what three elements in school are kept under oil ?
what is the reaction of water and caesium
2007-10-23 01:41:00 · 9 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
why do they keep it under oil ?
2007-10-23 01:42:36 · update #1
Lithium
Potassium
Rubidium
They keep them in oil to stop them reacting with the air.
When Caesium hits water it tends to destroy the container that the water is in as it is a very violent reaction.
2007-10-23 01:47:04 · answer #1 · answered by Doctor Q 6 · 0⤊ 0⤋
Sodium, Potassium and Lithium might be good choices. Calcium as well. Magnesium is mearly inflammable. Phosphorus is usually kept under water.
The reason metals like Sodium need to be kept under oil is that they combine very vigorously with either air or water. Iron slowly rusts, but with Sodium, the reaction is instantaneous:
2Na(s) + 2H2O(l) -> NaOH(s) + H2(g)
The products are rather reactive as well. NaOH is Sodium hydroxide, and used as drain cleaner. Hydrogen is an extremely inflammable gas. Highschool chemistry teachers often place a small piece of Sodium metal in a bucket of water as a demonstartion. Sodium metal is lighter than water and floats around on the surface like a small fireball. Potassium and lithium will react the same way.
Lithium, Sodium, Potassium, and Caesium are all members of the same chemical "family". They have a single electron in their last atomic shell and donate it to another atom. In doing so, they become positive ions and achieve a more stable state. This is why these metals are so chemically reactive and always found as positive, dissolved ions in nature.
Caesium reacts with water to produce Caesium hydroxide and Hydrogen gas:
2Cs(s) + H2O(l) -> 2CsOH(s) + H2(g)
Caesium hydroxide is one of the most powerful bases known and can even dissolve glass. Like Hydrofluoric acid (the strongest acid), it can be kept in a plastic bottle, however. Plastic hydrocarbons don't form positive or negative ions and don't react with strong acids and bases.
2007-10-23 09:00:57 · answer #2 · answered by Roger S 7 · 0⤊ 0⤋
Lithium, Potassium and Rubidium. They are kept in oil to prevent them reacting with the oxygen in the air because the reaction forms lithium (or the other metals) oxide.
The reaction with caesium and water produces a violent reaction forming caesium hydroxide (an alkali) and hydrogen.
2007-10-23 09:00:38 · answer #3 · answered by Bon Appetit 3 · 0⤊ 0⤋
Cs + H2O--> CsOH+1/2H2
when you throw Cs or another alkali metal (Rb, K, Na) in water an hydroxide is formed and hydrogen is released. this is an exothermic reaction which occurs immediately. So, to keep these metal you must avoid contact of water and add oil which is not miscible with water
2007-10-23 08:52:56 · answer #4 · answered by maussy 7 · 0⤊ 0⤋
In schools they store lithium, sodium and potassium. They do not usually keep any of the other alkali metals because they tend to react with the moisture in the air.
2007-10-23 09:39:39 · answer #5 · answered by Anonymous · 0⤊ 0⤋
all the alkali metals are stored in oils to prevent the chemical reactions
cs reacts with water gives CSOH and liberates H gas
2007-10-23 09:05:26 · answer #6 · answered by Varaprasad 4 · 0⤊ 0⤋
They're stored under oil to keep them away from atmospheric moisture.
2007-10-23 09:07:18 · answer #7 · answered by chasm81 4 · 0⤊ 0⤋
It Would be Lithium Potassium Rubidium
2007-10-23 09:32:28 · answer #8 · answered by chelsea w 1 · 0⤊ 0⤋
ca+h20=cao+h2
2007-10-23 10:34:25 · answer #9 · answered by rajkumar r 3 · 0⤊ 0⤋