Do you know what is meant by needed? does it mean lone pairs?
Answer:
2. A
3.B
4.B
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NaCl (Sodium chloride)
LiF (Lithium fluoride)
Endothermic reactions, on the other hand, absorb heat and/or light from their surroundings. For example, decomposition reactions are usually endothermic. In endothermic reactions, the products have more enthalpy than the reactants. Thus, an endothermic reaction is said to have a positive<span> enthalpy of reaction. This means that the energy required to break the bonds in the reactants is more than the energy released when new bonds form in the products; in other words, the reaction requires energy to proceed</span>
