Which of these is an indication that a chemical reaction has occurred?

a. melting of a substance

b. boiling of a substance

c. formation of a precipitate

d. freezing of a substance

In an energy pyramid, which level has the most available energy?

Acurium-245 nucleus is hit with a neutron and changes as shown by the equation. complete the equation by filling in the missing parts. 52

Nitrogen dioxide decomposes according to the reaction 2 no2(g) ⇌ 2 no(g) + o2(g) where kp = 4.48 × 10−13 at a certain temperature. if 0.70 atm of no2 is added to a container and allowed to come to equilibrium, what are the equilibrium partial pressures of no(g) and o2(g)