Final answer:
Lithium, an alkali metal, floats when it reacts with water due to its lower density. The reaction is vigorous, producing hydrogen gas and lithium hydroxide while releasing heat.
Step-by-step explanation:
The question asks whether Lithium floats when reacting with water. The answer is A) Yes, it floats. Lithium is an alkali metal and, similar to other members of this group, it is less dense than water. Hence, when lithium reacts with water, it floats on the surface. Lithium's reaction with water is quite vigorous, generating hydrogen gas as one of the products. Moreover, due to lithium's high reactivity with moisture and oxygen in the air, it needs to be stored under mineral oil to prevent it from reacting. When lithium does come into contact with water, an exothermic reaction occurs, producing lithium hydroxide and hydrogen gas.
Lithium floats when reacting with water. Lithium is an alkali metal that is less dense than water. This means that it has a lower weight per unit of volume compared to water, causing it to float. The reaction between lithium and water is highly exothermic, releasing hydrogen gas and forming lithium hydroxide.