Name a metal which is visible vigorously react with water
Answers
Answer:
Explanation:OK, so I’ll give you the info about all group-1 elements which has the trend of giving violent reactions with water. Then we’ll decide which reacts most vigorously. Got my point, then, Here we go:
General
All of these metals react vigorously or even explosively with cold water. In each case, a solution of the metal hydroxide is produced together with hydrogen gas.
This equation applies to any of these metals and water - just replace the X by the symbol you want.
In each of the following descriptions, I am assuming a very small bit of the metal is dropped into water in a fairly large container.
Details for the individual metals
Lithium
Lithium's density is only about half that of water so it floats on the surface, gently fizzing and giving off hydrogen. It gradually reacts and disappears, forming a colourless solution of lithium hydroxide. The reaction generates heat too slowly and lithium's melting point is too high for it to melt (see sodium below).
Sodium
Sodium also floats on the surface, but enough heat is given off to melt the sodium (sodium has a lower melting point than lithium and the reaction produces heat faster) and it melts almost at once to form a small silvery ball that dashes around the surface. A white trail of sodium hydroxide is seen in the water under the sodium, but this soon dissolves to give a colourless solution of sodium hydroxide.
The sodium moves because it is pushed around by the hydrogen which is given off during the reaction. If the sodium becomes trapped on the side of the container, the hydrogen may catch fire to burn with an orange flame. The colour is due to contamination of the normally blue hydrogen flame with sodium compounds.
Potassium
Potassium behaves rather like sodium except that the reaction is faster and enough heat is given off to set light to the hydrogen. This time the normal hydrogen flame is contaminated by potassium compounds and so is coloured lilac (a faintly bluish pink).
Rubidium
Rubidium is denser than water and so sinks. It reacts violently and immediately, with everything spitting out of the container again. Rubidium hydroxide solution and hydrogen are formed.
Caesium
Caesium explodes on contact with water, quite possibly shattering the container. Caesium hydroxide and hydrogen are formed
Summary of the trend in reactivity
The Group 1 metals become more reactive towards water as you go down the Group.
Oh, you thinking, why I not talked about Francium? Well, its a bit scary! You wanna know, Why? Scroll, further.
Reaction of francium with water. Francium is very scarce and expensive. It is umlikely that anyone has ever reacted the metal with water. However, given that all the other Group 1 elements react to form colourless solutions of the hydroxide and hydrogen gas (H2), it would be strange if francium not do the same.
Francium is element number 87 on the periodic table. The element can be prepared by bombarding thorium with protons and an extremely small amount occurs naturally in uranium minerals, but it is so rare and radioactive that there has never been enough of it to actually see what would happen if a piece was dropped into water. However, it's certain the reaction would be energetic, possibly even explosive. The piece of francium would blow apart, while the reaction with water would produce hydrogen gas and francium hydroxide and a whole lot of heat. The entire area would be contaminated with radioactive material.
So, decision time;
Francium is below cesium on the table and would react more readily and violently.
Why? Each of the alkali metals is characterized by having a single valence electron. This electron easily reacts with other atoms, such as those in water. As you move down the periodic table, the atoms become larger and the lone valence electron is easier to remove, making the element more reactive.
Answer:
It is sodium and pottasium...
Hope it helps..