Which statement is true about the products of two reactants that combine chemically? a. they are different than the reactants. b. some products are the same as the reactants. c. one product is the same as a reactant but the other is different. d. products will spontaneously degrade back to reactants.

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?

Diffraction is when light is bent around obstructions. which of the these observation about clouds would indicate diffraction? a) after rain storms, you can sometimes see rainbows. b) clouds are white or gray and cannot be seen through. c) on a cloudy day, the temperature tends to be cooler than a sunny day. d) the edges of dark clouds appear lighter. this

What are the two basic types of satellites