During a chemical reaction new substances are formed from old ones. Which of the following is NOT ALWAYS true? [1]ANew substances can be changed back to the original onesBThere is often a colour changeCThere is often a temperature change
Question
During a chemical reaction new substances are formed from old ones. Which of the following is NOT ALWAYS true? [1]ANew substances can be changed back to the original onesBThere is often a colour changeCThere is often a temperature change
Solution
The statement that is NOT ALWAYS true during a chemical reaction is: "New substances can be changed back to the original ones".
This is because not all chemical reactions are reversible. In some reactions, the products cannot be converted back into the reactants. This is especially true for reactions that are considered "irreversible", where the reactants completely transform into the products and cannot go back to their original state.
While it is true that there is often a color change or a temperature change during a chemical reaction, these are not guaranteed in every reaction. However, the formation of new substances from old ones is a defining characteristic of a chemical reaction, and this always occurs.
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