Top 10 important words and phrases for Chemistry Professor

Top 10 important words and phrases for Chemistry Professor 1. Element An element is a substance that cannot be broken down into simpler substances by chemical means. Each element is represented by a unique symbol, such as H for hydrogen and O for oxygen. 2. Compound A compound is a substance formed by the chemical combination of two or more elements in a fixed ratio. Water (H2O) and carbon dioxide (CO2) are examples of compounds. 3. Molecule A molecule is the smallest unit of a compound that retains the chemical properties of that compound. It is formed by the combination of two or more atoms. 4. Reactant A reactant is a substance that undergoes a chemical change in a reaction. It is present at the start of a reaction and is consumed to form products. 5. Product