State whether each of the following is a physical or a chemical change. (a) Baking soda fizzes

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State whether each of the following is a physical or a chemical change. 

(a) Baking soda fizzes in vinegar. 

(b) Vinegar and oil separate into two layers. 

(c) A flaming wood log releases heat. 

(d) A helium balloon decreases in size.

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