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Chapter 1 – Matter and Measurement State: whether a substance is a solid, liquid, or gas. (Gases are always subject to more change with a change in temperature and pressure change) Kinetic-Molecular theory: all matter consists of extremely tiny particles (atoms, molecules, or ions) Heterogeneous: uneven textures of the material can be detectedHomogeneous: consists of two or more substances in the same phase. (homogenous mixtures are also referred to as solutions) An atom is the smallest particle of an element that retains the characteristic chemical properties of that element. A pure substance which is composed of two or more different elements, held together by a chemical bond, is referred to as a: chemical compound. Ions: electrically charged atoms or groups of atoms.