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: purple for iodine and white for hydrogen.
2. Observe the reactants: the image shows molecules with two red spheres connected, indicating diatomic oxygen (O_2).
3. Observe the products: the image shows molecules with one red and two white spheres, indicating water (H_2O), and molecules with two red spheres, indicating diatomic oxygen (O_2).
4. Write the chemical formula for the reactants: O_2.
5. Write the chemical formula for the products: H_2O and O_2.

Key Concepts

Chemical Formulas

A chemical formula represents the composition of a substance using symbols for its constituent elements and numerical subscripts to indicate the number of atoms of each element. For example, H2O denotes water, consisting of two hydrogen atoms and 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 models, such as spheres, to visually depict the arrangement of atoms within a molecule. In the provided question, purple spheres represent iodine atoms, and white spheres represent hydrogen atoms. 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 the reactants and products is crucial for writing balanced chemical equations and understanding the conservation of mass, which states that matter is neither created nor destroyed in a chemical reaction.