QuestionAugust 3, 2025

Q. KEY QUESTIONS 1. What changes occur to chemical bonds during a chemical reaction? 2. How does the change in energy of a chemical reaction predict whether or not the reaction will occur? 3. Explain the role of enzymes and how they affect the chemical reactions of living things.

Q. KEY QUESTIONS 1. What changes occur to chemical bonds during a chemical reaction? 2. How does the change in energy of a chemical reaction predict whether or not the reaction will occur? 3. Explain the role of enzymes and how they affect the chemical reactions of living things.
Q. KEY QUESTIONS 1. What changes occur to chemical bonds during a chemical reaction? 2. How does the change in energy of a chemical reaction predict whether or not the reaction will occur? 3. Explain the role of enzymes and how they affect the chemical reactions of living things.

Solution
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Answer

1. Chemical bonds are broken and formed during a reaction. ### 2. Negative energy change predicts spontaneous reactions; positive may require energy input. ### 3. Enzymes lower activation energy, speeding up reactions without altering equilibrium. Explanation 1. Chemical Bonds in Reactions During a chemical reaction, **chemical bonds** between atoms are broken and new bonds are formed. This rearrangement of atoms results in the transformation of reactants into products. 2. Energy Change and Reaction Prediction The change in energy during a chemical reaction is determined by the difference between the energy required to break bonds and the energy released when new bonds form. If the overall energy change is negative (exothermic), the reaction is likely to occur spontaneously. Conversely, if it is positive (endothermic), external energy may be needed for the reaction to proceed. 3. Role of Enzymes in Chemical Reactions Enzymes are biological catalysts that speed up chemical reactions in living organisms by lowering the activation energy required. They do not alter the equilibrium of the reaction but increase the rate at which equilibrium is reached.

Explanation

1. Chemical Bonds in Reactions<br /> During a chemical reaction, **chemical bonds** between atoms are broken and new bonds are formed. This rearrangement of atoms results in the transformation of reactants into products.<br /><br />2. Energy Change and Reaction Prediction<br /> The change in energy during a chemical reaction is determined by the difference between the energy required to break bonds and the energy released when new bonds form. If the overall energy change is negative (exothermic), the reaction is likely to occur spontaneously. Conversely, if it is positive (endothermic), external energy may be needed for the reaction to proceed.<br /><br />3. Role of Enzymes in Chemical Reactions<br /> Enzymes are biological catalysts that speed up chemical reactions in living organisms by lowering the activation energy required. They do not alter the equilibrium of the reaction but increase the rate at which equilibrium is reached.
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