Water changing from liquid to steam is not a chemical reaction.
What is chemical reactions?
Chemical reactions occur when chemical bonds between atoms are formed or broken. The substances that go into a chemical reaction are called the reactants, and the substances produced at the end of the reaction are known as the products. An arrow is drawn between the reactants and products to indicate the direction of the chemical reaction, though a chemical reaction is not always a "one-way street," as we'll explore further in the next section.
According to the question
1> Water changing from liquid to steam
Boiling of water to form steam is a physical change because during this only change of state occurs from liquid water to steam (gaseous) without any change in its chemical composition or there is no new bonds are formed or broken .
2> Apple turning brown from oxygen hitting it
Apples turn brown because of a chemical reaction called "oxidation", which is caused by oxygen from the air.
3> Baking soda and vinegar creating bubbles
Mixing baking soda and vinegar will create a chemical reaction because one is an acid and the other a base
4> Cellular respiration creating energy
The degradation of foodstuffs is to convert the energy contained in chemical bonds into the energy-rich compound adenosine triphosphate (ATP), which captures the chemical energy obtained from the breakdown of food molecules and releases it to fuel other cellular processes.
Hence, the Water changing from liquid to steam is not a chemical reaction.
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