Which definition best describes global warming? -a long-term change in the Earth's climate -a long-term increase in the Earth's average temperature
-a long-term change in the climate of a region
-a city KD solar heat that is radiated out into space​

A100-watt light bulb radiates energy at a rate of 100 j/s. (the watt, a unit of power or energy over time, is defined as 1 j/s.) if all of the light emitted has a wavelength of 525 nm , how many photons are emitted per second?

Which statement correctly describes metallic bonds? a. they form when certain atoms lose electrons and other atoms gain electrons. b. they involve an attraction between anions and cations. they always involvpoth a metal and a nonmetal. d. they can only form between atoms of the same element. e. they form because electrons can move freely between atoms.

When water dissolves sugar, which process is not involved? o dissociation o hydration o surface area of the solute increases sa