IGCSE Reversible reactions

What type of reactions are able to change products back to their original reactants?

• Reversible reactions

• Irreversible reactions

• Combustion reactions

• Combination reactions

Which of the following changes is an irreversible change?

• Melting of ice cube

• Heating hydrated CuSO₄

• Frying an egg

• Thermal decomposing NH₄Cl

Which of the following combination is correct?

• reversible ⇌

  irreversible →

• reversible ←

  irreversible →

• reversible ⇌

  irreversible ←

• irreversible ⇌

  reversible →

Tags

NGSS.HS-PS1-6

If a reversible reaction is exothermic in the forward direction, it will be ...

• exothermic in the reverse direction

• endothermic in the forward direction too

• endothermic in the reverse direction

• not involve energy in reverse direction

Tags

NGSS.HS-PS1-4

What is the symbol which is used in reversible reactions?

• →

• Δ

• +

• ⇌

Why might a reaction described as irreversible?

• The products cannot be turned back into the reactants.

• You need to apply heat to make the reaction work.

• The products can be turned back into the reactants.

• The reactants cannot be turned into the products.

Which of the following chemical reactions is reversible?

• CH₄ + 2O₂ → CO₂ + 2H₂O

• CuSO₄.5H₂O → CuSO₄ + 5H₂O

• NH₄Cl ⇌ NH₃ + HCl

• CaCO₃ → CaO +CO₂

Which of the following reactions is irreversible?

• Thermal decomposition of ammonium chloride.

• Heating hydrated copper sulfate.

• Combustion of ethanol.

Which of the following reactions never goes completion in a closed container?

• H_{2 +} I₂ ⇌ 2HI

• C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O

• NaOH + HCl → NaCl + H₂O

• CuSO₄ + Zn → ZnSO₄ + Cu

This symbol indicates that a reaction is ____________

• reversible
• irreversible