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Equations & Reaction

Regents Chemistry-Equations & Reactions

QuestionAnswer
Chemical Reaction   Occurs when one or more substances change or recombine in new ways to form new substances  
Reactants   The starting materials in a chemical reaction  (on the left side)
Products   The substances that are the result of the change in the chemical reaction  (on the right side)
Signs of a chemical change Formation of precipitate, temperature change, color change, or formation of gas  
Law of Conservation of Matter and Energy Reactions must converve matter (mass and charge), and energy. Conserve EVERYTHING!
Chemical Equation   Using symbols and numbers to represent the changes that occur during a chemical reaction  
Coefficients big numbers put in front of formulas to balance an equation
Synthesis (direct combination) 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.
Precipitate A cloudy, solid that forms from soluble reactants
Subscripts The little numbers after the symbols to tell how many atoms there are
The driving force for chemical reactions Elements react to become more stable
Empirical Formula a formula in which the quantities of each element are written in the lowest whole number ratio
Molecular Formula a formula in which the quantities of each element are written in the whole number ratio that could be recuced further
Phase Symbols (s) = solid; (l) =liquid; (g) =gas; (aq)=solution in water
How table J works Higher (more reactive) elements can kick lower elements out of their compounds and take their place in single replacement reactions.
Created by: PRO Teacher etucci
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