Which of the following is an oxidation-reduction reaction? Fe2O3 + 3CO Right arrow. 2Fe + 3CO2
CuSO4 + 2NaOH Right arrow. Cu(OH)2 + Na2SO4
2NaOH + H2CO3 Right arrow. Na2CO3 + 2NaOH
Pb(NO3)2 + Na2SO4 Right arrow. 2NaNO3 + PbSO4

How many atoms of mg are present in 97.22 grams of mg? 6.022 × 1023 2.408 × 1024 4.818 × 1024 5.855 × 1025

Which answer tells the reason the earth’s climate is getting warmer? too many animals are becoming extinct. large glaciers are melting in antarctica. the earth is moving closer to the sun. driving cars gives off gases that trap heat in the atmosphere.

Molecular iodine, i2(g), dissociates into iodine atoms at 625 k with a first-order rate constant of 0.271 s−1. part a part complete what is the half-life for this reaction?