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Science

chemistry

TermDefinition
Physical Change Any change that alters the form or appearance of a substance but doesn't change it into another substance.
Chemical Change A change in matter that produces one or more new substances.
Reactants Substances that undergo chemical changes.
Products New substance or substances that are formed.
Precipitate A solid that forms forms liquids during a chemical reaction.
Exothermic Reaction The energy released as the product form is greater than the energy required to break bonds of the reactants.( usually heat)
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, by using symbols instead of words.
Law of Conservation Of Mass During a Chemical Reaction, matter is not created or destroyed.
Open System Matter can enter from or escape to the surroundings.
Closed System Matter doesn't leave or enter.
Coefficient A number placed in front of a chemical formula in an equation.
Synthesis When two or more elements or compounds combine to make a more complex substance.
Decoposition Reacts when compounds break down into simpler products.
Replacement 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 Increases the rate by lowering the activation energy needed.
Enzymes The cells in your body that contain thousands of biological catalysts.
Inhibitor A material that us used to decrease the rate of chemical reactions.
Created by: 15gibsonjae
 

 



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