If purple spheres represent iodine atoms, white spheres represent hydrogen atoms, and all the molecules are gases, (7.4, 7.5) Reactants
→ Products
a. write the formula for each of the reactants and products.

Verified step by step guidance

1. Identify the colors of the spheres: red spheres represent oxygen atoms, and white spheres represent hydrogen atoms.
2. Count the number of each type of molecule on the reactant side. There are three molecules, each consisting of two red spheres bonded together, indicating O2 (oxygen gas).
3. Count the number of each type of molecule on the product side. There are two types of molecules: one with two red spheres bonded together (O2) and another with two white spheres bonded to a red sphere, indicating H2O (water).
4. Write the chemical formula for the reactants: 3 O2.
5. Write the chemical formula for the products: 2 H2O + O2.

Key Concepts

Chemical Formulas

Chemical formulas represent the composition of a substance using symbols for its constituent elements. For example, H2O denotes water, indicating two hydrogen atoms bonded to one oxygen atom. Understanding how to write and interpret these formulas is essential for identifying reactants and products in chemical reactions.

Molecular Representation

Molecular representation uses visual models, such as spheres, to depict atoms and their connections in a molecule. In the provided images, purple spheres represent iodine, while white spheres represent hydrogen. This visual aid helps in understanding molecular structure and the relationships between different atoms in reactants and products.

Reactants and Products

In a chemical reaction, reactants are the starting substances that undergo transformation, while products are the substances formed as a result of the reaction. Identifying these components is crucial for writing balanced chemical equations and understanding the conservation of mass in chemical processes.