Answer:
The relationship between metal and water is highly dependent on the specific metal and the conditions under which they react with water. In general, however, the reaction between metals and water can be either exothermic or endothermic.
For highly reactive metals like sodium or potassium, the reaction with water is highly exothermic, meaning that it releases a large amount of heat. This is because these metals readily react with water to produce hydrogen gas and a highly alkaline solution of metal hydroxide. For example, the reaction between sodium and water can be represented as:
2 Na(s) + 2 H2O(l) → 2 NaOH(aq) + H2(g) + heat
On the other hand, for less reactive metals like copper or silver, the reaction with water is usually endothermic, meaning that it absorbs heat from the surroundings. In these cases, the reaction occurs very slowly or not at all, and the metal may simply become coated with a layer of metal oxide or hydroxide. For example, the reaction between copper and water is relatively slow and can be represented as:
2 Cu(s) + O2(g) + 2 H2O(l) → 2 Cu(OH)2(s)
In summary, the relationship between metal and water in terms of exothermic and endothermic reactions is highly dependent on the specific metal and the conditions under which they react. Highly reactive metals tend to have exothermic reactions with water, while less reactive metals tend to have endothermic reactions or no reaction at all.