Most chemical reactions involve the breaking and formation of chemical bonds. It takes energy to break a chemical bond but energy is released when chemical bonds are formed. If more energy is released than consumed, then the chemical reaction evolves heat and is said to be exothermic.
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1-5.037077324x10^23
Use these magic triangles they will help you a lot
Atoms that have different numbers of neutrons than protons and electrons are called isotopes.
Answer: (D) environmental chemistry
Explanation:
