Identify the double displacement reactions among the following: 1. kcl(aq) + agno3(aq) - agcl(s) + kno3(aq) 2. na2so4(aq) + bacl2(aq) →baso4(s) + 2nacl(aq) 3. h2so4((aq) + 2naoh(aq) na2so4((aq) + 2h2o(1) a) 1 and 3 only b) 2 and 3 only c) 1 and 2 only d) all of 1, 2, and 3 e) none of 1, 2, and 3

Darla claims that the first periodic table developed by mendeleev was not completely accurate, so it is not useful at all. harmony argues that it establish the periodic table we use today, making it more credible. who is correct and why? darla is correct, because a model that has any mistakes should be thrown out. darla is correct, because a good model would not need to change. harmony is correct, because mendeleev’s model had all of the information correct in the first version. harmony is correct, because mendeleev’s model made predictions that came true.

Chemical kinetics what was the rate of reaction in trial 3? choose the closest answer.

Plz mark brainliest 30 points 1) find the momentum of a 12 kg snowball that is rolling with a velocity of 9 m/s. 2) an 8 ball with a mass of .5 kg is sitting at rest. it is hit by the cue ball (1 kg) traveling at 2.5 m/s. if the cue ball is at rest after the collision, how fast is the 8 ball traveling after the collision? 3) two football players are running toward each other. if the offensive player is 75 kg and is running 8 m/s, how fast must the 60 kg defensive player run in order for the two players to hit and stop?