Rate, How fast a chemical reaction happens., Collision, When reacting particles hit each other., Catalyst, A substance that speeds up a reaction without being used up., Activation, The minimum energy needed for a reaction to start., Concentration, Increasing this can increase the rate of reaction., SurfaceArea, Powdered solids react faster because they have more of this., Equilibrium, When forward and backward reactions happen at the same rate., Reversible, A reaction that can go in both directions., LeChatelier, The principle that predicts how equilibrium responds to changes in conditions., Alkane, A saturated hydrocarbon with only single bonds., Alkene, A hydrocarbon containing a carbon–carbon double bond., Cracking, Breaking long-chain hydrocarbons into smaller molecules., Polymer, A large molecule made from many repeating units., Monomer, A small molecule that joins with others to form a polymer., Ethanol, An alcohol made by fermentation or hydration of ethene., Fermentation, The process using yeast to produce ethanol from glucose., Atmosphere, The layer of gases surrounding the Earth., Greenhouse, Gases that trap heat in the Earth’s atmosphere., Chromatography, A technique used to separate mixtures., Titration, A method used to calculate the concentration of an acid or alkali.

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