What is a chemical Reaction?
Chemical Reactions occur when one or more chemicals change forming one or more different chemicals.
Chemical reactions are represented by a chemical equatioin.
For example: Calcium + Sulfur —–> Calcium Sulfide
Reactants : The name for the starting chemicals of a chemical reaction.
Products: The name for the resulting chemicals of a chemical reaction.
The model for a chemical reaction equation is: reactants————-> products
Types of Chemical Reactions
1. Combination Reaction: When two or more reactions combine to form one product.
calcium plus sulfur —> calcium sulfide
Ca + S ——> CaS
2. Decomposition: When one reactant breaks apart forming two or more products.
carbonic acid ———-> water + carbon dioxide
H2CO3 ——————-> H2O + CO2
3. Single Displacement: When a single uncombined element is reactive enough to take the place of another element in a compound. Two reactants produce two different products.
zinc + hydrosulfuric acid ———–> hydrogen + zinc sulfide
Zn + H2S —————————> H2 + ZnS
4. Double Displacement: When the parts of two reactant compounds switch partners forming two new product compounds.
silver nitrate + sodium chloride ——–> silver chloride + sodium nitrate
AgNO3 + NaCl ———————> AgCl + NaNO3
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