Another name for group 1 metals
Alkali metals
Why are the elements in Group 1 called the alkali metals?
1)They are all *metals* ,
2)They all react with water to make an *alkaline solution*
How does reactivity change as you go down the group?
Increases
What is the Symbol of Potassium?
K
What is the Symbol of Lithium
Li
Formula of Sodium
Na
What are the properties of alkali Metals?
Soft to cut,
reacts with air,
lighter than water,
Catch fire in water.
Why are potassium and sodium stored under oil?
1)to prevent reaction with moisture and oxygen.,
2) they also react with water so can't be stored in water.
What is observed when a bean-sized piece of sodium is added to water in a water trough (behind a safety screen)?
It floats,
It melts to form a silver ball,
It darts around,
It fizzes,
It may catch fire, burning with a yellow flame,
It produces heat,
I
What is observed when a rice-grain-sized piece of potassium is added to water in a water trough (behind a safety screen)?
It floats,
It explodes/crackles,
It fizzes,
It immediately catches fire, burning with a lilac flame,
It disappears,
It produces heat.
What is observed when a bean-sized piece of caesium is added to water in a water trough (behind a safety screen)?
It sinks,
It explodes, breaking the water trough.
