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Reactants serve as the starting point in chemical reactions. They are the original substances that are consumed during the course of a reaction. These substances usually appear on the left-hand side of a chemical equation. They engage in the reaction by breaking their existing chemical bonds, which is critical for the transformation to the products.
This breaking of bonds absorbs energy from the surroundings, and this process is known as the energy input phase. Here are some key points about reactants:

• They are transformed into new substances during a chemical reaction.
• Present at the beginning of a reaction.
• Can be elements or compounds.

Reactants' roles are pivotal, as no reaction occurs without them. During a typical chemical reaction, the transformation they undergo signifies the change, leading to products that differ from the original substances.

Products result from the transformation of reactants in a chemical reaction. After reactants interact and bonds are broken and reformed, products emerge on the right-hand side of a chemical equation. These new substances are different in structure and composition from the initial reactants. The creation of bonds in products typically releases energy, characterizing the phase where energy is emitted.
Products define the final state of the chemical reaction, having gone through the modifications necessary for their formation. Here are the main points about products:

• They are the result of reactant transformation.
• Appear at the end of a chemical reaction.
• Have properties that differ from reactants.

This outcome is crucial as it marks the completion of the chemical transformation process, and the properties of the products relate directly to how reactants interacted.

Chemical equations provide a symbolic representation of a chemical reaction. They depict the transformation of reactants into products and outline how substances change during the process. Typically, chemical equations are written with reactants on the left and products on the right, separated by an arrow indicating the direction of transformation.
The arrow, sometimes read as "yields" or "produces," illustrates the progression of the reaction from left to right. Balancing chemical equations is vital to ensure that the number of each type of atom is consistent on both sides, reflecting the law of conservation of mass. Key aspects of chemical equations include:

• Showing all reactants and products involved in the reaction.
• Having balanced equations to comply with conservation laws.
• Indicating the physical states of substances (solid, liquid, gas, dissolved in water).

Understanding chemical equations is essential, as they succinctly explain how a chemical process unfolds, and provide insight into the nature of the substances involved.