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Activity 1.1 Chemical reaction occurs when there is enough energy between reactants and creates products. The reaction can increase or decrease temperature which is one of the reasons that cleaning household products can burn skin or cause irritation. 1. What are the things you already know about the following concepts? 2. In what way will the following concepts be useful in understanding how chemical household cleaning products works effectively. Give a possible explanation. a. Energy b. Chemical reactions Let us see how these concepts occur in our lesson. Note: Be careful on handling household cleaning products.​