SC12 - Reversible Reactions and Equilibria ✓ Flashcards Preview

Edexcel GCSE Chemistry COPY > SC12 - Reversible Reactions and Equilibria ✓ > Flashcards

Flashcards in SC12 - Reversible Reactions and Equilibria ✓ Deck (8)
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SC12a - What is a reversible reaction?

A reaction where the products can react again to reform the reactants


SC12a - What symbol would show that a reaction is reversible?

⇌ : The double arrow


SC12a - In a reversible reaction how does the speed of the forward reaction and backward reaction change over time?

  • The forward reaction starts fast and gets slower over time.
  • The backward reaction starts slow and gets faster over time.


SC12a - Define Dynamic Equilibrium

When the forward and backward reactions in reversible reaction occur at the same rate.


SC12a - What happens to the amount of products and reactants produced once a reaction has reached Dynamic Equilibrium?

They stop changing (increasing or decreasing)


SC12a - What is required for Dynamic Equilibrium to be achieved, and why?

  • A closed system.
  • In an open system fluids can escape and equilibrium cannot be reached


SC12a - What is the name and the chemical formula of the process that creates ammonia?

  • The Harber Process:
  • N2(g) + 3H2(g) ⇌ 2NH3(g)


SC12a - What is the temperature, pressure and catalyst used during the Harber Process?

  • T: 450°
  • P: 200 Atmospheres (atm)
  • C: Iron Catalyst