CHM1025 Lecture Notes - Lecture 1: Physical Property, Exothermic Process, Chemical Change
5 Nov 2017
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Matter: occupies space and has mass, composed of atoms, exists as solid, liquid, or gas. Has space that are close together and is indefinite shape: solid. Has space close together and is definite in shape: gas. Are far apart and is indefinite in shape. Crystalline solid: when atoms or molecules are arranged in geometric patterns with long-range, repeating order. Amorphous solid: whe(cid:374) ato(cid:373)s or (cid:373)ole(cid:272)ules do(cid:374)"t have long-range order. Pure substance: composed of only one type of atom or molecule. Mixture: composed of two or more type of atom or molecules combined in variable proportions. Element: a substance that cannot be broken down into simpler substance. Compounds: a substance composed of two or more elements in fixed definite proportions. Heterogeneous mixture: when composition varies from one region to another. Homogeneous mixture: when the composition is the same throughout. Physical property: when a substance display without changing its composition. Chemical property: when a substance displays only through changing its composition.
