Answer ! d: kate gathered three boxes of the same size made of different materials: glass, clear, plastic, and alunium painted black. she placed them on a window sill in the sun for an hour and then measured the waremth if air in each box. in this experiment, the types of box materials are an a. constant variable b control c dependent variable d independent variable

Athe top of a hill, an athlete on a skateboard has x joules of mechanical energy. how much mechanical energy will she have at the bottom of the hill? ignore the effects of friction.

Asubstance is held in an open container. its particles move past one another at random speeds but do not leave the container. heat is removed from the system, and the particles slow down. when enough heat is removed, the particles no longer have enough speed to overcome the weak attractive forces between them. when this happens, the substance enters its solid state. the process described above is known as .

An unknown substance is a white solid at room temperature and has a melting point of 78 °c. which of the following substances is most likely to be the identity of the unknown sample?