Assignment: Explain what a chemical reaction is and the particular chemical reaction you chose. According to the Encarta Dictionary, a chemical reaction is defined as a process that changes the molecular composition of a substance by redistributing atoms or groups of atoms without altering the structure of the nuclei of the atoms. A chemical reaction always absorbs or releases heat or light. In a chemical reaction, atoms must come in contact with one another, creating energy that is then absorbed or released in forms of heat and light. The major categories of chemical reactions are chemical and physical changes. In a chemical change, the properties of the original substance change unlike in physical changes where the properties do not change. The conservation of mass is related to chemical reactions because in ordinary chemical or physical changes, mass is neither created nor destroyed. A match is a small thin stick with a colored head; when struck against a phosphorous surface it ignites and forms fire. The strike plate of a matchbox is made of powdered glass and red phosph......

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