alleryStart learning →Liquid bromine is poured into a bottle. What condition lets a liquid to vapour equilibrium form?
AThe bottle is capped so no vapour escapes
BThe bottle is warmed above the boiling point
CThe bottle is left open to the room air here
DThe bottle is filled right up to the very brim
Answer & Solution
Correct answer: A. The bottle is capped so no vapour escapes
1. Evaporation and condensation are the forward and reverse steps of a physical change.
2. A capped bottle holds the vapour in, so condensation can build up to match evaporation.
3. Once the two rates match, the amounts of liquid and vapour stop changing.
4. If the bottle were left uncapped the vapour would escape and no equilibrium would be reached.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 13 "Fundamental Equilibrium Concepts", section 13.1 Chemical Equilibria_
Keep practising Fundamental Equilibrium Concepts
Browse all Fundamental Equilibrium Concepts questions for GCE A-Level (Singapore), or explore more Chemistry topics.
Related questions
Swipe each change by the way it shiftsKnock out the false equilibrium claimsFor N2 + 3H2 forming 2NH3 with Kc = 6.00 x 10^-2, [N2] = 4.26 M and [H2] = 2.09 M. What isFor 0.15 M HCN with Kc = 4.9 x 10^-10, what is the hydrogen ion concentration at equilibriWhen may the change x be neglected against an initial concentration in an equilibrium calcA quadratic solved for an equilibrium change gives two roots. How is the unwanted one recoPCl5 at 1.00 M decomposes to PCl3 and Cl2 with Kc = 0.0211. What is [PCl5] at equilibrium?For N2 + O2 forming 2NO, Kc = 4.1 x 10^-4 with [N2] = 0.036 M and [O2] = 0.0089 M. What is