Write the cell notation for the voltaic cell that incorporates each of the following redox reactions. (Type your answer using the format [NH4] for NH4 , [Mg]2 for Mg2 , and CO2 for CO2.) (a) Al(s) Cr3 (aq) Al3 (aq) Cr(s) (s) | (aq) || (aq) | (s) (b) Cu2 (aq) SO2(g) 2 H2O(l) Cu(s) SO42-(aq) 4 H (aq) Pt | (g) | (aq), H (aq) || (aq) | (s)

Which statement describes the appearance of a temperature-vs.-time graph? a horizontal line shows that the temperature increases at a constant rate over time. a vertical line shows that the temperature decreases at a constant rate over time. horizontal lines where the temperature is constant during phase changes connect upward-sloping lines where the temperature increases. horizontal lines where the temperature increases are connected by upward-sloping lines where the temperature is constant for each phase.

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?

What happens to the temperature of a substance when the average kinetic energy of its particles increases?