Question

read it! why are chemical bonds important? - questions 1. which of the following is not a reason why chemical bonds are important? a. bonds create new elements b. bonds are used to make new substances c. building and breaking bonds are part of the energy cycle d. chemical bonds sustain life 1. a chemical reaction occurs when ____. a. chemical bonds are built b. chemical bonds are broken c. a new substance is created d. all of the above 1. a(n) ____ reaction happens when chemical bonds give off heat. a. endothermic b. exothermic c. metallic d. covalent

Explanation:

• For the first question: Chemical bonds do not create new elements. Elements are defined by their number of protons. Making new substances (B), being part of the energy cycle (C), and sustaining life (D) are valid reasons for the importance of chemical bonds.
• For the second question: A chemical reaction occurs when chemical bonds are built (A), broken (B), or a new substance is created (C). So all of the above (D) is correct.
• For the third question: An exothermic reaction is one where heat is given off. Endothermic (A) absorbs heat. Metallic (C) and covalent (D) are types of bonds, not reaction types related to heat release.

Answer:

1. A. Bonds create new elements
2. D. All of the above
3. B. Exothermic