* A mathematical equation: 2 + 2 = 4
* A description of a physical change: Ice melting into water
* A sentence: "The sky is blue."
* A chemical formula: H₂O (This is the formula for water, but it doesn't show a reaction)
* A list of ingredients: Flour, sugar, eggs (This describes a mixture, not a reaction)
Key features of a chemical equation:
* Reactants and Products: It shows the substances involved in a chemical reaction, with reactants on the left side and products on the right.
* Arrow: It uses an arrow to indicate the direction of the reaction.
* Stoichiometry: It uses coefficients to show the relative amounts of each substance involved.
* Chemical Formulas: It uses chemical formulas to represent the reactants and products.
Example of a chemical equation:
2H₂ + O₂ → 2H₂O
This equation represents the reaction between hydrogen gas (H₂) and oxygen gas (O₂) to produce water (H₂O).
