For the reaction shown, calculate how many grams of oxygen form when each quantity of reactant completely reacts. 2KClO3(s)→2KCl(s)+3O2(g)

a) 2.57g KClO3
b)0.345g KClO3
c)86.4 kg KClO3
d)29.7 mg KClO3

The twister and runaway train are two coasters at the same amusement park. both coasters start at the same height. the coaster for the twister is twice the mass of the coaster for the runaway train. which roller coaster has greater gravitational potential energy at the start of the ride?

The number of neutrons is equal to the atomic number minus the atomic mass. a. true b. false

Which of the following is in the lanthanide family? a) uranium b) promethium c) silver d) gold