Chemistry 0620 · IGCSE · Physical and chemical changes
Physical and chemical changes — practice question
The following set of chemical and physical processes, A to H, is given.
A combustion
B diffusion
C melting
D neutralisation
E photosynthesis
F reversible reaction
G roasting
H thermal decomposition
Answer the questions about processes A to H below.
Each letter can be used once, more than once, or not used at all.
(a)[1]
State which process from A to H occurs when an acid reacts with an alkali.
(b)[1]
State which process from A to H reaches equilibrium.
(c)[1]
State which process from A to H is the change from a solid (particles in fixed positions) to a liquid (particles that can move but are still touching).
(d)[1]
State which of the processes A to H count as physical changes. ................. and .................
(e)[1]
State which of the processes A to H is caused by gas particles colliding with one another.
Worked solution & mark scheme
This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Option D” …