Which of the following are examples of chemical changes: melting ice by spreading salt on an icy sidewalk, striking a match, baking a cake, rubbing your hands together to get them warm, using a tea bag to make tea, and cooking a hot dog?

Chemical changes are striking a match, cooking a hot dog, baking a cake and using teabags to make tea

Chemical changes are those changes in which the reactant or reactants combine to form a new product, and hence they are irreversible process. Now on careful examining, we see the examples which I have written above satisfies the criteria for chemical change. so hence they are example of chemical changes.