Ionisation Energies (OCR A-Level Chemistry A): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What is first ionisation energy?
What is first ionisation energy?
Energy to remove 1e⁻ from 1 mol gaseous atoms
Why are all ionisation energies positive?
Why are all ionisation energies positive?
Ionisation is endothermic - energy supplied
How does increasing atomic radius affect ionisation energy?
How does increasing atomic radius affect ionisation energy?
Decreases it - greater distance weakens pull
Why do successive ionisation energies always increase?
Why do successive ionisation energies always increase?
Less e⁻-e⁻ repulsion; stronger nuclear pull
What does a large jump in successive ionisation energies indicate?
What does a large jump in successive ionisation energies indicate?
Electron removed from inner, closer shell
What is the trend in first ionisation energy down a group?
What is the trend in first ionisation energy down a group?
Decreases - radius & shielding increase most
What is the trend in first ionisation energy across a period?
What is the trend in first ionisation energy across a period?
Generally increases - more protons, same shell
Why does first ionisation energy drop from Be to B?
Why does first ionisation energy drop from Be to B?
2p e⁻ in B is higher energy than 2s in Be
Why does first ionisation energy drop from N to O?
Why does first ionisation energy drop from N to O?
Paired e⁻ in O repel, easier to remove one
Which electron is removed in first ionisation?
Which electron is removed in first ionisation?
One from highest energy level (outer shell)