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Is sublimation a chemical change?

Answer 1

No. It is a physical change. See explanation.

The process by which one or more substances combine to form new substances is known as a chemical change, or reaction. Example:

#NaOH+HCl -> NaCl+H_2O#

Two substances—an acid and a hydroxide—react to produce two additional substances—salt and water.

If a substance (for example water) sublimates NO new substances are formed. Only the state of matter changes. A solid (ice) becomes a gas (vapour) but it is still the same chemical substance - water (#H_2O#)

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Answer 2

Olivia Anton

Sublimation, on the other hand, is the direct conversion of a solid into a gas without the need for a liquid phase; it is a physical change rather than a chemical one.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.