC)

Answer 7

Silica (stationary phase) is polar, and non-polar phase will pass through quickly and be eluted first

Question 8

Doppler effect (ultrasound)

Answer 8

relates the frequency of the ultrasound wave as detected by a moving detector to the frequency of the wave when source is stationary, the speed of the source, and speed of the detector (need to know the speed of sound, frequencies of the sounds waves emitted and observed)

Question 9

Hydrogen bonding

Answer 9

When H bonds with highly electronegative elements such as N, O, and F

Question 10

Calculate photon energy

Answer 10

P=