Question

this section describes what happens to chemical bonds during chemical reactions. it also explains how energy changes affect chemical reactions and describes the importance of enzymes. chemical reactions 1. what is a chemical reaction? 2. complete the table about chemicals in a chemical reaction. chemicals in a chemical reaction chemicals definition reactants products 3. chemical reactions always involve changes in chemical _____________. energy in reactions 4. what is released or absorbed whenever chemical bonds form or are broken? 5. what do chemical reactions that absorb energy need to occur? 6. chemists call the energy needed to get a reaction started the _____________. 7. complete the graph of an energy - releasing reaction by adding labels to show the energy of the reactants, the energy of the products, and the activation energy. energy - releasing reaction energy course of reaction

Explanation:

1. A chemical reaction is the process by which substances (reactants) are transformed into different substances (products) through the breaking and forming of chemical bonds.
2. Reactants are the starting - substances in a chemical reaction. Products are the substances formed as a result of the chemical reaction.
3. Chemical reactions always involve changes in chemical bonds.
4. Energy is released or absorbed when chemical bonds form or are broken.
5. Chemical reactions that absorb energy need an input of energy to occur.
6. The energy needed to start a reaction is called the activation energy.
7. On the energy - releasing reaction graph, the energy of the reactants is labeled at the initial horizontal line, the energy of the products is labeled at the final horizontal line (lower than the reactants' energy), and the activation energy is labeled as the vertical distance from the reactants' energy level to the peak of the curve.

Answer:

1. A process where reactants are transformed into products by breaking and forming chemical bonds.
2. Reactants: Starting substances in a chemical reaction. Products: Substances formed in a chemical reaction.
3. Bonds
4. Energy
5. An input of energy
6. Activation energy
7. Label the initial horizontal line as "Energy of Reactants", the final horizontal line (lower) as "Energy of Products", and the vertical distance from the reactants' energy level to the peak as "Activation Energy".