How can you use kinetic energy to complete a step in your contraption such as a rolling ball hitting a lever or switch

c is the answer because when something is left after something evaporates that shows the chemical change.

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.