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Which of these is an example of a physical change? sugar dissolving in warm water iron rusting in the presence of moist air wood burning in the presence of oxygen baking soda reacting with acid to form a gas

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Erudite1
The correct option is; SUGAR DISSOLVING IN WARM WATER.
There are two types of change in chemistry; physical and chemical changes.
A physical change is a type of change in which no new substance is formed while a chemical change is a type of change in which a new substance is formed. 
Dissolving sugar in warm water is a physical change because no new substance is formed and the sugar can easily be recovered from the water by evaporating the water.
chynnaaaaa
A. sugar dissolving in warm water