Which process is an example of a chemical change?
a piece of wood shrinking as it dries out
steam rising from a boiling pot of soup
a metal railing rusting in damp weather
alcohol evaporating from a cotton swab

(C) A metal rail rusting Is an example of chemical change.

Explanation:

When a chemical change takes a place a new substance is formed.

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the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. completely dissociates to and ions. a is incorrect because does not fully ionize to and ions and some remain as the compound . c and d are incorrect because, and do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise,   if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both and have a complete octet so can not accept any electrons which disqualifies them as acids.