2024 WAEC GCE SECOND SERIES (NOV.) CHEMISTRY: Chemistry practical (Chems) WAEC GCE 2nd Series (Nov.) Authentic Answer 2025 (1473)

3a)
(i) Distillation (for liquids with different boiling points).
(ii) Fractional distillation (for miscible liquids with closer boiling points).

(3bi)
Tongs
(PICK ANY ONE)
(i) Holding hot test tubes, beakers, or crucibles during heating.
(ii) Picking up small pieces of substances or glassware.
(iii) Removing a hot lid from a container.
(iv) Gripping and placing objects into a furnace or flame.

(3bii)
Wire gauze
(PICK ANY ONE)
(i) Supporting glassware (like a beaker) over a flame.
(ii) Distributing heat evenly under a heated container.
(iii) Preventing direct contact between glass and flame to reduce breakage.
(iv) Acting as a platform for conducting flame tests.

(3biii)
Beehive shelf
(PICK ANY ONE)
(i) Supporting a gas jar during gas collection over water.
(ii) Keeping the gas jar stable while transferring gases.
(iii) Directing gas from the delivery tube into the gas jar.
(iv) Serving as an intermediary platform to avoid gas loss during collection.

(3biv)
Spatula
(PICK ANY ONE)
(i) Transferring small amounts of solid chemicals from containers.
(ii) Mixing solid substances or scooping powders for weighing.
(iii) Scraping residues from containers.
(iv) Adding controlled amounts of a solid to a reaction mixture.

(3c)
In a Tabular form

GAS:
(i) H₂
(ii) CO₂
(iii) C₂H₂

SOLID:
(i) Mg
(ii) CaCO₃
(iii) CaC₃

LIQUID:
(i) Dil. HCL
(ii) Dil. HCL
(iii) Cold water

(3d)
Add dilute hydrochloric acid (HCl) to both solutions

(i) NaOH(aq): No visible reaction occurs, as it only forms water and salt.

(ii) Na₂CO₃(aq): Effervescence (bubbling) occurs due to the release of carbon dioxide gas (CO₂), which can be confirmed by bubbling it through limewater that turns milky