Which process describes a change that forms new substances with different properties?

Which process describes a change that forms new substances with different properties?

• A. Physical change
• B. Phase transition
• C. Mixing
• D. Chemical change

Answer: (D)

Forming new substances with properties that differ from the originals happens during a chemical change. In a chemical change, bonds are broken and new bonds form, changing the substance’s composition and leading to different properties such as color, odor, reactivity, or energy content. For example, burning wood turns it into ash and gases, rust on iron creates iron oxide, and baking a cake yields a product with a new mixture and characteristics. This contrasts with phase changes like melting ice, where the substance remains the same (water) but in a different state, or simple mixing where the original substances are still present. So the process described is a chemical change.

Forming new substances with properties that differ from the originals happens during a chemical change. In a chemical change, bonds are broken and new bonds form, changing the substance’s composition and leading to different properties such as color, odor, reactivity, or energy content. For example, burning wood turns it into ash and gases, rust on iron creates iron oxide, and baking a cake yields a product with a new mixture and characteristics. This contrasts with phase changes like melting ice, where the substance remains the same (water) but in a different state, or simple mixing where the original substances are still present. So the process described is a chemical change.