group 1 & 7 test and redox Flashcards
how do LI, NA and K react with water
vigorously
what do the reactions of LI,NA and K with water produce
metal hydroxide solution
why can you see fizzing when an alkali metal reacts with water
because hydrogen is produced
what forms when a group 1 metal reacts with oxygen
metal oxides
what does lithium + oxygen produce
lithium oxide (Li20)
what does sodium + oxygen produce
mixture of sodium oxide (Na20) and sodium peroxide (Na2O2)
what does potassium + water produce
potassium peroxide (K2O2) an potassium superoxide (KO2)
what is the trend in reactivity as you go down group 1
the metals get more reactive
why do group 1 metals get more reactive down the group
-as you go down the group, the outermost electron gets further from the nucleus
-meaning the attraction between the outermost electron and the nucleus becomes less
-so, the outermost electron is more easily lost down the group so the metals are more reactive down the group
as the atomic number of the halogens increases, what happens to the properties of the elements
the elements get darker and have a higher boiling point
what colour is chlorine at room temperature
green
what colour is bromine
red-brown liquid but orange vapour at room temperature
what colour is iodine
dark grey solid which gives off purple vapour when heated
what is the trend in reactivity as you go up group 7
the elements get more reactive up the group
how can you predict the colour of astatine
because the boiling points of the elements increase as you go down the group ( so astatine would be a black solid)
