ESAT ESAT Chemistry 2

Question 1

What does Le Chatelier's Principle state in chemical equilibrium?

Accepted Answer

A system at equilibrium will shift to oppose any imposed change

Answer

Le Chatelier's Principle states that a system at equilibrium responds to a stress by shifting to minimise that stress.

Question 2

In ESAT Chemistry, what is the first ionisation energy?

Accepted Answer

Energy to remove one electron from a gaseous atom

Answer

First ionisation energy is the energy needed to remove one mole of electrons from one mole of gaseous atoms.

Question 3

What shape does a molecule with 4 bonding pairs and no lone pairs adopt?

Accepted Answer

Tetrahedral

Answer

VSEPR theory predicts a tetrahedral geometry for 4 bonding pairs with no lone pairs (e.g., CH₄).

Question 4

Which functional group characterises an alcohol?

Accepted Answer

-OH (hydroxyl)

Answer

Alcohols contain the -OH (hydroxyl) functional group attached to a carbon atom.

Question 5

What is Avogadro's constant?

Accepted Answer

6.022 × 10²³ mol⁻¹

Answer

Avogadro's constant is 6.022 × 10²³ mol⁻¹, the number of particles in one mole.

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