vocab pre-test

The process of a solid changing directly to a vapor without forming a liquid.

Different forms of the same element that have different molecular structures.

An element that usually is a gas or brittle solid at room temperature.

An element that can conduct electricity under certain conditions.

To respond to a stimulus; to exert a counteracting or reciprocal force.

A molecule composed of two atoms, which can be of the same or different chemical elements.

An element that has properties of both metals and nonmetals.

Elements that have atomic numbers greater than that of uranium (92).

A process that leads to the transformation of one set of chemical substances to another.

A change that affects one or more physical properties of a substance without altering its chemical composition.