Chapter 1.1, Problem 1RQ

Interpretation Introduction

Interpretation:

Two examples of chemical change needs to be explained.

Concept introduction:

When a new product is formed in a chemical reaction, it is considered a chemical change. In a chemical change, the absorption of energy or loss of energy occurs in a chemical reaction and compound formed with the new composition.

Answer to Problem 1RQ

A chemical reaction between aluminum and oxygen to form aluminum oxide is a chemical change.

The reaction between acid and base to form a new compound is a chemical change and it is irreversible.

Explanation of Solution

In a chemical reaction, the property of the product is different from the reactant. The composition of the new product is different from the starting reactant. So, it is considered a chemical change. A chemical change is an irreversible process.

Conclusion

The reaction between aluminum and oxygen forms its oxide and in the second example, acid-base reacts together and forms salt. Here, both products have different properties from the original reactant so these are considered as chemical change.