Ionic bonds are formed between a cation (metal) and an anion (nonmetal)
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These physical changes could be classified based on their energy requirements: endothermic or exothermic. Endothermic reaction need to absorb energy, while exothermic reaction need to release the energy in order to achieve spontaneous reactions.
Exothermic: Condensation, Freezing, Deposition
Endothermic: Sublimation, Evaporation, Melting
<span>they have to be selective permeable to filter out the waste products but allow the nutrients and blood cells to pass through. </span>
