pure substance - has only one type of atom or molecule (eg. water), mixture - when particles of one substance are mixed with particles of another substance, homogeneous - when one substance is mixed in another, but it appears to be only one substance (eg. lemonade), heterogeneous - a mixture of substances where you can see the different substances that were mixed together (eg. salad), matter - anything that has mass and takes up space (solid, liquid, or gas), atom - the building blocks of matter; the smallest unit of an element, molecule - a group of atoms that are chemically bonded together (eg. H2O = water), physical change - changing the physical characteristics of something (changes in size, shape, appearance, or state of matter), chemical change - a change where a substance undergoes a transformation and a new substance is formed (signs of chemical change: colour change, bubbles, heat, smell), solution - a special homogeneous mixture formed when one substance is dissolved in another (eg. tea), solvent - in a solution, this is the substance doing the dissolving (eg. water for sugar water), solute - in a solution, the substance being dissolved (eg. sugar for sugar water), saturated - a solution where no more solute can be dissolved in the solvent; if more solute is added, it will not dissolve but will instead settle at the bottom of the container, acid - a substance with a pH of 0-6, base - a substance with a pH of 8-14,

Chemistry Terms

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