Many processes occur in the digestive system. Which process is best classified as a chemical change? Select one:

Peristalsis in the esophagus

Absorption of water

Enzymes in the saliva break down carbohydrates

Teeth grinding candy
PLS I NEED HELP!!

Clyde and marilyn are riding a roller coaster. during which section(s) of the track is their potential energy converted to kinetic energy? a. from point b to point c only b. from point b to point d only c. from point a to point b only d. from point a to point b and from point c to point d

What is the chemical formula of magnesium bromide? a. mgbr2 b. mgbr c. mg2br2 d. mg2br

Use the de broglie's wave equation to find the wavelength of an electron moving at 4.5 × 106 m/s. show your work. note: h= plank's constant (6.62607 x 10-34 j s)