Chemistry 5070 · O Level · Identification of ions and gases
Identification of ions and gases — practice question
Select your answers from the compounds listed below.
ammonia
ethanol
glucose
magnesium chloride
magnesium oxide
methane
nitrogen dioxide
phosphorus(V) chloride
poly(ethene)
sodium bromide
water
Each compound can be chosen once, more than once, or not used at all.
Identify the compound that:
(a)[1]
is the waste gas given off during digestion in animals
(b)[1]
changes blue cobalt(II) chloride to pink
(c)[1]
reacts with ethene above $100\,^{\circ}\text{C}$ to produce ethanol
(d)[1]
is produced by photosynthesis
(e)[1]
contains an anion carrying a $-2$ charge
Worked solution & mark scheme
This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “methane gas” …