group 7 and 0 Flashcards
what are group 7 elements referred to as
halogens
what are the properties of the halogens
they are diatomic so they pair up w eachother ( I2 Cl2 etc)
they are toxic ( iodine is an antiseptic, chlorine kills bacteria in swimming pools)
they are brittle when soild
they are colourful
they melt and boil easily
what is the trend in boiling point in group 7
it’s increases as we go down therefore fluorine has the lowest melting and boiling points and astatine has the highest melting and boiling points
which experiment do we do to see the pattern in reactivity in group 7
reaction with iron wool
what happens when chlorine reacts with iron
hot iron reacts quickly, chlorine gas burns up and forms brown iron chloride
how does solid iodine react with iron wool
iron hardly reacts with the iodine despite being heated strongly, because it is lower down in the group
what happens when group 7 element reacts with group 1 metals
they react quickly, producing a metal halide as a white powder, like how sodium reacts with chlorine gas di make salt ( sodium chloride)
what is a displacement reaction
getting events to fight with one another for a metal ion
how can you test to find the identity of chloride, bromide and iodide ions and what’s the result
using silver nitrate solution, it will give a precipitate (insoluble solid) and the colour reveals which ion
what colour does the chloride ions turn if if they are present in silver nitrate experiment
white
what colour does bromide ions turn in silver nitrate experiment
cream colour précipitate
what colour does iodide ions go in silver nitrate solution experiment
yellow precipitate
what is group 0 also called
the noble gases
what is group 0 also called
the noble gases
what is the reactivity of group 0
very interactive because they have a full outer shell of electrons
what is the use of helium
it’s very unreactive and light so it’s used in airships and weather balloons
what is neon used for
it’s used in advertising lights bc it’s glows when electric current passes through it
what is argon used for
welding and construction of lightbulbs
what are the properties of chlorine
a toxic poisonous green gas, it’s used to kill bacteria in swimming pools and bleach ( 7 electron in outer shell and 3 elec shells)
properties of iodine
iodine is a shiny grey crystalline solid at room temp, when heated it turns to a purple vapour, it’s toxic so it can kill bacteria, it’s found in first aid kits to sterilise cuts and grazes
what is the ionic equation of chlorine ions reaction w silver nitrate
Ag+ + Cl = AgCl
what is the ionic equation of bromide ions reaction w silver nitrate solution
Ag+. + Br. =. AgBr
what is the ionic equation of iodide ions reaction w silver nitrate solution
Ag+. + I- = AgI
