A student blow a whisle. in which direction do the air particles vibrate with respect to the direction the sound wave travels. A. parallel to B. perpendicular to

C. at a45 angle to

D. at an unpredictable angle

Which class of molecules functions as chemical signals? hormones water carbohydrates proteins

Which of the following is an indication that a substance has undergone a chemical change? a. no new product has been formed. b. the color of the substance has not changed. c. the original constitute has not changed. d. the molecular structure has changed.

Carbon-14 undergoes radioactive decay in the reaction above. determine the type of radiation emitted in this reaction and describe what is happening to the nucleus during this reaction.