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Andre45 [30]
3 years ago
7

What is an example of an irreversible physical change?

Chemistry
1 answer:
frosja888 [35]3 years ago
3 0

The answer is B. making sawdust.

Because, to make sawdust you have to shred wood and you can't reverse that. Therefore, making sawdust is irreversible.

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Describe how you could show by adding aqueous sodium hydroxide and aqueous ammonia that a solution contained zinc ions.
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Answer:

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*excess sodium hydroxide: Precipitate dissolves to form a COLOURLESS solution

*Result with Aqueous ammonia: White ppt of Zn(OH)2

*excess aqueous ammonia: Precipitate dissolves to form a COLOURLESS solution

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