SC-1242
Physical and chemical changes
Lower Sec Science · Secondary 2 · Medium · Physical and chemical changes
A student adds a piece of magnesium ribbon into dilute hydrochloric acid. Bubbles are seen and the magnesium slowly disappears. Which statement best describes this change?
- It is a physical change because no new substance is formed.
- It is a chemical change because new substances are formed.
- It is a physical change because it can be easily reversed.
- It is a chemical change because only the state of magnesium changes.
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