Which of the following are observations? - the candle floats. - the tires are flat. - the dog is barking. - the tire is flat because of a decrease in temperature. - if a person walks by, then the dog will bark.

Consider this equilibrium: n29) + o2(g) + 2no(c).nitrogen gas and oxygen gas react when placed in a closed container. as the reaction proceeds towards equilibrium, what happens to the rate of thereverse reaction?

What is true for a substance that releases energy

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.