(a)[1]
State which substance is an element that forms an ion with a 2- charge.
(b)[1]
State which substance is an ionic compound.
(c)[1]
State which substance acts as a catalyst.
(d)[1]
State which substance is about 21% of clean, dry air by volume.
(e)[1]
State which substance is a gas required for photosynthesis.
(f)[1]
State which substance is the most reactive metal on the list.
(g)[1]
State which substance is a gas tested using acidified aqueous potassium manganate(VII).
(h)[1]
State which substance is a noble gas.
(i)[1]
State which substance belongs to Group VII.