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CH₃-CH=CH₂ propene
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In pb (no3)2 there is:
Lead- 1 atom
Oxygen- 6 atoms
Nitrogen- 2
9 atoms in all
Answer:
Both are only physical changes.
Actually, sewing an apron and dust settling out of air are both physical changes, as an apron could be unseweed by cutting the thread used, and when we disturb the dust particles, the dust particles will fet mixed back in the air so both are physical changes.
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