Which of the following are decomposition reactions? How do you know this? (Multiple Answers)

[] A. N₂ (g) + 3H₂ (g) ➜ 2NH₃ (g)

[] B. CH₄ (g) + 2O₂ (g) ➜ CO₂ (g) + 2H₂O (g)

[] C. CaCO₃ (s) ➜ CaO (s) + CO₂ (g)

[] D. 2H₂O (I) ➜ 2H₂ (g) + O₂ (g)

Consider the reduction reactions and their equilibrium constants. cu+(aq)+e−↽−−⇀cu(s)pb2+(aq)+2e−↽−−⇀pb(s)fe3+(aq)+3e−↽−−⇀fe(=6.2×108=4.0×10−5=9.3×10−3 cu + ( aq ) + e − ↽ − − ⇀ cu ( s ) k =6.2× 10 8 pb 2 + ( aq ) +2 e − ↽ − − ⇀ pb ( s ) k =4.0× 10 − 5 fe 3 + ( aq ) +3 e − ↽ − − ⇀ fe ( s ) k =9.3× 10 − 3 arrange these ions from strongest to weakest oxidizing agent.

8) warming your hands by a fire is an example if which heat transfer? a. conduction b. convection c. radiation d. none of these

Using the periodic table, complete the following. element: hydrogen symbol: h₂ molecular weight: g mass of one mole: g/mol