According to the "arrow and rate" dynamic model, if the arrow representing the forward reaction is significantly longer than the arrow for the reverse reaction, what can be concluded about the state of the system?

The system has reached dynamic equilibrium

The system has reached completion and all reactants are gone

The system is currently producing more product than it is consuming

The reverse reaction has completely stopped

Question

Which of the following gas-phase equilibrium systems will experience NO change in the position of equilibrium when the total pressure of the system is increased?

How does the rate of the reverse reaction change during the initial stages of a reversible reaction when only reactants are present?

In a reversible reaction starting with only reactants, as the system approaches equilibrium, the rate of the forward reaction __________ while the rate of the reverse reaction increases.

The Haber process uses a 'compromise' temperature. If the forward reaction is exothermic, according to Le Chatelier's Principle, using a __________ temperature would actually result in a higher percentage yield of ammonia, even though it would be too slow for industrial use.

MYP MYP Chemistry Topic Reversible Reactions Questionbank

Practice MYP MYP Chemistry Topic Reversible Reactions with authentic exam-style questions for both SL and HL students. This question bank focuses on the exact syllabus content for Reversible Reactions and mirrors Paper 1, 2 style where relevant.

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$\mathrm{PCl}_5(\mathrm{g}) \rightleftharpoons \mathrm{PCl}_3(\mathrm{g}) + \mathrm{Cl}_2(\mathrm{g})$

$\mathrm{H}_2(\mathrm{g}) + \mathrm{I}_2(\mathrm{g}) \rightleftharpoons 2 \mathrm{HI}(\mathrm{g})$

$\mathrm{N}_2(\mathrm{g}) + 3 \mathrm{H}_2(\mathrm{g}) \rightleftharpoons 2 \mathrm{NH}_3(\mathrm{g})$

$2 \mathrm{CO}(\mathrm{g}) + \mathrm{O}_2(\mathrm{g}) \rightleftharpoons 2 \mathrm{CO}_2(\mathrm{g})$

It increases from zero as products are formed

It decreases as reactants are used up

It is initially higher than the forward rate

It remains constant until equilibrium is reached

decreases

remains constant

stops

increases

variable

lower

higher

fluctuating