Final answer:
Two substances can be different in their chemical composition, physical properties, and chemical properties.
Step-by-step explanation:
In chemistry, two substances can be different in several ways:
- Chemical composition: Substances can have different elements and different proportions of those elements. For example, water (H2O) and methane (CH4) have different chemical compositions.
- Physical properties: Substances can have different physical properties such as color, odor, boiling point, density, and solubility. For instance, iron and gold have different colors and densities.
- Chemical properties: Substances can react differently with other substances. For example, sodium (Na) reacts vigorously with water, while aluminum (Al) does not react with water.
Learn more about differences between substances