Classify the following descriptions or pictures as either an endothermic or exothermic. Explain.

Column A
1.A chemical reaction in which energy is absorbed into the system from the surroundings.
2.The stored energy of the products is less than the stored energy of the reactants.
3.A chemical reaction in which energy is released from the system into the surroundings.
4.The stored energy of the products is greater than the stored energy of the reactants.
5.The container in which the reaction is in will feel hot.
6.Energy will be written as a product in the balanced chemical equation.
7.A chemical reaction in which energy is written as a reactant.
8.The burning of wood.
9.The baking of pizza dough.
10.The container in which the reaction is in will feel cold.

1 answer

1. Endothermic - This is an endothermic reaction because energy is absorbed into the system from the surroundings.
2. Exothermic - This is an exothermic reaction because the stored energy of the products is less than the stored energy of the reactants.
3. Exothermic - This is an exothermic reaction because energy is released from the system into the surroundings.
4. Endothermic - This is an endothermic reaction because the stored energy of the products is greater than the stored energy of the reactants.
5. Exothermic - The container feeling hot indicates that energy is being released into the surroundings, making it an exothermic reaction.
6. Exothermic - If the energy is written as a product in the balanced chemical equation, it indicates that energy is being released into the surroundings, making it an exothermic reaction.
7. Endothermic - If energy is written as a reactant, it indicates that energy is being absorbed into the system, making it an endothermic reaction.
8. Exothermic - The burning of wood releases energy into the surroundings, making it an exothermic reaction.
9. Endothermic - The baking of pizza dough absorbs energy from the surroundings, making it an endothermic reaction.
10. Endothermic - The container feeling cold indicates that energy is being absorbed from the surroundings, making it an endothermic reaction.