What is the dielectric constant of hexane? and the dipole?

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.

40dm3 of gas at 760 torr are heated from 5°c to 50°c what is the new volume

Calculate the concentration of all species in a 0.165 m solution of h2co3.