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Chemical Change
Term | Definition |
---|---|
Physical Change | is any change that alters the form or appearance of a substance but does not change it into another substance |
Chemical Change | A change in matter that produces one or more new substances |
Reactants | Substances that undergo the chemical changes |
Products | New substances that form |
Precipitate | A solid that forms from liquids during chemical reaction |
Exothermic Reaction | The energy released as the products form is greater than the energy required to break bonds of the reactants |
Endothermic Reaction | More energy is required to break bonds of the reactants than is released by the formation of the products |
Chemical Equation | A way to show a chemical reaction, using symbols instead of words |
Law of Conservation of Mass | States that during a chemical reaction matter is not created or destroyed |
Open System | Matter can enter from or escape to the surroundings |
Closed System | Matter does not enter or leave |
Coefficient | A number placed in front of a chemical formula in an equation |
Synthesis | When two or more complex substances, the reaction |
Decomposition | A reaction when compounds break down into simpler products. |
Replacement | The reaction when one element replaces another element in a compound or if two elements in different compounds trade places |
Activation Energy | The minimum amount of energy needed to start a chemical reaction |
Concentration | The amount of a substance in a given volume |
Catalyst | Lowering the activation energy needed |
Enzymes | The cells in your body containing thousands of biological catalyst |
Inhibitor | A material used to decrease the rate of a chemical reaction |