A tennis player squeezes a cold pack to start a reaction. She says that the drop in temperature means energy is leaving the system. Is she correct? Where does the energy go?

If a planet rotates 360 degrees during a 24 hour time period, what does that tell us about the planet? a. the middle of the planet is in darkness b. the seasons on the planet vary every day. c. the planet runs on a 12-hour time clock. d. the temperature on the planet varies daily.

Which process transfers heat from inside earth to its surface? convection currents in mantle pulling away of tectonic plates drawing in of tectonic plates convection currents in crust

How many moles of no2 will form when 3.3 moles of cu are reacted with excess hno3?