What evidence in lavoisier's twelve-day experiment showed that oxygen was chemically reacting (combusting) with substances? a) he obtained less of the gas as disappeared in the last experiment. b) lavoisier noticed that about four-fifths of the air had been used up. c) he noticed that there was a gas that did not support life or burning. d) a red oxide of mercury was formed on the surface of the mercury in the retort.

Grade 91.)the gravitational pull from the moon words).2.) what is the rate of gravitational 3.)if you drop a hammer, is it more likely to drop handle side down, head side down, or equal chance that it will land either way? why? 4.)a car moves 60km east and 90km west.a.) what is the distance the car traveled? b.) what is the car's displacement5.)what is the average velocity of a car that moved 60 km south in 3 hours? 6.) a car starts from rest and acceleration to 60 m/s over a time of 5 seconds. what is the acceleration of the car? 7.)what is the speed of an object at rest?