The chemicals change into new types of chemicals. You cannot undo a chemical change by physical means.
Understand the Problem
The question is making a statement about chemical changes and their irreversibility, indicating a concept in chemistry where new substances are formed and cannot be reverted to their original forms through physical means.
Answer
Chemical changes create new substances and are usually irreversible by physical means.
The final answer is that a chemical change results in the formation of new chemicals and cannot be undone by physical means. Reversing a chemical change typically requires another chemical reaction.
Answer for screen readers
The final answer is that a chemical change results in the formation of new chemicals and cannot be undone by physical means. Reversing a chemical change typically requires another chemical reaction.
More Information
A chemical change is characterized by the formation of a new substance, which renders it challenging to reverse, unlike a physical change. Examples of chemical changes include the burning of a candle, where new substances such as carbon dioxide and water are formed.
Tips
Mistaking physical changes (which only change appearance or state) for chemical changes that create new substances can be common. Ensure to look for evidence of a new substance forming to identify a chemical change.
Sources
- Chemical Change vs. Physical Change - Chemistry LibreTexts - chem.libretexts.org
- Physical and Chemical Changes | Science Lesson For Kids - generationgenius.com
- Physical Change and Chemical Change ( Read ) | Chemistry - CK-12 - ck12.org
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