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Chemical Change Where a new substance is produced. Corrosive eats away at a substance. Covalent Bond Bond where electrons are shared between atoms (between 2 nonmetals. Density How close together the molecules are. Flammable Can catch on fire. Freezing point Temperature at which a substance freeze. Ionic Bond Bond where electrons are donated or taken(between a metal and non metal). Nonpolar Molecule Molecule with no poles(only dissolves other nonpolar molecules, oil is best example). Oxidation to rust. pH Used to determine if a substance is an acid or base. Phase Solid, Liquid or Gas. Physical Change Substance changes how it looks, but remains the same substance. Polar Molecule Molecule that has poles(Positive and negative, only dissolves other polar molecules, water most common example). Products things you get out of a reaction. Reactants things you put into a reaction. Solubility the amount of solute that can dissolve in a solvent. Solute stuff that dissolves. Solvent Stuff that does the dissolving. Toxic Poisonous. Valence electrons Electrons in the outer shell of an atom. Viscosity Resistance of a fluid to flow(High viscosity = low flow). Absorption Wave is absorbed and disappears. Accelerations change in velocity. Conduction heat transfer by direct contact of particles. Conservation of mass mass cannot be created or destroyed. Convection Heat transfer by currents(only in a liquid or gas Diffraction Wave is bent when it passes around an obstacle or through a hole in it. Inertia objects tend to keep doing what they were doing. Polarization Elimination of all directions of light but one. Pressure Force over an area(area goes up, pressure goes down). Radiation Heat transfer by electromagnetic waves( can happen in space). Reflection Wave hits a barrier and bounces off. Refraction Wave is bent when it passes into a new substance. Resonance Force vibration. Accurate Values of measurements are close to each other. Benefit Good side of an occurrence. Binary involves two things. Control group Group you don't do anything to in an experiment. Duplication Make a copy. Fission To break apart. Fusion to join together. Hydro involves water. Hypothesis Education Guess Moderate Middle of the road. Precise Value of a measurement close to the actual value. Synthesize make. Thrive Do well.