When potassium metal is added to water, a violent reaction occurs that releases a tremendous amount of light and thermal energy. This is an example of an what
reaction.
Answers
Answer:
Exothermic rxn
Explanation:
When potassium is added to water the metal melts and float. It moves around very quickly on the surface of the water. The metal self ignites which also ignites the hydrogen gas
Answer:
exothermic
Explanation:
When the Group 1 Elements react with water they give off hydrogen gas. The heat generated by the chemical reaction sets the hydrogen gas alight and it burns with a coloured flame. Sodium burns with an orange flame.
A powerful chemical reaction is going on here:
Sodium + Water => Hydrogen + Sodium hydroxide
What has happened is that the sodium atom has managed to lose its single electron in the outside shell of its eleven electrons. The energy released has given the reaction enough heat to ignite the hydrogen and cause the sodium metal to skate around the surface of the water.
Potassium is also a metal that is found in Group 1 of the periodic table. However, potassium has more electrons than sodium and is more reactive than the other metal.
You can see that the potassium reaction with water also produces a flame: in this case a lilac-coloured one. The flame in this photograph doesn't look as big - this is because the reaction finished much more quickly ... and also because I didn't want to put too much of this dangerous metal into the water!
The chemical reaction in this case is:
Potassium + Water => Hydrogen + Potassium hydroxide
... again, the gas produced is hydrogen - which soon sets alight