A car is traveling at 20 meters/second and brought to rest by applying brakes over a period of 4 seconds. What is the average acceleration over this time interval?

In the lab, ammonia was mixed with water to form ammonium hydroxide. what is/are the reactant(s)? o water and ammonia o ammonia o ammonium hydroxide need

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?

Ahelium balloon contains 16.9 l of helium at stp. how many atoms of helium are in the balloon