Which answer choices best indicate that a substance has experienced a chemical change?
• when the substance changes forms
• when a new substance is formed
• when the substance changes shape
• when the substance changes volume
The best answer choices that indicate a substance has experienced a chemical change are:
• when a new substance is formed
• when the substance changes forms
The best answer choice that indicates a substance has experienced a chemical change is:
• when a new substance is formed
The answer choices that best indicate that a substance has experienced a chemical change are:
- When a new substance is formed: In a chemical change, the identity of the substance changes, resulting in the formation of one or more new substances with different chemical properties.
- When the substance changes forms: While changes in physical form, such as from solid to liquid or gas, can occur in both physical and chemical changes, this answer choice by itself is not a strong indicator of a chemical change.
- When the substance changes shape: Changes in shape typically indicate a physical change, where the arrangement or orientation of the substance's particles is altered without a change in its chemical properties.
- When the substance changes volume: Changes in volume usually point towards a change in physical properties such as compression or expansion, rather than a chemical change where the substance's chemical composition is altered.
So, the answer choice "when a new substance is formed" is the most accurate and reliable indication that a substance has experienced a chemical change.