Sarah is a student who loves conducting science experiments at home. One day, she decided to investigate the properties of some substances she found in her kitchen. She gathered three substances: sugar, salt, and baking soda. Sarah planned to perform various tests to determine the nature of these substances. Questions: a. What are the three substances Sarah gathered for her experiment? b. How would you classify sugar, salt, and baking soda based on their chemical composition? c. Are they likely to be atoms, molecules, compounds, or mixtures? Explain your reasoning.