Which of the following best represents a mixture of two compounds?

• A. A container with both H2O and CO2 molecules present, but not bonded together.
• B. A container with H2O and O2 atoms chemically bonded to form H2O2.
• C. A container with only H2O molecules.
• D. A container with only CO2 molecules.

Answer: (A)

Verified step by step guidance

1. Understand the difference between a mixture and a compound: A mixture contains two or more substances physically combined, not chemically bonded, while a compound consists of atoms chemically bonded in fixed ratios.
2. Analyze each option: Identify whether the substances are chemically bonded or simply coexisting.
3. For the option with H2O and CO2 molecules present but not bonded together, recognize this as a physical combination of two different substances, which defines a mixture.
4. For the option with H2O and O2 atoms chemically bonded to form H2O2, recognize this as a compound because the atoms are chemically bonded.
5. For the options with only H2O molecules or only CO2 molecules, these represent pure substances, not mixtures.