M3.(a) (i) hydrogen accept H2 allow H 1 (ii) hydroxide accept OH– allow OH do not accept lithium hydroxide 1 (b) any two from: = potassium ‘it’ potassium: accept converse for lithium reacts / dissolves faster • allow reacts more vigorously / quickly / violently / explodesignore reacts more bubbles / fizzes faster • allow fizzes more allow more gas moves faster (on the surface) • allow moves more melts • allow forms a sphere produces (lilac / purple) flame • allow catches fire / ignites do not accept colours 2 [4] M4.(a) (i) gas 1
M3.(a) (i) hydrogen accept H2 allow H 1 (ii) hydroxide accept OH– allow OH do not accept lithium hydroxide 1 (b) any two from: ‘it’ = potassium potassium: accept converse for lithium • reacts / dissolves faster allow reacts more vigorously / quickly / violently / explodesignore reacts more • bubbles / fizzes faster allow fizzes more allow more gas • moves faster (on the surface) allow moves more • melts allow forms a sphere • produces (lilac / purple) flame allow catches fire / ignites do not accept colours 2 [4] M4.(a) (i) gas 1
c2_periodic_table_markscheme.docx