Δs is negative for the reaction a.2so2 (g) + o2 (g) → 2so3 (g) b. nh4cl (s) → nh3 (g) + hcl (g) c. pbcl2 (s) → pb2+ (aq) + 2cl- (aq) d.2c (s) + o2 (g) → 2co2 (g) e. h2o (l) → h2o (g)

Skills of homo sapiens were found an excavation. the skulls were preserved because the bodies were frozen. so, these fossils are (blank) fossils. the image shows the evolution of skulls beginning 2 to 3 million years ago. based on the image, modern human skulls(blank) ape skulls.

Which of the following is the correct formula for copper (i) sulfate trihydrate? cuso4 · 3h2o cuso4(h2o)3 cu2so4(h2o)3 cu2so4 · 3h2o

What’s the theoretical yield of solid lead