click below
click below
Normal Size Small Size show me how
Chem Mod 4
Apologia Chemistry Module 4
Question | Answer |
---|---|
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 |