C4.1 Flashcards
Trends of group 1 alkali methods
As you go down the group elements become more reactive, boiling points and melting points decrease
Characteristics of group 1 metals
Soft
Low density
Low melting point
Good conductors of electricity
What are group 1 reactions
Metal + water = metal hydroxide + hydrogen
When reacts with water what do lithium sodium and potassium do?
Lithium - fizzes steadily and slowly disappears
Sodium - fizzes vigorously and quickly disappears.
Potassium - immediately ignites, very quickly disappears.
Remember they become more reactive as you go down
Group 0 noble gasses, why is it a gas at room temp
Weak intermolecular forces so a small amount of energy is required to break them
What are the trends of group 0
As it goes down the group : boiling point increases (attractive force between atoms is higher)
Density increases (more atoms therefore more mass in a given volume)
Halogens group 7 non metals, what are their characteristics?
Soft
Not shiny
Poor conductors of electricity
Exist as diatomic molecules with weak intermolecular forces.
Trends of group 7 halogens
As you go down the group:
Atomic radius increases
Attraction between outer shell electron and nucleus decreases, so harder to gain electron
Density increases
Melting point and boiling point increases
In halogen displacement reaction what happens?
More reactive halogen will replace a less reactive halogen (reactivity decreases as you go down a group) example Cl + 2KBr = KCl + Br2 - chlorine more reactive than bromine so it replaces it
What are the colour of halogens
Fluorine - yellow gas
Chlorine - green gas
Bromine - orange brown liquid
Iodine - purple vapour
Transition metals where are they located on periodic table
Middle
Properties of transition metals
High Mp
Shiny when freshly cut
Hard and strong
Good conductors of heat and electricity
When transition metal react they
Lose electron to form positive ion.
What metal groups are more reactive than transition metal and why
Group 1 and 2 are more reactive than transition metal because they become a positive ion easier due to their electronic configuration
How do metals react with water or dilute hydrochloric acid
Metal + water = metal hydroxide and hydrogen
Metal + acid =salt + hydrogen
