reactivity trends Flashcards
explain trend in boiling point group 7
- size of atom increases
- number of electrons increases
- more London forces of attraction
- stronger intermolecular forces
- more energy required to break these
- increased down the group
trend in reactivity down group 7
- reactivity decreases
- atomic radius decreases
- shielding decreases
- less nuclear attraction
group 2 reactivity
- more reactive as you go down
- atomic radius increases
- more shielding
- nuclear attraction decreases
- less energy needed to remove electrn
Reaction of group 2 element with water
Hydroxide and hydrogen gas
Group 2 element react with acid
Salt and hydrogen
Group 2 oxide react with water
Make metal hydroxide
Most reactive metal group 2
Barium
What happens to first ionisation energy as you go down group 2
Decreases
more shielding
larger atomic radius
less nuclear attraction
How would calcium react with water instead of strontium
Less effervescence
Dissolves slower
Less soluble
Lower ph/less alkaline
Equation for fourty ionisation energy of strontium
Sr3+->Sr4+ +e-
bond enthalpy group 7
decreases as you go down so hydrolyses faster
testing reactivity
add silver nitrate and ethanol to chloroalkane, bromoalkane and iodoalkane
yellow precipitate forms first - iodide
cream second - bromide
white last - chloride
Why is it unrective
Non polar
Radical
Species with unpaired electron
Type of bond breaking in radical substitution
Homolytic
