Your friend has to plan an experiment for a science fair. he asked for your . his topic is "the strongest cloth for backpacks." what variables must the experinemt include? what variables must be controlled?

This flow chart shows the amount of energy that is emitted by each type of light. ultraviolet > blue light > yellow light > red light (maximum energy) (minimum energy) in an experiment, shining which type of light on a strip of metal would be least likely to produce the photoelectric effect? ultraviolet light dim blue light bright red light bright yellow light

Asolid that forms and separates from a liquid mixture is called

An atom of which element reacts with an atom of hydrogen to form a bond with the greatest degree of polarity ?