Question: What does a Chemical reaction do?

Answer: changes the substances into different substances by breaking and forming chemical bonds

Question: reactant

Answer: the substances changed during a chemical reaction

Question: product

Answer: the substances made by a chemical reaction

Question: bond energy

Answer: the amount of energy that will break a bond between two atoms

Question: equilibrium

Answer: is reached when both the reactants and products are made at the same rate

Question: activation energy

Answer: the amount of energy that needs to be absorbed for a chemical reaction to start

Question: exothermic

Answer: chemical reaction that releases more energy than it absorbs

Question: endothermic

Answer: chemical reaction that releases less energy that it absorbs

Question: Why might it not always be possible to determine the reactants and the products in a reaction? Explain your answer in terms of chemical equilibrium.

Answer: The chemical equilibrium, depending on the concentration of reactants and products, may be formed at the same rate.

Question: A chemical reaction can start when enough activation energy is added to the reactants. Do you think the activation energy for chemical reactions in living things is high or low. Explain your answer.

Answer: High, the enzymes in cells function or speed up reactions by lowering the activation energy.