What does the chemical formula CaCl2 show about the compound it represents? A. It is made up of one element.
B. It is made up of two elements.
C. It is made up of three elements.
D. It is made up of four elements.

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An empty fuel tank can still contain and therefore can be even more dangerous than one full of liquid fuel.

Why does ammonia, nh3, behave as a base when it reacts with an acid? z

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 .