Which of the following steps can be used to identify an acid-base reaction? (5 points) Check whether the products are an acid and a base. Check whether the reactants are an acid and a base. Check if the ions of two compounds exchange places. Check if one element replaces another element in a compound.

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

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