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Ch. 5 - Chemistry51
Chapter 5 - Chemical Reactions
Term | Definition |
---|---|
Chemical change | chemical reaction—converts one substance into another. |
physical change | alters the physical state of a substance without changing its composition. |
chemical equation | is an expression that uses chemical formulas and other symbols to illustrate what reactants constitute the starting materials in a reaction and what products are formed. |
Chemical reactions | involve breaking bonds in the starting materials, called reactants, and forming new bonds in the products. |
reactants | are written on the left |
products | are written on the right |
coefficients | show the number of molecules of a given element or compound that react or are formed. |
law of conservation of mass | states the atoms cannot be created or destroyed in a chemical reaction. |