Group-1 (physical Properties Oxygen,water And Chlorine Reactions) Flashcards
What are the physical properties of group 1/ alkali metals ?
They are soft, low density and low melting point.
What are the trends in group 1
More reactive the further down the group. More reactive means easier to loose an electron in the outer shell when. This means the electrons on the outer shells are less strongly attached.
Key reactions of group 1
4Li+ O2 — 2Li2O (white compound)
2Na+2H2O(water)——- 2NaOH(alkaline)+H2(fizzing)
2Na+Cl2——2NaCl (white compound)
How do we explain the reactivity of group 1?
Become 1+ ions
Also
Outer most shell further away the further down the group so the increased distance weakens the attractive force meaning the electron can be lost more easily
How do group 1 reaction with water ?
Produces metal hydroxide and Hydrogen gas
Reacts vigorously
Potassium is the first one that sets fire and it reacts extremely rapidly and a gas is produced
How do group 1 metals react with chlorine gas ?
Form white metal chloride salts
Group 1 metal will loose 1 electron to become +1 ion
Chlorine gains 1 electron to become a -1 chloride ion
If it’s lithium it looses one and chlorine gains one and it forms Lithium chloride
How do alkali metals/ group 1 react with Oxygen ?
Form ( the metal) oxide
React rapidly
Going down the group they react more rapidly
If is was sodium reacting with oxygen it produces Sodium oxide
What are group 1 called ?
Alkali metals
How would lithium react with oxygen ?
2 Li atoms would loose there outer shell electron to become +1 ions
Oxygen would gain to electrons to have a full outer shell and be a -2 oxide ion
4Li + 2O —-> 2Li2O
You would draw it as the square box around the ions
Will all group 1 metals react with oxygen the same way ?
Yes, this is due to them all having the same outer shell electron
4Li + O2— 2Li2O
4Na + O2 —— 2Na2O
The symbol equation doesn’t change
