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Chem Mod 4

Apologia Chemistry Module 4

QuestionAnswer
Pure substance A substance that contains only one element or compound
Mixture A substance that contains different compounds and/or elements
Homogeneous mixture A mixture with a composition that is always the same no matter what part of the sample you are observing
Heterogeneous mixture A mixture with a composition that is different depending on what part of the sample you are observing
Chemical change A change that affects the type of molecules or atoms in a substance (e.g. reacting, not easily reversed)
Physical change A change in which the atoms or molecules in a substance stay the same (e.g. dissolving, can usually be reversed relatively easily)
Kinetic theory of matter Molecules and atoms are in constant motion, and the higher the temperature, the greater their speed
Homonuclear diatomics Elements composed of individual molecules, not individual atoms: N₂ O₂ F₂ Cl₂ Br₂ I₂ At₂ H₂
Created by: thomas.macri