Which ionic equation represents a spontaneous reaction that can occur in a voltaic cell? 1. cu(s) + zn(s) → cu2+(aq) + zn2+(aq) 2. cu(s) + zn2+(aq) → cu2+(aq) + zn(s) 3. cu2+(aq) + zn(s) → cu(s) + zn2+(aq) 4. cu2+(aq) + zn2+(aq) → cu(s) + zn(s)

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?

Many free radicals combine to form molecules that do not contain any unpaired electrons. the driving force for the radical–radical combination reaction is the formation of a new electron‑pair bond. consider the chemical equation. n(g)+no(g)⟶nno(g) n(g)+no(g)⟶nno(g) write lewis formulas for the reactant and product species in the chemical equation. include nonbonding electrons. n(g)n(g) select draw rings more erase select draw rings more erase select draw rings more erase n no(g)

In a ball-and-stick molecular model, what do the sticks represent?