Which is the correct definition of a chemical reaction? a. substances are mixed together. b. substances interact to form new substances. c. things change color. d. substances melt.

Question 1 (5 pts): what is the maximum distance for which you can you resolve the two individual headlights of an on-coming truck as two separate lights rather than one if the headlights are separated by 2.00 m and your eye has a diameter of 1.00 centimeter? assume a wavelength of 500 nm.