Invisible Ink with Lemon Juice Can the changes be reversed? Class 7
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Invisible Ink with Lemon Juice Can the changes be reversed? Class 7
Invisible Ink with Lemon Juice: Class 7
- Can the changes be reversed?
- What happens?
Answer:
Explanation:
- Lemon juice contains organic compounds (mainly sugars and acids). When you heat the paper, these compounds undergo a chemical change and form new substances (mainly carbon), which appear as brown marks.
- Type of Change: This is a chemical change because new substances are formed. The brown marks are chemically different from the original lemon juice.
- Can it be reversed? No, this change cannot be reversed. Once the lemon juice has been heated and turned brown, you cannot get the original lemon juice back.
Summary Table:
| Step | Type of Change |
| Writing with lemon juice | Physical |
| Heating (letters become brown) | Chemical |