What is the difference between system and surrounding in a chemical reaction

Displacement is the slope of a velocity vs. time graph a. true b. false

The gulf stream is a warm water current that flows away from the equator to northern europe. witch of these does it cause. a. crashes of warm and cool water in the ocean b. colder climates near the equator c. large waves on the cost of europe d. warm climates in northern europe

As changes in energy levels of electrons increase, the frequencies of atomic line spectra they emit