Chemistry B Equations Packet

Exothermic

Chemical reactions that produce or release heat

Endothermic

Chemical reactions that require heat to be added in order to occur

Decomposition Reactions

Compounds are broken apart to form elements, or in some cases, complex compounds are decomposed to form simpler compounds

Solvent

During a physical change the thing that causes or does the dissolving

Composition Reaction

Elements combines to form a compound or in some cases simple compounds combine to form a more complex compound

Products

Materials that are formed as a result of chemical reaction

Law of Conservation of Matter

Matter is neither created nor destroyed during a chemical reaction

Coefficients

Number in front of the element that tells you the number of molecules of that element

Single Replacement

One element takes the place of a second element In a compound

Physical Change

Only changes the state of matter (solid,gas,or liquid) or dissolves the substance

Chemical Change

Produces new substances with new properties

Subscripts

The smaller number placed lower next to the element that tells you the number of atoms in each element

Precipitate

The solid formed during a chemical reaction

Reactants

The starting material in a chemical reaction

Solute

The thing that gets dissolved during a physical change

Combustion Reactions

This reaction is a specific type of decomposition and fuel burns by reacting with oxygen. The fuel in this reaction is generally hydrocarbon. The product of combustion is carbonic acid, which then decomposes into carbon dioxide water and energy

Double Replacement

Two compounds reacting with each other : the positive ion of one compound combines with the negative ion of the second compound and vice versa