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Equations & Reaction

Regents Chemistry-Equations & Reactions

QuestionAnswer
Chemical Reaction   Occurs when one or more substances change to form new substances  
Reactants   The substances that change in a chemical reaction  
Products   The substances that are the result of the change in the chemical reaction  
Signs of a chemical reaction Formation of precipitate, temperature change, color change, or formation of gas  
Law of Conservation of Mass   Matter can neither be created nor destroyed, it can only change form  
Chemical Equation   A way of writing the changes that occur during a chemical reaction  
reactants chemicals needed to start a reaction; on the left side of the arrow
products chemicals on the right side of the arrow, the end result of the reaction
coefficients big numbers put in front of formulas to balance an equation
synthesis combine 2 or more reactants to make a bigger product
decomposition break down a big reactant into smaller chemicals
single replacement One element is kicked out of a compound and replaced by another. Table J tells if this can be spontaneous.
double replacement Chemical square dance do-si-do. Positive and negative ions trade partners.
percipitate A cloudy, solid that forms from soluble reactants
subscripts The little numbers after the symbols to tell how many atoms there are
The reason why reactions occur Elements react to become more stable
Endothermic A reaction that absorbs (gains) energy. Products are LESS stable than reactants.
Exothermic A reaction that releases energy. Products are MORE stable than reactants.
Created by: etucci