Lecture Note - Chemical Reactions

Lecture Note - Chemical Reactions - Chemical Reactions As...

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Chemical Reactions As we learned earlier the most fundamental building blocks of matter for chemists are atoms (that is, the elements you see in the periodic table). We also learned that atoms can combine with other atoms by chemical bonding to form molecules. Recall that the process where a molecule is transformed into a different molecule is called a chemical change . This process of chemical change is represented by a chemical reaction . For example, It is important to keep in mind that while in a chemical reaction molecules are destroyed and created by breaking and forming chemical bonds, atoms are neither created nor destroyed in a chemical reaction. In other words - there must be the same number of each type of atom on the product and reactant sides of the arrow. Making sure that this rule is obeyed is called "balancing the chemical equation". In the above example the equation would be unbalanced without the 2 in front of the O 2 and H 2 O. We can make a table to confirm that the number of atoms on each side of the arrow are the same: Reactants Products Balanced? 1 C 1 C Yes 4 H 4 H Yes 4 O 4 O Yes Notice that we never change the chemical formula of any product or reactant when trying to balance a chemical equation. A balanced equation is essential to known the stoichiometry for the chemical reaction. Stoichiometry - Relationship between quantities of matter that participate in chemical reactions. -or-
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Lecture Note - Chemical Reactions - Chemical Reactions As...

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